SERVICE MANUAL MUY-GL24NA - U1. No. OBH733. Models HFC. Revision B: REVISED EDITION-B R410A

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1 Revision B: MUZ-GL09NA- U8 and MUZ-GL09NAH- U8 have been added. Please void OBH733 REVISED EDITION-A. OUTDOOR INDOOR UNIT UNIT SERVICE MANUAL HFC utilized R410A. OBH733 REVISED EDITION-B Models MUZ-GL09NA - U8 MUZ-GL09NAH - U8 MUY-GL09NA - U1 MUZ-GL12NA - U1 MUZ-GL12NAH - U1 MUY-GL12NA - U1 MUZ-GL15NA - U1 MUZ-GL15NAH - U1 MUY-GL15NA - U1 MUZ-GL18NA - U1 MUZ-GL18NAH - U1 MUY-GL18NA - U1 MUZ-GL24NA - U1 MUY-GL24NA - U1 Indoor unit service manual MSZ-GL NA, MSY-GL NA Series (OBH732) MUZ-GL18/24NA MUZ-GL18NAH MUY-GL18/24NA CONTENTS 1. TECHNICAL CHANGES 2 2. PART NAMES AND FUNCTIONS 3 3. SPECIFICATION 4 4. OUTLINES AND DIMENSIONS 7 5. WIRING DIAGRAM 9 6. REFRIGERANT SYSTEM DIAGRAM DATA ACTUATOR CONTROL SERVICE FUNCTIONS TROUBLESHOOTING DISASSEMBLY INSTRUCTIONS 62 PARTS CATALOG (OBB733) NOTE: RoHS compliant products have <G> mark on the spec name plate.

2 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. Correct 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. Revision A: MUZ-GL12/15NA- U1, MUZ-GL12/15NAH- U1 and MUY-GL09/12/15NA- U1 have been added. Revision B: MUZ-GL09NA- U8 and MUZ-GL09NAH- U8 have been added. 1 TECHNICAL CHANGES MUZ-GL18NA - U1 MUZ-GL18NAH - U1 MUY-GL18NA - U1 MUZ-GL24NA - U1 MUY-GL24NA - U1 1. New model MUZ-GL09NA - U8 MUZ-GL09NAH - U8 MUY-GL09NA - U1 MUZ-GL12NA - U1 MUZ-GL12NAH - U1 MUY-GL12NA - U1 MUZ-GL15NA - U1 MUZ-GL15NAH - U1 MUY-GL15NA - U1 1. New model 2

3 2 PART NAMES AND FUNCTIONS MUZ-GL09NA MUZ-GL12NA MUZ-GL15NA MUZ-GL09NAH MUY-GL09NA MUZ-GL12NAH MUY-GL12NA MUZ-GL15NAH MUY-GL15NA Air inlet (back and side) Piping Air outlet Drain hose Drain outlet MUZ-GL18NA MUZ-GL24NA MUZ-GL18NAH MUY-GL18NA MUY-GL24NA Air inlet (back and side) Piping Drain hose Air outlet Drain outlet 3

4 3 SPECIFICATION Outdoor unit model Capacity Rated (Minimum~Maximum) MUZ- GL09NA MUZ- GL09NAH 4 MUY- GL09NA MUZ- GL12NA MUZ- GL12NAH MUY- GL12NA MUZ- GL15NA MUZ- GL15NAH MUY- GL15NA Cooling 1 Btu/h 9,000 (3,600-12,200) 12,000 (1,500-13,600) 14,000 (3,100-18,200) 10,900 14,400 18,000 Heating 47 1 (MUZ) Btu/h (4,500-14,100) (2,000-18,100) (4,800-20,900) Capacity 6,900 9,200 12,200 Heating 17 2 (MUZ) Btu/h Rated (Maximum) (10,800) (12,000) (16,400) Cooling 1 W 585 (240-1,050) 920 (100-1,300) 1,080 (210-2,000) Power consumption 720 1,100 1,600 Rated (Minimum~Maximum) Heating 47 1 (MUZ) W (230-1,350) (110-1,620) (2,010) Power consumption ,190 Heating 17 2 (MUZ) W Rated (Maximum) (1,060) (1,240) (1,850) EER 1 [SEER] 3 Cooling 15.4 [24.6] 13.0 [23.1] 13.0 [21.6] NA: NA: NA: HSPF IV 4 Heating (MUZ) NAH: NAH: NAH: COP Heating 1 (MUZ) Power factor Cooling (208/230) % 92/92 87/87 95/95 97/97 Heating (MUZ) (208/230) % 95/95-96/96 98/98 Power supply V, phase, Hz 208/230, 1, 60 Max. fuse size (time delay) A 15 Min. circuit ampacity A Fan motor F.L.A A 0.50 Model SNB092FQAMT KNB073FRVMC SNB092FQAMT SNB130FQBMT Compressor R.L.A A L.R.A A Refrigeration oil L (Model) 0.35 (FV50S) 0.27 (FV50S) 0.35 (FV50S) 0.35 (FV50S) Refrigerant control Linear expansion valve Sound level 1 Cooling db(a) Heating (MUZ) db(a) Airfl ow Cooling CFM 1, High - Med. - Low Heating (MUZ) CFM 1,186-1,116-1,045-1,186-1,116-1,045-1,186-1,045-1,045 - Fan speed Cooling rpm High - Med. - Low Heating (MUZ) rpm Defrost method Reverse cycle W in. 31-1/2 Dimensions D in. 11-1/4 H in. 21-5/8 Weight Ib. 81 External fi nish Munsell 3Y 7.8/1.1 Remote controller Wireless type Control voltage (by built-in transformer) VDC Refrigerant piping t supplied Refrigerant pipe size Liquid in. 1/4 (0.0315) (Min. wall thickness) Gas in. 3/8 (0.0315) 1/2 (0.0315) Connection method Indoor Flared Outdoor Flared Between the indoor Height difference ft. 40 & outdoor units Piping length ft. 65 Refrigerant charge (R410A) 2 lb. 9 oz. NOTE: Test conditions are based on AHRI 210/240. 1: Rating conditions (Cooling) Indoor: 80 FDB, 67 FWB, Outdoor: 95 FDB, (75 FWB) (Heating) Indoor: 70 FDB, 60 FWB, Outdoor: 47 FDB, 43 FWB 2: (Heating) Indoor: 70 FDB, 60 FWB, Outdoor: 17 FDB, 15 FWB 3: Test condition (Refer to page 6.) 4: Test condition (Refer to page 6.)

5 Outdoor unit model Capacity Rated (Minimum~Maximum) Capacity Rated (Maximum) Power consumption Rated (Minimum~Maximum) MUZ-GL18NA MUY-GL18NA MUZ-GL24NA MUY-GL24NA MUZ-GL18NAH Cooling 1 Btu/h 18,000 (5,800 ~ 22,000) 22,500 (8,200 ~ 31,400) Heating 47 1 (MUZ) Btu/h 21,600 (5,400 ~ 25,000) - 27,600 (7,500 ~ 36,900) - Heating 17 2 (MUZ) Btu/h 13,800 (18,200) - 16,000 (24,600) - Cooling 1 W 1,295 (285 ~ 2,105) 1,742 (560 ~ 3,522) Heating 47 1 (MUZ) W 1,635 (275 ~ 2,455) 2,282 (508 ~ 3,592) Power consumption Rated (Maximum) Heating 17 2 (MUZ) W 1,435 (2,105) - 1,712 (3,232) - EER 1 [SEER] 3 Cooling 13.4 [20.5] 12.5 [20.5] HSPF IV 4 Heating (MUZ) NA: NA: 10.0 NAH: COP Heating 1 (MUZ) Power factor Cooling (208/230) % 99/99 99/99 Heating (MUZ) (208/230) % 99/99-99/99 - Power supply V, phase, Hz 208/230, 1, 60 Max. fuse size (time delay) A Min. circuit ampacity A Fan motor F.L.A A Model SNB130FQBMT SNB172FQKMT Compressor R.L.A A L.R.A A Refrigeration oil L (Model) 0.35 (FV50S) 0.35 (FV50S) 0.40 (FV50S) Refrigerant control Linear expansion valve Sound level 1 Cooling db(a) Heating (MUZ) db(a) Airfl ow High - Med. - Low Fan speed High - Med. - Low Defrost method Dimensions Cooling CFM 1, ,016-1, Heating (MUZ) CFM 1,689-1,689-1,372-1,701-1,701-1,341 - Cooling rpm Heating (MUZ) rpm Reverse cycle W in. 33-1/16 D in. 13 H in. 34-5/8 Weight Ib External fi nish Munsell 3Y 7.8/1.1 Remote controller Wireless type Control voltage (by built-in transformer) VDC Refrigerant piping t supplied Refrigerant pipe size (Min. wall thickness) Connection method Between the indoor & outdoor units Liquid in. 1/4 (0.0315) 3/8 (0.0315) Gas in. 1/2 (0.0315) 5/8 (0.0315) Indoor Flared Outdoor Flared Height difference ft. 50 Piping length ft. 100 Refrigerant charge (R410A) 3 lb. 9 oz. 4 lb. 3 oz. NOTE: Test conditions are based on AHRI 210/240. 1: Rating conditions (Cooling) Indoor: 80 FDB, 67 FWB, Outdoor: 95 FDB, (75 FWB) (Heating) Indoor: 70 FDB, 60 FWB, Outdoor: 47 FDB, 43 FWB 2: (Heating) Indoor: 70 FDB, 60 FWB, Outdoor: 17 FDB, 15 FWB 3: Test condition (Refer to page 6.) 4: Test condition (Refer to page 6.) 5

6 Test condition 3, 4 ARI Mode Test SEER (Cooling) HSPF (Heating) "A-2" Cooling Steady State at rated compressor Speed "B-2" Cooling Steady State at rated compressor Speed "B-1" Cooling Steady State at minimum compressor Speed "F-1" Cooling Steady State at minimum compressor Speed "E-V" Cooling Steady State at Intermediate compressor Speed 5 "H1-2" Heating Steady State at rated compressor Speed "H3-2" Heating at rated compressor Speed "H0-1" Heating Steady State at minimum compressor Speed "H1-1" Heating Steady State at minimum compressor Speed "H2-V" Heating at Intermediate compressor Speed 5 Indoor air condition ( F) Outdoor air condition ( F) Dry bulb Wet bulb Dry bulb Wet bulb (75) (65) (65) (53.5) (69) NOTE: 5: At Intermediate compressor Speed = ("Rated compressor speed" - "minimum compressor speed") / 3 + "minimum compressor speed". OPERATING RANGE (1) POWER SUPPLY Rated voltage Guaranteed voltage (V) Outdoor unit 208/230 V 1 phase 60 Hz Min Max. 253 (2) OPERATION Intake air temperature ( F) Mode Condition Indoor Outdoor DB WB DB WB Standard temperature Cooling Maximum temperature Minimum temperature Maximum humidity 78 % Standard temperature Heating Maximum temperature Minimum temperature

7 4 OUTLINES AND DIMENSIONS MUZ-GL09NA MUZ-GL12NA MUZ-GL15NA MUZ-GL09NAH MUY-GL09NA MUZ-GL12NAH MUY-GL12NA MUZ-GL15NAH MUY-GL15NA Unit: inch REQUIRED SPACE *1 4 in. (100 mm) or more when front and sides of the unit are clear 4 in. (100 mm) or more clear *1 4 in. (100 mm) or more (GL09/12/15NA) (GL12/15NAH) 8 in. (200 mm) or more *2 14 in. (350 mm) or more *2 When any 2 sides of left, right and rear of the unit are clear holes Liquid refrigerant pipe joint Refrigerant pipe (flared) Ø 1/4 Gas refrigerant pipe joint Refrigerant pipe (flared) Ø 3/8 (GL09/12) Ø 1/2 (GL15) 7

8 MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA MUZ-GL24NA MUY-GL24NA Unit: inch REQUIRED SPACE *1 20 in. (500 mm) or more when front and sides of the unit are clear Clear *1 16-7/16 Air in Drain hole 1-9/16 1-5/8 4 in. (100 mm) or more 4 in. (100 mm) or more 13 2 Air in 14-3/16 Air out 6-7/ / /16 4-5/16 2-holes 13/32 13/16 3-3/16 20 in. (500 mm) or more *2 Service panel 14 in. (350 mm) or more *2 When any 2 sides of left, right and rear of the unit are clear Liquid refrigerant pipe joint Refrigerant pipe (flared) Ø 1/4 (GL18) Refrigerant pipe (flared) Ø 3/8 (GL24) 17-25/ / /2 3-29/ /16 Gas refrigerant pipe joint Refrigerant pipe (flared) Ø 1/2 (GL18) Refrigerant pipe (flared) Ø 5/8 (GL24) 8

9 5 WIRING DIAGRAM MUZ-GL09NA MUZ-GL12NA 9

10 MUZ-GL09NAH MUZ-GL12NAH 10

11 MUY-GL09NA MUY-GL12NA 11

12 MUZ-GL15NA 12

13 MUZ-GL15NAH 13

14 MUY-GL15NA 14

15 MUZ-GL18NA 15

16 MUZ-GL18NAH 16

17 MUY-GL18NA 17

18 MUZ-GL24NA 18

19 MUY-GL24NA 19

20 6 REFRIGERANT SYSTEM DIAGRAM MUZ-GL09NA MUZ-GL12NA MUZ-GL15NA MUZ-GL09NAH MUY-GL09NA MUZ-GL12NAH MUY-GL12NA MUZ-GL15NAH MUY-GL15NA Unit: Inch (mm) Refrigerant pipe ø3/8 (ø9.52) (GL09/12) ø1/2 (ø12.7) (GL15) 4-way valve (with heat insulator) Flared connection Muffler Stop valve (with service port) Service port Discharge temperature thermistor RT62 Muffler Service port Compressor Defrost thermistor RT61 (MUZ) Outdoor heat exchanger Outdoor heat exchanger temperature thermistor RT68 Ambient temperature thermistor RT65 Flared connection Stop valve (with strainar) Refrigerant pipe ø1/4 (ø6.35) (with heat insulator) MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA Refrigerant pipe ø1/2 (ø12.7) (with heat insulator) Capillary tube O.D I.D /16 (ø4.0 ø ) 4-way valve LEV Capillary tube O.D I.D /32 (ø3.0 ø ) Refrigerant flow in cooling Refrigerant flow in heating (MUZ) Muffler with #100 mesh strainer Strainer #100 R.V. coil (MUZ) heating ON cooling OFF Service port Flared connection Stop valve (with service port) Service port Discharge temperature thermistor RT62 Defrost thermistor RT61 (MUZ) Outdoor heat exchanger Flared connection Stop valve Refrigerant pipe ø1/4 (ø6.35) (with heat insulator) Strainer #100 Muffler Compressor Capillary tube O.D I.D /16 (ø4.0 ø ) Capillary tube O.D I.D /8 (ø3.0 ø ( 4)) LEV Strainer # Capillary tube O.D I.D /8 (ø4.0 ø ) Outdoor heat exchanger temperature thermistor RT68 R.V. coil (MUZ) heating ON cooling OFF Refrigerant flow in cooling Refrigerant flow in heating (MUZ)

21 MUZ-GL24NA MUY-GL24NA Refrigerant pipe ø5/8 (ø15.88) (with heat insulator) 4-way valve Muffler with #100 mesh strainer Service port Flared connection Stop valve (with service port) Service port Discharge temperature thermistor RT62 Defrost thermistor RT61 (MUZ) Outdoor heat exchanger Ambient temperature thermistor RT65 Compressor Outdoor heat exchanger temperature thermistor RT68 Flared connection Stop valve Refrigerant pipe ø3/8 (ø9.52) (with heat insulator) Strainer #100 LEV Capillary tube O.D I.D /16 (ø4.0 ø ) Strainer #100 R.V. coil (MUZ) heating ON cooling OFF Refrigerant flow in cooling Refrigerant flow in heating (MUZ) 21

22 MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Model MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA MUZ-GL24NA MUY-GL24NA Max. Length A Refrigerant piping: ft. Max. Height difference B Gas 3/8 1/2 Piping size O.D: in. Liquid 1/4 5/8 3/8 Indoor unit Max. Height difference B Max. Length A Outdoor unit ADDITIONAL REFRIGERANT CHARGE (R410A: oz.) NOTE: Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation. Model MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA Outdoor unit precharged Refrigerant piping length (one way): ft lb. 9 oz Calculation: X oz. = 1.08/5 oz./ft. (Refrigerant piping length (ft.) - 25) 22

23 NOTE: Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation. Model MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA Outdoor unit precharged Refrigerant piping length (one way): ft lb. 9 oz Calculation: X oz. = 1.08/5 oz./ft. (Refrigerant piping length (ft.) - 25) NOTE: Refrigerant piping exceeding 33 ft. requires additional refrigerant charge according to the calculation. Model MUZ-GL24NA MUY-GL24NA Outdoor unit precharged Refrigerant piping length (one way): ft lb. 3 oz Calculation: X oz. = 2.96/5 oz./ft. (Refrigerant piping length (ft.) - 33) 23

24 7 DATA MUZ-GL09NA MUZ-GL12NA MUZ-GL15NA MUZ-GL18NA MUZ-GL24NA MUZ-GL09NAH MUY-GL09NA MUZ-GL12NAH MUY-GL12NA MUZ-GL15NAH MUY-GL15NA MUZ-GL18NAH MUY-GL18NA MUY-GL24NA 7-1. PERFORMANCE DATA 1) COOLING CAPACITY Indoor air Model IWB ( F) MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA MUZ-GL24NA MUY-GL24NA Outdoor intake air DB temperature ( F) TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC NOTE: 1. IWB : Intake air wet-bulb temperature TC : Total Capacity (x10 3 Btu/h) SHC : Sensible Heat Capacity (x10 3 Btu/h) TPC : Total Power Consumption (kw) 2. SHC is based on 80 F of indoor Intake air DB temperature. 2) COOLING CAPACITY CORRECTIONS MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA MUZ-GL24NA MUY-GL24NA Refrigerant piping length (one way: ft.) 25 (std.)

25 3) HEATING CAPACITY (MUZ) Indoor air Outdoor intake air WB temperature ( F) Model IDB ( F) TC TPC TC TPC TC TPC TC TPC TC TPC TC TPC TC TPC MUZ-GL09NA MUZ-GL12NA MUZ-GL09NAH MUZ-GL12NAH MUZ-GL15NA MUZ-GL15NAH MUZ-GL18NA MUZ-GL18NAH MUZ-GL24NA NOTE: 1. IDB : Intake air dry-bulb temperature TC : Total Capacity (x10 3 Btu/h) TPC : Total Power Consumption (kw) 2. Above data is for heating operation without any frost. How to operate with fixed operational frequency of the compressor. 1. Press the EMERGENCY OPERATION switch on the front of the indoor unit, and select either EMERGENCY COOL mode or EMERGENCY HEAT mode before starting to operate the air conditioner. 2. The compressor starts with operational frequency. 3. The fan speed of the indoor unit is High. 4. This operation continues for 30 minutes. 5. In order to release this operation, press the EMERGENCY OPERATION switch or press any button on the remote controller. 25

26 7-2. PERFORMANCE CURVE Cooling Capacity correction factors Cooling capacity (at Rated frequency) Outdoor intake air DB temperature( F) Indoor intake air Wet-bulb temperature( F) MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA Total power consumption (kw) SHF at rating condition = 0.82 Airflow = 399 CFM Indoor intake air WB temperature ( F) Outdoor intake air DB temperature ( F) MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA Total power consumption (kw) SHF at rating condition = 0.77 Airflow = 399 CFM Indoor intake air WB temperature ( F) Outdoor intake air DB temperature ( F) MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA Total power consumption (kw) SHF at rating condition = 0.78 Airflow = 533 CFM Outdoor intake air DB temperature ( F) Indoor intake air WB temperature ( F) MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA Total power consumption (kw) SHF at rating condition = 0.87 Airflow = 646 CFM Indoor intake air WB temperature ( F) Outdoor intake air DB temperature ( F) MUZ-GL24NA MUY-GL24NA Total power consumption (kw) SHF at rating condition = 0.75 Airflow = 634 CFM Indoor intake air WB temperature ( F) Outdoor intake air DB temperature ( F) This value of frequency is not the same as the actual frequency in operating. Refer to 7-5 and 7-6 for the relationships between frequency and capacity. 26

27 Heating Capacity correction factor Heating capacity (at Rated frequency) Indoor intake air Dry-bulb temperature ( F) Outdoor intake air WB temperature ( F) MUZ-GL09NA Total power consumption (kw) Indoor intake air DB temperature ( F) Airflow = 406 CFM Outdoor intake air WB temperature ( F) MUZ-GL09NAH Total power consumption (kw) Indoor intake air DB temperature ( F) Airflow = 406 CFM Outdoor intake air WB temperature ( F) MUZ-GL12NA Total power consumption (kw) MUZ-GL15NA Total power consumption (kw) Indoor intake air DB temperature ( F) Airflow = 406 CFM Outdoor intake air WB temperature ( F) Indoor intake air DB temperature ( F) Airflow = 463 CFM Outdoor intake air WB temperature ( F) MUZ-GL12NAH Total power consumption (kw) Outdoor intake air WB temperature ( F) MUZ-GL15NAH Total power consumption (kw) Indoor intake air DB temperature ( F) Indoor intake air DB temperature ( F) Airflow = 406 CFM Airflow = 463 CFM Outdoor intake air WB temperature ( F)

28 MUZ-GL18NA Total power consumption (kw) Indoor intake air DB temperature ( F) Airflow = 646 CFM Outdoor intake air WB temperature ( F) MUZ-GL18NAH Total power consumption (kw) Indoor intake air DB temperature ( F) Airflow = 646 CFM Outdoor intake air WB temperature ( F) MUZ-GL24NA Total power consumption (kw) Indoor intake air DB temperature ( F) Airflow = 738 CFM Outdoor intake air WB temperature ( F) This value of frequency is not the same as the actual frequency in operating. Refer to 7-5 and 7-6 for the relationships between frequency and capacity. 28

29 7-3. CONDENSING PRESSURE Cooling Data are based on the condition of indoor humidity 50 %. Air flow should be set to High speed. MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA (PSIG) 450 Condensing pressure Indoor DB temperature ( F) ( F) Outdoor ambient temperature MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA (PSIG) 500 Condensing pressure MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA ( F) Outdoor ambient temperature (PSIG) 500 Condensing pressure Indoor DB temperature ( F) Indoor DB temperature ( F) ( F) Outdoor ambient temperature (PSIG) 180 Suction pressure Indoor DB temperature ( F) Outdoor ambient temperature (PSIG) 180 Suction pressure Indoor DB temperature ( F) Outdoor ambient temperature (PSIG) 180 Suction pressure Indoor DB temperature ( F) Outdoor ambient temperature ( F) ( F) ( F) 29

30 MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA (PSIG) 500 Condensing pressure Indoor DB temperature ( F) (PSIG) 180 Suction pressure Indoor DB temperature ( F) ( F) Outdoor ambient temperature Outdoor ambient temperature ( F) MUZ-GL24NA MUY-GL24NA Condensing pressure (PSIG) Indoor DB temperature ( F) Suction pressure (PSIG) Indoor DB temperature ( F) ( F) Outdoor ambient temperature ( F) Outdoor ambient temperature 30

31 Heating Data are based on the condition of outdoor humidity 75%. Air flow should be set to High speed. Data are for heating operation without any frost. MUZ-GL09NA MUZ-GL09NAH Condensing pressure (PSIG) Indoor DB temperature ( F) 58Hz (PSIG) Suction pressure Indoor DB temperature ( F) 58Hz ( F) Outdoor ambient temperature ( F) Outdoor ambient temperature MUZ-GL12NA MUZ-GL12NAH (PSIG) (PSIG) Condensing pressure Indoor DB temperature ( F) Suction pressure Indoor DB temperature ( F) Hz 65 58Hz ( F) Outdoor ambient temperature ( F) Outdoor ambient temperature MUZ-GL15NA MUZ-GL15NAH Condensing pressure (PSIG) Indoor DB temperature ( F) (PSIG) 190 Suction pressure Indoor DB temperature ( F) Hz 65 58Hz ( F) Outdoor ambient temperature ( F) Outdoor ambient temperature 31

32 MUZ-GL18NA MUZ-GL18NAH Condensing pressure (PSIG) Indoor DB temperature ( F) (PSIG) 200 Suction pressure Indoor DB temperature ( F) Hz 75 81Hz ( F) Outdoor ambient temperature ( F) Outdoor ambient temperature MUZ-GL24NA Condensing pressure (PSIG) Indoor DB temperature ( F) Suction pressure (PSIG) Indoor DB temperature ( F) Hz Hz ( F) ( F) Outdoor ambient temperature Outdoor ambient temperature 32

33 7-4. STANDARD OPERATION DATA Total Electrical circuit Refrigerant circuit Indoor unit Outdoor unit Model MSZ-GL09NA MSY-GL09NA MSZ-GL12NA MSY-GL12NA MSZ-GL15NA MSY-GL15NA Item Unit Cooling Heating Cooling Cooling Heating Cooling Heating Capacity Btu/h 9,000 10,900 9,000 12,000 14,400 14,000 18,000 SHF Input kw Rated frequency Hz Indoor unit MSZ-GL09NA MSY-GL09NA Power supply V, phase, Hz 208/230, 1, 60 MSZ-GL12NA MSY-GL12NA MSZ-GL15NA MSY-GL15NA Input kw Fan motor current A 0.24/ / / / / / /0.31 Outdoor unit MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA Power supply V, phase, 208/230, 1, 60 Hz Input kw Comp. current A 2.45/ / / / / / /6.43 Fan motor current A 0.36/ / / / / / /0.36 Condensing pressure PSIG Suction pressure PSIG Discharge temperature F Condensing temperature F Suction temperature F Comp. shell bottom temperature F Ref. pipe length ft. 25 Refrigerant charge (R410A) 2 lb 9 oz. Intake air temperature DB F WB F Discharge air temperature DB F WB F Fan speed (High) rpm 1,020 1,040 1,020 1,020 1,040 1,280 1,140 Airfl ow (High) CFM 367 (Wet) (Wet) 367 (Wet) (Wet) 463 Intake air temperature DB F WB F Fan speed rpm Airfl ow CFM 1,229 1,172 1,229 1,229 1,172 1,243 1,229 33

34 Outdoor unit Indoor unit Refrigerant circuit Electrical circuit Total Model MSZ-GL18NA MSY-GL18NA MSZ-GL24NA MSY-GL24NA Item Unit Cooling Heating Cooling Heating Capacity Btu/h 18,000 21,600 22,500 27,600 SHF Input kw Rated frequency Hz Indoor unit Power supply V, phase, Hz MSZ-GL18NA MSY-GL18NA 208/230, 1, 60 MSZ-GL24NA MSY-GL24NA Input kw Fan motor current A 0.46/ /0.51 Outdoor unit Power supply V, phase, Hz MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA 208/230, 1, 60 MUZ-GL24NA MUY-GL24NA Input kw Comp. current A 5.01/ / / /8.67 Fan motor current A 1.05/ / / /1.02 Condensing pressure PSIG Suction pressure PSIG Discharge temperature F Condensing temperature F Suction temperature F Comp. shell bottom temperature F Ref. pipe length ft. 25 Refrigerant charge (R410A) 3 lb 9 oz. 4 lb 3 oz. Intake air temperature Discharge air temperature DB F WB F DB F WB F Fan speed (High) rpm 1,170 1,170 1,300 1,300 Airfl ow (High) CFM 581 (Wet) (Wet) 738 Intake air temperature DB F WB F Fan speed rpm Airfl ow CFM 1,691 1,691 1,769 1,701 34

35 7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY MUY-GL09NA 2.0 Correction of Cooling capacity Correction of Cooling total input 2.0 Capacity correction factors Input correction factors (Hz) (Hz) The operational frequency of compressor The operational frequency of compressor MUZ-GL09NA MUZ-GL09NAH Correction of Cooling capacity Correction of Cooling total input Correction of Heating capacity Correction of Heating total input 2.0 Capacity correction factors Input correction factors Capacity correction factors Input correction factors (Hz) (Hz) (Hz) (Hz) The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA Correction of Cooling capacity Correction of Cooling total input Correction of Heating capacity Correction of Heating total input Capacity correction factors Input correction factors Capacity correction factors Input correction factors (Hz) (Hz) (Hz) (Hz) The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA Correction of Cooling capacity Correction of Cooling total input Correction of Heating capacity Correction of Heating total input Capacity correction factors Input correction factors Capacity correction factors Input correction factors (Hz) (Hz) (Hz) (Hz) The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor 35

36 MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA 2.0 Correction of Cooling capacity Correction of Cooling total input Correction of Heating capacity Correction of Heating total input 2.0 Capacity correction factors Capacity correction factors (Hz) (Hz) (Hz) (Hz) The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor MUZ-GL24NA MUY-GL24NA Correction of Cooling capacity Input correction factors Input correction factors Correction of Cooling total input Capacity correction factors Capacity correction factors Correction of Heating capacity Input correction factors Input correction factors Correction of Heating total input (Hz) The operational frequency of compressor (Hz) The operational frequency of compressor (Hz) The operational frequency of compressor (Hz) The operational frequency of compressor 7-6. HOW TO OPERATE FIXED-FREQUENCY OPERATION (Test run operation) 1. Press EMERGENCY OPERATION switch to start COOL or HEAT mode (COOL: Press once, HEAT: Press twice). 2. Test run operation starts and continues to operate for 30 minutes. 3. Compressor operates at rated frequency in COOL mode or 58 Hz in HEAT mode. 4. Indoor fan operates at High speed. 5. After 30 minutes, test run operation finishes and EMERGENCY OPERATION starts (operation frequency of compressor varies). 6. To cancel test run operation (EMERGENCY OPERATION), press EMERGENCY OPERATION switch or any button on the remote controller. 36

37 8 ACTUATOR CONTROL MUZ-GL09NA MUZ-GL12NA MUZ-GL15NA MUZ-GL18NA MUZ-GL24NA MUZ-GL09NAH MUY-GL09NA MUZ-GL12NAH MUY-GL12NA MUZ-GL15NAH MUY-GL15NA MUZ-GL18NAH MUY-GL18NA MUY-GL24NA 8-1. OUTDOOR FAN MOTOR CONTROL The fan motor turns ON/OFF, interlocking with the compressor. [ON] The fan motor turns ON 5 seconds before the compressor starts up. [OFF] The fan motor turns OFF 15 seconds after the compressor has stopped running. Compressor Outdoor fan motor ON OFF ON 5 seconds 15 seconds OFF 8-2. R.V. COIL CONTROL (MUZ) Heating ON Cooling OFF Dry OFF NOTE: The 4-way valve reverses for 5 seconds right before start-up of the compressor. <COOL> <HEAT> 5 seconds 5 seconds ON Compressor OFF R.V.coil ON OFF Outdoor fan ON motor OFF 8-3. RELATION BETWEEN MAIN SENSOR AND ACTUATOR Sensor Purpose Compressor 37 LEV Actuator Outdoor fan motor R.V.coil Indoor fan motor Discharge temperature Protection thermistor Cooling: Coil frost prevention Indoor coil temperature thermistor Heating: High pressure protection Defrost thermistor (MUZ) Heating: Defrosting Fin temperature thermistor Protection Cooling: Low ambient temperature operation Ambient temperature thermistor Outdoor heat exchanger temperature thermistor *. MUZ-GL NAH only. Heating: Defrosting (Heater) Cooling: Low ambient temperature operation Cooling: High pressure protection Defrost heater *

38 9 SERVICE FUNCTIONS MUZ-GL09NA MUZ-GL12NA MUZ-GL15NA MUZ-GL18NA MUZ-GL24NA 9-1. CHANGE IN DEFROST SETTING (MUZ) Changing defrost finish temperature <JS> To change the defrost finish temperature, cut/solder the JS wire of the outdoor inverter P.C. board (Refer to ). Defrost finish temperature Jumper MUZ-GL09NAH MUY-GL09NA MUZ-GL12NAH MUY-GL12NA MUZ-GL15NAH MUY-GL15NA MUZ-GL18NAH MUY-GL18NA MUY-GL24NA MUZ-GL09/12/15NA MUZ-GL09/12/15NAH MUZ-GL18/24NA MUZ-GL18NAH JS Soldered (Initial setting) ne (Cut) 41 F (5 C) 50 F (10 C) 50 F (10 C) 64 F (18 C) 9-2. PRE-HEAT CONTROL SETTING (MUZ) MUZ-GL09/12/15/18 When moisture gets into the refrigerant cycle, it may interfere with the start-up of the compressor at low outside temperature. The pre-heat control prevents this interference. The pre-heat control turns ON when the discharge temperature thermistor is 68 F (20 C) or below. When the pre-heat control turns ON, the compressor is energized. (About 50 W) MUZ-GL24 Prolonged low load operation, in which the thermostat is OFF for a long time, at low outside temperature [32 F (0 C) or less] may cause the following troubles. To prevent those troubles, activate the pre-heat control. 1) If moisture gets into the refrigerant cycle and freezes, it may interfere the start-up of the compressor. 2) If liquid refrigerant collects in the compressor, a failure in the compressor may occur. The pre-heat control turns ON when the compressor temperature is 68 F (20 C) or below. When the pre-heat control turns ON, the compressor is energized. (About 70 W) Pre-heat control setting <JK> ON: To activate the pre-heat control, cut JK wire of the inverter P.C. board. OFF: To deactivate the pre-heat control, solder JK wire of the inverter P.C. board. (Refer to ) JK Jumper Soldered Cut MUZ-GL09/12/15/18NA MUZ-GL09/12/15/18NAH Deactivated (Factory setting) Activated Pre-heat control setting MUZ-GL24NA Deactivated Activated (Factory setting) NOTE: When the inverter P.C. board is replaced, check the jumper wires, and cut/solder them if necessary. 38

39 10 TROUBLESHOOTING MUZ-GL09NA MUZ-GL12NA MUZ-GL15NA MUZ-GL18NA MUZ-GL24NA MUZ-GL09NAH MUY-GL09NA MUZ-GL12NAH MUY-GL12NA MUZ-GL15NAH MUY-GL15NA MUZ-GL18NAH MUY-GL18NA MUY-GL24NA CAUTIONS ON TROUBLESHOOTING 1. Before troubleshooting, check the following 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for miswiring. 2. Take care of the following during servicing 1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, then after confirming the horizontal vane is closed, turn off the breaker and/or disconnect the power plug. 2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic control P.C. board. 3) When removing the electrical parts, be careful of the residual voltage of smoothing capacitor. 4) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the components. 5) When connecting or disconnecting the connectors, hold the connector housing. DO NOT pull the lead wires. <Incorrect> <Correct> Lead wiring Connector housing 3. Troubleshooting procedure 1) Check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality. To make sure, check how many times the OPERATION INDICATOR lamp is flashing on and off before starting service work. (See the service manual of the indoor unit for a description of those failure codes.) 2) Before servicing, check that the connector and terminal are connected properly. 3) When the electronic control P.C. board seems to be defective, check the copper foil pattern for disconnection and the components for bursting and discoloration. 4) Refer to 10-2 and

40 10-2. FAILURE MODE RECALL FUNCTION Outline of the function This air conditioner can memorize the abnormal condition which has occurred once. Even though LED indication listed on the troubleshooting check table (10-3.) disappears, the memorized failure details can be recalled. 1. Flow chart of failure mode recall function for the indoor/outdoor unit Operational procedure The cause of abnormality cannot be found because the abnormality does not recur. Setting up the failure mode recall function Turn ON the power supply. <Preparation of the remote controller> While pressing OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button. First, release RESET button. Hold down the other 2 buttons for another 3 seconds. Make sure that the indicators on the LCD screen shown in the right fi gure are all displayed. Then release the buttons. MSZ-GL06/09/12/15NA MSY-GL09/12/15NA MSZ-GL18NA MSY-GL18NA MSZ-GL24NA MSY-GL24NA Press STOP/OPERATE (OFF/ON) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit Regardless of normal or abnormal condition, a short beep is emitted once the signal is received. Does the upper lamp of the OPERATION INDICATOR lamp on the indoor unit blink at the interval of 0.5 seconds? Blinks: Either indoor or outdoor unit is abnormal. Beep is emitted at the same timing as the blinking of the upper lamp of the OPERATION INDICATOR lamp. 2 Judgment of indoor/outdoor abnormality (Blinks) Before blinking, does the upper lamp of the OPERATION INDICATOR lamp stay ON for 3 seconds? When it stays ON for 3 seconds (without beep): The outdoor unit is abnormal. (OFF) Indoor unit is normal. But the outdoor unit might be abnormal because there are some abnormalities that cannot be recalled with this way. Check if outdoor unit is abnormal according to the detailed outdoor unit failure mode recall function. (Refer to ) E.g.: MSZ type The indoor unit is abnormal. Check the blinking pattern, and identify the abnormal point by referring to the indoor unit failure mode table. (Refer to indoor unit service manual.) Make sure to check at least 2 consecutive blinking cycles. 2 The outdoor unit is abnormal. Check the blinking pattern, and identify the abnormal point by referring to the outdoor unit failure mode table. (Refer to ) Make sure to check at least 2 consecutive blinking cycles. 3 Releasing the failure mode recall function Release the failure mode recall function by the following procedures. Turn OFF the power supply and turn it ON again. Press RESET button of the remote controller. Repair the failure parts. Deleting the memorized abnormal condition After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall function" mentioned above. Press STOP/OPERATE (OFF/ON) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted. Release the failure mode recall function according to "Releasing the failure mode recall function" mentioned above. NOTE: 1. Make sure to release the failure mode recall function after it is set up, otherwise the unit cannot operate properly. 2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized. 2. Blinking pattern when the indoor unit is abnormal: 2.5-second OFF Blinking at 0.5- second interval 2.5-second OFF Blinking at 0.5- second interval ON OFF Beeps Repeated cycle Beeps Repeated cycle Beeps Repeated cycle 3.Blinking pattern when the outdoor unit is abnormal: Blinking at second OFF 3-second ON second interval 2.5-second OFF 3-second ON Blinking at 0.5- second interval ON OFF beep Repeated cycle Beeps 40 beep Repeated cycle Beeps Repeated cycle

41 2. Flow chart of the detailed outdoor unit failure mode recall function Operational procedure The outdoor unit might be abnormal. Check if outdoor unit is abnormal according to the following procedures. Make sure that the remote controller is set to the failure mode recall function. With the remote controller headed towards the indoor unit, press TOO COOL button to adjust the set temperature to 77 F (25 C) Regardless of normal or abnormal condition, 2 short beeps are emitted as the signal is received. Does the upper lamp of the OPERATION INDICATOR lamp on the indoor unit blink at the interval of 0.5 seconds? Blinks: The outdoor unit is abnormal. Beep is emitted at the same timing as the blinking of the upper lamp of the OPERATION INDICATOR lamp. 2 (OFF) (Blinks) The outdoor unit is abnormal. Check the blinking pattern, and identify the abnormal point by referring to the outdoor unit failure mode table ( ). Make sure to check at least 2 consecutive blinking cycles. 2 The outdoor unit is normal. Releasing the failure mode recall function Release the failure mode recall function by the following procedures. Turn OFF the power supply and turn it ON again. Press RESET button of the remote controller. Release the failure mode recall function according to the left mentioned procedure. Repair the failure parts. Deleting the memorized abnormal condition After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall function" ( ). Press STOP/OPERATE (OFF/ON) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted. Release the failure mode recall function according to "Releasing the failure mode recall function" mentioned above. NOTE: 1. Make sure to release the failure mode recall function after it is set up, otherwise the unit cannot operate properly. 2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized. 2.Blinking pattern when outdoor unit is abnormal: 2.5-second OFF 3-second ON Blinking at 0.5- second interval 2.5-second OFF 3-second ON Blinking at 0.5- second interval ON OFF beep Repeated cycle Beeps beep Repeated cycle Beeps Repeated cycle 41

42 3. Outdoor unit failure recall mode table The upper lamp of the OPERATION INDICATOR lamp (Indoor unit) Abnormal point (Failure mode/protection) LED indication (Outdoor P.C. board) Condition Remedy Indoor/outdoor unit failure mode recall function Outdoor unit failure mode recall function OFF ne (rmal) 1-time fl ash Indoor/outdoor Any signals from the inverter P.C. Refer to How 2.5 seconds OFF communication, receiving error board cannot be received normally for 3 minutes. to check miswiring and serial signal error. 2-time fl ash 2.5 seconds OFF 3-time fl ash 2.5 seconds OFF 4-time fl ash 2.5 seconds OFF 5-time fl ash 2.5 seconds OFF 6-time fl ash 2.5 seconds OFF 7-time fl ash 2.5 seconds OFF 8-time fl ash 2.5 seconds OFF 9-time fl ash 2.5 seconds OFF Indoor/outdoor communication, receiving error Outdoor power system Discharge temperature thermistor Defrost thermistor Fin temperature thermistor P.C. board temperature thermistor Ambient temperature thermistor Outdoor heat exchanger temperature thermistor Overcurrent Compressor synchronous abnormality (Compressor start-up failure protection) Discharge temperature High pressure Fin temperature/ P.C. board temperature Outdoor fan motor n-volatile memory data Power module (IC700) (MUZ-GL09/12/15/18, MUY- GL09/12/15/18) IGBT module (IC700) (MUZ-GL24, MUY-GL24) 1-time fl ash every 2.5 seconds 3-time fl ash 2.5 seconds OFF 4-time fl ash 2.5 seconds OFF 2-time fl ash 2.5 seconds OFF 11-time fl ash 2.5 seconds OFF 12-time fl ash 2.5 seconds OFF 7-time fl ash 2.5 seconds OFF 5-time fl ash 2.5 seconds OFF 6-time fl ash 2.5 seconds OFF Although the inverter P.C. board sends signal "0", signal "1" has been received 30 consecutive times. Overcurrent protection cut-out operates 3 consecutive times within 1 minute after the compressor gets started. Thermistor shorts or opens during compressor running. Large current fl ows into the power module (IC700) (MUZ-GL09/12/15/18, MUY-GL09/12/15/18)/ IGBT module (IC700) (MUZ-GL24, MUY-GL24). Waveform of compressor current is distorted. Temperature of discharge temperature thermistor exceeds 241 F (116 C), compressor stops. Compressor can restart if discharge temperature thermistor reads 212 F (100 C) or less 3 minutes later. Temperature indoor coil thermistor exceeds 158 F (70 C) in HEAT mode. Temperature defrost thermistor exceeds 158 F (70 C) in COOL mode. Temperature of the fin temperature thermistor on the inverter P.C. board exceeds F (75-86 C) (MUZ- GL09/12/15/18, MUY-GL09/12/15/18)/ F (75-80 C) (MUZ-GL24, MUY- GL24), or temperature of P.C. board temperature thermistor on the inverter P.C. board exceeds F (72-85 C) (MUZ-GL09/12/15/18, MUY- GL09/12/15/18)/ F (70-75 C) (MUZ-GL24, MUY-GL24). Outdoor fan has stopped 3 times in a row within 30 seconds after outdoor fan start-up. n-volatile memory data cannot be read properly. The interface short circuit occurs in the output of the power module (IC700) (MUZ-GL09/12/15/18, MUY- GL09/12/15/18)/IGBT module (IC700) (MUZ-GL24, MUY-GL24). The compressor winding shorts circuit. Refer to How to check miswiring and serial signal error. Reconnect connectors. Refer to "How to check inverter/ compressor". Check stop valve. Refer to "Check of outdoor thermistors". Defective outdoor thermistors can be identifi ed by checking the blinking pattern of LED. Reconnect compressor connector. Refer to "How to check inverter/ compressor". Check stop valve. Reconnect compressor connector. Refer to "How to check inverter/ compressor". Check refrigerant circuit and refrigerant amount. Refer to "Check of LEV". Check refrigerant circuit and refrigerant amount. Check stop valve. Check around outdoor unit. Check outdoor unit air passage. Refer to "Check of outdoor fan motor". Refer to "Check of outdoor fan motor". Refer to "Check of inverter P.C. board". Replace the inverter P.C. board. Refer to "How to check inverter/ compressor". NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-3.). 42

43 The upper lamp of the OPERATION INDICATOR lamp (Indoor unit) 10-time fl ash 2.5 seconds OFF 11-time fl ash 2.5 seconds OFF 14-time fl ash or more 2.5 seconds OFF Abnormal point (Failure mode/protection) Discharge temperature DC voltage Each phase current of compressor Stop valve (Closed valve) 4-way valve/ Pipe temperature Outdoor refrigerant system abnormality LED indication (Outdoor P.C. board) 8-time fl ash 2.5 seconds OFF 9-time fl ash 2.5 seconds OFF 14-time fl ash 2.5 seconds OFF 16-time fl ash 2.5 seconds OFF 17-time fl ash 2.5 seconds OFF Condition Temperature of discharge temperature thermistor has been 122 F (50 C) or less for 20 minutes. DC voltage of inverter cannot be detected normally. Each phase current of compressor cannot be detected normally. Closed valve is detected by compressor current. The 4-way valve does not work properly. The indoor coil thermistor detects an abnormal temperature. Remedy Indoor/outdoor unit failure mode recall function Outdoor unit failure mode recall function Refer to "Check of LEV". Check refrigerant circuit and refrigerant amount. Refer to "How to check inverter/ compressor". Check stop valve. Check the 4-way valve. Replace the inverter P.C. board. A closed valve and air trapped in the Check for a gas leak refrigerant circuit are detected based in a connecting piping on the temperature sensed by the etc. indoor and outdoor thermistors and the Check the stop valve. current of the compressor. Refer to Check of outdoor refrigerant circuit. NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-3.). 43

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