MXZ-8B140VA MXZ-8B160VA MXZ-8B140YA MXZ-8B160YA

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1 SPLIT-TYPE, HEAT PUMP AIR DITIERS March 24 No. OH48 REVISED EDITI-D TEHNIAL & SERVIE MANUAL HF utilized R4A <Outdoor unit> [Model Name] MXZ-8B4VA MXZ-8B6VA MXZ-8B4YA MXZ-8B6YA [Service Ref.] MXZ-8B4VA MXZ-8B6VA MXZ-8B4YA MXZ-8B6YA Revision: Added connectable indoor unit MFZ-KJ25VE, MFZ-KJ35VE, and MFZ-KJ5VE in REVISED EDITI-D. Some descriptions have been modified. Please void OH48 REVISED EDITI-. NOTE: This service manual describes technical data of outdoor unit. As for indoor units and branch box (OH58), refer to its service manual. RoHS compliant products have <G> mark on the spec name plate. OUTDOOR UNIT Model name indication TENTS. SAFETY PREAUTI 2 2. OVERVIEW OF UNITS 5 3. SPEIFIATIS 2 4. DATA 3 5. OUTLINES AND DIMENSIS 7 6. WIRING DIAGRAM 8 7. NEESSARY DITIS FOR SYSTEM STRUTI 2 8. TROUBLESHOOTING ELETRIAL WIRING 56. WIRING SPEIFIATIS. 58. SYSTEM TROL REFRIGERANT PIPING TASK 6 3. DISASSEMBLY PROEDURE 64 INDOOR UNITS OMBINATI SHEETS PARTS ATALOG (OB48)

2 SAFETY PREAUTI -. ALWAYS OBSERVE FOR SAFETY Before obtaining access to terminal, all supply circuit must be disconnected. -2. AUTIS RELATED TO NEW REFRIGERANT autions for units utilizing refrigerant R4A Use new refrigerant pipes. Make sure that the inside and outside of refrigerant piping is clean and it has no contaminants such as sulfur, oxides, dirt, shaving particles, etc, which are hazard to refrigerant cycle. In addition, use pipes with specified thickness. ontamination inside refrigerant piping can cause deterioration of refrigerant oil etc. Store the piping indoors, and both ends of the piping sealed until just before brazing. (Leave elbow joints, etc. in their packaging.) If dirt, dust or moisture enters into refrigerant cycle, that can cause deterioration of refrigerant oil or malfunction of compressor. The refrigerant oil applied to flare and flange connections must be ester oil, ether oil or alkylbenzene oil in a smalll amount. If large amount of mineral oil enters, that can cause deterioration of refrigerant oil etc. harge refrigerant from liquid phase of gas cylinder. If the refrigerant is charged from gas phase, composition change may occur in refrigerant and the efficiency will be lowered. Do not use refrigerant other than R4A. If other refrigerant (R22 etc.) is used, chlorine in refrigerant can cause deterioration of refrigerant oil etc. Use a vacuum pump with a reverse flow check valve. Vacuum pump oil may flow back into refrigerant cycle and that can cause deterioration of refrigerant oil etc. Use the following tools specifically designed for use with R4A refrigerant. The following tools are necessary to use R4A refrigerant. Tools for R4A Gauge manifold Flare tool harge hose Size adjustment gauge Gas leak detector Torque wrench Handle tools with care. If dirt, dust or moisture enters into refrigerant cycle, that can cause deterioration of refrigerant oil or malfunction of compressor. Do not use a charging cylinder. Vacuum pump adaptor Electronic refrigerant charging scale If a charging cylinder is used, the composition of refrigerant will change and the efficiency will be lowered. Use the specified refrigerant only. Never use any refrigerant other than that specified. Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of. orrect refrigerant is specified in the manuals and on the spec labels provided with our products. We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to follow the instructions. Ventilate the room if refrigerant leaks during operation. If refrigerant comes into contact with a flame, poisonous gases will be released. OH48D 2

3 [] autions for service () Perform service after recovering the refrigerant left in unit completely. (2) Do not release refrigerant in the air. (3) After completing service, charge the cycle with specified amount of refrigerant. (4) When performing service, install a filter drier simultaneously. Be sure to use a filter drier for new refrigerant. [2] Additional refrigerant charge When charging directly from cylinder heck that cylinder for R4A on the market is syphon type. harging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.) Unit Gravimeter [3] Service tools () Use the below service tools as exclusive tools for R4A refrigerant. No. Tool name Specifications Gauge manifold Only for R4A Use the existing fitting specifications. (UNF/2) Use high-tension side pressure of 5.3MPa G or over. 2 harge hose Only for R4A Use pressure performance of 5.9MPa G or over. 3 Electronic scale 4 Gas leak detector Use the detector for R34a, R47 or R4A. 5 Adaptor for reverse flow check Attach on vacuum pump. 6 Refrigerant charge base 7 Refrigerant cylinder Only for R4A Top of cylinder (Pink) ylinder with syphon 8 Refrigerant recovery equipment OH48D 3

4 (2) autions for refrigerant piping work New refrigerant R4A is adopted for replacement inverter series. Although the refrigerant piping work for R4A is same as for R22, exclusive tools are necessary so as not to mix with different kind of refrigerant. Furthermore as the working pressure of R4A is.6 times higher than that of R22, their sizes of flared sections and flare nuts are different. Thickness of pipes Because the working pressure of R4A is higher compared to R22, be sure to use refrigerant piping with thickness shown below. (Never use pipes of.7 mm or below.) Diagram below: Piping diameter and thickness Nominal dimensions(inch) /4 3/8 /2 5/8 3/4 Outside diameter (mm) R4A Thickness (mm) R Dimensions of flare cutting and flare nut The component molecules in HF refrigerant are smaller compared to conventional refrigerants. In addition to that, R4A is a refrigerant, which has higher risk of leakage because of its working pressure higher than that of other refrigerants. Therefore, to enhance airtightness and intensity, flare cutting dimension of copper pipe for R4A has been specified separately from the dimensions for other refrigerants as shown below. The dimension B of flare nut for R4A also has partly been changed to increase intensity as shown below. Set copper pipe correctly referring to copper pipe flaring dimensions for R4A below. For /2 and 5/8, the dimension B changes. Use torque wrench corresponding to each dimension. Dimension A Dimension B Flare cutting dimensions Nominal Outside dimensions (inch) diameter (mm) / / / / / Dimension A ( ) R4A (mm) R Flare nut dimensions Nominal dimensions (inch) /4 3/8 /2 5/8 3/4 Outside (mm) diameter Dimension B (mm) R4A R Tools for R4A (The following table shows whether conventional tools can be used or not.) Tools and materials Use R4A tools an R22 tools be used? Gauge manifold Air purge, refrigerant charge harge hose and operation check Gas leak detector Gas leak check Refrigerant recovery equipment Refrigerant recovery Refrigerant cylinder Refrigerant charge Applied oil Apply to flared section Safety charger harge valve Vacuum pump Flare tool Bender Pipe cutter Welder and nitrogen gas cylinder Refrigerant charging scale Vacuum gauge or thermistor vacuum gauge and vacuum valve harging cylinder Prevent compressor malfunction when charging refrigerant by spraying liquid refrigerant Prevent gas from blowing out when detaching charge hose Vacuum drying and air purge Flaring work of piping Bend the pipes ut the pipes Weld the pipes Refrigerant charge heck the degree of vacuum. (Vacuum valve prevents back flow of oil and refrigerant to thermistor vacuum gauge) Refrigerant charge Tool exclusive for R4A Tool exclusive for R4A Tool for HF refrigerant Tool exclusive for R4A Tool exclusive for R4A Ester oil and alkylbenzene oil (minimum amount) Tool exclusive for R4A Tool exclusive for R4A Tools for other refrigerants can be used if equipped with adapter for reverse flow check Tools for other refrigerants can be used by adjusting flaring dimension Tools for other refrigerants can be used Tools for other refrigerants can be used Tools for other refrigerants can be used Tools for other refrigerants can be used Tools for other refrigerants can be used Tool exclusive for R4A : Prepare a new tool. (Use the new tool as the tool exclusive for R4A.) : Tools for other refrigerants can be used under certain conditions. : Tools for other refrigerants can be used. (Usable if equipped with adapter for reverse flow) (Usable by adjusting flaring dimension) an R47 tools be used? Ester oil: Alkylbenzene oil: minimum amount (Usable if equipped with adapter for reverse flow) (Usable by adjusting flaring dimension) OH48D 4

5 2 OVERVIEW OF UNITS 2-. STRUTI OF SYSTEM Outdoor unit Indoor unit that can be connected Branch box that can be connected Rated capacity (kw) Refrigerant apacity ooling Heating Number of units Total system wide capacity Number of units MXZ-8B4VA/6VA MXZ-8B4YA/6YA 5HP 6HP R4A Type 5 ~ Type AUTI : The indoor unit which rated capability exceeds.kw ( type) can NOT be connected. 2 ~ 8 units 2 ~ 32 % of outdoor unit capacity (3. kw ~ 8.5 kw) 9 ~ 3 % of outdoor unit capacity (3. kw ~ 2.2 kw) ~ 2 units onnectable indoor unit lineup (Heat pump inverter type) Wall mounted eiling concealed Model type Deluxe Standard ompact Low static pressure Middle static pressure High static pressure 2 by 2 type 4-way Standard ceiling cassette Floor standing -way ceiling cassette Model name MSZ-FA25/35VA MSZ-FB25/35/5VA(H) MSZ-FD25/35/5VA MSZ-FH25/35/5VE MSZ-GA22/25/35/5/6/7/8VA MSZ-GB5VA MSZ-G22/25/35VA MSZ-G22/25/35/5/6/7NA MSZ-GE22/25/35/42/5/6/7/8VA MSZ-SF25/35/42/5VE MSZ-GE22/25/35/42/5/6/7NA MSZ-GF6/7VE MSZ-EF8/22/25/35/42/5VE MSZ-SF5/2VA SEZ-KA/K25/35/5/6/7VA SEZ-KD25/35/5/6/7VA(L) PEAD-RP5/6/7/JA(L)Q.UK PEA-RP7EA/RPEA2 MFZ-GA35/5/6VA SLZ-KA25/35/5VA(L) PLA-RP35/5/6/7AA(.UK)/BA(.UK) PLA-RP7BA2.UK PLA-RPBA/BA3 MFZ-KA25/35/5VA MFZ-KJ25/35/5VE MLZ-KA25/35/5VA apacity class (kw) * <NOTE> The lineup of a connectable indoor unit depends on a district/areas/country. * When connectiing the indoor unit with the number, use the PA-AK52YP-E Y-shape connection pipe (Optional part). Branch box PA-AK53B Number of branches 5 branches Indoor unit that (MAX. 5 units) ( can be connected) Max. 2 branch boxes can be connected to outdoor unit. PA-AK32B 3 branches (MAX. 3 units) 2- branch pipe (joint) : Optional parts In case of using - branch box In case of using 2- branch boxes No need Model name onnection method MSDD-5AR-E flare MSDD-5BR-E brazing According to the connection method, you can choose the favorite one. Option OH48D Optional accessories of indoor units and outdoor units are available. 5

6 2-2. SYSTEM OUTLINE The additional connection of the Branch Box together with employment of the compact trunk-looking outdoor unit can successfully realizes a long distance piping for big houses. Equipped with a microprocessor, the Branch Box can translate the transmission signal of indoor units to achieve the optimum control System example Indoor unit (eiling concealed type) Indoor unit (Wall mounted type) Outdoor unit Branch Box Method for identifying Outdoor unit Number of connectable indoor units (MAX.) Model type M X Z 8 B 4 V A ontrol and refrigerant A : New A control and R4A Power supply V: Single phase 22/23/24V 5Hz Y: 3-Phase 38/4/45V 5Hz Multi type heat pump inverter outdoor unit Indicates equivalent to rated cooling capacity. (O.kW) Branch box Applicable refrigerant A : R4A Symbol of factory P A A K 5 3 B (Indispensable) Optional parts OH48D Branch box (ontroller) Model type Number of branches 5 : 5 branches 3 : 3 branches 6

7 2-3. TYPIAL OMBINATI EXAMPLE Branch box is located INSIDE of condominium Branch box (Inside) Installing branch box indoors Only piping is required between the outdoor and indoor offering a fine external view. System example of 5 indoor units Branch box (5 branch type) Master bedroom Living Outdoor unit SEZ-6 Dining MSZ-35 Bedroom () MSZ-35 Bedroom (2) MSZ-25 MSZ-25 Verification The rated capacity should be determined by observing the table below. The unit s quantities are limited in 2 to 8 units. For the next step, make sure that the selected total rated capacity is in a range as shown below. The total indoor unit capacity should be within the outdoor units. ombination of excessive indoor units and an outdoor unit may reduce the capacity of each indoor unit. The rated indoor capacity is as the table below. MXZ-8B4 3. ~ 8.5 kw MXZ-8B6 3. ~ 2.2 kw Example: MXZ-8B4 SEZ-6 MSZ-35 MSZ-35 MSZ-25 MSZ-25 = 6. + = = = = 2.5 Indoor unit type (capacity class) Rated capacity (cooling) (kw) OH48D Total rated capacity kW

8 2-4. INSTALLATI Outdoor unit installation location For best performance, select proper position. Avoid places where combustible gas may be generated or leak. Avoid direct sunlight or other sources of heat. Install sunshade to protect the outdoor unit if direct sunlight hits the unit. Install the outdoor unit with enough distance between neighbours as operation noise may disturb the neighbours. Avoid the position that the unit is covered by snow or snow blows directly against the air outlet. The snow block or blow will reduce the airflow of the outdoor unit. In the areas of heavy snow, special countermeasures must be taken at installation to protect the outdoor unit from malfunction caused by snow. Select a location permitting easy wiring and pipe access to the power source and indoor unit. Drain water must be drained freely during operation. heck for draining Ventilation and service space () Windy location installation When installing the outdoor unit on a rooftop or other location unprotected from the wind, situate the air outlet of the unit so that it is not directly exposed to strong winds. Strong wind entering the air outlet may impede the normal airflow and a malfunction may result. The following shows 3 examples of precautions against strong winds. Face the air outlet towards the nearest available wall about 5 cm away from the wall. (Fig. 2-) Install an optional air guide if the unit is installed in a location where strong winds from a typhoon, etc. may directly enter the air outlet. (Fig. 2-2) A Air guide Position the unit so that the air outlet blows perpendicularly to the seasonal wind direction, if possible. (Fig. 2-3) B Wind direction Fig. 2- Fig. 2-2 Fig. 2-3 OH48D 8

9 (2) When installing a single outdoor unit Minimum dimensions are as follows, except for Max., meaning Maximum dimensions, indicated. Refer to the figures for each case. Obstacles at rear only (Fig. 2-4) Obstacles at rear and above only (Fig. 2-5) Do not install the optional air outlet guides for upward airflow. Obstacles at rear and sides only (Fig. 2-6) Obstacles at front only (Fig. 2-7) * When using an optional air outlet guide, the clearance is 5 mm or more. Obstacles at front and rear only (Fig. 2-8) * When using an optional air outlet guide, the clearance is 5 mm or more. Obstacles at rear, sides, and above only (Fig. 2-9) Do not install the optional air outlet guides for upward airflow. Max. 5 unit : mm Fig Fig. 2-5 Fig Max Fig. 2-7 Fig. 2-8 Fig. 2-9 OH48D 9

10 (3) When installing multiple outdoor units Leave mm space or more between the units. Obstacles at rear only (Fig. 2-) Obstacles at rear and above only (Fig. 2-) No more than 3 units must be installed side by side. In addition, leave space as shown. Do not install the optional air outlet guides for upward airflow. Obstacles at front only (Fig. 2-2) * When using an optional air outlet guide, the clearance is mm or more. Obstacles at front and rear only (Fig. 2-3) * When using an optional air outlet guide, the clearance is 5 mm or more. Single parallel unit arrangement (Fig. 2-4) * When using an optional air outlet guide installed for upward airflow, the clearance is mm or more. Multiple parallel unit arrangement (Fig. 2-5) * When using an optional air outlet guide installed for upward airflow, the clearance is 5 mm or more. Stacked unit arrangement (Fig. 2-6) The units can be stacked up to 2 units high. No more than 2 stacked units must be installed side by side. In addition, leave space as shown. Max. 3 5 unit : mm 5 Fig. 2-3 Fig. 2-5 Fig Fig Fig Fig Fig OH48D

11 2-5. SIMPLIFIED PIPING SYSTEM Piping connection size A B Liquid Gas (mm) (mm) {9.52 {5.88 The piping connection size differs according to the type and capacity of indoor units. Match the piping connection size of branch box with indoor unit. If the piping connection size of branch box does not match the piping connection size of indoor unit, use optional different-diameter (deformed) joints to the branch box side. (onnect deformed joint directly to the branch box side.) For P indoor units, the individual Y-shape connection pipes use 2 ports on the branch box as shown below. Branch box Port A Port B Port Port D Port E a a Y-shape connection pipe b Indoor unit (P) Branch box Port A Port B Port Port D Port E a a a a Y-shape connection pipe b Y-shape connection pipe b Indoor unit (P) Indoor unit (P) To connect a single P indoor unit, use port A and port B on the branch box. To connect two P indoor units, use port A and port B, and port and port D on the branch box. Flare connection employed. (No brazing!) In case of using -branch box Flare connection employed (No brazing) A Branch box B B B B B In case of using 2-branch boxes 2 branches pipe (joint) : optional parts A A Branch box # A B B B B B Branch box #2 Installation procedure (2 branch pipe (joint)) Refer to the installation manuals of MSDD-5AR-E and MSDD-5BR-E. OH48D

12 3 SPEIFIATIS MXZ-8B4VA MXZ-8B4YA MXZ-8B6VA MXZ-8B6YA Service Ref. Rated ooling capacity Rated power consumption * Operating current * Operating power factor * Starting current (Outdoor unit) Rated Heating capacity Rated power consumption * Operating current * Operating power factor * Starting current (Outdoor unit) Breaker Max. current (Outdoor unit only) Standard performance OUTDOOR UNIT REFRIGERANT PIPING Heating ooling Power supply (phase, cycle, voltage) External finish Refrigerant control ompressor Model Motor output Starter type Protection devices rankcase heater Heat exchanger Fan Defrost method Noise level Dimensions Fan (drive) o No. Fan motor output Airflow Weight Refrigerant harge Oil (Model) Pipe size O.D. onnection method ooling Heating W D H Liquid Gas Indoor side Outdoor side kw W kw K/min (FM) db db mm (in.) mm (in.) mm (in.) kg (lbs) kg (lbs) L mm mm * Electrical data is only for outdoor unit. onversion formula [6.35mm [9.52mm [2.7mm [5.88mm /4 inch 3/8 inch /2 inch 5/8 inch Notes. Rating onditions (ISO T) ooling : Indoor : D.B. 27 (8 F), W.B. 9 (66 F) Outdoor : D.B. 35 (95 F), W.B. 24 (75 F) Heating : Indoor : D.B. 2 (68 F) Outdoor : D.B. 7 (45 F), W.B. 6 (43 F) Refrigerant piping length (one way) : Main Piping (From outdoor unit to branch box) : 5m Branch Piping (From branch box to each indoor units) : each 3m 2. Guaranteed operating range ooling Heating Upper limit Lower limit Upper limit Lower limit P-series D.B. 35, W.B D.B. 9, W.B. 5 D.B. 28 D.B Guaranteed voltage MXZ-8B4/6VA: 98~264V, 5Hz MXZ-8B4/6YA: 342~456V, 5Hz kw kw A % A kw kw A % A [9.5mm 3/4 inch Indoor 4. Above data are based on the indicated voltage. MXZ-8B4/6VA: Single, 5Hz, 22/23/24V MXZ-8B4/6YA: 3-phase, 5Hz, 38/4/45V kcal/h = kw o 86 onversion formula: Btu/h = kw o 342 FM = m 3 /min o 35.3 MXZ-8B4VA MXZ-8B6VA MXZ-8B4YA MXZ-8B6YA /6.85/ /2.69/ /5.63/ /6.87/ /6.9/ /2.95/ /5.65/ /6.95/ Please refer to "9.ELETRIAL WIRING" Single, 5Hz, 22/23/24V 3-phase, 5Hz, 38/4/45V Munsall 3Y 7.8/. Linear Expansion Valve (In branch box) Hermetic ANB33FDSMT ANB33FNBMT Line start HP switch, LP switch, Discharge thermo - Plate fin coil Propeller fan (3,53) 6(3,742) (3,53) 6(3,742) Reverse cycle (37-3/8) 33+3(3+-3/6),35(53-/8) 29(284) 39(36) R4A 8.5(8.7),4m 2.3(FV5S) [9.52 [5.88 Flared Flared M-series, S-series D.B. 32, W.B. 23 D.B. 2, W.B. 5 D.B. 27 D.B Refer to the service manual of indoor unit for the indoor unit's specifications. A Outdoor D.B. 46 D.B. 5 D.B. 2, W.B. 5 D.B. 5, W.B. 5 OH48D 2

13 4 DATA 4-. OOLING AND HEATING APAITY AND HARATERISTIS 4--. Method for obtaining system cooling and heating capacity: To obtain the system cooling and heating capacity and the electrical characteristics of the outdoor unit, first add up the ratings of all the indoor units connected to the outdoor unit (see table below), and then use this total to find the standard capacity with the help of the tables at the back of the manual "INDOOR UNITS OMBINATI SHEETS". () apacity of indoor unit Model number for indoor unit Model 5 Model 8 Model 2 Model 22 Model 25 Model capacity Model 35 Model 42 Model 5 Model 6 Model 7 Model 8 Model (2) Sample calculation System assembled from indoor and outdoor unit (in this example the total capacity of the indoor units is greater than that of the outdoor unit) Outdoor unit MXZ-8B4VA Indoor unit MSZ-EF25VE o 2, PEAD-RP5JAQ o 2 2 According to the conditions in, the total capacity of the indoor unit will be: 2.5 o o 2 = 5. 3The following figures are obtained from the 5 total capacity row of the standard capacity diagram (INDOOR UNITS OMBINATI SHEETS: at the back of the manual). apacity (kw) Outdoor unit power consumption (kw) Outdoor unit current (A)/23V ooling Heating ooling Heating ooling Heating A 4. B Method for obtaining the heating and cooling capacity of an indoor unit: () The capacity of each indoor unit (kw) = the capacity A (or B) o (2) Sample calculation (using the system described above in 4--. (2) ): model capacity total model capacity of all indoor units During cooling: The total model capacity of the indoor unit is: 2.5 o o 2=5.kW Therefore, the capacity of MSZ-EF25VE and PEAD-RP5JAQ will be calculated as follows by using the formula in (): Model 25=4. o Model 5=4. o = 2.33kW = 4.67kW During heating: The total model capacity of indoor unit is: 2.5 o o 2=5. Therefore, the capacity of MSZ-EF25VE and PEAD- RP5JAQ will be calculated as follows by using the formula in (): Model 25=6. o Model 5=6. o = 2.67kW = 5.33kW OH48D 3

14 4-2. ORRETING OOLING AND HEATING APAITY orrecting hanges in Air onditions () The performance curve charts (Figure 4-, 4-2, 4-3, 4-4) show the change ratio of capacity and input (power consumption) according to the indoor and outdoor temperature condition when define the rated capacity (total capacity) and rated input under the standard condition in standard piping length (5 m) as.. Standard conditions: Indoor D.B. 27 / W.B. 9 Rated cooling capacity Outdoor D.B. 35 Indoor D.B. 2 Rated heating capacity Outdoor D.B. 7 / W.B. 6 Use the rated capacity and rated power values given in the characteristics table for each indoor unit. The capacity is the single value on the side of the outdoor unit; The capacity on the sides of each indoor unit must be added to obtain the total capacity. (2) The capacity of each indoor unit may be obtained by multiplying the total capacity obtained in () by the ratio between the individual capacity at the rated time and the total capacity at the rated time. Individual capacity under stated conditions =Total capacity under the stated conditions o Individual capacity at the rated time Total capacity at the rated time Fig. 4- ooling capacity Fig. 4-2 ooling input ooling input ratio ooling capacity ratio (3) apacity correction factor curve.8.6 Indoor intake air wet-bulb temperature <:W.B.> Indoor intake air wet-bulb temperature <:W.B.> Fig. 4-4 Heating input Indoor intake air dry-bulb temperature <:D.B.> Indoor intake air dry-bulb temperature <:D.B.> Outdoor intake air wet-bulb temperature <:W.B.> Outdoor intake air wet-bulb temperature <:W.B.> Note : These diagrams show the case where the operation frequency of a compressor is fixed. OH48D 2 Outdoor intake air dry-bulb temperature <:D.B. > Outdoor intake air dry-bulb temperature <:D.B. > Fig. 4-3 Heating capacity

15 orrecting apacity for hanges in the Length of Refrigerant Piping To obtain the ratio (and the corrected piping length) of the outdoor units rated capacity and the total in-use indoor capacity, first find the capacity ratio corresponding to the standard piping length from Fig. 4-5, Fig. 4-6 and then multiply by the capacity from Fig. 4-, 4-2, Fig. 4-3, 4-4 to obtain the actual capacity. () apacity correction factor Fig. 4-5 ooling capacity correction curve MXZ-8B4VA, MXZ-8B4YA MXZ-8B6VA, MXZ-8B6YA ooling apacity (ratio) [%] Total rated capacity of indoor units (kw) 2.2 (5.7%) 7. (5%).5 (75%) 4. (%) 8.5 (32%) ooling apacity (ratio) [%] Total rated capacity of indoor units (kw) 2.5(6%) 7.8 (5%).6 (75%) 5.5 (%) 2.2 (3%) orrected piping length (m) orrected piping length (m) Fig. 4-6 Heating capacity correction curve MXZ-8B4VA, MXZ-8B4YA, MXZ-8B6VA, MXZ-8B6YA Heating apacity (ratio) [%] orrected piping length (m) (2) Method for Obtaining the orrected Piping Length orrected piping length = (Actual piping length between outdoor unit and the farthest indoor unit) + (.3 o number of bends in the piping) (m) OH48D 5

16 4-3. NOISE RITERI URVES MIROPHE m UNIT.5m GROUND MXZ-8B4VA MXZ-8B4YA MODE SPL(dB) OOLING 5 HEATING 52 LINE MXZ-8B6VA MXZ-8B6YA MODE SPL(dB) OOLING 5 HEATING 54 LINE 9 9 OTAVE BAND SOUND PRESSURE LEVEL, db ( db =.2 µbar) APPROXIMATE THRESHOLD OF HEARING FOR TINUOUS NOISE BAND ENTER FREQUENIES, Hz N-7 N-6 N-5 N-4 N-3 N-2 OTAVE BAND SOUND PRESSURE LEVEL, db ( db =.2 µbar) APPROXIMATE THRESHOLD OF HEARING FOR TINUOUS NOISE BAND ENTER FREQUENIES, Hz N-7 N-6 N-5 N-4 N-3 N-2 OH48D 6

17 5 OUTLINES AND DIMENSIS MXZ-8B4VA MXZ-8B4YA MXZ-8B6VA MXZ-8B6YA 2 SERVIE SPAE FREE SPAE (Around the unit) Dimensions of space needed for service access are shown in the below diagram. FREE 5 Over The diagram below shows a basic example. Explanation of particular details are given in the installation manuals etc. unit : mm 3 FOUNDATI BOLTS 4 PIPING-WIRING DIRETIS Please secure the unit firmly with 4 foundation (M) bolts. (Bolts and washers must be purchased locally.) Piping and wiring connections can be made from 4 directions: front, right, rear and below. Over Service space Over Over FOUNDATI 3 5 Over Over Less than <Foundation bolt height> Over 5 Over 5 Rear Air Intake 75 Refrigerant GAS pipe connection (FLARE)[5.88(5/8 inch) 2 Refrigerant LIQUID pipe connection (FLARE)[9.52(3/8 inch) Indication of STOP VALVE connection location Rear Air Intake Handle for moving Side Air Intake Oval holes (Foundation Bolt M) 7 Air Discharge MXZ-8B4YA/6YA 37 Side Air Intake A MXZ-8B4VA/6VA 2-U Shaped notched holes (Foundation Bolt M) MODEL 6 Installation Feet 9 Example of Notes 322 ( Earth terminal Terminal connection Left Power supply wiring Right Indoor/Outdoor wiring ) Service panel 35 Handle for moving Handle for moving 635 Handle for moving A Handle for moving Air Intake 23 Front piping cover Rear piping cover Bottom piping hole (Knock-Out) [ Power supply wiring hole (2-[27Knockout) Rear trunking hole (Knockout) OH48D Rear piping hole (Knockout) 33) 65 [ [ ole( Front piping hole (Knockout) 75 3 Right trunking hole (Knockout) 45 4 in h [92 Power supply wiring hole (2-[27Knockout) Right piping hole (Knockout) Dra Power supply wiring hole (2-[27Knockout) Front trunking hole 4 45 (Knockout) 8 Piping Knockout Hole Details

18 6 WIRING DIAGRAM MXZ-8B4VA MXZ-8B6VA SYMBOL NAME TB Terminal Block <Power Supply, Branch Box> M Motor for ompressor MF, MF2 Fan Motors 2S4 Solenoid Valve <Four-Way Valve> 63H High Pressure Switch 63L Low Pressure Switch 63HS High Pressure Sensor SV,SV2 Solenoid Valve <Bypass Valve> TH3 Thermistor <Outdoor Pipe> TH4 Thermistor <ompressor> TH6 Thermistor <Outdoor 2 - Phase Pipe> TH7 Thermistor <Outdoor> DL Reactor B Main Smoothing apacitor Y,Y2 apacitor P. B. Power ircuit Board U / V / W onnection Terminal <U / V / W - Phase> LI / NI onnection Terminal <L / N - Phase> P2,N2 onnection Terminal <B> DL,DL2 onnection Terminal <DL> IGBT Power Module EI,E2,E3,E4 onnection Terminal <Ground> Relay. B. ontroller ircuit Board SW Switch <Forced Defrost, Defect History Record Reset> SW2 Switch <Self Diagnosis Switch> SW4 Switch <Test Operation> SW5 Switch <Function Switch> SW6 Switch <Model Select> SW7 Switch <Function Setup> SW8 Switch <Function Setup> SW9 Switch <Function Setup> N3 onnector N5 onnector <onnection for Option> SS onnector <onnection for Option> N3S onnector <onnection for Option> NIT onnector <onnection for Option> NDM onnector <onnected for Option (ontact Input)> LED3 Light Emitting Diode <Operation Inspection Indicators> F ~ F4 Fuse <T6.3AL25V> X5,X52,X54,X55 Relay MF MS 3~ MF2 MS 3~. B. NS (WHT) 2 3 NF 7 (WHT) NF2 7 (WHT) 3 ND (PNK) B F2 F WHT RED TH7 TH6 TH3 TH TH7/6 TH3 TH4 (RED) (WHT) (WHT) TRANS t t t t NA (WHT) N4 (WHT) 63H 3 63H (YLW) N2 (WHT) 7 7 F3 F4 N2 (WHT) 7 63L 3 63L (RED) N2 P2 3 2S4 63HS 3 63HS (WHT) 2 X52 N4 (WHT) 2 2S4 3 (GRN) SV2 NM 4 (WHT) X55 5 NIT (RED) X54 SV2 3 SV (BLU) (GRY) 2 ND (PNK) 3 IGBT SV The black square ( ) indicates a switch position. w N52 (RED) SW8 SW5 SW4 X5 3 SS (WHT) LED3 SW6 SW N52 3 (RED) N3 SW2 SW9 SW7 N3S (WHT) NDM (WHT) N5 (WHT) E2 P. B. E3 NA2 (RED) 3 BLK BLK E4 3 NA (WHT) W V U DL2 DL EI NI LI * MODEL SELET The black square ( ) indicates a switch position. MODEL SW V OFF 6V OFF BLK WHT V W U MS 3~ M RED DL RED BLK BLU BLK GRN / YLW YLW ORN BRN Y Y2 L N S S2 S3 TB BRANH BOX Operation / Inspection Display LED on the controller board display the operation and inspection status as follows. If LED does not light, it indicates that no power is supplied to the board: Details Power turned on Normal status Faulty status (blinking) 63L connector (red) is open. 63H connector (yellow) is open. 2 connectors (63H/63L) are open. Branch box/outdoor communication error (Signal receiving error)(outdoor unit) Indoor/branch box communication error (Signal receiving error)(branch box) Branch box/outdoor communication error (Transmitting error)(outdoor unit) Indoor/branch box communication error (Transmitting error)(branch box) Mis-Wiring of indoor-branch box / branch box-outdoor unit connecting wire. Too many indoor units / branch box are in the system. Mis-wiring of indoor-branch box/branch box-outdoor unit connecting wire (converse wiring or disconnection) Startup time over ommunication error except for outdoor unit ombination errer, undefined error Serial communication error ode (blinks) Operation status display, such as 5. H7 F3 F5 F9 E8 E9 EA Eb Ec E - E7 EE, EF Ed POWER SUPPLY ~/N 22/23/24V 5HZ 22V 6HZ Details ompressor temperature fault Low-discharge superheating fault, Erroneous connection of refrigerant pipes or the connecting wires High pressure fault (63H operates) Low pressure fault (63L operates) Abnormality of power moduls ompressor over current shutoff (Start up locked) urrent sensor fault (P. B.) ompressor overcurrent shutoff fault ompressor thermistor (TH4) open or short-circuit Outdoor unit thermistors (TH3, TH6, TH7, and TH8), 63HS, and branch dox thermistors open or short-circuit Radiator panel temperature fault Abnormality in outdoor fan motor Voltage fault, current sensor fault Forced compressor stop (Overlap malfunction of drain pump in indoor unit and linear expansion valve in branch box) U2 U7 U UL U6 UF UH UP U3 U4 U5 U8 U9 PA ode autions when Servicing WARNING:When the main supply is turned off, the voltage[34 V]in the main capacitor will drop to 2 V in approx. 2 minutes (input voltage : 24 V). when servicing, make sure that LED on the outdoor circuit board goes out, and then wait for at least minute. omponents other than the outdoor board may be faulty : heck and take corrective action, referring to the service manual. Do not replace the outdoor board without checking. OH48D 8

19 MXZ-8B4YA MXZ-8B6YA SYMBOL NAME TB Terminal Block <Power Supply> TB2 Terminal Block <Branch Box> M Motor for ompressor MF, MF2 Fan Motors 2S4 Solenoid Valve <Four-Way Valve> 63H High Pressure Switch 63L Low Pressure Switch 63HS High Pressure Sensor SV,SV2 Solenoid Valve <Bypass Valve> TH3 Thermistor <Outdoor Pipe> TH4 Thermistor <ompressor> TH6 Thermistor <Outdoor 2 - Phase Pipe> TH7 Thermistor <Outdoor> AL~AL4 Reactor B, B2 Main Smoothing apacitor K apacitor RS Rush urrent Protect Resistor Y,Y2 apacitor P. B. Power ircuit Board TB-U/V/W onnection Terminal <U / V / W - Phase> TB-L/L2/L3 onnection Terminal <L/L2/L3-Power Supply> TB-P2 onnection Terminal TB- onnection Terminal TB-N onnection Terminal IGBT Power Module X52A 52 Relay N. F. Noise Filter ircuit Board LI/LI2/LI3/NI onnection Terminal <L/L2/L3/N-Power Supply> LO/LO2/LO3/NO onnection Terminal <L/L2/L3/N-Power Supply> GD, GD3 onnection Terminal <Ground> V.B. ontroller ircuit Board L-A / IN onnection Terminal <L-Power Supply> L-A2 / OU onnection Terminal <L-Power Supply> L2-A2 / OU onnection Terminal <L2-Power Supply> L3-A2 / OU onnection Terminal <L3-Power Supply> N-IN onnection Terminal <N-Power Supply> K-OU onnection Terminal <K>. B. ontroller ircuit Board SW Switch <Forced Defrost, Defect History Record Reset> SW2 Switch <Self Diagnosis Switch> SW4 Switch <Test Operation> SW5 Switch <Function Switch> SW6 Switch <Model Select> SW7 Switch <Function Setup> SW8 Switch <Function Setup> SW9 Switch <Function Setup> N3 onnector N5 onnector <onnection for Option> SS onnector <onnection for Option> N3S onnector <onnection for Option> NIT onnector <onnection for Option> NDM onnector <onnected for Option (ontact Input)> LED3 Light Emitting Diode <Operation Inspection Indicators> F ~ F4 Fuse <T6.3AL25V> X5,X52,X54,X55 Relay * MODEL SELET The black square ( ) indicates a switch position. MODEL SW Y OFF 6Y OFF BRANH BOX POWER SUPPLY 3N~ 38/4/45V 5HZ MF MS 3~ MF2 MS 3~ TB2 S S2 S3 Y. B. NS (WHT) Y2 3 BRN ORN NF 7 (WHT) NF2 7 (WHT) 3 TRANS 2 ND (PNK) YLW F2 F TB RED L WHT L2 L3 N BLK BLU GRN/YLW NA (WHT) 2 TH7 TH6 TH3 TH4 3 4 t t t t TH7/6 TH3 TH4 (RED) (WHT) (WHT) LI LI2 LI3 NI N. F. N2 (WHT) 7 F3 F4 2 2 RS BLK P. B. GD H 3 63H (YLW) 3 N7 (WHT) 2 N4 (WHT) 2 N5 (RED) RED RED 63L 3 63L (RED) 7 X52A NA (WHT) 3 3 2S4 N2 (WHT) 63HS 3 63HS (WHT) 2 RED X52 N4 (WHT) 2 2S4 3 (GRN) GD3 7 TB-P2 BLK SV2 WHT NM 4 (WHT) X55 SV2 (BLU) IGBT TB- ND (PNK) 5 NIT (RED) X54 3 SV (GRY) SV BLK TB-V TB-W TB-U TB-L3 TB-L2 TB-L B B2 K 2 The black square ( ) indicates a switch position. TB-N 2 SW8 SW5 SW4 X5 LED3 SW6 SW 3 SS (WHT) N3 SW2 SW9 SW7 N3S (WHT) NDM (WHT) N5 (WHT) 3 3 NT NA2 (RED) 2 3 (RED) LO RED 3 3 BRN NL (BLU) WHT 3 BLK WHT RED BLK WHT RED BLK w V U 3 5 W M MS 3~ N7 (WHT) LO2 WHT LO3 BLK NO L3-OU BLK L-A RED BLU L3-A2 WHT RED AL4 L2-OU WHT RED V. B. L-IN L2-A2 BLU N-IN L-OU RED BLK AL AL2 AL3 K-OU L-A2 Operation / Inspection Display LED on the controller board display the operation and inspection status as follows. If LED does not light, it indicates that no power is supplied to the board: Details Power turned on Normal status Faulty status (blinking) 63L connector (red) is open. 63H connector (yellow) is open. 2 connectors (63H/63L) are open. Branch box/outdoor communication error (Signal receiving error)(outdoor unit) Indoor/branch box communication error (Signal receiving error)(branch box) Branch box/outdoor communication error (Transmitting error)(outdoor unit) Indoor/branch box communication error (Transmitting error)(branch box) Mis-Wiring of indoor-branch box / branch box-outdoor unit connecting wire. Too many indoor units / branch box are in the system. Mis-wiring of indoor-branch box/branch box-outdoor unit connecting wire (converse wiring or disconnection) Startup time over ommunication error except for outdoor unit ombination errer, undefined error Serial communication error ode (blinks) Operation status display, such as 5. H7 F3 F5 F9 E8 E9 EA Eb Ec E - E7 EE, EF Ed Details ompressor temperature fault Low-discharge superheating fault, Erroneous connection of refrigerant pipes or the connecting wires High pressure fault (63H operates) Low pressure fault (63L operates) Abnormality of power moduls ompressor over current shutoff (Start up locked) urrent sensor fault (P. B.) ompressor overcurrent shutoff fault ompressor thermistor (TH4) open or short-circuit Outdoor unit thermistors (TH3, TH6, TH7), 63HS, and branch dox thermistors open or short-circuit Radiator panel temperature fault Abnormality in outdoor fan motor Voltage fault, current sensor fault Forced compressor stop (Overlap malfunction of drain pump in indoor unit and linear expansion valve in branch box) U2 U7 U UL U6 UF UH UP U3 U4 U5 U8 U9 PA ode autions when Servicing WARNING:When the main supply is turned off, the voltage[54 V]in the main capacitor will drop to 2 V in approx.5 minutes (input voltage : 38 V). when servicing, make sure that LED on the outdoor circuit board goes out, and then wait for at least 5 minute. omponents other than the outdoor board may be faulty : heck and take corrective action, referring to the service manual. Do not replace the outdoor board without checking. OH48D 9

20 7 NEESSARY DITIS FOR SYSTEM STRUTI REFRIGERANT SYSTEM DIAGRAM MXZ-8B4VA MXZ-8B4YA MXZ-8B6VA MXZ-8B6YA ondenser / evaporator temperature thermistor (TH5 or RT2) Room temperature thermistor (TH or RT) E D B A Thermistor (TH-A~E) (Gas pipe temperature) LEV A~E (Linear expansion valve) Strainer # 4-way valve Service port Strainer #5 Ball valve heck valve (Low Pressure) Strainer # Stop valve heck valve Bypass valve(sv2) (High Pressure) Bypass valve (SV) Strainer # apillary tube apillary tube2 Low pressure switch 63L High pressure switch 63H Oil separator Thermistor TH4 (ompressor temperature) Thermistor TH8 (Fin temperature) High pressure sensor discharge pressure sensor 63HS Thermistor TH7 (Outdoor temperature) Thermistor TH6 (Pipe temperature : condenser) Thermistor TH3 (Pipe temperature : liquid) Distributor with Strainer Pipe temperature thermistor / liquid (TH2 or RT3) apillary tube4 Strainer # apillary tube3 Service port Strainer # Accumulator ompressor Refrigerant flow in cooling Refrigerant flow in heating Outdoor unit Branch box Indoor units Branch box Outdoor unit MXZ-8B4VA MXZ-8B6VA MXZ-8B4YA MXZ-8B6YA PA-AK53B PA-AK32B apillary tube (For return of oil from oil separator) apillary tube 2 (For SV2) [2.5 o [.8 o L [4 o [2.4 o L25 apillary tube 3 ahead of LEV (in cooling mode) unit : mm apillary tube 4 behind LEV (in cooling mode) ([4 o [2.4 o L4) o 5 ([4 o [2.2 o L3) o 5 ([4 o [2.4 o L4) o 3 ([4 o [2.2 o L3) o 3 Piping connection size A Liquid (mm) {9.52 Gas (mm) {5.88 B The pipe connection size differs according to the type and capacity of indoor units. Match the piping connection size of branch box with indoor unit. If the piping connection size of branch box does not match the piping connection size of indoor unit, use optional different-diameter (deformed) joints to the branch box side. (onnect deformed joint directly to the branch box side.) In case of using -branch box Flare connection employed (No brazing) A Branch box B B B B B In case of using 2-branch boxes 2 branches pipe (joint) : optional parts A A A Branch box # B B B B B installation procedure (2 branch pipe (joint)) Refer to the installation manuals of MSDD-5AR-E and MSDD-5BR-E. OH48D Branch box #2 2

21 Pipe size (Branch box-indoor unit) *For M series or S series Indoor unit Indoor unit type Pipe size (mm) (kw) Liquid Gas 5 [6.35 [ [6.35 [ [6.35 [ [6.35 [ [6.35 [ [6.35 [ [6.35 [ [6.35 [2.7 6 [6.35 [5.88 * 7 [9.52 [ [9.52 [5.88 When using 6 type indoor unit of MEXZ series, use the flare nut in the indoor unit accessory for the gas side connecting of indoor unit. Do not use the flare nut (gas side) attached to the indoor unit. If it is used, a gas leakage or even a pipe extraction may occur. Pipe size (Branch box-indoor unit) *For P series Indoor unit Indoor unit type Pipe size (mm) (kw) Liquid Gas 35 [6.35 [2.7 5 [6.35 [2.7 6 [9.52 [ [9.52 [5.88 w [9.52 [5.88 When using 35, 5 type indoor unit of P series, use the flare nut (for R4A) attached to the indoor unit. Do not use the flare nut (for R47) in the indoor unit accessory. If it is used, a gas leakage or even a pipe extraction may occur. * For the connection of P indoor unit(s), use the refrigerant pipes specified in the table below. Branch box Port A Port B Port Port D Port E a a Y-shape connection pipe b <Length limit> [m] a a+b 5[m] Indoor unit (P) Distance between branch box and Liquid Gas Y-shape connection pipe (=a) a b a b to [m] [m] or more * 5.88 * To connect a 2.7 gas pipe, use a joint pipe (MA-A454JP) () Valve size for outdoor unit For liquid For gas (2) Valve size for branch unit * Liquid pipe A UNIT Gas pipe * Liquid pipe B UNIT Gas pipe * Liquid pipe UNIT Gas pipe Liquid pipe D UNIT Gas pipe Liquid pipe E UNIT Gas pipe * 3- branch type is only for A, B, and unit. [9.52 mm [5.88 mm [6.35 mm [9.52 mm [6.35 mm [9.52 mm [6.35 mm [9.52 mm [6.35 mm [9.52 mm [6.35 mm [2.7 mm Different-diameter joint (optional parts) (Fig.7-) Model name onnected pipes diameter Diameter A Diameter B mm mm mm MA-A454JP {9.52 {2.7 {9.52 {2.7 MA-A455JP {2.7 {9.52 {2.7 {9.52 MA-A456JP {2.7 {5.88 {2.7 {5.88 PA-493PI {6.35 {9.52 {6.35 {9.52 PA-SG76RJ-E {9.52 {5.88 {9.52 {5.88 A Fig.7- B onversion formula /4 inch [6.35mm 3/8 inch [9.52mm /2 inch [2.7mm 5/8 inch [5.88mm 3/4 inch [9.5mm Y-shape connection pipe for type indoor unit (optional parts) (Fig.7-2) onnected pipe diameter Diameter A Diameter B Model name mm mm mm Liquid ø6.35 ø9.52 ø6.35 ø9.52 PA-AK52YP-E Gas ø9.52 ø5.88 ø9.52 ø5.88 A Fig.7-2 B OH48D 2

22 8 TROUBLESHOOTING 8-. TROUBLESHOOTING <heck code display by self-diagnosis and actions to be taken for service (summary)> Present and past check codes are logged and displayed on the wired remote controller and control board of outdoor unit. Actions to be taken for service, which depends on whether or not the trouble is reoccurring at service, are summarized in the table below. heck the contents below before investigating details. Unit conditions at service heck code Actions to be taken for service (summary) The trouble is reoccurring. The trouble is not reoccurring. Displayed Not displayed Logged Judge what is wrong and take a corrective action according to 8-3. SELF-DIAGNOSIS ATI TABLE. onduct trouble shooting and ascertain the cause of the trouble according to 8-4. TROUBLESHOOTING OF PROBLEMS. onsider the temporary defects such as the work of protection devices in the refrigerant circuit including compressor, poor connection of wiring, noise, etc. Re-check the symptom, and check the installation environment, refrigerant amount, weather when the trouble occurred, matters related to wiring, etc. 2Reset check code logs and restart the unit after finishing service. 3There is no abnormality concerning of parts such as electrical component, controller board, remote controller, etc. Not logged Re-check the abnormal symptom. 2onduct trouble shooting and ascertain the cause of the trouble according to 8-4. TROUBLESHOOTING OF PROBLEMS. 3ontinue to operate unit for the time being if the cause is not ascertained. 4There is no abnormality concerning of parts such as electrical component, controller board, remote controller, etc. OH48D 22

23 8-2. HEK POINTS FOR TEST RUN Before test run Turn on the main power switch more than 2 hours before starting operation. Starting operation just after turning on the power switch can severely damage the internal parts. Keep the main power switch turned on during the operation season. After completing installation and the wiring and piping of the indoor and outdoor units, check for refrigerant leakage, looseness in the power supply or control wiring, wrong polarity, and no disconnection of one phase in the supply. Use a 5-volt M-ohm tester to check that the resistance between the power supply terminals and ground is at least M". Do not carry out this test on the control wiring (low voltage circuit) terminals. Warning: Do not use the air conditioner if the insulation resistance is less than M". Insulation resistance After installation or after the power source to the unit has been cut for an extended period, the insulation resistance will drop below M" due to refrigerant accumulating in the compressor. This is not a malfunction. Perform the following procedures.. Remove the wires from the compressor and measure the insulation resistance of the compressor. 2. If the insulation resistance is below M", the compressor is faulty or the resistance dropped due to the accumulation of refrigerant in the compressor. 3. After connecting the wires to the compressor, the compressor will start to warm up after power is supplied. After supplying power for the times indicated below, measure the insulation resistance again. The insulation resistance drops due to accumulation of refrigerant in the compressor. The resistance will rise above M" after the compressor is warmed up for 4 hours. (The time necessary to warm up the compressor varies according to atmospheric conditions and refrigerant accumulation.) To operate the compressor with refrigerant accumulated in the compressor, the compressor must be warmed up at least 2 hours to prevent breakdown. 4. If the insulation resistance rises above M", the compressor is not faulty. aution: The compressor will not operate unless the power supply phase connection is correct. Turn on the power at least 2 hours before starting operation. Staring operation immediately after turning on the main power switch can result in severe damage to internal parts. Keep the power switch turned on during the operational season. The followings must be checked as well. The outdoor unit is not faulty. LED on the control board of the outdoor unit flashes when the outdoor unit is faulty. Both the gas and liquid stop valves are completely open Test run () Using remote controller Refer to the indoor unit installation manual. Be sure to perform the test run for each indoor unit. Make sure each indoor unit operates properly following the installation manual attached to the unit. If you perform the test run for all indoor units at once, you cannot detect any erroneous connection, if any, of the refrigerant pipes and the connecting wires. * The compressor operation is not available for 3 minutes at least after the power is supplied. The compressor can emit noise just after turn on the power supply or in case of low outside air temperature. About the restart protective mechanism Once the compressor stops, the restart preventive device operates so the compressor will not operate for 3 minutes to protect the air conditioner. OH48D 23

24 (2) Using SW4 in outdoor unit In case of the test run from outdoor unit, all indoor units operate. Therefore, you cannot detect any erroneous connection of refrigerant pipes and the connecting wires. If it aims at detection of any erroneous connection, be sure to carry out the test run from remote controller with reference to "() Using remote controller." SW4- SW4-2 SW4- SW4-2 OFF ooling operation Heating operation Note: After performing the test run, set SW4- to OFF. A few seconds after the compressor starts, a clanging noise may be heard from the inside of the outdoor unit. The noise is coming from the check valve due to the small difference in pressure in the pipes. The unit is not faulty. The test run operation mode cannot be changed by DIP switch SW4-2 during the test run. To change the test run operation mode during the test run, stop the test run by DIP switch SW4-. After changing the test run operation mode, resume the test run by switch SW4-. When a test run is started by Using SW4 in outdoor unit, even if it carries out stop instructions by remote controller, outdoor unit does not stop. A test run is not ended. In this case, please set SW4 in outdoor unit to off. After power is supplied or after an operation stop for a while, a small clicking noise may be heard from the inside of the branch box. The electronic expansion valve is opening and closing. The unit is not faulty. Note: Be sure to wait at least 3 minutes after turning on the power supply before setting SW4- and SW4-2. If the DIP switches are set before 3 minutes have elapsed, the test run may not start Test run by outdoor unit SW4 The setting of test run (/OFF) and its operation mode (cooling/heating) can be set by SW4 on the controller board of outdoor unit. Set operation mode (cooling or heating) by SW Start test run by setting SW4- to ( ) with the indicated operation mode of SW Finish test run by setting SW4- to OFF ( ). SW4 Operation mode cannot be changed by SW4-2 during test run. D Stop test run to change operation mode by SW4-, and restart test run by SW4- after the mode is changed. Test run automatically stops 2 hours later by 2-hour OFF timer function. Test run can be performed by the remote controller. 2 The remote controller display of test run by outdoor unit is the same as that of test run by A B remote controller. If test run is set with the outdoor unit, the test run is performed for all indoor units. The remote controller operation becomes unavailable once the test run is set with the outdoor unit. (Initial setting) A Stop B ooling Operation D Heating During the test run set with the outdoor unit, operation on/off or operation mode change cannot be performed by the remote controller, and the operation relating to the test run which is made with the outdoor unit will be prior to any other commands from the remote controller. Set the SW4- to OFF ( ) to finish test run. Emergency operation is not available for this model. OH48D 24

25 8-3. SELF-DIAGNOSIS ATI TABLE <Abnormalities detected when the power is put on> (Note ) Refer to indoor unit section for code P and code E. heck code Abnormal point and detection method ase Judgment and action None No voltage is supplied to terminal block (TB) of outdoor unit. a) Power supply breaker is turned off. b) ontact failure or disconnection of power supply terminal c) Open phase (L or N phase) 2 Electric power is not charged to power supply terminal of outdoor power circuit board. a) ontact failure of power supply terminal b) Open phase on the outdoor power circuit board Disconnection of connector S-R or S-S 3 Electric power is not supplied to outdoor controller circuit board. a) Disconnection of connector (ND) heck following items. a) Power supply breaker b) onnection of power supply terminal block. (TB) c) onnection of power supply terminal block. (TB) 2 heck following items. a) onnection of power supply terminal block. (TB) b) onnection of terminal on outdoor power circuit board. Disconnection of connector S-R or S-S Refer to "8-7. TEST POINT DIAGRAM". 3 heck connection of the connector (ND) on the outdoor controller circuit board. heck connection of the connector, ND on the outdoor power circuit board. Refer to "8-7. TEST POINT DIAGRAM". 4 Disconnection of reactor (DL) 4 heck connection of reactor. (DL) heck connection of L and L2 on the active filter module. (ATM) 5 Disconnection of outdoor noise filter circuit board or parts failure in outdoor noise filter circuit board 5 a) heck connection of outdoor noise filter circuit board. b) Replace outdoor noise filter circuit board. Refer to "8-7. TEST POINT DIAGRAM". 6 Defective outdoor power circuit board 7 Defective outdoor controller circuit board 6 Replace outdoor power circuit board. 7 Replace controller board (When items above are checked but the units cannot be repaired.) F3 (522) F5 (52) F9 (49) 63L connector open Abnormal if 63L connector circuit is open for 3 minutes continuously after power supply 63L: Low-pressure switch 63H connector open Abnormal if 63H connector circuit is open for 3 minutes continuously after power supply 63H: High-pressure switch 2 connector open Abnormal if both 63H and 63L connector circuits are open for 3 minutes continuously after power supply 63H: High-pressure switch 63L: Low-pressure switch Disconnection or contact failure of 63L connector on outdoor controller circuit board 2 Disconnection or contact failure of 63L 3 63L is operating due to refrigerant leakage or defective parts. 4 Defective outdoor controller circuit board Disconnection or contact failure of 63H connector on outdoor controller circuit board 2 Disconnection or contact failure of 63H 3 63H is operating due to defective parts. 4 Defective outdoor controller circuit board Disconnection or contact failure of connector (63H, 63L) on outdoor controller circuit board. 2 Disconnection or contact failure of 63H, 63L 3 63H and 63L are operating due to defective parts. 4 Defective outdoor controller board heck connection of 63L connector on outdoor controller circuit board. Refer to "8-7. TEST POINT DIAGRAM". 2 heck the 63L side of connecting wire. 3 heck refrigerant pressure. harge additional refrigerant. heck continuity by tester. Replace the parts if the parts are defective. 4 Replace outdoor controller circuit board. heck connection of 63H connector on outdoor controller circuit board. Refer to "8-7. TEST POINT DIAGRAM". 2 heck the 63H side of connecting wire. 3 heck continuity by tester. Replace the parts if the parts are defective. 4 Replace outdoor controller circuit board. heck connection of connector (63H,63L) on outdoor controller circuit board. Refer to "8-7. TEST POINT DIAGRAM". 2 heck the 63H and 63L side of connecting wire. 3 heck continuity by tester. Replace the parts if the parts are defective. 4 Replace outdoor controller circuit board. OH48D 25

26 heck code Abnormal point and detection method ase Judgment and action EA (6844) Indoor branch box/branch box outdoor unit connector miswiring, excessive number of units Outdoor/branch box controller circuit board can automatically check the number of connected indoor units. Abnormal if the number cannot be checked automatically due to miswiring of indoor branch box/ branch box outdoor unit connecting wire and etc. after power is turned on for 4 minutes. ontact failure or miswiring of indoor/outdoor unit connecting wire 2 Diameter or length of indoor branch box/branch box outdoor unit connecting wire is out of specified capacity. There are 9 or more indoor units in the system. There are 3 or more branch boxes in the system. More than two P indoor units are connected to the branch box. heck disconnection or looseness or polarity of indoor branch box/branch box outdoor unit connecting wire of indoor and outdoor units. Before connecting P indoor unit(s), check the requirements described in "9-2. WIRING TO P INDOOR UNITS". 2 heck diameter and length of indoor branch box/branch box outdoor unit connecting wire. Total wiring length: 55 m (outdoor branch box) (including wiring connecting each branch box unit and between branch box and outdoor unit) Also check if the connection order of flat cable is S, S2, S3. If the error EA is detected, check the number of the indoor units, the branch box and P indoor unit(s) in the system. Eb (6845) Miswiring of indoor branch box/branch box outdoor unit connecting wire (converse wiring or disconnection) Outdoor/branch box controller circuit board can automatically set the unit number of indoor units. Abnormal if the indoor unit number can not be set within 4 minutes after power on because of miswiring (converse wiring or disconnection) of indoor branch box/ branch box outdoor unit connecting wire. 3 Defective transmitting receiving circuit of outdoor/branch box controller circuit board 4 Defective transmitting receiving circuit of branch box/indoor controller board 5 Defective branch box/indoor power board 6 Noise has entered into power supply or indoor branch box/ branch box outdoor unit connecting wire. ontact failure or miswiring of indoor branch box/branch box outdoor unit connecting wire 2 Diameter or length of indoor branch box/branch box outdoor unit connecting wire is out of specified capacity. 4 Defective transmitting receiving circuit of outdoor/branch box controller circuit board 5 Defective transmitting receiving circuit of indoor/branch box controller board 6 Defective indoor/branch box power board 7 Noise has entered into power supply or indoor branch box/ branch box outdoor unit connecting wire. 3 5 Turn the power off once, and on again to check. Replace outdoor controller circuit board, branch box controller board, indoor controller board or indoor power board if abnormality occurs again. 6 heck transmission path, and remove the cause. Note: The descriptions above, -6, are for EA, Eb and E. E (6846) Start-up time over The unit cannot finish start-up process within 4 minutes after power on. ontact failure of indoor branch box/branch box outdoor unit connecting wire 2 Diameter or length of indoor branch box/branch box outdoor unit connecting wire is out of specified capacity. 3 Noise has entered into power supply or indoor branch box/ branch box outdoor unit connecting wire. OH48D 26

27 heck code Abnormal point and detection method ase Judgment and action Faulty connection of LEV For the connection of P indoor unit(s), the connecting wire(s) must be connected to the specified terminal block(s) in the branch box. Incorrect wiring ontact failure or miswiring of indoor/outdoor unit connecting wire The connecting wire(s) from P indoor unit(s) are not connected to the specified terminal block(s) in the branch box. The connecting wire(s) from P indoor unit(s) are connected to an incorrect terminal block(s) in the branch box. heck disconnection or looseness or polarity of indoor branch box/branch box outdoor unit connecting wire of indoor and outdoor units. Before connecting P indoor unit(s), check the requirements described in "9-2. WIRING TO P INDOOR UNITS". EE (73) 2 Diameter or length of indoor branch box/branch box outdoor unit connecting wire is out of specified capacity. 2 heck diameter and length of indoor branch box/branch box outdoor unit connecting wire. Total wiring length: 55 m (outdoor branch box) (including wiring connecting each branch box unit and between branch box and outdoor unit) Also check if the connection order of flat cable is S, S2, S3. If the error EA is detected, check the number of the indoor units, the branch box and P indoor unit(s) in the system. 3 Defective transmitting receiving circuit of outdoor/branch box controller circuit board 4 Defective transmitting receiving circuit of branch box/indoor controller board 5 Defective branch box/indoor power board 6 Noise has entered into power supply or indoor branch box/ branch box outdoor unit connecting wire. 3 5 Turn the power off once, and on again to check. Replace outdoor controller circuit board, branch box controller board, indoor controller board or indoor power board if abnormality occurs again. 6 heck transmission path, and remove the cause. Note: The descriptions above, -6, are for EA, Eb and E. OH48D 27

28 <Abnormalities detected while unit is operating> heck code Abnormal point and detection method ase Judgment and action () High-pressure switch (63H) operated Abnormal if high-pressure switch 63H operated ) Short cycle of indoor unit 2) logged filter of indoor unit ) 6) heck indoor unit and repair defect. ( * ) during compressor operation. 3) Decreased airflow caused by * 4.5 MPa dirt of indoor fan 4) Dirt of indoor heat exchanger 63H: High-pressure switch 5) Locked indoor fan motor (2) High pressure (High - pressure sensor 63HS detect) When high-pressure sensor detects 4.3MPa or more (or over 4.5MPa for 3 minutes) (st detection) during the compressor operation, the compressor stops and restarts operation in 3 minutes. 2 When the sensor detects 4.3MPa or more (or over 4.5MPa for 3 minutes) again (2nd detection) within 3 minutes since the compressor has stopped, the compressor stops again and restarts operation in 3 minutes. 3 When the sensor detects 4.3MPa or 6) Malfunction of indoor fan motor 7) Defective operation of stop valve (Not fully opened) 8) logged or broken pipe 9) Locked outdoor fan motor ) Malfunction of outdoor fan motor ) Short cycle of outdoor unit 2) Dirt of outdoor heat exchanger 3) Decreased airflow caused by defective inspection of out side temperature thermistor (It detects lower temperature than actual temperature.) 4) Disconnection or contact 7) heck if stop valve is fully open. 8) heck piping and repair defectives. 9) 2) heck outdoor unit and repair defect. 3) heck the detected temperature of outside temperature thermistor on LED display. 4) 6) Put the power off and check F5 is displayed when the power is put again. U more (or over 4.5MPa for 3 minutes) failure of connector (63H) on When F5 is displayed, refer to (32) again (3rd detection) within 3 minutes outdoor controller board Judgment and action for F5. since the compressor has stopped, the 5) Disconnection or contact failure compressor stops again and restarts operation in 3 minutes. 4 When the sensor detects 4.3MPa or more (or over 4.5MPa for 3 minutes) again (4th detection) within 3 minutes after 3rd compressor stop, it stops abnormally. In this time <U> is displayed. 5 When the sensor detects 4.3MPa or more (or over 4.5MPa for 3 minutes) after 3 minutes since the compressor has stopped (st or 2nd or 3rd time), it becomes the st detection or the same performance as above-mentioned. 6 It is being delay for abnormal stop during 3 minutes since the compressor has stopped. In this time, check delay code <U> will be displayed. of 63H connection 6) Defective outdoor controller board 7) Defective action of linear expansion valve 8) Malfunction of fan driving circuit 9) Solenoid valve (SV) performance failure (Highpressure cannot be controlled by SV) 2) High-pressure sensor defective 2) High-pressure sensor input circuit defective in multi controller board 7) heck linear expansion valve. Refer to "8-6. HOW TO HEK THE PARTS". 8) Replace outdoor controller board. 9) heck the solenoid valve performance. 2) heck the high-pressure sensor. 2) heck the high-pressure sensor. OH48D 28

29 heck code Abnormal point and detection method ase Judgment and action U2 (2) U3 (54) () High discharging temperature Abnormal if compressor temperature thermistor (TH4) exceeds 25: or : continuously for 5 minutes. Abnormal if pressure detected by high pressure sensor and converted to saturation temperature exceeds 4: during defrosting and compressor temperature thermistor (TH4) exceeds :. (2) Refrigerant shortage abnormality When the conditions of below detecting mode or 2 are satisfied (st detection) during the compressor operation, the compressor stops and restarts operation in 3 minutes. <Detecting mode > When the below conditions are satisfied completely.. ompressor is operating in HEAT mode. 2. Discharge superheat is 7 : or more. 3. Difference of outer temperature thermistor (TH7) and outdoor piping temp. thermistor (TH3) applies to the formula of (TH7-TH3)<5 :. 4. High-pressure sensor is below about 2.4MPa. <Detecting mode 2> When the below conditions are satisfied completely.. ompressor is operating. 2. When cooling, discharge superheat is 8: or more. When heating, discharge superheat is 9 : or more. High pressure sensor is below about 2.32MPa. 2 When the conditions of detecting mode and 2 are satisfied again (2nd detection) within 3 minutes since the compressor has stopped and restarts operation in 3 minutes. 3 When the conditions of detecting mode and 2 are satisfied again (3rd detection) within 3 minutes since the compressor has stopped, it stops abnormality. in this time, <U2> is displayed. 4 When the conditions of detecting mode and 2 are satisfied again after 3 minutes since the compressor has stopped (st time), it becomes the st detection and same performance as above. 5 It is being delay for abnormal stop during 3 minutes since the compressor has stopped. In this time, check delay code <U2> will be displayed. Open/short circuit of compressor temperature thermistor (TH4) Abnormal if open (3 : or less) or short (27 : or more) is detected during compressor operation. (Detection is inoperative for minutes of compressor starting process and for minutes after and during defrosting.) Overheated compressor operation caused by shortage of refrigerant 2 Defective operation of stop valve 3 Defective thermistor 4 Defective outdoor controller board 5 Defective action of linear expansion valve Gas leakage, Gas shortage 2 When heating operation, scant refrigerant operation (When heating, airflow or thermo OFF are mixed-operation, it cause a refrigerant shortage operation.) 3 Ball valve performance failure (Not fully opened.) 4 Error detection of discharge super heat ) High-pressure sensor defective 2) Discharge temperature thermistor defective 3) Thermistor input circuit defective and high-pressure sensor defective in multi controller board 5 Error detection of TH7/TH3 ) Thermistor defective 2) Thermistor input circuit defective in multi controller board Disconnection or contact failure of connector (TH4) on the outdoor controller circuit board 2 Defective thermistor 3 Defective outdoor controller circuit board heck intake superheat. heck leakage of refrigerant. harge additional refrigerant. 2 heck if stop valve is fully open. 34 Turn the power off and check if U3 is displayed when the power is turned on again. When U3 is displayed, refer to Judgement and action for U3. 5 heck linear expansion valve. Refer to "8-6. HOW TO HEK THE PARTS". heck the refrigerant amount. 2 heck the operation condition and refrigerant amount. 3 heck the ball valve is fully opened. 4 ) heck the ball valve is fully opened. 2) heck the resistance of discharge temperature thermistor. 3) According to Monitoring function for outdoor unit, set the SW2 and check the high-pressure sensor level. According to Monitoring function for outdoor unit, set the SW2 and check the discharge temp. thermistor level. When the high-pressure sensor and discharge temp. thermistor are normal, if the above mentioned detecting pressure level and temp. are big different from the actual pressure and temp., replace the multi controller board. 5 ) heck the resistance of thermistor. 2) According to Monitoring function for outdoor unit, set the SW2 and check the outdoor pipe temp. thermistor level. 3) According to Monitoring function for outdoor unit, set the SW2 and check the outer temp. thermistor level. heck connection of connector (TH4) on the outdoor controller circuit board. heck breaking of the lead wire for thermistor (TH4). Refer to "8-6. HOW TO HEK THE PARTS". 2 heck resistance value of thermistor (TH4) or temperature by microprocessor. (Thermistor/TH4: Refer to "8-6. HOW TO HEK THE PARTS".) (SW2 on A-ontrol Service Tool: Refer to "8-8. FUNTI OF SWITHES, NETORS AND JUMPERS") 3 Replace outdoor controller board. OH48D 29

30 heck code Abnormal point and detection method ase Judgment and action () Open/short circuit in the outdoor unit One or more connectors on thermistors (TH3, TH7, and TH8) and outdoor controller circuit board branch box s thermistors (TH-A~E) (TH3, TH7 and TH8) and branch Abnormal if open or short circuit is detected box controller board (TH-A~E) while the compressor is operating. have contact failure or disconnection. Open detection of thermistors TH3 is inoperative for seconds to minutes after compressor starting and minutes after and 2Defective thermistor during defrosting. Note: heck which unit has abnormality in its thermistor by switching the mode of SW2.(Refer to "8-8. 3Outdoor controller circuit board FUNTI OF SWITHES, NETORS AND is defective. JUMPERS") Open/short circuit in the branch box thermistor. (TH-A TH-E) U4 (TH3:55) (TH7:56) (TH8:5) (63HS:52) TH-A~E :53 Thermistors Symbol Name TH3 Thermistor <Outdoor pipe> TH7 Thermistor <Outdoor> TH8 Thermistor <Heatsink> Branch box unit TH-A~E Thermistor (Room A-E) (Gas pipe temperature detection) ( ) (2) High-Pressure sensor (63HS) abnormality When detected pressure in high-pressure sensor is MPa or less during the operation, the compressor stops and restarts operation in 3 minutes. Open detection 4: or below 4: or below 27: or below High-pressure sensor failure Short detection 9: or above 9: or above 2: or above 4: or below 9: or above heck the connector s contact and the electric wires of thermistor. 2heck the resistance value of thermistors or the temperatures by referring to the section of Monitoring function for outdoor unit. (onvert modes by SW2.) 3Replace the whole outdoor controller board. heck the high-pressure sensor. 2 When the detected pressure is MPa or less at just before of restarting, the compressor stops abnormally. In this time, <U4> is displayed. 3 For 3 minutes after the compressor stops, the unit delays to abnormal stop. Then, the outdoor unit address No. and check delay code <U4> blinks alternately on the 7 SEG digital display. 2 Internal pressure decrease by gas leakage 3 onnector contact failure disconnection 2 heck the internal pressure. 3 heck the high-pressure sensor. U5 (423) U6 (425) 4 For 3 minutes after starting compressor, for defrosting or for 3 minutes after recovery from defrosting, abnormality is not determined as abnormality. Abnormal temperature of heatsink Abnormal if heatsink thermistor (TH8) detects temperature indicated 85: Abnormality of power module heck abnormality by driving power module in case overcurrent is detected. (UF or UP error condition) 4 ontroller board input circuit failure The outdoor fan motor is locked. 2 Failure of outdoor fan motor 3 Air flow path is clogged. 4 Rise of ambient temperature 5 Defective thermistor 6 Defective input circuit of outdoor power circuit board 7 Failure of outdoor fan drive circuit Outdoor stop valve is closed. 2 Decrease of power supply voltage 3 Looseness, disconnection or converse of compressor wiring connection 4 Defective compressor 5 Defective outdoor power circuit board 4 heck the controller board 2 heck outdoor fan. 3 heck air flow path for cooling. 4 heck if there is something which causes temperature rise around outdoor unit. (Upper limit of ambient temperature is 46:.) Turn off power, and on again to check if U5 is displayed within 3 minutes. If U4 is displayed instead of U5, follow the action to be taken for U4. 5 heck resistance value of thermistor (TH8) or temperature by microprocessor. (Thermistor/TH8: Refer to "8-6. HOW TO HEK THE PARTS".) (SW2 on A-ontrol Service Tool: Refer to "8-8. FUNTI OF SWITHES, NETORS AND JUMPERS".) 6 Replace outdoor power circuit board. 7 Replace outdoor controller circuit board. Open stop valve. 2 heck facility of power supply. 3 orrect the wiring (U V W phase) to compressor. Refer to "8-7. TEST POINT DIAGRAM" 4 heck compressor referring to "8-6. HOW TO HEK THE PARTS". 5 Replace outdoor power circuit board. OH48D 3

31 heck code Abnormal point and detection method ase Judgment and action () Too low superheat due to low discharge temperature Abnormal if discharge superheat is continuously detected -5: or less even though linear expansion valve has minimum open pulse after compressor starts operating for minutes. Disconnection or loose connection of compressor temperature thermistor. (TH4) 2 Defective holder of discharge temperature thermistor 2 heck the installation conditions of compressor temperature thermistor (TH4). U7 (52) (2) Erroneous connection of refrigerant pipes or the connecting wires onsider the stopping indoor unit abnormal if condenser/evaporator temperature thermistor (TH5 or RT2) detects -5: or below continuously for 5 minutes during a compressor s operation in cooling mode. Failure in piping/wiring 2 Pipe (liquid) is clogged or crushed. heck piping/wiring between branch box and indoor unit. Refer to Test run (Using remote controller). 2 heck the pipe for refrigerant and change the wrong parts. U8 (44) Outdoor fan motor The outdoor fan motor is considered to be abnormal if the rotational frequency of fan motor is abnormal when detected during operation. Fan motor rotational frequency is abnormal if; rpm or below detected continuously for 5 seconds at 26: or more outside air temperature 5 rpm or below or 5 rpm or more detected continuously for minute. Failure in the operation of the D fan motor 2 Failure in the outdoor circuit controller board heck or replace the D fan motor. 2 heck the voltage of the outdoor circuit controller board during operation. 3 Replace the outdoor circuit controller board. (when the failure is still indicated even after performing the remedy above.) U9 (422) Detailed codes 2 To find out the details about U9 error, turn SW2-, 2-2, 2-3, 2-4, 2-5 and 2-6 when U9 error occurs. Refer to "8-8. FUNTI OF SWITHES, NETORS AND JUMPERS". Overvoltage error Increase in D bus voltage to; V model: 4V Y model: 76V Undervoltage error Instantaneous decrease in D bus voltage to; V model: 2V Y model: 35V Abnormal increase in power heck the field facility for the power supply. source voltage 2 orrect the wiring (U. V. W phase) to compressor. Refer to "8-7. Outdoor power circuit 2 Disconnection of compressor wiring board". 3 Defective outdoor power circuit 3 Replace outdoor power circuit board. board 4 heck compressor for electrical insulation. 4 ompressor has a ground fault. Replace compressor. Decrease in power source voltage, instantaneous stop. 2 Disconnection or loose connection of N52 on the outdoor power circuit board/ controller circuit board (V model) 3 Defective converter drive circuit in outdoor power circuit board (V model ) 4 Defective 52 drive circuit in outdoor power circuit board 5 Defective outdoor converter circuit board (Y model) 6 Disconnection or loose connection of rush current protect resistor RS (Y model) 7 Defective rush current protect resistor RS (Y model) 8 Disconnection or loose connection of main smoothing capacitor B (V model) 9 Disconnection or loose connection of N2 on the outdoor power circuit board/ controller circuit board (V model ) Power circuit failure on D supply for 8V D output on outdoor controller circuit board (V model ) heck the field facility for the power supply. 2 heck N52 wiring. (V model ) 3 Replace outdoor power circuit board. (V model ) 4 Replace outdoor power circuit board. 5 Replace outdoor converter circuit board. (Y model) 6 heck RS wiring. (Y model) 7 Replace RS. (Y model) 8 heck B wiring. (V model ) 9 heck N2 wiring. (V model) Replace outdoor controller circuit board. (V model ) OH48D 3

32 heck code Abnormal point and detection method ase Judgment and action U9 (422) Detailed codes 4 8 Input current sensor error/ L-phase open error Decrease in input current through outdoor unit to.a only if operation frequency is more than or equal to 4Hz or compressor current is more than or equal to 6A. Abnormal power synchronous signal No input of power synchronous signal to power circuit board Power synchronous signal of 44 Hz or less, or 65 Hz or more is detected on power circuit board. L-phase open (Y model) 2 Disconnection or loose connection between TB and outdoor noise filter circuit board (Y model) 3 Disconnection or loose connection of N5 on the outdoor power circuit board/ NT on the outdoor noise filter board 4 Defective AT (A current trans) on the outdoor noise filter circuit board (Y model) 5 Defective input current detection circuit in outdoor power circuit board 6 Defective outdoor controller circuit board Distortion of power source voltage, noise superimposition. 2 Disconnection or loose connection of earth wiring 3 Disconnection or loose connection of N2 on the outdoor power circuit board /controller circuit board 4 Defective power synchronous signal circuit in outdoor controller circuit board 5 Defective power synchronous signal circuit in outdoor power circuit board heck the field facility for the power supply. (Y model) 2 heck the wiring between TB and outdoor noise filter circuit board. (Y model) 3 heck N5/NT wiring. (Y model) 4 Replace outdoor noise filter circuit board. (Y model) 5 Replace outdoor power circuit board. 6 Replace outdoor controller circuit board. heck the field facility for the power supply. 2 heck earth wiring. 3 heck N2 wiring. 4 Replace outdoor controller circuit board. 5 Replace outdoor power circuit board. 2 PF/IGBT error (Undervoltage) When ompressor is running, D bus voltage stays at 3V or lower for consecutive seconds (V model only) Incorrect switch settings on the outdoor controller circuit board for model select 2 Defective outdoor power circuit board 3 Defective outdoor controller circuit board orrection of a model select 2 Replace outdoor power circuit board. 3 Replace outdoor controller circuit board. UF (4) ompressor overcurrent interruption (When compressor locked) Abnormal if overcurrent of D bus or compressor is detected within 3 seconds after compressor starts operating. Stop valve is closed. 2 Decrease of power supply voltage 3 Looseness, disconnection or converse of compressor wiring connection 4 Defective compressor 5 Defective outdoor power board Open stop valve. 2 heck facility of power supply. 3 orrect the wiring (U V W phase) to compressor. Refer to "8-7. TEST POINT DIAGRAM". 4 heck compressor. Refer to "8-6. HOW TO HEK THE PARTS". 5 Replace outdoor power circuit board. UH (53) urrent sensor error Abnormal if current sensor detects -.5A to.5a during compressor operation. (This error is ignored in case of test run mode.) Abnormal if input current exceeds 38 A or 34A continuously seconds. (urrent sensor on noise filter board detects input current) Disconnection of compressor wiring 2 Defective circuit of current sensor on outdoor power circuit board orrect the wiring (U V W phase) to compressor. Refer to "8-7. TEST POINT DIAGRAM". 2 Replace outdoor power circuit board. Decrease of power supply voltage heck the facility of power supply. UL (3) Low pressure (63L operated) Abnormal if 63L is operated (under-.3mpa) during compressor operation. 63L: Low-pressure switch Stop valve of outdoor unit is closed during operation. 2 Disconnection or loose connection of connector (63L) on outdoor controller board 3 Disconnection or loose connection of 63L 4 Defective outdoor controller board 5 Leakage or shortage of refrigerant 6 Malfunction of linear expansion valve heck stop valve. 2 4 Turn the power off and on again to check if F3 is displayed on restarting. If F3 is displayed, follow the F3 processing direction. 5 orrect to proper amount of refrigerant. 6 heck linear expansion valve. Refer to "8-6. HOW TO HEK THE PARTS". OH48D 32

33 heck code Abnormal point and detection method ase Judgment and action UP (42) E (No display) E3 (No display) ompressor overcurrent interruption Abnormal if overcurrent D bus or compressor is detected after compressor starts operating for 3 seconds. Remote controller communication error (Signal receiving error) () Abnormal if any signal from I of refrigerant address could not be normally received for 3 minutes. (2) Abnormal if sub remote controller could not receive any signal for 2 minutes. Remote controller communication error (Transmitting error) () Abnormal if sub remote controller could not find blank of transmission path for 6 seconds. (2) Abnormal if remote controller could not finish transmitting 3 times continuously. Stop valve of outdoor unit is closed. 2 Decrease of power supply voltage 3 Looseness, disconnection or converse of compressor wiring connection 4 Defective fan of indoor/outdoor units 5 Short cycle of indoor/outdoor units 6 Defective input circuit of outdoor controller board 7 Defective compressor Defective communication circuit of remote controller 2 Defective communication circuit of indoor controller board of refrigerant address 3 Noise has entered into transmission line of remote controller. 4 All remote controllers are set as sub remote controller. In this case, E4 is displayed at outdoor LED, and E is displayed at remote controller. Defective communication circuit of remote controller 2 Noise has entered into transmission line of remote controller. 3 Two remote controllers are set as "main." (In case of 2 remote controllers) Open stop valve. 2 heck facility of power supply. 3 orrect the wiring (U V W phase) to compressor. Refer to "8-7. TEST POINT DIAGRAM". 4 heck indoor/outdoor fan. 5 Solve short cycle. 6 Replace outdoor controller circuit board. 7 heck compressor. Refer to "8-6. HOW TO HEK THE PARTS". Note: Before the replacement of the outdoor controller circuit board, disconnect the wiring for compressor from the outdoor power circuit board and check the output voltage among phases, U, V, W, during test run. No defect on board if voltage among phases (U-V, V-W and W-U) is same. Make sure to perform the voltage check with same performing frequency. 3 Diagnose remote controller. Take actions as follows according to diagnosis result. a) When R OK is displayed, remote controllers have no problem. Turn the power off, and on again to check. If, PLEASE WAIT or H is displayed for 4 minutes or more, replace indoor controller board. b) When R NG is displayed, replace remote controller. c) When R E3 or ER -66 is displayed, noise may be causing abnormality. 4 Set a remote controller to main, and the other to sub. Note: The descriptions above, -3, are for E and E3. E8 (684) E9 (684) Indoor - branch box/branch box - outdoor unit communication error (Signal receiving error) (Branch box/outdoor unit) Abnormal if branch box/outdoor controller circuit board could not receive anything normally for 3 minutes. Indoor - branch box/branch box - outdoor unit communication error (Transmitting error) (Branch box/outdoor unit) () Abnormal if receiving is detected 3 times continuously though branch box/outdoor controller circuit board has transmitted. (2) Abnormal if branch box/outdoor controller circuit board could not find blank of transmission path for 3 minutes. ontact failure of indoor/outdoor unit connecting wire 2 Defective communication circuit of branch box/outdoor controller circuit board 3 Defective communication circuit of indoor/branch box controller board 4 Noise has entered into indoor branch box/branch box outdoor unit connecting wire. Indoor branch box/ branch box outdoor unit connecting wire has contact failure. 2 Defective communication circuit of outdoor controller circuit board 3 Noise has entered power supply. 4 Noise has entered Indoor branch box/branch box outdoor unit connecting wire. heck disconnection or looseness of indoor branch box/branch box outdoor unit connecting wire of indoor or branch box or outdoor units. 2 4 Turn the power off, and on again to check. Replace indoor controller board or branch controller board or outdoor controller circuit board if abnormality is displayed again. heck disconnection or looseness of indoor branch box/branch box outdoor unit connect-ing wire. 2 4 Turn the power off, and on again to check. Replace outdoor controller circuit board if abnormality is displayed again. EF (667 or 668) Non defined check code This code is displayed when non defined check code is received. Noise has entered transmission wire of remote controller. 2 Noise has entered Indoor branch box/branch box outdoor unit connecting wire. 3 Model name of remote controller is PAR-S25A. 2 Turn the power off, and on again to check. Replace indoor controller board or branch controller board or outdoor controller circuit board if abnormality is displayed again. 3 Replace remote controller with MA remote controller. OH48D 33

34 heck code Abnormal point and detection method ase Judgment and action Ed (43) Serial communication error Abnormal if serial communication between outdoor controller circuit board and outdoor power circuit board is defective. Breaking of wire or contact failure of connector N2 between the outdoor controller circuit board and the outdoor power circuit board 2 Breaking of wire or contact failure of connector N4 between the outdoor controller circuit board and the outdoor power circuit board 3 Defective communication circuit of outdoor power circuit board 4 Defective communication circuit of outdoor controller circuit board for outdoor power circuit board 2 heck connection of each connector N2 and N4 between the outdoor controller circuit board and the outdoor power circuit board. 3 Replace outdoor power circuit board. 4 Replace outdoor controller circuit board. Forced compressor stop. (Overlap malfunction of drain pump in indoor unit and linear expansion valve in branch box.) Drain pump trouble 2 Drain defective Drain pump clogging Drain pipe clogging 3 Open circuit of drain sensor side heater 4 ontact failure of drain sensor connector heck the drain pump. 2 Please confirm whether water can be drained. 3 onfirm the resistance of the drain sensor side heater. 4 heck the connector contact failure. PA (252) 5 Dew condensation on drain sensor Drain water descends along lead wire. Drain water waving due to filter clogging 5 heck the drain sensor leadwire mounted. heck the filter clogging. When condition of the outdoor unit is forcefully stopped, which means the drain sensor detects continuously to go under water 5 times, and also detects "[liquid pipe temperature - suction temperature] [ deg" for 3 minutes continuously, the indoor unit and indoor units in same refrigerant system which operates in cooling, heating or dry mode stops abnormally. Also, the outdoor unit which is connected to that indoor unit with refrigerant system stops abnormally (compressor is suspended to operate). In this time, <PA> is displayed. 6 Indoor controller board defective Drain pump drive circuit failure Drain heater output circuit failure 7 Both of above mentioned 6 and the linear expansion valve full closed failure happens synchronistically. 6 If the above mentioned checkpoints has any problem, replace the indoor controller board. 7 heck whether the indoor linear expansion valve leaks or not. OH48D 34

35 8-4. TROUBLESHOOTING OF PROBLEMS Phenomena Factor ountermeasure. Remote controller display operates Refrigerant shortage normally and the unit performs cooling operation, however, the capacity cannot be fully obtained. (The air does not cool well.) 2 Filter clogging 3 Heat exchanger clogging 4 Air duct short cycle If refrigerant leaks, discharging temperature rises and LEV opening increases. Inspect leakage by checking the temperature and opening. heck pipe connections for gas leakage. 2 Open intake grille and check the filter. lean the filter by removing dirt or dust on it. 3 If the filter is clogged, indoor pipe temperature rises and discharging pressure increases. heck if heat exchanger is clogged by inspecting discharging pressure. lean the heat exchanger. 4 Remove the blockage. 2. Remote controller display operates normally and the unit performs heating operation, however, the capacity cannot be fully obtained. Linear expansion valve fault Opening cannot be adjusted well due to linear expansion valve fault. Discharging temperature and indoor heat exchanger temperature does not rise. Inspect the failure by checking discharging pressure. Replace linear expansion valve. 2 Refrigerant shortage 3 Lack of insulation for refrigerant piping 4 Filter clogging 5 Heat exchanger clogging 6 Air duct short cycle 7 Bypass circuit of outdoor unit fault 2 If refrigerant leaks, discharging temperature rises and LEV opening increases. Inspect leakage by checking the temperature and opening. heck pipe connections for gas leakage. 3 heck the insulation. 4 Open intake grille and check the filter. lean the filter by removing dirt or dust on it. 5 If the filter is clogged, indoor pipe temperature rises and discharging pressure increases. heck if heat exchanger is clogged by inspecting discharging pressure. lean the heat exchanger. 6 Remove the blockage. 7 heck refrigerant system during operation. 3. For 3 minutes after temperature adjuster turns off, the compressor will not start operating even if temperature adjuster is turned on. 2 For 3 minutes after temperature adjuster turns on, the compressor will not stop operating even if temperature adjuster is turned off. (ompressor stops operating immediately when turning off by the remote controller.) 2 Normal operation (For protection of compressor) 2 Normal operation OH48D 35

36 8-5. SPEIAL FUNTIS Low noise mode (on-site modification) (Fig. 8-) By performing the following modification, operation noise of the outdoor unit can be reduced by about 3-4 db. The low noise mode will be activated when a commercially available timer or the contact input of an /OFF switch is added to the NDM connector (optional parts) on the control board of the outdoor unit. The capacity may be insufficient according to the outdoor temperature and conditions, etc. omplete the circuit as shown when using the external input adapter (PA-S36NA). (Optional parts) E ~ A F SW X B X H G I J 2 3 D 3 NDM Fig. 8- A Remote control panel B Relay circuit External input adapter (PA-S36NA) D Outdoor unit control board E Replay power supply F Procure locally G Max. m H Orange I Brown J Red Demand function (on-site modification) (Fig. 8-2) It is possible to reduce electricity consumption within a range from to % by performing the following on-site installation. The demand function can be enabled by adding a commercially available input contact point /OFF switch to the NDM connector (the contact point demand input, optional parts). Incorporate the Adapter for external input (PA-S36NA) into the circuit as shown in the diagram below. 2 By switching SW7- on the control circuit board for the outdoor unit, the following power consumption restrictions (compared to rated power) can be set. SW7- Power consumption when SW2 is on OFF % (Forced compressor stop) 5% E A B H ~ I 2 J SW2 Y 3 Y F D 3 NDM A Remote control panel B Relay circuit External input adapter (PA-S36NA) D Outdoor unit control board E Replay power supply F Procure locally G Max. m H Orange I Brown J Red Fig Error and compressor operation monitoring function (N5) E E ~ ~ A L L2 A SW SW2 X Y B X Y F F B X Y X Y G G G D N5 5 D N3S 3 A Distant control board B Relay circuit External output adapter (PA-SA88HA-E) D Outdoor unit control board L : Error display lamp L2 : ompressor operation lamp X, Y : Relay (oil standard of.9w or less for D 2V) X, Y : Relay (DmA) Fig Auto change over - Operation mode locking function by external signal (N3S) A Remote control panel B Relay circuit External input adapter (PA-S36NA) D Outdoor unit control board SW SW2 Heating Validity of SW OFF ooling Invalidity of SW E Lamp power supply F Procure locally G Max. m E Relay power supply F Procure locally G Max. m * The indoor unit, which is operating in the mode different from the one determined by external signal (N3S), will be a state of standby. * The setting becomes effective when the outdoor unit is under stop. * The operation mode specified by test run will be prior to the mode of this function. Fig. 8-4 OH48D 36

37 8-6. HOW TO HEK THE PARTS MXZ-8B4VA MXZ-8B4YA MXZ-8B6VA MXZ-8B6YA Parts name Thermistor (TH3) <Outdoor pipe> Thermistor (TH4) <ompressor> Thermistor (TH7) <Outdoor> Thermistor (TH8) <Heatsink> heck points Disconnect the connector then measure the resistance with a tester. (At the ambient temperature :~3:) TH4 TH3 TH7 TH8 Normal 6k" ~ 4k" 4.3k" ~ 9.6k" 39k" ~ 5k" Abnormal Open or short Fan motor(mf,mf2) Solenoid valve coil <Four-way valve> (2S4) Motor for compressor (M) U V W Refer to next page. Measure the resistance between the terminals with a tester. (At the ambient temperature 2:) Normal MXZ-8B4VA/6VA MXZ-8B4YA/6YA 435 ± 5" MXZ-8B4VA/6VA MXZ-8B4YA/6YA.88".32" Abnormal Open or short Measure the resistance between the terminals with a tester. (Winding temperature 2:) Normal Abnormal Open or short Solenoid valve coil <Bypass valve> (SV) Measure the resistance between the terminals with a tester. (At the ambient temperature 2:) Normal 327 ± " Abnormal Open or short Solenoid valve coil <Bypass valve> (SV2) Measure the resistance between the terminals with a tester. (At the ambient temperature 2:) Normal Abnormal MXZ-8B4VA/6VA MXZ-8B4YA/6YA Open or short 45 ± 5" OH48D 37

38 heck method of D fan motor (fan motor / outdoor controller circuit board) Notes High voltage is applied to the connecter (NF, 2) for the fan motor. Pay attention to the service. Do not pull out the connector (NF, 2) for the motor with the power supply on. (It causes trouble of the outdoor controller circuit board and fan motor.) 2 Self check Symptom : The outdoor fan cannot turn around. Fuse check heck the fuse (F5) on outdoor controller board. Did the fuse blow? No Wiring contact check ontact of fan motor connector (NF, 2) Yes Replace outdoor controller board (.B) and fan motor (MF, 2). Is there contact failure? Yes Wiring recovery No Power supply check (Remove the connector (NF, 2)) Measure the voltage in the outdoor controller circuit board. TEST POINT : VD (between (+) and 4 (-) of the fan connector): VD D25~33V TEST POINT 2 : V (between 5 (+) and 4 (-) of the fan connector): V D5V Is the voltage normal? No Replace outdoor controller board. OK Yes Replace the fan motor. Yes heck the operation of fan. NG Replace outdoor controller board. OK END heck the operation. END NG Replace the fan motor. OH48D 38

39 <Thermistor feature chart> Low temperature thermistors Pipe temperature thermistor <Liquid> (TH3) Pipe temperature thermistor <ond.> (TH6) Outdoor temperature thermistor (TH7) Gas pipe temperature thermistor (TH-A ~ TH-E) Branch box Thermistor R = 5 k" ± 3 % B constant = 348 ± 2 % Rt =5exp{348( 273+t 273 )} Resistance (k") : 5 k" : 9.6 k" 2 : 6.3 k" 25 : 5.4 k" 3 : 4.3 k" 4 : 3. k" Temperature (:) Medium temperature thermistor 2 Heatsink temperature thermistor (TH8) Thermistor R5 = 7 k" ± 2% B constant = 47 ± 3% Rt =7exp{47( 273+t 323 )} : 8 k" 25 : 5 k" 5 : 7 k" 7 : 8 k" 9 : 4 k" Resistance (k") Temperature (:) High temperature thermistor 5 ompressor temperature thermistor (TH4) Thermistor R2 = k" ± 2 % B constant = 457 ± 2% Rt =7.465exp{457( 273+t 393 )} 2 : 25 k" 3 : 6 k" 4 : 4 k" 5 : 7 k" 6 : 48 k" 7 : 34 k" 8 : 24 k" 9 : 7.5 k" : 3. k" : 9.8 k" Resistance (k") <HIGH PRESSURE SENSOR> Vout (V) OH48D PRESSURE (MPa) SENSOR Vout WHT BLU BLK 39 5V D 3 63HS 3- : 5V (D) 2- : Output Vout (D) OUTDOOR TROLLER IRUIT BOARD 2 GND MIRO PROESSOR Temperature (:)

40 8-7. TEST POINT DIAGRAM <AUTI> TEST POINT is high voltage Outdoor controller circuit board MXZ-8B4VA MXZ-8B4YA MXZ-8B6VA MXZ-8B6YA NDM SW Forced defrost, detect history record reset SW7 SW9 SW2 to 2: Input of low-level sound priority mode to 3: Input of external contact point N5 N3S N52 onnect to the noise filter circuit board (N52) (MXZ-8B4/6VA) SW6 Model select SW4 Test operation SW5 Function switch N4 SW8 Transmission to outdoor power circuit board (N4) LED SV Solenoid valve 63L SV2 Low pressure switch Solenoid valve 2 63HS High pressure sensor 2S4 Four-way valve TH4 Thermistor <ompressor> TH3 Thermistor <Outdoor pipe> N2 onnect to the outdoor power circuit board (N2) -5: Reception from power circuit board 2-5: Zero cross signal (-5V D) 3,4: Not used 6-5: 6V D 7-5: 6V D TH7/6 Thermistor <Outdoor 2-phase pipe> 63H High pressure switch NA VFG 2 to 4: Power supply for outdoor controller circuit board (22V-24V A) to 3: Power supply for indoor and outdoor unit connection wire (22-24V A) (Voltage between right pins of P5 and P5D, pin 3 and pin 4) (Same as (NF7(+)-4(-)) VSP (Voltage between pins of 5A, 5B): D V (when stopped), D 6.5V (when operated) NS NF, NF2 onnect to the fan motor -4: 25-33V D 5-4: 5V D 6-4: -6.5V D 7-4: 5V D (When stopped) 7.5V D (When operated) (V-5V pulse) OH48D ND 25-33V D (+, 3-) (Outdoor power circuit board for VA) (Noise filter circuit board for YA) S-S2: 22-24V A (Branch box/outdoor unit connecting wire) ommunication power supply D7 Voltage 24V D

41 Outdoor noise filter circuit board MXZ-8B4YA MXZ-8B6YA LI, LI2, LI3, NI POWER SUPPLY LI-LI2/LI-LI3/LI3-LI : A38/4/45V input LI-NI/LI2-NI/LI3-NI : A22/23/24V input (onnect to the terminal block (TB)) GD onnect to the earth GD3 onnect to the earth NA, NA2 A22/23/24V (onnect to the outdoor controller circuit board (NA)) NT Primary current ND (onnect to the outdoor power circuit board (N5)) (onnect to the outdoor controller circuit board (ND)) NL onnect to the AL4 OH48D NO onnect to the outdoor converter circuit board (N-IN) LO, LO2, LO3 POWER SUPPLY LO-LO2/LO2-LO3/LO3-LO: A38/4/45V OUTPUT 4

42 Outdoor power circuit board MXZ-8B4VA MXZ-8B6VA N4 onnect to the outdoor controller circuit board (N4) N2 onnect to the smoothing capacitor B - N2 onnect to the outdoor controller circuit board (N2) -5: Transmitting signal to outdoor controller circuit board (-5 V D) 2-5: Zero cross signal (-5 V D) 3-4: 8 V D 6-5: 6 V D 7-5: 6 V D N52 52 driving signal onnect to the outdoor controller circuit board (N52) ND V D (+, 3-) onnect to the outdoor controller circuit board (ND) E2, E3 onnect to the earth U/V/W onnect to the compressor (M) Voltage among phases: V-8 V A P2 onnect to the smoothing capacitor B + DL, DL2 onnect to DL EI, E4 onnect to the earth NA, NA V A onnect to the outdoor controller circuit board (NA) NI, LI Voltage of V A is input (onnect to the terminal block (TB)) OH48D 42

43 Brief heck of POWER MODULE * Usually, they are in a state of being short-circuited if they are broken. Measure the resistance in the following points (connectors, etc.). If they are short-circuited, it means that they are broken.. heck of POWER MODULE heck of DIODE circuit L - P, L2 - P, L3 - P, L - N, L2 - N, L3 - N 2 heck of IGBT circuit P2 - U, P2 - V, P2 - W, N2 - U, N2 - V, N2 - W Note: The marks, L, L2, L3, N, N2, P, P2, U, V and W shown in the diagram are not actually printed on the board. Outdoor power circuit board MXZ-8B4YA MXZ-8B6YA N5 Detection of primary current (onnect to the outdoor noise filter circuit board (NT)) N4 onnect to the outdoor controller circuit board (N4) N2 onnect to the outdoor controller circuit board (N2) -5: Power circuit board Transmitting signal to the controller board (-5V D) 2-5: Zero cross signal (-5V D), 2, 6, 7 : + ] 3-4: Not used [ 5 : 6-5: 6V D 7-5: 6V D N7 onnect to the outdoor converter circuit board (N7) TB-U, TB-V, TB-W W W onnect to the compressor (M) Voltage among phases: V-4V A W L3 L2 L P P2 TAB connecter on X52A onnect to the RS resistor N N2 TB-L, TB-L2, TB-L3 onnect to the outdoor converter circuit board (L-OU, L2-OU, L3-OU) (4/6VA) onnect to the outdoor noise filter circuit board (LO, LO2, LO3) (4/6YA) 38V-45V A TB-N onnect to the smoothing capacitor B2, K capacitor (K capacitor only for 4/6VA) TB-P2 TB- onnect to the smoothing capacitor B + OH48D onnect to the smoothing capacitor B, B POWER MODULE

44 Outdoor converter circuit board MXZ-8B4YA MXZ-8B6YA K-OU L-A L-IN, N-IN onnect to the K capacitor onnect to the AL onnect to the noise filter circuit board (LO, No) N7 onnect to the outdoor power circuit board (N7) L-A2, L2-A2, L3-A2 onnect to the AL, AL2, AL3 OH48D L-OU, L2-OU, L3-OU onnect to the outdoor power circuit board (TB-L, L2, L3) 44

45 8-8. FUNTI OF SWITHES, NETORS AND JUMPERS () Function of switches The black square ( ) indicators a switch position. Type of Switch Switch No. Function Action by the switch operation OFF Effective timing 2 3 Forced defrost Start Normal Abnormal history clear No function lear Normal When compressor is operating in heating operation. * off or operating Indoor No Indoor No Indoor No Indoor No Indoor No Indoor No Indoor No Indoor No.8 Dip switch SW <Example> 5 Self-diagnosis (Indoor unit selection) O Indicating a particular self-diagnosis B# (5- branch type) B#2 (3- branch type) A B D E A B I I I I I 6 R Indoor No. R Indoor No.2 R Indoor No.3 R Indoor No.4 R Indoor No.5 B# : branch box controller unit Number blinking LED2 (branch box controller board) B#2 : branch box controller unit Number 2 2 blinking LED2 (branch box controller board) SW4 2 Test run Operating OFF Test run mode setting Heating ooling Under suspension Forced defrost should be done as follows. hange the DIP SW- on the outdoor controller board from OFF to. 2 Forced defrost will start by the above operation if these conditions written below are satisfied. Heat mode setting minutes have passed since compressor started operating or previous forced defrost finished. Pipe temperature is less than or equal to 8:. 3 Forced defrost will finish if certain conditions are satisfied. * Forced defrost can be done if above conditions are satisfied when DIP SW- is changed from OFF to. After DIP SW- is changed from OFF to, there is no problem if DIP SW- is left or changed to OFF again. This depends on the service conditions. OH48D 45

46 Type of Switch Dip switch Switch SW5 SW7 SW8 SW6 SW9 No. Function Action by the switch operation OFF Effective timing No function 2 Switching the target sub-cool (Heating mode) Target sub-cool down Normal Always 3, 4 No function 5, 6 No function Demand switching apability cut function 5% Normal Always 2 No function 3 Max. Frequency down Active Normal Always 4 No function 5 No function 6 No function No function 2 No function 3 No function V OFF V OFF 4 Model selection Y OFF Y OFF LEV opening setting function for stopping unit during heating operation Switching function of defrosting prohibited time Switching the Input urrent Limit Level hanged For high humidity 3 A down The black square ( ) indicators a switch position. Normal Normal Normal Always Always Before turning the power on 4 During the FAN or OOL mode, and thermo - OFF in heating operation, set the opening of liner expansion valve on branch box Active Inactive While unit stopping (2) Function of connector Action by Pin short operation Types onnector Function Effective timing Pin -2 Short Pin 2-3 Short onnector N3 LEV opening function (at start-up) Open a little bit Normal When power supply OH48D 46

47 <Outdoor unit operation monitor function> Digital indicator LED3 displays 2 digit number or code to inform operation condition and the meaning of check code by controlling DIP SW2 on outdoor controller. Operation indicator SW2 : Indicator change of self diagnosis SW2 setting Display detail Explanation for display Unit <Digital indicator LED3 working details> (Be sure that to 6 in the SW2 are set to OFF.) () Display when the power supply is. When the power supply is, blinking displays by turns. Wait for 4 minutes at the longest. (2) When the display lights (Normal operation) Operation mode display second interval LED3 (Lighting) SW2 (Initial setting) The tens digit : Operation mode Display Operation Model O H d OFF / FAN OOLING / DRY HEATING DEFROSTING 2 Display during error postponement Postponement code is displayed when compressor stops due to the work of protection device. Postponement code is displayed while error is being postponed. The ones digit : Relay output Display Warming-up ompressor A 47 ompressor 4-way valve (3) When the display blinks Inspection code is displayed when compressor stops due to the work of protection devices. Display Inspection unit Display ontents to be inspected (During operation) Display ontents to be inspected (When power is turned on) F3 F5 F9 E8 E9 EA Eb Ec E~E7 EE, EF Ed Outdoor unit, Branch box unit Indoor unit U2 U7 U UL U6 UF UH UP U3 U4 U5 U8 U9 63L connector(red) is open. 63H connector(yellow) is open. 2 connectors (63H/63L) are open. Branch box/outdoor communication error (Signal receiving error) (Outdoor unit) Indoor/branch box communication error (Signal receiving error) (Branch box) Branch box/outdoor communication error (Transmitting error) (Outdoor unit) Indoor/branch box communication error (Transmitting error) (Branch box) Miswiring of indoor - branch box/branch box - outdoor unit connecting wire Too many indoor units/branch box are in the system. Miswiring of indoor - branch box/branch box - outdoor unit connecting wire(converse wiring or disconnection) Startup time over ommunication error except for outdoor unit ombination error, undefined error Serial communication error OH48D PA Discharge temperature fault Low-discharge superheating fault, Erroneous connection of refrigerant pipes or the connecting wires High pressure fault (63H operates) Low pressure fault (63L operates) Abnormality of power modules ompressor overcurrent shutoff (Start up locked) urrent sensor fault (P. B.) ompressor overcurrent shutoff fault Discharge pipe/compressor thermistor (TH4) open or short-circuit Outdoor unit thermistors (TH3, TH6, TH7, and H8), 63HS, and branch box thermistors open or short-circuit HEATSINK temperature fault Abnormality in outdoor fan motor Voltage fault, current sensor fault (N. F.) Forced compressor stop (Overlap malfunction of drain pump in indoor unit and linear expansion valve in branch box.) Solenoid valve (SV, 2)

48 SW2 setting Display detail Explanation for display Unit Pipe temperature / Liquid (TH3) - 4 to 9 The black square ( ) indicates a switch position. - 4 to 9 (When the coil thermistor detects : or below, and temperature are displayed by turns.) (Example) When - :;.5 secs..5secs. 2 secs. : ompressor temperature (TH4) 3 to 27 3 to 27 (When the discharge thermistor detects : or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 5:;.5 secs..5secs. 2 secs. 5 : Output step of outdoor FAN to to Step The number of / OFF times of compressor to 9999 to 9999 (When the number of times is or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 425 times (425 times);.5 secs..5 secs. 2 secs times ompressor integrating operation times to 9999 to 9999 (When it is hours or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 245 hours (245 hours);.5 secs..5 secs. 2 secs hours ompressor operating current to 5 to 5 Note: Omit the figures after the decimal fractions. A ompressor operating frequency to 225 to 255 (When it is Hz or more, hundreds digit, tens digit and ones digit are displayed by turns. (Example) When 25Hz;.5 secs..5 secs. 2 secs. 25 Hz LEV opening pulse to 5 Indoor unit Indoor unit 2 Indoor unit 3 Indoor unit 4 Indoor unit 5 Indoor unit 6 Indoor unit 7 Indoor unit 8 4 SW 5 Error postponement code history () of outdoor unit 6 to 5 (When it is pulse or more, hundreds digit, tens digit and ones digit are displayed by turns. (Example) When 5 pulse;.5 secs..5 secs. 2 secs. 5 Postponement code display Blinking: During postponement Lighting: ancellation of postponement is displayed in case of no postponement. Pulse ode display Operation mode on error occurring Operation mode of when operation stops due to error is displayed by setting SW2 like below. (SW2) ode display OH48D 48

49 SW2 setting Display detail Explanation for display Unit Pipe temperature / Liquid (TH3) on error occurring - 4 to 9 The black square ( ) indicates a switch position. - 4 to 9 (When the coil thermistor detects : or below, and temperature are displayed by turns.) (Example) When - 5:;.5 secs..5 secs. 2 secs. 5 : ompressor temperature (TH4) or discharge temperature (TH4) on error occurring 3 to 27 3 to 27 (When the temperature is : or more, the hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When - 5:;.5 secs..5 secs. 2 secs. : 3 ompressor operating current on error occurring to 5 to 5 A heck code history () (latest) Alternate display of abnormal unit number and code When no check code history, and are displayed by turns. ode display heck code history (2) Alternate display of error unit number and code When no check code history, and are displayed by turns. ode display Thermostat time to 999 to 999 (When it is minutes or more, the hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 245 minutes;.5 secs..5 secs. 2 secs Minute Test run elapsed time to 2 to 2 (When it is minutes or more, the hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 5 minutes;.5 secs..5 secs. 2 secs. 5 Minute apacity code of indoor unit (Qj) The capacity code of indoor unit is displayed Indoor unit Indoor unit 2 Indoor unit 3 Indoor unit 4 Indoor unit 5 Indoor unit 6 Indoor unit 7 Indoor unit 8 4 SW 5 6 ode display OH48D 49

50 SW2 setting The black square ( ) indicates a switch position. Display detail Explanation for display Unit apacity setting display Displayed as an outdoor capacity code. apacity MXZ-8B4VA/YA ode 25 ode display MXZ-8B6VA/YA 28 Outdoor unit setting information The tens digit (Total display for applied setting) Setting details Display details H P / ooling only Single phase / 3 phase The ones digit Setting details : H P : ooling only : Single phase 2 : 3 phase Display details ode display Defrosting switch : Normal : For high humidity (Example) MXZ-8B4VA, is displayed Indoor pipe temperature / Liquid - 39 to 88 Indoor unit Indoor unit 2 Indoor unit 3 Indoor unit 4 Indoor unit 5 Indoor unit 6 Indoor unit 7 Indoor unit 8 4 SW to 88 (When the temperature is : or less, and temperature are displayed by turns.) : Indoor pipe temperature / ond. / Eva. Indoor SW - 39 to Indoor unit Indoor unit 2 Indoor unit 3 Indoor unit 4 Indoor unit 5 Indoor unit 6 Indoor unit 7 Indoor unit 8-39 to 88 (When the temperature is : or less, and temperature are displayed by turns.) : Branch box pipe temperature / gas - 39 to 88 SW Indoor unit Indoor unit 2 Indoor unit 3 Indoor unit 4 Indoor unit 5 Indoor unit 6 Indoor unit 7 Indoor unit 8-39 to 88 (When the temperature is : or less, and temperature are displayed by turns.) : Targeted evaporating temperature : ETm (ooling) Targeted high pressure : Pdm (Heating) - 39 to to 88 (When the temperature is : or less, and temperature are displayed by turns.) : of/f Indoor room temperature 8 to 39 Indoor unit Indoor unit 2 Indoor unit 3 Indoor unit 4 Indoor unit 5 Indoor unit 6 Indoor unit 7 Indoor unit 8 4 SW to 39 : OH48D 5

51 SW2 setting Display detail Explanation for display Unit Indoor setting temperature 7 to 3 Indoor unit Indoor unit 2 Indoor unit 3 Indoor unit 4 Indoor unit 5 Indoor unit 6 Indoor unit 7 Indoor unit 8 4 SW to 3 The black square ( ) indicates a switch position. : Outdoor pipe temperature / 2-phase (TH6) - 39 to to 88 (When the temperature is : or less, and temperature are displayed by turns.) : Outdoor temperature (TH7) - 39 to to 88 (When the temperature is : or less, and temperature are displayed by turns.) : Outdoor heatsink temperature (TH8) - 4 to 2-4 to 2 (When the temperature is : or less, and temperature are displayed by turns.) (When the thermistor detects : or more, hundreds digit, tens digit and ones digit are displayed by turns.) : Discharge superheat. SHd to 255 to 255 (When the temperature is or more, hundreds digit, tens digit and ones digit are displayed by turns.) Sub-cool. S (cooling mode) to 3 to 3 (When the temperature is or more, hundreds digit, tens digit and ones digit are displayed by turns.) Input current of outdoor unit to 5 (When it is or more, hundreds digit, tens digit and ones digit are displayed by turns.) High pressure 63HS to 5 (When it is or more, hundreds digit, tens digit and ones digit are displayed by turns.) ( to 4.9MPa). A. of/f Targeted operation frequency to 255 to 255 (When it is Hz or more, hundreds digit, tens digit and ones digit are displayed by turns.) Hz D bus voltage V model: 8 to 37 Y model: 3 to 75 8 to 37 (When it is V or more, hundreds digit, tens digit and ones digit are displayed by turns.) V Target Sub-cool (ooling mode) : Sm to 255 : OH48D 5

52 SW2 setting Display detail Explanation for display Unit Error postponement code history (2) of outdoor unit Error postponement code history (3) of outdoor unit heck code history (3) (Oldest) Alternate display of abnormal unit number and code The black square ( ) indicates a switch position. Postponement code display Blinking: During postponement Lighting: ancellation of postponement is displayed in case of no postponement. Postponement code display Blinking: During postponement Lighting: ancellation of postponement is displayed in case of no postponement. When no check code history, and are displayed by turns. ode display ode display ode display Error thermistor display When there is no error thermistor, is displayed. 3: Outdoor pipe temperature /Liquid (TH3) 7: Outdoor outside temperature (TH7) 8: Outdoor radiator panel (TH8) 23: Branch box pipe temperature / Gas (TH A to E) 63: High pressure sensor (63HS) ode display Operation frequency on error occurring to 255 to 255 (When it is Hz or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 25Hz;.5 secs..5 secs. 2 secs. 25 Hz Fan step on error occurring to 5 to 5 Step LEV opening pulse on error occurring to 5 SW Indoor unit Indoor unit 2 Indoor unit 3 Indoor unit 4 Indoor unit 5 Indoor unit 6 Indoor unit 7 to 5 (When it is pulse or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 3 pulse;.5 secs..5 secs. 2 secs. 3 For the use of a P indoor unit, the sum of 2 pulse values is displayed Indoor unit 8 (Example) Pulse Indoor unit (P) = 75 pulse Indoor unit 2 (P other) = 4 pulse SW Display Indoor unit 25 Indoor unit 2 4 Indoor room temperature on error occurring 8 to 39 8 to Indoor unit Indoor unit 2 Indoor unit 3 Indoor unit 4 Indoor unit 5 Indoor unit 6 Indoor unit 7 Indoor unit 8 4 SW 5 6 : OH48D 52

53 SW2 setting Display detail Explanation for display Unit Indoor pipe temperature / Liquid on error occurring SW - 39 to Indoor unit Indoor unit 2 Indoor unit 3 Indoor unit 4 Indoor unit 5 Indoor unit 6 Indoor unit 7 Indoor unit 8 The black square ( ) indicates a switch position to 88 (When the temperature is or less, and temperature are displayed by turns.) (Example) When - 5 ;.5 secs..5 secs. 2 secs. 5 : Indoor pipe temperature / ond./ Eva. on error occurring SW - 39 to Indoor unit Indoor unit 2 Indoor unit 3 Indoor unit 4 Indoor unit 5 Indoor unit 6 Indoor unit 7 Indoor unit to 88 (When the temperature is or less, and temperature are displayed by turns.) (Example) When - 5 ;.5 secs..5 secs. 2 secs. 5 : Outdoor pipe temperature / 2-phase (TH6) on error occurring - 39 to to 88 (When the temperature is or less, and temperature are displayed by turns.) (Example) When - 5 ;.5 secs..5 secs. 2 secs. 5 : Outdoor outside temperature (TH7) on error occurring - 39 to to 88 (When the temperature is or less, and temperature are displayed by turns.) (Example) When - 5 ;.5 secs..5 secs. 2 secs. 5 : Outdoor heatsink temperature (TH8) on error occurring - 4 to 2-4 to 2 (When the temperature is or less, and temperature are displayed by turns.) (When the temperature is or more, hundreds digit, tens digit and ones digit are displayed by turns.) : Discharge superheat on error occurring SHd to 255 to 255 (When the temperature is or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 5 ;.5 secs..5 secs. 2 secs. 5 : Sub-cool on error occurring. S to 3 to 3 (When the temperature is or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 5 ;.5 secs..5 secs. 2 secs. 5 : OH48D 53

54 SW2 setting Display detail Explanation for display Unit Thermostat-on time until error stops to 999 to 999 (When it is minutes or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 45 minutes;.5 secs..5 secs. 2 secs. Minute The black square ( ) indicates a switch position. 4 5 Target rotation of outdoor fan motor to rpm Sub-cool (Heating mode) to 3 SW Indoor unit Indoor unit 2 Indoor unit 3 Indoor unit 4 Indoor unit 5 Indoor unit 6 Indoor unit 7 Indoor unit 8 : ode of the difference between room temperature and set temperature (" Tj": to 99) Tens digit of code: current Tj Units digit of code: Tj a minute ago ode of the difference between room temperature and set temperature (" tj") tj ooling Heating tj = room temp. - Set temp. tj = Set temp. - room temp tj [ < tj [ < tj [ -.5. < tj [..5 < tj [.5. < tj [..5 < tj [.5 2. < tj [ < tj [ < tj [ 3. tj [ < tj [.. < tj [.5.5 < tj [.. < tj [.5.5 < tj [ < tj [ < tj [ < tj [ < tj ode display SW setting ( to 4, 5, 6) Target unit Indoor unit Indoor unit 2 Indoor unit 3 Indoor unit 4 Indoor unit 5 Indoor unit 6 Indoor unit 7 Indoor unit U9 Error status during the Error postponement period Description Normal Overvoltage error Undervoltage error L phase interruption error Abnormal power synchronous signal PF/ IGBT error (Undervoltage) Display ode display * Display examples for multiple errors: Overvoltage () + Undervoltage (2) = 3 Undervoltage (2) + Power-sync signal error (8) = A T phase interruption (4) + PF error () = 4 OH48D 54

55 8-9. SELETING FUNTIS USING THE REMOTE TROLLER Each function can be set according to necessity using the remote controller. The setting of function for each unit can only be done by the remote controller. Select function available from the table. () Functions available when setting the unit number to * The functions table below are available only when P-series indoor unit and the wired remote controller is used. *2 After the power supply returns, the indoor unit does not operate for 3 minutes (Some kind of indoor units operate for 3 seconds, after that, it stops for 3 minutes). Above operation is normal. <Table > Function selections Function Settings Mode No. Setting No. Power failure automatic recovery Indoor temperature detecting LOSSNAY connectivity Power supply voltage Frost prevention temperature Humidifier control OFF *2 Data from the indoor unit with remote controller Data from main remote controller Not supported Supported (Indoor unit does not intake outdoor air through LOSSNAY) Supported (Indoor unit intakes outdoor air through LOSSNAY) 24V 22V,23V 2: (Normal) 3: When the compressor operates, the humidifier also operates. When the fan operates, the humidifier also operates : Initial setting (when sent from the factory) Remarks The setting is applied to all the units in the same refrigerant system. OH48D 55

56 9 ELETRIAL WIRING 9-. External wiring procedure (Fig. 9-) E Power supply: 4/6V Single 22/23/24, 5 Hz 22V, 6Hz, 4/6Y 3-phase 38/4/45V, 5Hz Max. Permissive system Impedance :.22(") Note: Power supply input: Outdoor unit only. onnect the lines (), (D) in accordance with the terminal block names to ensure correct polarity. 2 As for lines (), S and S2 are for connecting the power source. And S2 and S3 are for signals. S2 is a common cable for the power source and signal. Wire diameter (A) Main power () Signal line/ (B) Earth line Model line Earth line 4/6V 6. mm² 6. mm².5 mm² */ Min..5 mm² 4/6Y.5 mm².5 mm².5 mm² */ Min..5 mm² When using twisted wire for the wiring, the use of round terminal is required. * Max 45 m ( Outdoor unit-branch box # plus branch box # -Branch box # 2 ). If 2.5 mm² used, Max 55 m. Notes:. Wiring size must comply with the applicable local and national code. 2. Power supply cords and Indoor unit/branch box/outdoor unit connecting cords shall not be lighter than polychloroprene sheathed flexible cord. (Design 6245 IE 57) 3. Install an earth line longer than power cables. Warning: There is high voltage potential on the S3 terminal caused by electrical circuit design that has no electrical insulation between power line and communication signal line. Therefore, please turn off the main power supply when servicing. And do not touch the S, S2, S3 terminals when the power is energized. If isolator should be used between indoor unit, branch box and outdoor unit, please use 3-pole type. For 4-6V (A) E ircuit breaker For 4-6Y E (A) ircuit breaker <Example > (In case of 2- branch boxes) Outdoor unit (B) (A) L N S S2 S3 Outdoor unit (B) (A) L L2 L3 N S S2 S3 () () () Branch box # (5- branch type) TB2B S S2 S3 TB3A S S2 S3 TB3B S S2 S3 TB3 S S2 S3 TB3D S S2 S3 TB3E S S2 S3 TB3A S S2 S3 (D) (D) (D) (D) (D) (D) Indoor unit S S2 S3 S S2 S3 S S2 S3 S S2 S3 S S2 S3 S S2 S3 A ROOM B ROOM ROOM D ROOM E ROOM F ROOM (D) Signal line/ Earth line.5 mm²/ Min..5 mm².5 mm²/ Min..5 mm² Interrupting current 4 A 25 A Breaker Performance characteristic 4 A, 3 ma for. sec. or less 25 A, 3 ma for. sec. or less Warning: Be sure to connect the power supply cords and connecting wires for the indoor units, outdoor units, branch boxes directly to the units (no intermediate connections). Intermediate connections can lead to communication errors in the cords or wires and causes insufficient insulation to ground or a poor electrical contact at the intermediate connection point. (If an intermediate connection is necessary, be sure to take measures to prevent water from entering the cords and wires.) IMPORTANT Make sure that the current leakage breaker is one compatible with higher harmonics. Always use a current leakage breaker that is compatible with higher harmonics as this unit is equipped with an inverter. The use of an inadequate breaker can cause the incorrect operation of inverter. Fig. 9- TB2 S S2 S3 TB3B S S2 S3 TB3 S S2 S3 Branch box #2 (3- branch type) (D) (D) S S2 S3 S S2 S3 G ROOM H ROOM OH48D 56

57 <Example 2> (in case of wiring to P indoor unit(s)) (A) E ircuit breaker (B) (A) L N S S2 S3 () Branch Box (PA-AK52B only) TB3A (D) S S2 S3 TB2B S S2 S3 TB3B S S2 S3 TB3 S S2 S3 TB3D S S2 S3 TB3E S S2 S3 (D) Fig. 9-2 Indoor unit S S2 S3 S S2 S3 S S2 S3 A ROOM P Indoor unit B ROOM P Indoor unit 9-2. Wiring to P indoor units (Fig. 9-2) When wiring P indoor unit(s), only use PA-AK52B branch box. When wiring a single P indoor unit, use TB3A. Notes: When wiring a single P indoor unit, LY use TB3A. If a single P indoor unit is wired to the other terminal block, an alarm will be activated, and the indoor unit will not operate. When a single P indoor unit is wired to TB3A, do not wire any indoor unit to TB3B. Otherwise, an alarm will be activated, and the indoor unit will not operate. TB3, TB3D, and TB3E are available for wiring of indoor units that are not P. When wiring two P indoor units, use TB3A and TB3. Notes: When wiring two P indoor units, LY use TB3A and TB3. If two P indoor units are wired to the other terminal blocks, an alarm will be activated, and the indoor units will not operate. When two P indoor units are wired to TB3A and TB3 respectively, do not wire any indoor unit to TB3B or TB3D. Otherwise, an alarm will be activated, and the indoor unit will not operate. OH48D 57

58 WIRING SPEIFIATIS Warning: In case of A-control wiring, there is high voltage potential on the S3 terminal caused by electrical circuit design that has no electrical insulation between power line and communication signal line. Therefore, please turn off the main power supply when servicing. And do not touch the S, S2, S3 terminals when the power is energized. If isolator should be used between outdoor unit and branch box / indoor units and branch box, please use 3-pole type. Power supply Isolator (Switch) 3 poles isolator (Switch) Outdoor unit S S2 S S2 S S2 S S2 "A-ontrol" Indoor unit S3 S3 S3 Branch - box S3 <AUTI> After using isolator, be sure to turn off and on the main power supply to reset the system. Otherwise, outdoor unit may not be able to detect the branch box(es) or indoor units. WIRING SPEIFIATIS (OUTDOOR-BRANH BOX NETING ABLE) ross section of cable Wire size (e) Number of wires Polarity L (m) w 6 Round lockwise : S-S2-S3 (5) w Pay attention to stripe of yellow and green. w 2 Flat Flat Not applicable (Because center wire has no cover finish) From left to right : S-Open-S2-S3 Not applicable w 5 (45) w 3 Round lockwise : S-S2-S3-Open w onnect S and S3 to the opposite angle. (55) w 4 * : Power supply cords of appliances shall not be lighter than design 6245 IE or 6227 IE. *2 : In case that cable with stripe of yellow and green is available. *3 : In case of regular polarity connection (S-S2-S3), wire size is.5 mm 2. *4 : In case of regular polarity connection (S-S2-S3). *5 : In the flat cables are connected as this picture, they can be used up to 55 m. *6 : Mentioned cable length is just a reference value. S S2 S3 It may be different depending on the condition of installation, humidity or materials, etc. (3 Flat cable o 2) Be sure to connect the outdoor-branch box / indoor units-branch box connecting cables directly to the units (no intermediate connections). Intermediate connections can lead to communication errors if water enters the cables and causes insufficient insulation to ground or a poor electrical contact at the intermediate connection point. (If an intermediate connection is necessary, be sure to take measures to prevent water from entering the cables.) OH48D 58

59 SYSTEM TROL -. BASI SYSTEMS O O : Outdoor unit B : Branch box I : Indoor unit R : Remote controller O NOTE: The indoor units can be connected to any of the 5 connectors (5- branch type) or 3 connectors (3- branch type) of the branch box. B (5- branch type) A B D E B (3- branch type) A B B (5- branch type) B (3- branch type) A B D E A B I I I I I I I I I I I I I R R R R R R R R R R R R R -2. STANDARD SYSTEMS -2-. Only 3-branch type Only 5-branch type branch boxes (3-branch type) O O O B (3- branch type) A B B(5- branch type) A B D E B(3- branch type) A B B(3- branch type) A B I I I I I I I I I I I I I I R R R R R R R R R R R R R R branch boxes (5-branch type, maximum 8 indoor units) O B (5- branch type) A B D E B (5- branch type) A B D E I I I I I I I I I I. Up to 2 branch boxes can be connected to a single outdoor unit. R R R R R R R R R R 2. Up to 8 indoor units can be connected to the system. OH48D 59

60 -3. INORRET SYSTEMS -3-. Group operation by single remote controller O B (3- branch type) A B I I I R R Plural indoor units cannot be operated by a single remote controller Group operation between different refrigerant systems O O B (3- branch type) A B B (3- branch type) A B I I I R R Different refrigerant systems cannot be connected together onnection of M-NET adapter to outdoor unit O B (3- branch type) A B ADP M-NET Master controller (G-5. etc.) Power supply unit I I I R R R A M-NET adapter cannot be connected to an outdoor unit. OH48D 6

61 2 REFRIGERANT PIPING TASK 2-. ADDITIAL REFRIGERANT HARGE A L H h h3 * a a2 b B a3 a4 * Although two refrigerant pipes are used between the branch box and the Y-shape connection pipe when connecting the P indoor unit, calculate the piping lengths using only the length of one pipe. h2 a5 a6 b2 B a7 a8 I A B Outdoor unit Branch box Indoor unit B 2 Indoor unit [P type] 2 Y-shape connection pipe a = c + c2 c c2 Permissible length (one-way) Permissible height difference (one-way) Number of bends Total piping length b + b2 + a+ a2 + a3 + a4 + a5 + a6 + a7 + a8 [ 5m Farthest piping length (L) b2 + a8 [ 7m (b2 [ 55m, a8 [ 5m) Piping length between outdoor unit and b + b2 [ 55m branch boxes Farthest piping length after branch box (I) a8 [ 5m Total piping length between branch a+ a2 + a3 + a4 + a5 + a6 a7 + a8 [ 6m boxes and indoor units In indoor / outdoor section (H) *2 In branch box / indoor unit section (h) In each branch unit (h2) In each indoor unit (h3) *2 Branch box should be placed with in the level between the outdoor unit and indoor units. H [ 3m (In case of that outdoor unit is set higher than indoor unit) H [ 2m (In case of that outdoor unit is set lower than indoor unit) h + h2 [ 5m h2 [ 5m h3 [ 2m b + a, b + a2, b + a3, b + a4, b + a5, b2 + a6, b2 + a7, b2 + a8 [ 5 Additional charging is not necessary for this unit if the total pipe length (b + b2 + a + a2 + a3 + a4 + a5 + a6 + a7 + a8) does not exceed 4 m. If the total pipe length exceeds 4 m, charge the unit with additional R4A refrigerant according to the permitted pipe lengths in the chart on the next page. After charging the unit with refrigerant, note the added refrigerant amount on the service label (attached to the unit). Refer to the installation manual for more information. OH48D 6

62 <Table > Total piping length (b+ b2 + a+ a2 + a3 + a4 + a5 + a6 + a7 + a8) Additional refrigerant charging amount * Reference (for service) The amount of refilling refrigerant charge 4m or less kg (no need) 8.5kg (8.5 + ) If connecting an indoor unit with [9.52 liquid pipes (model number 7 or more for M-and S-series and model number 6 or more for P-series), the additional refrigerant charging amount in Table must be corrected (add the following R value from the value given in Table ). Additional refrigerant charging correction amount R=. [kg/m] o [9.52 branch pipe (liquid pipe) total length [m] 4 5m 5 7m 7 9m 9 5m.6kg 9.kg ( ).4kg 2.2kg 3.2kg 9.9kg ( ).7kg ( ).7kg ( ) Example) b = 2m, b2 = 25m Indoor unit A Indoor unit B Indoor unit Indoor unit D [9.52 liquid pipe [6.35 liquid pipe [6.35 liquid pipe [9.52 liquid pipe a = 2m a2 = m a6 = 4m a7 = 3m Total piping length : b + b2 + a + a2 + a6 + a7 = 95m According to Table, the additional refrigerant charging amount is 3.2kg. Because indoor units with [9.52 liquid pipes are connected (indoor units A and D in this example), the additional refrigerant charging amount must be corrected. Additional refrigerant charging correction amount R =. [kg/m] o [9.52 branch pipe (liquid pipe) total length (a + a7) =. o (2 + 3m) =.25kg Therefore, the additional refrigerant charging amount is 3.2kg +.25kg = 3.45kg. * Reference The refilling amount of refrigerant at servicing Example) =.95kg The amount of refrigerant of initial charge (8.5kg) is added. * Although two ø6.35 liquid pipes are used between the branch box and the Y-shape connection pipe when connecting the P indoor unit, calculate the additional refrigerant charging amount assuming only one ø9.52 liquid pipe is used Refrigerant collecting (pump down) Perform the following procedures to collect the refrigerant when moving the indoor unit or the outdoor unit. Turn off the circuit breaker. 2 onnect the low pressure side of the gauge manifold to the service port of the gas side stop valve. 3 lose the liquid stop value. 4 Supply power (circuit breaker). * Start-up of the indoor-outdoor communication takes about 3 minutes after the power (circuit breaker) is turned on. Start the pump-down operation 3 to 4 minutes after the power (circuit breaker) is turned. 5 Perform the test run for cooling operation (SW4-: and SW4-2: OFF). The compressor (outdoor unit) and ventilators (indoor and outdoor units) start operating and test run for cooling operation begins. * Only set the SW4- and SW4-2 to if the unit is stopped. However, even if the unit is stopped and the SW4- and SW4-2 are set to less than 3 minutes after the compressor stops, the refrigerant collecting operation cannot be performed. Wait until compressor has been stopped for 3 minutes and then set the SW4- and SW4-2 to again. 6 Fully close the gas stop valve when the pressure reading on the gauge drops.5 -. MPa (approximately.5 -. kgf/cm²) 7 Stop the air conditioner operation. (SW4-: OFF and SW4-2: OFF) 8 Turn off the power supply (circuit breaker). * If too much refrigerant has been added to the air conditioner system, the pressure may not drop to.5 kgf/cm². If this occurs, use a refrigerant collecting device to collect all of the refrigerant in the system, and then recharge the system with the correct amount of refrigerant after the indoor and outdoor units have been relocated. Warning: When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes. The compressor may burst if air etc. get into it. OH48D 62

63 2-3. PREAUTIS AGAINST REFRIGERANT LEAKAGE Introduction R4A refrigerant of this air conditioner is non-toxic and non-flammable but leaking of large amount from an indoor unit into the room where the unit is installed may be deleterious. To prevent possible injury, the rooms should be large enough to keep the R4A concentration specified by ISO 549- as follows. (2) alculate room volumes (m³) and find the room with the smallest volume The part with represents the room with the smallest volume. (a) Situation in which there are no partitions Branch box Outdoor unit Maximum concentration Maximum refrigerant concentration of R4A of a room is.44 kg/k accordance with ISO To facilitate calculation, the maximum concentration is expressed in units of O/K ( kg of R4A per K) Maximum concentration of R4A:.44O/K (ISO 549-) Outdoor unit Direction of refrigerant flow Branch box Indoor unit (b) There are partitions, but there are openings that allow the effective mixing of air. Branch box Outdoor unit Indoor unit All refrigerant of this system will leak out to this room if there is leakage at this indoor unit onfirming procedure of R4A concentration Follow () to (3) to confirm the R4A concentration and take appropriate treatment, if necessary. () alculate total refrigerant amount by each refrigerant system. Total refrigerant amount is precharged refrigerant at ex-factory plus additional charged amount at field installation. Indoor unit Opening Wall Ventilation apparatus (situation in which there are no door openings or in which there are openings above and below doors that occupy at least.5% of the floor area) (c) If the smallest room has mechanical ventilation apparatus that is linked to a household gas detection and alarm device, the calculations should be performed for the second smallest room. Branch box Outdoor unit Note: When single refrigeration system consists of several independent refrigeration circuit, figure out the total refrigerant amount by each independent refrigerant circuit. The smallest room The second smallest room Indoor unit (3) Use the results of calculations () and (2) to calculate the refrigerant concentration: Total refrigerant in the refrigerating unit (O) [ Maximum concentration (O/K) The smallest room in which an indoor unit has been installed (K) Maximum concentration of R4A:.44O/K If the calculation results do not exceed the maximum concentration, perform the same calculations for the larger second and third room, etc., until it has been determined that the maximum concentration does not exceed in each room. OH48D 63

64 3 DISASSEMBLY PROEDURE MXZ-8B4VA MXZ-8B4YA MXZ-8B6VA MXZ-8B6YA PHOTOS & ILLUSTRATI OPERATING PROEDURE. Removing the service panel and top panel () Remove 3 service panel fixing screws (5 2) and slide the hook on the right downward to remove the service panel. (2) Remove screws (3 for front, 3 for rear/5 2) of the top panel and remove it. Photo Top panel fixing screws Top panel Service panel Slide Grille fixing screws Fan grille Front panel Grille fixing screws Service panel fixing screws Photo 2 Front panel 2. Removing the fan motor (MF, MF2) Propeller () Remove the service panel. (See Photo ) (2) Remove the top panel. (See Photo ) (3) Remove 5 fan grille fixing screws (5 2) to detach the fan grille. (See Photo ) (4) Remove a nut (for right handed screw of M6) to detach the propeller. (See Photo 2) (5) Disconnect the connectors, NF and NF2 on controller Nut circuit board in electrical parts box. (6) Remove 4 fan motor fixing screws (5 25) to detach the fan motor. (See Photo 3) Photo 3 Fan Fan motor fixing screws motor Fan motor fixing screws 3. Removing the electrical parts box () Remove the service panel. (See Photo ) (2) Remove the top panel. (See Photo ) (3) Disconnect the indoor/outdoor connecting wire from terminal block. (4) Remove all the following connectors from controller circuit board; fan motor, thermistor <Outdoor pipe>, thermistor <ompressor>, thermistor <Outdoor 2-phase pipe>, thermistor <Outdoor>, high pressure switch, high pressure sensor, low pressure switch, solenoid valve coil <4-way valve> and solenoid valve coil <Hot gas bypass>, solenoid valve coil <Returning oil bypass>. Then remove a screw (4 8) from the valve bed to remove the lead wire. Pull out the disconnected wire from the electrical parts box. <Diagram symbol in the connector housing> Fan motor (NF, NF2) Thermistor <Outdoor pipe> (TH3) Thermistor <ompressor> (TH4) Thermistor <Outdoor 2-phase pipe, Outdoor> (TH7/6) High pressure switch (63H) High pressure sensor (63HS) Low pressure switch (63L) Solenoid valve coil <4-way valve> (2S4) Solenoid valve coil <Bypass valve> (SV) Solenoid valve coil (Returning oil bypass) <Bypass valve> (SV2) (5) Remove the terminal cover and disconnect the compressor lead wire. (6) Remove an electrical parts box fixing screw (4 ) and detach the electrical parts box by pulling it upward. The electrical parts box is fixed with 2 hooks on the left and hook on the right. OH48D 64 Photo 4 Photo: MXZ-8B4/6VA ontroller circuit board (.B.) Electrical parts box Electrical parts box fixing screw Terminal block (TB) Screw Valve bed ompressor (M) Terminal cover over panel (Front) over panel fixing screws

65 OPERATING PROEDURE PHOTOS 4. Removing the thermistor <Outdoor 2-phase pipe> (TH6) () Remove the service panel. (See Photo ) (2) Remove the top panel. (See Photo ) (3) Disconnect the connectors, TH6 and TH7 (red), on the controller circuit board in the electrical parts box. (4) Loosen the clamp for the lead wire in the rear of the electrical parts box. (5) Pull out the thermistor <Outdoor 2-phase pipe> (TH6) from the sensor holder. Photo 5 ontroller circuit board (.B.) Thermistor <Outdoor 2-phase pipe> (TH6) Note: In case of replacing thermistor <Outdoor 2-phase pipe> (TH6), replace it together with thermistor <Outdoor> (TH7) since they are combined together. Refer to No.5 below to remove thermistor <Outdoor>. lamp 5. Removing the thermistor <Outdoor> (TH7) () Remove the service panel. (See Photo ) (2) Remove the top panel. (See Photo ) (3) Disconnect the connector TH7 (red) on the controller circuit board in the electrical parts box. (4) Loosen the clamp for the lead wire in the rear of the electrical parts box. (See Photo 5) (5) Pull out the thermistor <Outdoor> (TH7) from the sensor holder. Note: In case of replacing thermistor <Outdoor> (TH7), replace it together with thermistor <Outdoor 2-phase pipe> (TH6), since they are combined together. Refer to No.4 above to remove thermistor <Outdoor 2-phase pipe>. 6. Removing the thermistor <Outdoor pipe> (TH3) and thermistor <ompressor> (TH4) () Remove the service panel. (See Photo ) (2) Disconnect the connectors, TH3 (white) and TH4 (white), on the controller circuit board in the electrical parts box. (3) Loosen the clamp for the lead wire in the rear of the electrical parts box. (See Photo 5) (4) Pull out the thermistor <Outdoor pipe> (TH3) and thermistor <ompressor> (TH4) from the sensor holder. Photo 6 Lead wire of thermistor <Outdoor> (TH7) Photo 7 Thermistor <ompressor> (TH4) OH48D 65 Sensor holder Thermistor <Outdoor pipe> (TH3) ompressor (M)

66 OPERATING PROEDURE 7. Removing the solenoid valve coil <4-way valve> (2S4) () Remove the service panel. (See Photo ) (2) Remove the top panel. (See Photo ) [Removing the solenoid valve coil <4-way valve>] (3) Remove 4-way valve solenoid coil fixing screw (M5 6). (4) Remove the solenoid valve coil <4-way valve> by sliding the coil toward you. (5) Disconnect the connector 2S4 (green) on the controller circuit board in the electrical parts box. 8. Removing the 4-way valve () Remove the service panel. (See Photo ) (2) Remove the top panel. (See Photo ) (3) Remove 3 valve bed fixing screws (4 ) and 4 ball valve and stop valve fixing screws (5 6) and then remove the valve bed. (4) Remove 4 right side panel fixing screws (5 2) in the rear of the unit and then remove the right side panel. (5) Remove the solenoid valve coil <4-way valve>. (See Photo 8) (6) Recover refrigerant. (7) Remove the welded part of 4-way valve. Note : Recover refrigerant without spreading it in the air. Note 2: The welded part can be removed easily by removing the right side panel. Note 3: When installing the 4-way valve, cover it with a wet cloth to prevent it from heating (2 or more), then braze the pipes so that the inside of pipes are not oxidized. 9. Removing solenoid valve coil <Bypass valve> (SV) and bypass valve () Remove the service panel. (See Photo ) (2) Remove the top panel. (See Photo ) (3) Remove the electrical parts box. (See Photo 5) (4) Remove 3 right side panel fixing screws (5 2) in the rear of the unit and remove the right side panel. (5) Remove the bypass valve coil fixing screw (M4 6). (6) Remove the solenoid valve coil <Bypass valve> (SV) by sliding the coil upward. (7) Recover refrigerant. (8) Remove the welded part of bypass valve. Note : Recover refrigerant without spreading it in the air. Note 2: The welded part can be removed easily by removing the right side panel. Photo 8 Photo 9 4-way valve PHOTOS Solenoid valve coil <4-way valve> (2S4) Solenoid valve coil <4-way valve> fixing screw Solenoid valve coil <Bypass valve> (Returning oil bypass) (SV2). Removing solenoid valve coil (Returning oil bypass) <Bypass valve> (SV2) and bypass valve () Remove the service panel. (See Photo ) (2) Remove the top panel. (See Photo ) (3) Remove the electrical parts box. (See Photo 5) (4) Remove 3 right side panel fixing screws (5 2) in the rear of the unit and remove the right side panel. (5) Remove the bypass valve coil fixing screw (M5 6). (6) Remove the solenoid valve coil (Returning oil bypass) <Bypass valve> (SV2) by sliding the coil upward. (7) Recover refrigerant. (8) Remove the welded part of bypass valve. Solenoid valve coil <Bypass valve> (SV) Bypass valve (SV) Bypass valve (SV2) Note : Recover refrigerant without spreading it in the air. Note 2: The welded part can be removed easily by removing the right side panel. OH48D 66

67 OPERATING PROEDURE. Removing the high pressure switch (63H) and low pressure switch (63L) () Remove the service panel. (See Photo ) (2) Remove the top panel. (See Photo ) (3) Remove the electrical parts box. (See Photo 5) (4) Remove 3 right side panel fixing screws (5 2) in the rear of the unit and remove the right side panel. (5) Pull out the lead wire of high pressure switch and low pressure switch. (6) Recover refrigerant. (7) Remove the welded part of high pressure switch and low pressure switch. Note : Recover refrigerant without spreading it in the air. Note 2: The welded part can be removed easily by removing the right side panel. Note 3: When installing the high pressure switch and low pressure switch, cover them with a wet cloth to prevent them from heating ( or more), then braze the pipes so that the inside of pipes are not oxidized. 2. Removing the high pressure sensor (63HS) () Remove the service panel. (See Photo ) (2) Remove the top panel. (See Photo ) (3) Remove the electrical parts box. (See Photo 5) (4) Remove 3 right side panel fixing screws (5 2) in the rear of the unit and remove the right side panel. (5) Pull out the lead wire of high pressure sensor. (6) Recover refrigerant. (7) Remove the welded part of high pressure sensor. Photo PHOTOS High pressure switch (63H) High pressure sensor (63HS) Low pressure switch (63L) Note : Recover refrigerant without spreading it in the air. Note 2: The welded part can be removed easily by removing the right side panel. Note 3: When installing the high pressure sensor, cover it with a wet cloth to prevent it from heating ( or more), then braze the pipes so that the inside of pipes are not oxidized. OH48D 67