SERVICE MANUAL SPLIT TYPE ROOM AIR CONDITIONERS MODELS INDOOR UNIT GS-XP12HR-N OUTDOOR UNIT AE-X12FR-N. No. XXXXXXXXXXXXX CONTENTS.

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1 TopPage SERVICE MANUAL xxxxxxxxx No. XXXXXXXXXXXXX SPLIT TYPE ROOM AIR CONDITIONERS CEILING TYPE MODELS INDOOR UNIT GS-XPHR-N OUTDOOR UNIT AE-XFR-N In the interests of user-safety (Required by safety regulations in some countries) the set should be restored to its original condition and only parts identical to those specified should be used. FLOOR TYPE CONTENTS CHAPTER. SPECIFICATION [] SPECIFICATION... - [] EXTERNAL DIMENSION... - [] WIRING DIAGRM... - [] ELECTRICAL PARTS... - CHAPTER. EXPLANATION OF CIRCUIT AND OP- ERATION [] BLOCK DIAGRAMS... - [] MICROCOMPUTER CONTROL SYSTEM... - [] FUNCTION... - CHAPTER. TROUBLESHOOTING [] TROUBLESHOOTING GUIDE... - [] THERMISTOR TEMPERATURE CHAR- ACTERISTICS... - [] HOW TO OPERATE THE OUTDOOR UNIT INDEPENDENTLY... - CHAPTER. REFRIGERATION CYCLE [] FLOW FOR REFRIGERANT...- [] STANDARD CONDITION...- [] TEMPERATURE AT EACH PART AND PRESSURE IN -WAY VALVE...- [] PERFORMANCE CURVES...- CHAPTER. DISASSEMBLING PROCEDURE [] DISASSEMBLY OF INDOOR UNIT...- [] DISASSEMBLY OF OUTDOOR UNIT...- Parts Guide Parts marked with " " are important for maintaining the safety of the set. Be sure to replace these parts with specified ones for maintaining the safety and performance of the set. This document has been published to be used for after sales service only. The contents are subject to change without notice.

2 GSXPHRN GSXPHRN CHAPTER. SPECIFICATION Service Manual [] SPECIFICATION. GS-XPHR-N / AE-XFR-N MODEL INDOOR UNIT OUTDOOR UNIT ITEMS GS-XPHR-N AE-XFR-N Cooling capacity (Min. ~ Max.) kw. ( ) Heating capacity (Min. ~ Max.) kw. ( ) Moisture removal (at cooling) Liters/h 0.9 Electrical data Phase Single Rated frequency Hz 0 Rated voltage V 0 Rated current Cool A. (. -.0) (Min - Max.) Heat A. (. -.0) Rated input (Min - Max.) Cool W 900 (00-00) Heat W 90(0-00) Power factor Cool % Heat % 90 Compressor Type Hermetically sealed rotary type Model RS09XDF Oil charge RBA or FREOL ALPHAM 0ml Refrigerant system Evaporator Louver Fin and Grooved tube type Condenser Corrugate Fin and Grooved tube type Control Expansion valve Refrigerant (R0A) 000g De-lce system Micro computer controled reversed systems Noise level (at cooling) High db(a) 9 Low db(a) - Soft db(a) 9 - Fan system Drive Direct drive Air flow quantity (at cooling) High m /min Low m /min. 0. Soft m /min.. Fan Centrifugal fan Propeller fan Connections Refrigerant coupling Flare type Refrigerant tube size Gas, Liquid /", /" Drain piping mm O.D φ 0 Others Safety device Compressor: Thermal protector Fan motors: Thermal fuse Fuse, Micro computer control Polypropylene net (Washable) Air filters Net dimensions Width mm 0 0 Height mm 0 Depth mm 0 Net weight kg NOTE: The condition of star " " marked item are ISO : 99(E), condition T, Voltage.

3 INVERTER AIR CONDITIONER CRMC-AJBE0 R0(AAA) PCS. SHARP CORPORATION [] EXTERNAL DIMENSION GSXPHRN. GS-XPHR-N / AE-XFR-N.. Indoor unit Outdoor unit

4 GSXPHRN.. Installation demensions.. Ceiling type (unit size) 9 9 Hole for drainage pipe (Ø 0mm) (VIEW FROM FRONT) 0 (unit size) 99 (bolt pich) 00 Horizontal base line Hole for refrigerant and drainage pipe (Ø 0mm) (unit size) (VIEW FROM CEILING) 0 Hole for refrigerant and drainage pipe (Ø 0mm) Air outlet Length unit: mm.. Floor type Air outlet (unit size) (VIEW FROM FRONT) Hole for refrigerant and drainage pipe (Ø 0mm) 0 Horizontal base line (bolt pich) 0 (unit size) 9 (unit size) Hole for drainage pipe (Ø 0mm) (VIEW FROM TOP) Hole for refrigerant and drainage pipe (Ø 0mm) Length unit: mm

5 [] WIRING DIAGRM GSXPHRN. Indoor unit.. GS-XPHR-N. Outdoor unit.. AE-XFR-N [] ELECTRICAL PARTS. Indoor unit.. GS-XPHR-N DESCRIPTION MODEL REMARKS Indoor fan motor MLB0 0 -, 0Hz Indoor fan motor capacitor, µf Transformer Primary; AC 0 -, 0Hz Secondary; AC9V, 0Hz FUSE QFS-GA0JBZZ (,.A) FUSE QFS-GA0JBZZ (, A). Outdoor Unit.. AE-XFR-N DESCRIPTION MODEL REMARKS Compressor RS9XDF D.C. brush-less motor

6 GSXPHRN DESCRIPTION MODEL REMARKS Outdoor fan motor ML-A90 DC Motor Fu QFS-GA0JBZZ (, A) Fu QFS-GA0JBE0 (, A) Fu QFS-GA0JBZZ (,.A) Fu QFS-CA00JBZZ (, 0A) Fu, QFS-CA00JBZZ (, A)

7 GSXPHRN CHAPTER. EXPLANATION OF CIRCUIT Service AND OPERATION Manual GSXPHRN [] BLOCK DIAGRAMS. INDOOR UNIT DC power supply circuit Fan motor phase control circuit Room fan motor. A FUSE AC power Rotation pulse input circuit Fan motor pulse detect AC clock circuit Louvre motor drive circuit Flow direction control Remote controller signal reception circuit Wireless remote control operation Buzzer drive circuit Audible operation confirmation CPU reset circuit CPU oscillator circuit CPU Room temp. detect circuit Heat exchanger pipe thermo circuit Room temp. thermistor Heat exchanger pipe thermistor Compensation circuit/ select circuit Model select Switchover circuit Wireless, preheat, auto restart Serial I/O circuit Compressor relay drive circuit LED drive circuit Indoor/outdoor control signal I/O Outdoor unit power supply on/off control LED display Unit-unit wiring (AC power and serial signals) Auto restart circuit Test run circuit Test run (forced operation) Auxiliary mode Auxiliary mode button ON/OFF Power on circuit Self diagnostics, fault diagnosis Cluster generator drive circuit Cluster generator Cluster generator sensor circuit

8 GSXPHRN. OUTDOOR UNIT AC clock circuit Pulse amplitube modulation circuit Power supply circuit Smoothing circuit IGBT A protection Power factor converter circuit Filter circuit 0A protection Unit-unit wiring (AC power and serial signals) CPU oscillator circuit DC overvoltage detection circuit Outdoor fan drive circuit Outdoor fan.a protection -way valve relay drive circuit DC overcurrent detection circuit Power transistor module drive circuit -way valve Power transistor module A protection CPU Serial I/O circuit CPU reset circuit Position detection circuit Compressor AC overcurrent detection circuit Compressor thermo circuit Heat exchanger pipe thermo circuit Outdoor temp. thermo. circuit Current transformer Compressor thermistor Heat exchanger pipe thermistor Outdoor temperature thermistor EEPROM LED drive circuit Test mode circuit LED Expansion valve drive circuit Suction temp. thermo. circuit -way valve temp. thermo. circuit Expansion valve Suction pipe thermistor -way valve thermistor

9 GSXPHRN [] MICROCOMPUTER CONTROL SYSTEM. INDOOR UNIT.. Electronic Control Circuit Diagram NO. CN0, C, R, R CN0, CN, D0, D, D, JP JP JP JP JP JP JP JP NONE NONE NONE NONE K NONE NONE JP USE USE NONE USE USE USE USE USE GS-XPHR NF0, CLUSTER, TH R R R JP99 R R0 Q V BLUE BLACK BLUE PURPLE GRAY RED WHITE BLACK RED YELLOW GREEN / BROWN BCN D RY IN OUT BCN UNIT OUTDOOR TO TERMINAL N BOARD TERMINAL BOARD N L POWER SUPPLY 0000p 00p G S 0.μ 0.μ 0.μ 0.μ FUSE RESET MO 9 GND OE SERIAL CLOCK V BUSY SSR 00K 0.0μ + K K K PC PC -V 0.μ 0K.K 0.0μ 0.μ 0.μ V 0.K IC M0 ** P P P P P 0 9 P P P0 P P P P P P P P0 P P P CNVss (Vpp) RESET P P0 Xin Xout Vss P P P P P 0 P P P0 P P 9 0 P P P P P0 Vcc Vref AVss P P P P P P P P P P P P0 P0 P0 P0 P0 P0 P0 P0 P00 μ IC 0.μ M OSC V TH TH PIPE TMEP. (ºC) TEMP VALVE 0.μ + 0K 0K 0K.K 00μ 0.0μ 0.0μ 0.μ 0 L 0.0μ W SSR μ V BZ 0.μ V 0.μ.K 0.W CLUSTER 0K L CN0 (XA) (XA) (XH) CN0 (XH) (XH) (PH) CN 0 CN 0 0K + 0K 0K + ROOM TMP..K (SM) RECEIVER BOARD UNIT DISPLAY BOARD UNIT B A FAN CAPACITOR MOTOR ) ( DRAIN PUMP 0 0 W W 0 0 W W 0 R R9 R0 R R W PCH PCX.K R0 R NF0 C 0.0μ D μ μ C W W.K ZD R R R C0 R9 R0 C C C C R C C R9 R9 R9 R9 R9 R9 0 C0 C0 R0 R0 LED0 CN0 R0 R0 R0 C C C R00 0K R99 R9 R0 C0 C9 C R0 C C C C9 Q R0 RY Q C9 R R R R R R R R R D R R D C C C R R R9 R Q0 D 0K R D R0 C D0 R9 D R C D C R9 C C R C RY R μ (PH) CN /W IC V 9 0μ V + 0K 0μ V V 0μ 0K + +.KF V /W 0.0μ 00 W FAN MOTOR IC PROTECTOR THERMAL (VH) N CN CN CN CN CN CN CN CN CN K MODEL CN 0.μ + μ 0K 9 9 (PH) 0 CN CN 0 /W (XA) CN0 (XH).K.K IC 0.μ K K POWER ON K JP99 CLUSTE PLASMA TIMER OPERAT /W /W /W IC0 SW0 LED0 LED0 BL HALL NC NC NC R0 + NC 000p D 0K BLACK BROWN BLUE NR NR /FLOOR CEILING MULTI / SINGLE FILTER AUX. (TEST RUN) JP.K R K C V V V Q0 Q NC NC NC NC (PREHEAT) CN0 R0.K TIME REDUCE JP R K (SPARE) R K R0 R R0 R9 JP JP JP AUTO RES. HOT KEEP WIRELESS K K K V 0.0μ C CON. REMOTE SELECT JP SW D R Q V GND V C + 00μ R C9.K R C0 C C C D C TR 0.μ D ~ IC 0.μ 0 μ + IC 0.μ 000μ + K K IN OUT IN JP R R Q V 0.0μ 0K C, : C, : C C C C SINGLE PHASE.0μ (TH) (CN99) R M (VH - WHITE) GREEN) (XA - ATTACH - MENT DUMMY ) ( ( ) FLOAT DRAIN SWITCH JP (CLUSTER) NF0 CN0 CN0 00K R Q9 R 0 SSR V W K K R R μ W W R R.K.K R.K.K W W R SSR C R.K K.K (PH) LOUVER MOTOR 0 CN 0 CN.KF 0KF NC NC.A SA OUT

10 GSXPHRN.. Printed Wiring Board to "" OF TB from "L" OF TB from PIPE THERMISTOR from ROOM THERMISTOR from DRAIN PUMP(OPTION) (GREEN CONNECTOR) or SHORTEN CIRCUIT ATACHMENT} from CLUSTER UNIT (LEFT) from FAN MOTOR from FAN MOTOR to LOUVER M to CONTROL BOX to "L" OF TB to "" OF TB to "N" OF TB to FAN M CAPACITOR from DRAIN PUMP (WHITE CONNECTOR) (OPTION) }

11 TR D D C9 0μ D R9.K C 0μ C0 0μ R 0K R 0K R 0K R.K C 0.μ V - P R K R W IC 0. OUTDOOR UNIT GSXPHRN.. Electronic Control Circuit Diagram IC R9 0K b a M FU A 0 0.μ CN C9 R.KJ R 0K C μ R 9.KF R.K Q0 KRA0S C 0.0μ CN RY IC KID00AP 0K 0K C9 0.μ j c JP JP JPF C9 R K W 00μ C R K R K U V C C 000P x C9 0.μ 9 - P Q T S D0 JP0 R 0 IC PST99D R 0 R9 00 C 0.μ C μ R Q Q9 KRC0S 0 EXPANSION VALV COIL V MRY V R9 R9 IC CNE (EEPROM CIRCUIT) R R0.K R R.K K 0K C 0.μ C 0μ C9 000P C0 000P R ST Q C 000P C 000P (LED CIRCUIT) R 00 C R P R 00 C R P R 00 R K R 0K C 0.μ C 0.μ C 00μ RA, A /W x D IPM VUFB C0 00μ D9 C9 0.μ VUFS VPI UP C 00μ D0 C 0.μ 0 VVFB VVFS VPI VP C 00μ C 0.μ VWFB VWFS VPI WP VNI C 0.μ C C 0.μ 0.μ UN VN WN VNC F0 9 9 ZD R0 0 PC TLP Q KRC0S IPM C9 000P R9 W 0.0 0K R00 R ~ /W 0KF x 0Kx R~ 0.0μ x C ~ 9 C0~ V 0μ x TH TH TH TH 0 CN j c 9 j IC STR -L FU A C KV 0PF C 0μ R.K 9 R /W M R9 /W M R0 /W M R0 0 CF0 CIN Vcc ~ Drain GND OCP/FB Source 0 9 R 0 0P C R. R..K R0 SAG ZD Q C 00P D C 0P D D R /W M R /W M R /W M R W 0 D R9 K PC PCNIP 0.0μ C TERMINAL BOARD N BLUE BROWN GREEN/ YELLOW T T T T /W M R μf L L R 0K C /W C C SA NR μf R 0K /W μf CT R9 R 00K FU.A T GR IN PTC MRY e d OUT D R90.0KF GR GR WH WH R9 R.KF 0K R0 K Q KRC0S R0.K C 000P C9 0μ T DB DB Q R.K V -P FC 00pF C CA C CA 00pF 00pF C CA C CA 00pF FC C 00P D C 0.μ R.K W W W K K K (SERIAL I/O CIRCUIT) R0, 0 /W K x R0 R0 R0 R0 R0, 0 W K x T0 T R 00 R 00 R9 00 R K R99 00 R 0.KF R 0.KF C 0.0μ IC KIA9 0 C 0.μ C 0P C 0.μ C0 0.μ R 0.KF 9 C9 0.0μ RED T FB FU 0A T R R FU A U V W N C0 00μ C9 0.μ D PS or JP JP JP9 N e d NR JP R R RY C R /W 0.0μ 0 CN N R C K 000P (PAM OVER CURRENT CIRCUIT) R9 0K P0 P0 P P P P P P P P0 P P P P P P P VSS P0 (U) MD0 P P P P0 AVSS AVR AVCC P P P P P P P P0 P P P 0K 0K OSC MHz RST MD MD X0 X P VSS P P00 P0 IC VCC P0 (B) (Z) P P0 (O) (W) P P0 (Y) (Y) P P0 (W) (V) P P0 (X) P P P P P0 R R 0K 0K (CN) R LED.K R 00 C 000P JP 0 VNO C N (U) (V) (W) R 0K R.K FC FC U V W T T T9 R (C) R ~ D.KF x S EARTH YELLOW GREEN/ C (R) R, /W x R.K R.K R0.K.K R D D PC PCXP R.K R M D -P PC PCHXP R K R.K a C 000P b D D C 0.0μ R0.KF ZD -WAY VALV COIL R K C 0.0μ R.KF C 0.μ V.kF FU A R R /W /W C KF 0KD + C9 + C0 R 0.μ /W R /W 0μ 0μ 00KF 0KD M R R.KF R R KF.KF KF P.KF R C C 0P 0P (ROTOR POSITION DETECT CIRCUIT) R 9.KF (RESET CIRCUIT) (SWITCHING POWER SUPPLY CIRCUIT) C 0.μ (FAN MOTOR) Q KRA0S KRC0S C 000P ( - WAY VALVE CIRCUIT) (FOR DEBUG) MONITOR (FAN MOTOR CIRCUIT) (THERMISTOR CIRCUIT) (FRASH WRITER CONNECTOR) CND (DC OVERCURRENT CHECK CIRCUIT) (THERMISTOR) C +

12 GSXPHRN.. Printed Wiring Board

13 [] FUNCTION GSXPHRN. INDOOR UNIT.. Startup control The main relay remains off during the first seconds (first safety time) immediately after the power cord is plugged into an AC outlet in order to disable outdoor unit operation and protect outdoor unit electric components... Restart control Once the compressor stops operating, it will not restart for 0 seconds to protect the compressor. Therefore, if the operating compressor is shut down from the remote control and then turned back on immediately after, the compressor will restart after a preset delay time. (The indoor unit will restart operation immediately after the ON switch is operated on the remote control.) Compressor operation Compressor ON OFF operation on remote control.. Temperature Adjustment.. Cooling When the room temperature is higher than the preset temperature by C or more, the unit runs at the maximum operation frequency until the temperature comes down to the preset temperature. When reaching the preset temperature, the unit runs at the frequency calculated by the fuzzy operation and switches to the normal control... Heating When the room temperature is lower than the preset temperature by. C or more, the unit runs at the maximum operation frequency until the temperature comes down to the preset temperature. When reaching the preset temperature, the unit runs at the frequency calculated by the fuzzy operation and switches to the normal control... Dry After operation begins, minutes of the room temperature is stored in memory, and that becomes the set value... Indoor fan control.. Cooling The fan speed can be selected from Auto, Soft, Low,and HIgh.When Soft, Low or HIgh is selected, the fanspeed is constant regardless of the room temperature.when Auto is selected, the fan speed automatically changes between Soft and HIgh depending on the difference between the room and preset temperature. Control for indoor freezing prevention If the temperature of the indoor heat exchanger stays below approximately 0 C for minutes during cooling or dry, this control stops the compressor. Over C the compressor will run again... Heating Compressor remains OFF for 0 seconds ON operation on remote control Compressor can turn ON Compressor ON Control for cold air blowing prevention When heating begins, this control stops the indoor fan until the temperature of the indoor heat exchanger reaches C. It also stops the fan if the temperature goes below C during operation... Automatic operation The operating mode and temperature setting are determined by the room temperature and the external air temperature. The operating mode will changeover automatically with the following condition. 9 ) From cooling to heating Cooling mode will changeover to heating mode when condition of indoor temperature. C lower than the set temperature conditions for minutes. ) From heating to cooling Heating mode will change over to cooling mode when condition of indoor temperature. C higher than the set temperature conditions for minutes under compressor off condition. ) When the set temperature is adjusted within the range of ± C by the remote control s key. ( ), the changeover judgement room temp. will also be shifted within the range of ± C... ON-timer The ON-timer is set by pressing the ON-timer button. In order to attain the set temperature at the set time... OFF-timer The OFF-timer is set by pressing the OFF-timer button. Operation is as follows: Cooling Heating Dry ºC * During Heating Temperature of the indoor heat exchanger Preset Fan speed The indoor fan operates at low speed. The indoor fan stops. ºC Cooling (ºC) Heating Heating (ºC) (ºC) Room temperature (ºC) Cooling (ºC) Cooling (ºC) (Dry) (Room temperature -ºC) Set temperature By fuzzy computing Set the shift up time Final Cooling setting + C Heating setting - C Same as above (Final setting + C) Cooling (ºC) ºC ºC Outdoor temperature (ºC) 0 0 Cooling (ºC) Heating (ºC) Cooling (ºC) When the cooling operation only can use winter kit Timer set time ºC Room temperature hour Timer operation starts Stops

14 GSXPHRN * During Cooling / Dry hour.. Swing louvre The louvre is moved by a stepping motor to perform swing and fixing in the set position. If the FLOW DIRECTION button is prossed during swing, it will stop. If the FLOW DIRECTION button is pressed while it is stopped, it will swing. The vertical adjustment louvre will change its angle continuously. Press the SWING button again when the vertical adjustment louvre is at the desired position. The louvre will stop moving within the range shown in the diagram. The adjusted position will be memorized and will be automatically set to the same position when operated the next time..9. One-hour operation If this button is pressed when operation is stopped, operation will begin and then stop after hour. If pressed when it is operating, will stop after one hour..0. Full power operation Immediately begins cooling or heating at maximum power and air flow. (During heating) Operates at setting of C. (During cooling) Operates at setting of C... Power ON start ºC Timer operation starts COOL and DRY modes Floor standing Ceiling suspended Timer set time Adjustment range The adjustment range is narrower the SWING range in order to prevent condensation from dripping. Room temperature Stops HEAT mode Floor standing Ceiling suspended The range is wide so the air flow can be directed toward the floor. If a jumper wire is inserted into the place indicated JP99 on the indoor control board, and the power plug is inserted. cooling or heating will be automatically determined by the room temperature sensor on the main unit, and operation will begin... Auto Restart When power failure occures, after power is recovered, the unit will automatically restart in the same setting which were active before the power failure. Operating mode (Cool, Heat, Dry) Temperature adjustment (within C range) automatic operation Temperature setting Fan setting Air flow direction Power ON/OFF Automatic operation mode setting Swing louver Plasmacluster operation mode Setting not memorized Timer setting Full power setting.. Error diagnostic display Indoor unit ) If the operation is stopped and the emergency operation button is pressed down for seconds or more, the self-diagnosis memory can be recalled. ) Details of self-diagnosis (error mode) are informed by the flashing number as well as the lighting pattern of the operation lamp which flashes with the timer lamp.(for details, refer to Error diagnostic method.).. Compressor relay ) It is ON during operation, and when operation is stopped, goes OFF after a delay of 0 seconds (not immediately). Air conditioner operation Compressor relay ) The minimum OFF time of the relay is 0 seconds. It will not go ON again before 0 seconds elapses. Air conditioner operation Compressor relay ON ) If air conditioner operation is turned on again during the 0 second delay before the compressor relay goes off, the compressor relay will stay on. Air conditioner operation Compressor relay ON ON ON ON ON.. Drain water control (option) When the float switch turns OFF (full level), the drain pump is forcibly operated for minutes. After the pump operates for minutes, the pump turns OFF if the float switch is ON (empty). If the float switch is not ON (empty) even when minutes elapse from the time of pump ON, the equipment stops operating due to a drain pump error... Plasmacluster Ion function OFF OFF 0 sec. 0 sec. 0 sec. ON OFF 0 sec. OFF Operating the Plasmacluster Ion button while the air conditioner is in operation or in non-operation allows the switching of the operation mode in the following sequence: Air Clean operation Stop. Self Clean operation generates about equal amounts of (+)ions and (-)ions from the cluster unit to provide clean air. ON ON OFF

15 If the Plasmacluster Ion generation function is operated together with the air conditioner operation, the indoor unit fan speed and louver direction are in accordance with the air conditioner settings. GSXPHRN If the Plasmacluster Ion generation function is used without operating the air conditioning function, the indoor unit fan operates at a very low speed and the upper louver is angled upward and the lower louver remains horizontal. (The airflow volume and direction can be changed by using the remote control.). OUTDOOR UNIT.. Outdoor unit -way valve freeze prevention control If the temperature of the outdoor unit -way valve remains below 0 C for 0 consecutive minutes during cooling or dehumidifying operation, the compressor operation stops temporarily in order to prevent freezing. When the temperature of the -way valve rises to 0 C or higher after about 0 seconds, the compressor restarts and resumes normal operation... Indoor unit overheat prevention control During heating operation, if the temperature of the indoor unit heat exchanger exceeds the indoor unit heat exchanger overheat prevention temperature (about to C) which is determined by the operating frequency and operating status, the operating frequency is decreased by about to Hz. Then, this operation is repeated every 0 seconds until the temperature of the indoor unit heat exchanger drops below the overheat protection temperature. Once the temperature of the indoor unit heat exchanger drops below the overheat protection temperature, the operating frequency is increased by about to 0 Hz every 0 seconds until the normal operation condition resumes. If the temperature of the indoor unit heat exchanger exceeds the overheat protection temperature for 0 seconds at minimum operating frequency, the compressor stops operating and then restarts after about 0 seconds, and the abovementioned control is repeated... Outdoor unit overheat prevention control During cooling operation, if the temperature of the outdoor unit heat exchanger exceeds the outdoor unit heat exchanger overheat prevention temperature (about C), the operating frequency is decreased by about to Hz. Then, this operation is repeated every 0 seconds until the temperature of the outdoor unit heat exchanger drops to about C or lower. Once the temperature of the outdoor unit heat exchanger drops to about C or lower, the operating frequency is increased by about to 0 Hz every 0 seconds until the normal operation condition resumes. If the temperature of the outdoor unit heat exchanger exceeds the outdoor unit heat exchanger overheat protection temperature for (0 sec : outdoor temperature 0 C 0 sec : outdoor temperature < 0 C) at minimum operating frequency, the compressor stops operating and then restarts after about 0 seconds, and the abovementioned control is repeated... Compressor overheat prevention control If the temperature of the compressor exceeds the compressor overheat prevention temperature (0 C), the operation frequency is decreased by about to 0 Hz. Then, this operation is repeated every 0 seconds until the temperature of the compressor drops below the overheat protection temperature (00 C). Once the temperature of the compressor drops below the overheat protection temperature, the operating frequency is increased by about to 0 Hz every 0 seconds until the normal operation condition resumes. If the temperature of the compressor exceeds the overheat protection temperature (for 0 seconds in cooling operation or 0 seconds in heating operation) at minimum operating frequency, the compressor stops operating and then restarts after about 0 seconds, and the abovementioned control is repeated... Peak control If the current flowing in the air conditioner exceeds the peak control current (see the table below), the operation frequency is decreased until the current value drops below the peak control current regardless of the frequency control demand issued from the indoor unit based on the room temperature. Model Peak control current Cooling operation Heating operation GS-XPHR-N Approx.. A Approx.. A.. Outdoor unit fan delay control The compressor stops immediately after cooling, dehumidifying or heating operation is shut down, but the outdoor unit fan continues operation for 0 seconds before it stops... Defrosting.. Reverse defrosting The defrost operation starts when the compressor operating time exceeds 0 minutes during heating operation, as shown below, and the outside air temperature and the outdoor unit heat exchanger temperature meet certain conditions. When the defrost operation starts, the indoor unit fan stops. The defrost operation stops when the outdoor unit heat exchanger temperature rises to about C or higher or the defrosting time exceeds 0 minutes. 0 min or more 0 min or more 0 min or more Start of heating operation Defrosting Max. 0 min Defrosting Max. 0 min.. Winter cool Cooling operation is available during the winter season by the built in winter cool function. Lower limit of outdoor temperature range is -0 C DB. When the outside air temperature is low, the outdoor unit fan operates at slower speed. NOTE: Built-in protect device may work when outdoor temperature falls below C DB., depending on conditions. 9

16 GSXPHRN. Explanation of cluster circuit The cluster unit generates cluster ions, which are circulated throughout the room by the air flow created by the blower fan (indoor unit fan motor) in the air conditioner unit. ) When microcomputer output turns "H," the IC output changes to "Lo," turning ON the SSR and applying 0 V to the cluster unit for the generation of cluster ions (positive and negative ions). AC Microcomputer output IC R R R0 V SSR R C RE RH Cluster unit. Outline of PAM circuit.. PAM (Pulse Amplitude Modulation) The PAM circuit varies the compressor drive voltage and controls the rotation speed of the compressor. The IGBT shown in the block diagram charges the energy (electromotive force) generated by the reactor to the electrolytic capacitor for the inverter by turning ON and OFF. Reactor L DB AC Noise filter Reactor L + IPM Compressor AC clock detection circuit DB IGBT IGBT drive circuit Overvoltage detection circuit Compressor position detector [PAM drive circuit] Microcomputer (IC) PAM drive circuit block diagram 0

17 GSXPHRN When the IGBT is ON, an electric current flows to the IGBT via the reactor (L), (L) and diode bridge (DB). When the IGBT turns OFF, the energy stored while the IGBT was ON is charged to the voltage doubler capacitor via the diode bridge (DB). As such, by varying the ON/OFF duty of the IGBT, the output voltage is varied. DB Stored energy IGBT ON L Reactor L DB IGBT OFF IGBT.. High power factor control circuit This circuit brings the operating current waveform closer to the waveform of commercial power supply voltage to maintain a high power factor. Because of the capacitor input, when the PAM circuit is OFF, the phase of the current waveform deviates from the voltage waveform as shown below. To prevent this deviation, a current is supplied during the periods indicated by "O" in the diagram. To determine the length of period to supply a current, the zero-cross timing of the AC input voltage is input to the microcomputer via the clock circuit. The power source frequency is also determined at the same time. The IGBT turns ON after the time length determined by the zero-cross point to supply a current to the IGBT via the reactor. This brings the current waveform closer to the voltage waveform in phase. As described above, the ON/OFF operation of the IGBT controls the increase/decrease of the compressor power supply voltage (DC voltage) to improve the compressor efficiency and maintain a high power factor by keeping the current phase closer to that of the supply voltage. AC voltage waveform AC voltage waveform AC current waveform AC current waveform Zero-cross detection AC voltage and current waveforms when PAM is OFF IGBT ON period AC voltage and current waveform when PAM is ON.. Detailed explanation of PAM drive circuit sequence AC voltage waveform Clock IGBT ON A B C 0Hz A B.mS.mS C 0..mS.. AC clock (zero-cross) judgment The clock circuit determines the time from one rising point of the clock waveform to the next rising point. The detected clock waveform is used to judge the power source frequency (0Hz). The zero-cross of the AC voltage is judged as the rising of the clock waveform, as shown in the diagram above... IGBT ON start time (delay time B) Based on the zero-cross of the AC voltage, the IGBT turns ON after a delay time set according to the power source frequency... IGBT ON time (C) After the above delay time, the IGBT turns ON to supply a current to the reactor. The ON time of the IGBT determines the amount of energy (level of DC voltage rise) supplied to the reactor. DC voltage level in each operation mode (varies depending on external load conditions) Cooling operation to 0 V Heating operation to 0 V

18 GSXPHRN.. PAM protection circuit To prevent excessive voltage of PAM output from damaging the IPM and electrolytic capacitor as well as the control printed circuit board (PCB), this circuit monitors the PAM output voltage and turns off the PAM control signal and PAM drive immediately when an abnormal voltage output is generated. At the same time, it shuts off the compressor operation. The PAM output voltage is distributed to pin () of the comparator (IC). If this voltage exceeds the reference voltage at pin () of the IC, the output of the comparator (IC) reverses (from H to L) and it is input to pin () of the microcomputer (IC) to halt the PAM drive. 0uF C9 C0 R K R 00K R.K R.K R K R 9.KF R M IC (Overvoltage detection) R.K R K IC During abnormal voltage output The protection voltage level is as follows... Details of troubleshooting procedure for PAM ) PAM shutdown due to error ) When the DC voltage detection circuit sends a signal exceeding the specified voltage to the microcomputer DC voltage of 0 V or higher (detection circuit input voltage of about 9. V or higher) [IC pin ()] When an error is detected PAM IGBT turns OFF. Compressor turns OFF. All units shut down completely when the error occurs four times. ) When the outdoor unit clock waveform differs from the specified value immediately before the PAM IGBT turns ON When there is no clock waveform input When a clock signal of other than specified power source frequency (0/0 Hz) is input When an error is detected PAM IGBT does not turn ON. Compressor operates normally. Complete shutdown does not occur. ) PAM error indication In case of error ) An error signal is sent to the indoor unit as soon as an error is generated. Malfunction No. -0 is indicated when the error code is called out by the indoor unit's self-diagnosis function. The LED on the outdoor unit flashes times when an error is generated. The LED continues flashing in the -time cycle even after the compressor stops operating. The LED turns off (data is deleted from the memory) when the outdoor unit power is turned off. In case of error ) An error signal is sent to the indoor unit as soon as an error is judged. Malfunction No. - is indicated when the error code is called out by the indoor unit's self-diagnosis function. The LED on the outdoor unit flashes times when an error is judged. The LED on the outdoor unit flashes in normal pattern when the compressor stops operating. (Compressor OFF or Thermostat OFF from remote control) * When a user complains that the air conditioner does not provide sufficient cool air or warm air In addition to conventional error-generating reasons, there is a possibility that the PAM IGBT does not turn ON even if the compressor is operating. In that case, the DC voltage does not rise even though the compressor is operating, and lowers to the 0-VDC level. Check items Clock circuit check PAM IGBT check Fuse (Fu) open-circuit check. Explanation of IPM drive circuit The IPM for compressor drive is made by Mitsubishi Electric. The power supply for the IPM drive, the shunt resistance for overcurrent detection, etc., are provided outside the IPM (control PCB).

19 .. IPM drive power supply circuit The power supply for the upper-phase IGBT (HU, HV, HW) drive employs a bootstrap system, and provides power to the upper-phase IC. The -V power supply for the lower-phase IC is provided by the control printed circuit board (PCB)... Brief explanation of bootstrap system (single power drive system) GSXPHRN To supply power to the upper-phase IC, the microcomputer (IC) turns ON the lower-phase IGBT (LU, LV, LW). This results in a charging current that flows to the electrolytic capacitor of each upper-phase IC input and charges the bootstrap capacitor with a -V current. The power supply for the subsequent stages is charged while the lower-phase IGBT is ON in ordinary compressor drive control. Initial charge period Charging current group P(Vcc) Bootstrap capacitor VDB (HU,HV,HW) HVIC High-voltage-withstanding, high-speed recovery diode U,V,W, VD (LU,LV,LW) LVIC N-side IGBT VCIN(n) N(GND Bootstrap circuit

20 GSXPHRN.. DC overcurrent detection circuit When a current of about A or higher flows through the shunt resistance (R9) on the control printed circuit board (PCB), the voltage at this resistance is input to IPM CIN pin (). Then, the gate voltage of the lower-phase IGBT (LU, LV, LW) inside the IPM turns OFF to cut off the overcurrent. At the same time, an L output of about. ms is generated from IPM Fo pin (), and this results in an L input to overcurrent detection input pin () of the microcomputer (IC) and turns OFF the PWM signal output (IC pins () through ()) to the IGBT gate. Protection circuit status SET RESET (Lower phase) Internal IGBT gate (About A) SC a Output current Ic (A) SC reference voltage Sense voltage relative to shunt resistance Delay by CR time constant circuit Error output Fo About. ms P Shunt resistance Overcurrent R9 N IC IPM overcurrent detection circuit CiN FO. 0 energizing control (digital position detection control) This control system detects the digital position detection signal and adjusts the rate of acceleration/deceleration accordingly. The motor's induced voltage waveform is input to the comparator in the form of PWM-switched pulse waveform, and a position detection signal is generated as a reference voltage equaling / of 0 VDC. However, since there is no induced voltage waveform when the PWM waveform is OFF, the microcomputer performs internal processing so that detection is enabled only when it is ON. Based on the detected position signal, actual PWM waveform output timing is determined. Since it does not use a filter circuit, the detection accuracy is high.

21 GSXPHRN The microcomputer performs internal processing to cancel spike voltage during the regenerative process. Furthermore, even if the induced voltage is low, position detection is still possible, thus allowing sensor-less operation at low rotation speed in the initial stage of operation. This reduces the starting current and improves the IPM reliability. Terminal voltage waveform Reference voltage (/ of DC voltage) Spike voltage (cancelled) Comparator output waveform (Position signal waveform)

22 GSXPHRN CHAPTER. TROUBLESHOOTING [] TROUBLESHOOTING GUIDE Service Manual GSXPHRN. SELF-DIAGNOSIS FUNCTION AND DISPLAY MODE ) To call out the content of the self-diagnosis memory, hold down the emergency operation button for more than five seconds when the indoor unit is not operating. a) According to the content of the self-diagnosis memory, the Operation LED (main category) and the Plasmacluster Ion LEDs (sub-category) flash in sync with the Timer LED on the indoor unit. b) In the event a complete shutdown occurs due to a malfunction, the Operation LED (red), Timer LED (yellow) and Plasmacluster Ion LED (blue) flash to indicate the general information of the generated malfunction. c) If the power cord is unplugged from the AC outlet or the circuit breaker is turned off, the self-diagnosis memory loses the stored data. ) Display of detailed self-diagnosis result with main category and sub-category indications When malfunction information is called out, the main category and sub-category of the self-diagnosis result are indicated by the Operation, Timer, and Plasmacluster Ion LEDs on the indoor unit. * :Example of self-diagnosis result displayed on indoor unit: Suction thermistor open-circuit error *: Example of self-diagnosis result displayed on indoor unit: Suction thermistor open-circuit error Timer LED [yellow] Operation LED [red] ON OFF ON OFF Basic flashing cycle due to error sec sec sec sec Figures in ( ) indicate numbers (binary notation) assigned based on the flashing sequence. Flashing for main category indication Main category Malfunction No. Sub-category Plasmacluster Ion LED [blue] Flashing for sub-category indication * :The self-diagnosis display function of the outdoor unit indicates the error information by flashing LED on the outdoor unit according to the content of self-diagnosis. The self-diagnosis display function of the outdoor unit is active only for about to 0 minutes after self-diagnosis is performed during operation, and the display returns to normal condition after this display period. The content of self-diagnosis cannot be called out by the self-diagnosis display function of the outdoor unit. Example of self-diagnosis display on outdoor unit : Compressor high-temperature abnormality ON OFF sec sec 0. sec sec 0. sec sec sec sec 0. sec sec 0. sec sec sec * :The content of diagnosis is transferred to the indoor unit via serial communication, but it does not trigger a complete shutdown operation. : Flashes in -sec intervals (normal), : On, : Off, : Flashes times in 0.-sec intervals (When LED on the outdoor unit flashes in -sec intervals, the outdoor unit is in normal condition.) Status of indoor/outdoor units Indoor/outdoor units in operation Indoor/outdoor units in complete shutdown Indoor/outdoor units in complete shutdown Indoor unit in operation Outdoor unit in temporary stop Indoor unit in operation Outdoor unit in temporary stop Indication by LED on outdoor unit * Normal flashing time times times Indication by operation lamp on indoor unit Malfunction No. Lighting pattern at the time of timer lamp lighting Main Subcategory Off for seconds category Main category Outdoor unit thermistor short-circuit Cycle Compressor hightemperature temperature error Dry operation Content of diagnosis Normal Sub-category Heat exchanger thermistor short-circuit error Outside temperature thermistor short-circuit error Suction thermistor short-circuit error -way valve thermistor short-circuit error Temporary stop due to compressor discharge overheat * Inspection location/method () Measure resistance of the outdoor unit thermistors. (TH to TH: Approx.. k at ¼C) () Check the lead wire of the outdoor unit thermistor for torn sheath and shortcircuit. () No abnormality found in above inspections () and (). () Check the outdoor unit air outlet for blockage. () Check if the power supply voltage is 9V or higher at full power. () Check the pipe connections for refrigerant leaks. () Measure resistance of the outdoor unit compressor thermistor. (TH: Approx. k at ¼C) () Check the expansion valve for proper operation. (Temporary stop for cycle protection) Temporary stop due to (Temporary stop for cycle protection) outdoor unit heat exchanger overheat * Temporary stop due to outdoor unit heat exchanger overheat * temporary stop due to -way valve freeze * Temporary stop due to dehumidifying operation * (Temporary stop for cycle protection) (Temporary stop for cycle protection) (Temporary stop for cycle protection) Remedy () Replace the outdoor unit thermistor assembly. () Replace the outdoor unit thermistor assembly. () Replace the outdoor unit control PCB assembly. () Ensure unobstructed air flow from the outdoor unit air outlet. () Connect power supply of proper voltage. () Charge the specified amount of refrigerant. () Replace the outdoor unit compressor thermistor assembly. () Replace the expansion valve coil, expansion valve or outdoor unit control PCB assembly.

23 GSXPHRN : Flashes in -sec intervals (normal), : On, : Off, : Flashes times in 0.-sec intervals (When LED on the outdoor unit flashes in -sec intervals, the outdoor unit is in normal condition.) Status of indoor/outdoor units Indoor/outdoor units in complete shutdown Indoor/outdoor units in complete shutdown Indication by LED on outdoor unit * times times Indication by operation lamp on indoor unit Malfunction No. Lighting pattern at the time of timer lamp lighting Main Subcategory Off for seconds category Main category Outdoor unit thermistor open-circuit Outdoor unit DC Content of diagnosis Sub-category Heat exchanger thermistor open-circuit error Outside temperature thermistor open-circuit error Suction thermistor open-circuit error -way valve thermistor open-circuit error Discharge thermistor open-circuit error DC overcurrent error IPM pin level error Inspection location/method () Check connector CN of the outdoor unit thermistor for secure installation. () Measure resistance of outdoor thermistors TH to TH. () Check the lead wires of thermistors TH through TH on the outdoor unit control PCB for open-circuit. () No abnormality found in above inspections () through (). () IPM continuity check () Check the IPM and heat sink for secure installation. () Check the outdoor unit fan motor for proper rotation. () No abnormality found in above inspections () through (). () No abnormality found in above inspections () through (). Check the IPM is attached correctly to the outdoor unit control PWB Remedy () Correct the installation. () Replace the outdoor unit thermistor assembly. () Replace the outdoor unit thermistor assembly. () Replace the outdoor unit control PCB assembly. () Replace the outdoor unit control PCB assembly. () Correct the installation (tighten the screws). Apply silicon grease. () Replace the outdoor unit fan motor. () Replace the outdoor unit control PCB assembly. () Replace the compressor. Replace the outdoor unit control PWB assembly Indoor/outdoor units in complete shutdown Indoor/outdoor units in complete shutdown Indoor unit in operation Outdoor unit in temporary stop Indoor/outdoor units in complete shutdown Indoor/outdoor units in complete shutdown Indoor/outdoor units in complete shutdown times 9 times times times times Outdoor unit AC Outdoor unit Thermistor installation cooling/heati error or -way valve ng switchover error Outdoor unit DC fan DC compressor Outdoor unit active filter AC overcurrent error AC overcurrent error in OFF status AC maximum current error AC current deficiency error Torque control error Outdoor unit DC fan rotation error Compressor startup error - Compressor rotation error PAM overvoltage error () Check the outdoor unit air outlet for blockage. () Check the outdoor unit fan for proper rotation. () Check the outdoor unit air outlet for blockage. () Check the outdoor unit fan for proper rotation. () Check if there is an open-circuit in the secondary winding of the current transformer of the outdoor unit control PCB. () Check if the refrigerant volume is abnormally low. () Check if the refrigerant flows properly. () Check to make sure outdoor unit thermistor TH (heat exchanger) TH (- way valve) are installed in correct positions. () Measure resistance of thermistors TH and TH. () Check the -way valve for proper operation. () No abnormality found in above inspections () through (). () Check if the refrigerant volume is abnormally low. () Check the -way valve for proper operation. () Check to see if the compressor type is correct. () Check connector CN of the outdoor unit DC fan motor for secure installation. () Check the outdoor unit fan motor for proper rotation. () Check fuse FU. () Outdoor unit control PCB () Check the colors (red, white, orange) of the compressor cords for proper connection. (PCB side, compressor side) () Check if the IPM terminal resistance values are uniform. () No abnormality found in above inspections () and (). () No abnormality found in above inspections () through (). () Check the AC power supply voltage for fluctuation. () No abnormality found in above inspection (). () Ensure unobstructed air flow from the outdoor unit air outlet. () Check the outdoor unit fan motor. () IPM continuity check () Replace the outdoor unit control PCB assembly. () Ensure unobstructed air flow from the outdoor unit air outlet. () Check the outdoor unit fan motor. () Replace the outdoor unit control PCB assembly. () Charge the specified amount of refrigerant. () Correct refrigerant clogs. (-way valve, -way valve, pipe, expansion valve) () Correct the installation. () Replace the thermistor assembly. () Replace the -way valve. () Replace the outdoor unit control PCB assembly. () Charge the specified amount of refrigerant. () Replace the -way valve. () Replace the compressor with the correct part. () Correct the installation. () Replace the outdoor unit fan motor. () Replace the outdoor unit control PCB assembly. () Replace the outdoor unit control PCB assembly. () Correct the installation. (U: Red, V: White, W: Orange) () Replace the outdoor unit control PCB assembly. () Replace the outdoor unit control PCB assembly. () Replace the compressor. () Connect stable power supply. () Replace the outdoor unit control PCB assembly. - PAM clock error () Check the PAM clock for proper input. () Replace the outdoor unit control PCB assembly. Indoor unit in operation Outdoor unit in complete shutdown Wires between units Wires between units Serial open-circuit Outdoor unit does not turn on due to erroneous wiring Serial short-circuit () Check the wires between units. () Check voltage between Nos. and on the indoor/outdoor unit terminal boards. () Check the wires between units. () Check the outdoor unit fuse. () Check -V, -V and -V voltages on the PCB. Check resistance between IPM terminals. ()CheckpinsNo.andofconnector CNA of the outdoor unit fan motor for short-circuit. () Outdoor unit control PCB () Connect stable power supply. () Replace the outdoor unit control PCB assembly. () Correct the wiring. () Replace the fuse/outdoor unit control PCB assembly. () Replace the outdoor unit control PCB assembly. () Replace the outdoor unit fan motor. () Replace the outdoor unit control PCB board. () Check the wires between units. () Correct the wiring. Serial erroneous wiring () Check the wires between units. () Correct the wiring.

24 GSXPHRN : Flashes in -sec intervals (normal), : On, : Off, : Flashes times in 0.-sec intervals (When LED on the outdoor unit flashes in -sec intervals, the outdoor unit is in normal condition.) Status of indoor/outdoor units Indoor/outdoor units in complete shutdown Indication by LED on outdoor unit * Indication by operation lamp on indoor unit Malfunction No. Content of diagnosis Lighting pattern at the time of timer lamp lighting Main Subcategory category Main Off for seconds category Sub-category 9-0 Indoor unit Indoor unit fan error fan Inspection location/method () Check the indoor fan motor for proper rotating operation. (Check fan lock.) () Check the lead wire of the indoor fan motor for open-circuit. () Check CN of the indoor unit fan motor for secure installation. () No abnormality found in above inspections () through (). Remedy () Replace the indoor fan motor. () Replace the indoor fan motor. () Correct the installation of CN of the indoor fan motor. () Replace the indoor unit control PCB. Indoor/outdoor units in operation 0-0 Indoor unit EEPROM data error control PCB (EEPROM read data error) () Replace the indoor unit control PCB. Indoor/outdoor units in operation -0 - Cluster circuit Cluster voltage error () Check if the cluster feedback voltage is proper (0. V to.9 V). () Check CN of the cluster for secure installation. () Replace the cluster unit. () Correctly install CN of the cluster. - Indoor/outdoor units in operation 0-0 Drain pump unit Drainpumpuniterror () Check connector CN and CN0. () Replace the Drain pump unit unit. () Re-insertion of CN and CN0. Malfunction indications due to erroneous wiring during air conditioner installation Inter-unit wiring error mode Indoor Outdoor unit unit Symptom Indoor unit relay Turns On momentarily, then turns Off. Malfunction diagnosis display "-" Inter-unit wiring error mode Indoor unit Outdoor unit Symptom Indoor unit relay Turns On momentarily, then turns Off. Malfunction diagnosis display "-" Indoor unit Outdoor unit Indoor unit relay Relays turns Off after about 0 sec. Malfunction diagnosis display None (Displays "-0" when malfunction code is called out.) Indoor unit Outdoor unit Indoor unit relay Turns On momentarily, then turns Off. Malfunction diagnosis display "-" Indoor unit Outdoor unit Indoor unit relay Relays turns Off after about 0 sec. Malfunction diagnosis display None (Displays "-0" when malfunction code is called out.) ) In addition to those described above, the following error, which does not result in a complete shutdown, is notified by the flashing LED on the indoor unit. Malfunction Serial open-circuit error Flashing LED ( : flashing in -sec intervals) Operation Timer Cluster (blue) Cluster (green) (The Operation and Cluster LED conditions vary based on the equipment operation.) Malfunction No. (main category) Serial open-circuit error

25 GSXPHRN. CAUTION IN CHECKING PRINTED CIRCUIT BOARDS (PWB) [GS-XPHR-N].. Non-insulated control circuit The GND terminals of the low-voltage circuits (control circuits for microcomputer and thermistors and drive circuits for expansion valve and relays) on the control printed circuit board (PWB) are connected to the compressor drive power supply (0-VDC negative terminal). Therefore, exercise utmost caution to prevent electric shock. If a measuring instrument used for the test is grounded, its chassis (ground) has the same electric potential as the 0-V probe. Since non-insulated circuits have the following voltage potential difference from the ground, connection of the grounding wire results in a short-circuit between the 0-V line and the ground, thus allowing an excessive current to flow to the tester to cause damage. If the sheaths of the thermistor lead wires or expansion valve lead wires inside the outdoor unit become damaged due to pinching by the front panel or other metal parts or contacting a pipe, a high voltage can flow and destroy the circuits. To prevent these problems, carefully conduct assembly work. Outdoor unit circuits AC Terminal board Reactor Ground + - Point (E) IPM 0-V line Point (F) M Compressor motor Reason The oscilloscope (chassis ground) has the same electric potential as the 0-V probe. The entire electronic control section of the outdoor unit has a voltage potential difference from the ground as shown in the above diagram. When the oscilloscope is set up, the 0-V line and the ground voltage (ground) will be short-circuited, resulting in an excessive current flow to cause damage to the oscilloscope or indoor electric circuits. 0-VDC line Voltage at point (E) Do not touch the cabinet or bring metal parts into contact with the cabinet. Danger!! Do not connect the grounding wire. 0-V line 0-V line voltage (point (F)). DIODE BRIDGE CHECK METHOD Turn off the power and let the inverter electrolytic capacitor (C9, C0) discharge completely. Then use a tester and check continuity. When using a digital tester, the (+) and (-) tester lead wires in the table must be reversed. Needle-type tester Normal resistance value B (several M ) Value in ( ) is for digital tester.

26 [] THERMISTOR TEMPERATURE CHARACTERISTICS GSXPHRN 0.. Temperature properties of indoor thermistors K TH Room temperature thermistor TH Heat exchange thermistor TH Valve temperature thermistor Resistance Room temperature thermistor TH (yellow) ºC resistance 0 K Connector CN Resistance ( ) 0K 0K 0K 0ºC resistance. K ºC resistance. K Connector CN TH 0 Tester 0K Tester Temperature (ºC) 0.. Temperature properties of outdoor thermistors Connector CN 0 Connector CN K Resistance 00K (K ) 00K 00K 00K 0 0K Tester Tester Resistance Resistance at 0 (K ) 0K. k (In case of TH heat exchanger thermistor) Resistance at Resistance at. k 0K. k TH TH.K.0K 0K.K.K.K Temperature( ) Temperature( ) TH Compressor thermistor TH Heat exchanger thermistor TH Outdoor air temperature thermistor TH Suction thermistor TH -way valve thermistor Thermistor Compressor thermistor Heat exchanger thermistor Outdoor air temperature thermistor Suction thermistor -way valve thermistor No. TH TH TH TH TH Connector No. () - No. () No. () - No. () No. () - No. () No. () - No. () No. (9) - No. (0) Color Red Orange Green Black Yellow Before measuring resistance, disconnect connectors from PWB. [] HOW TO OPERATE THE OUTDOOR UNIT INDEPENDENTLY. Cooling in 0 Hz fixed mode To operate the outdoor unit independently, short-circuit the sections indicated by arrows in the diagram below with an adapter, and apply 0 VAC between () and (N) on the terminal board of the outdoor unit. This allows the outdoor unit to be operated in cooling mode independently. (Do not operate the outdoor unit in this condition for an extended period of time.) C0 C9 (L) Connect with IC clip Test mode cooling at 0 Hz Short-circuit negative terminal of capacitor (C) and jumper wire (JP) using IC clip, etc.

27 GSXPHRN GSXPHRN CHAPTER. REFRIGERATION CYCLE Service Manual [] FLOW FOR REFRIGERANT Indoor unit Evaporator Flare coupling Flare coupling -way valve Silencer Outdoor unit -way valve Heating s Cooling Strainer Accumulator Compressor Expansion valve Coil Condenser C Reverse valve [] STANDARD CONDITION Indoor side Outdoor side Dry-bulb Temp. Relative Humidity Dry-bulb Temp. Relative Humidity Cooling C % C 0% Heating 0 C C % * REFRIGERANT PIPE LENGTH.0m [] TEMPERATURE AT EACH PART AND PRESSURE IN -WAY VALVE Model GS-XPHR-N Operation mode MAX. TEST RUN Cool Heat Cool Heat No. R.P.M C 0. C C C C C C C C C C C C C C C -way valve pressure (MPaG) [] PERFORMANCE CURVES NOTE ) Indoor fan speed: Hi ) Vertical adjustment louver "0, Horizontal adjustment louver "front" ) Indoor air temp. : Cooling C, Heating 0 C ) Power source :, 0Hz

28 0.. At Cooling 0.. At Heating GSXPHRN Cooling capacity(kw) Input(W) Outlet air temp.(ºc) Input(W) Heating capacity(kw) Outlet air temp.(ºc) 0 0 Outside air temp.(ºc) Outside air temp.(ºc)

29 GSXPHRN GSXPHRN CHAPTER. DISASSEMBLING PROCEDURE [] DISASSEMBLY OF INDOOR UNIT Service Manual CAUTION: DISCONNECT THE UNIT FROM POWER SUPPLY BEFORE ANY SERVICING. ) Slide Grille hooks to the left, and open the Grille. (Right and left ) Remove the screw fixing the Side cover. (Right and left Side cover.) Grille.) Side Cover Side Cover Front Panel Slide ) Remove screws fixing the Grille. (Right and left Grille.) GRILLE HOOK ) Remove screws fixing the Girlls.

30 GSXPHRN ) Remove screw fixing the Angle. Remove the Angle to the direction of arrows. ) Cut the fixing band. Disconnect connectors (CN0, CN0). Remove the screw fixing the Display unit.

31 GSXPHRN ) Slide the Display unit to the direction of arrow. 0)Support the Front panel with your hand, and remove the screw. Slide ) Remove screws fixing the Angle to the Front panel. )Remove the Front panel to the position where the Front panel is separated from the Drain pan. DRAIN PAN 9) Remove screws fixing the Front panel. This position

32 )Remove the Front panel to the direction of arrow. CAUTION: DO NOT DAMAGE THE DRAIN PAN WITH THE DIS- PLAY HOLDER. CAUTION: GSXPHRN WHEN YOU ASSEMBLE THE FRONT PANEL TO DRAIN PAN, INSERT HOOK OF THE FRONT PANEL BETWEEN ANGLE AND DRAIN PAN ( POSI- TIONS). (ACTUALLY ASSEMBLE THE FRONT PANEL TO THE DRAIN PAN AFTER FIXING THE DISPLAY HOLDER TO THE FRONT PANEL.) DISPLAY HOLDER HOOK OF FRONT PANEL DRAIN PAN Insert ANGLE CAUTION: DISCHARGE THE WATER IN THE DRAIN PAN ASS'Y BEFORE REMOVING THE DRAIN PAN ASS'Y. )Loosen the screw of the Hose band. Remove the Drain hose. Slide Angles hold the Front panel and the Drain pan in these positions.

33 GSXPHRN )Remove 9 screws fixing the Drain pan ass'y. )Tilt the Drain pan ass'y, slide the Drain pan ass'y to the direction of arrow. Right and left side. Right and left side. )Remove insulators and screws fixing the Drain pan ass'y. Insulator )Disconnect connectors (CN0, CN0, CN0 and CN0). Remove screws fixing the Top duct cover R.

34 )Disconnect the connector (CN0). Remove screws fixing the Top duct cover L. GSXPHRN 9)Remove screws fixing the top duct. )Remove screws fixing the Top duct cover R. Remove the Top duct cover R and H-louver ass'y. 0)Tilt the Top duct for removing the rib of the Top duct, remove the unit to the direction of arrow. H-louver ass'y TopductcoverR )Remove screws fixing the End plate sub.