service manual no. obh733 revised edition-f indoor unit service manual msz-gl•na, msy-gl•na series (obh732) muz-gl18/24na muz-gl18/24nah muy-gl18/24na parts catalog (obb733) models muz-gl09na - u1 muz-gl09nah - u1 muy-gl09na - u1 muz-gl09na - u8 muz-gl09nah - u8 muz-gl12na - u1 muz-gl12nah - u1 muy-gl12na - u1 muz-gl15na - u1 muz-gl15nah ...
SERVICE MANUAL No. OBH733 REVISED EDITION-F Indoor unit service manual MSZ-GL•NA, MSY-GL•NA Series (OBH732) MUZ-GL18/24NA MUZ-GL18/24NAH MUY-GL18/24NA PARTS ...
DISASSEMBLY INSTRUCTIONS ···················· 64 OUTDOOR UNIT. 2 1 TECHNICAL CHANGES Use the specifi ed 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.
Revision F: · MUZ-GL24NA- U2 has been added. OBH733 REVISED EDITION-E is void. IONUDTODOOROURNUITNIT SERVICE MANUAL HFC utilized R410A No. OBH733 REVISED EDITION-F Models MUZ-GL09NA - U1 MUZ-GL09NAH - U1 MUY-GL09NA - U1 MUZ-GL09NA - U8 MUZ-GL09NAH - U8 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 U2 MUZ-GL24NAH - U1 MUY-GL24NA - U1 MUZ-GL18/24NA MUZ-GL18/24NAH MUY-GL18/24NA Indoor unit service manual MSZ-GL·NA, MSY-GL·NA Series (OBH732) 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 ············· 21 7. DATA································································ 24 8. ACTUATOR CONTROL··································· 39 9. SERVICE FUNCTIONS ··································· 40 10. TROUBLESHOOTING····································· 41 11. DISASSEMBLY INSTRUCTIONS ···················· 64 PARTS CATALOG (OBB733) 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. Revision C: · MUZ-GL09NA- U1 and MUZ-GL09NAH- U1 have been added. Revision D: · MUZ-GL24NAH- U1 has been added. Revision E: · Capacity corrections have been corrected [7-1. 2), 3)]. Revision F: · MUZ-GL24NA- U2 has been added. 1 TECHNICAL CHANGES MUZ-GL09NA - U1 MUZ-GL09NAH - U1 MUZ-GL09NA - U8 MUZ-GL09NAH - U8 MUZ-GL12NA - U1 MUZ-GL12NAH - U1 MUZ-GL15NA - U1 MUZ-GL15NAH - U1 MUZ-GL18NA - U1 MUZ-GL18NAH - U1 MUZ-GL24NA - U1 , U2 MUZ-GL24NAH - U1 1. New model MUY-GL09NA - U1 MUY-GL12NA - U1 MUY-GL15NA - U1 MUY-GL18NA - U1 MUY-GL24NA - U1 OBH733F 2 2 PART NAMES AND FUNCTIONS MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA Air inlet (back and side) Piping Air outlet Drain hose Drain outlet MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA Air inlet (back and side) Piping Drain hose Air outlet Drain outlet OBH733F 3 3 SPECIFICATION Outdoor unit model MUZ- MUZ- GL09NA- U1 GL09NA- U8 MUZ- MUZ- GL09NAH- U1 GL09NAH- U8 MUYGL09NA MUZGL12NA MUZGL12NAH MUYGL12NA Capacity Rated (Minimum~Maximum) Cooling 1 Btu/h Heating 47 1 (MUZ) Btu/h Capacity Rated (Maximum) Heating 17 2 (MUZ) Btu/h 9,000 (3,600 - 12,200) 10,900 10,900 (4,500 - 15,900) (4,500 - 14,100) - 6,700 (10,200) 7,000 (9,400) - 12,000 (1,500 - 13,600) 14,400 (2,000 - 18,100) - 9,200 (12,000) - Power consumption Rated (Minimum~Maximum) Cooling 1 W Heating 47 1 (MUZ) W 585 (240 - 1,050) 720 720 (230 - 1,250) (230 - 1,070) - 920 (100 - 1,300) 1,100 (110 - 1,620) - Power consumption Heating 17 2 (MUZ) W Rated (Maximum) 630 (1,060) 620 (790) - 870 (1,240) - EER 1 [SEER] 3 Cooling HSPF IV 4 Heating (MUZ) 15.4 [24.6] 13.0 [23.1] NA: 12.8 - NA: 12.5 - NAH: 11.8 - NAH: 11.5 - COP Heating 1 (MUZ) 4.44 - 3.84 - Power factor Cooling (208/230) % Heating (MUZ) (208/230) % 86/86 90/90 92/92 95/95 87/87 - 95/95 96/96 Power supply V , phase , Hz 208/230, 1 , 60 Max. fuse size (time delay) A 15 Min. circuit ampacity A 9 7 9 7 Fan motor F.L.A A 0.50 Model KNB073FRVMC SNB092FQAMT KNB073FRVMC SNB092FQAMT Compressor R.L.A L.R.A A A 6.2 7.7 4.9 6.6 4.9 6.1 8.2 6.1 Refrigeration oil fl oz. (L) (Model) 9.1 (0.27)/(FV50S) 11.8 (0.35)/(FV50S) 9.1 (0.27)/(FV50S) 11.8 (0.35)/(FV50S) Refrigerant control Linear expansion valve Sound level 1 Cooling Heating (MUZ) dB(A) dB(A) 48 49 49 50 - 51 - Airflow High - Med. - Low Cooling Heating (MUZ) CFM CFM 1,186 - 1,116 - 1,045 1,102 - 639 - 1,186 - 1,116 - 1,045 - Fan speed Cooling rpm High - Med. - Low Heating (MUZ) rpm 870 - 820 - 770 810 - 490 - 870 - 820 - 770 - Defrost method Reverse cycle W in. 31-1/2 Dimensions D in. 11-1/4 H in. 21-5/8 Weight Ib. 81 External finish Munsell 3Y 7.8/1.1 Remote controller Wireless type Control voltage (by built-in transformer) V DC 12 - 24 Refrigerant piping Not supplied Refrigerant pipe size Liquid in. (Min. wall thickness) Gas in. 1/4 (0.0315) 3/8 (0.0315) Connection method Indoor Outdoor Flared Flared Between the indoor Height difference ft. 40 & outdoor units Piping length ft. 65 Refrigerant charge (R410A) 2 lb. 5 oz. 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.) OBH733F 4 Outdoor unit model MUZGL15NA MUZGL15NAH MUYGL15NA MUZGL18NA MUZGL18NAH MUYGL18NA MUZGL24NA MUZGL24NAH MUYGL24NA Capacity Rated (Minimum~Maximum) Cooling 1 Btu/h Heating 47 1 (MUZ) Btu/h 14,000 (3,100 - 18,200) 18,000 (5,800 ~ 22,000) 22,500 (8,200 ~ 31,400) 18,000 (4,800 - 20,900) - 21,600 (5,400 ~ 25,000) - 27,600 (7,500 ~ 36,900) - Capacity Rated (Maximum) Heating 17 2 (MUZ) Btu/h 12,200 (16,400) - 13,800 (18,200) - 16,000 (24,600) - Cooling 1 W Power consumption Rated (Minimum~Maximum) Heating 47 1 (MUZ) W 1,080 (210 - 2,000) 1,600 (200 ~ 2,010) - 1,340 (330 ~ 2,150) 1,680 (320 ~ 2,500) 1,800 (570 ~ 3,580) 2,340 (520 ~ 3,650) Power consumption Heating 17 2 (MUZ) W Rated (Maximum) 1,190 (1,850) - 1,480 (2,150) - 1,770 (3,290) - EER 1 [SEER] 3 Cooling HSPF IV 4 Heating (MUZ) 13.0 [21.6] NA: 11.7 - NAH: 10.8 - 13.4 [20.5] NA: 11.2 - NAH: 10.2 - 12.5 [20.5] NA: 10.0 - NAH: 10.0 - COP Heating 1 (MUZ) 3.30 - 3.77 - 3.46 - Power factor Cooling (208/230) % Heating (MUZ) (208/230) % 97/97 98/98 99/99 99/99 - 99/99 99/99 - Power supply V , phase , Hz 208/230, 1 , 60 Max. fuse size (time delay) A 15 20 Min. circuit ampacity A 10 9 14 17.1 Fan motor F.L.A 0.50 0.93 0.93 Model SNB130FQBMT SNB130FQBMT SNB172FQKMT R.L.A A 7.4 6.8 10 12.9 Compressor L.R.A A 9.3 8.5 12.5 16.1 Refrigeration oil fl oz. (L) (Model) 11.8 (0.35)/(FV50S) 11.8 (0.35)/(FV50S) 11.8 (0.35)/(FV50S) 13.5 (0.40)/(FV50S) Refrigerant control Linear expansion valve Cooling dB(A) 49 49 Sound level 1 Heating (MUZ) dB(A) 51 - 54 55 - 55 55 - Airflow COOL High - Med. - Low HEAT CFM 1,102-639 CFM 1,186 - 1,045 - 1,045 - 1,742 - 922 1,691 - 1,691 - 1,372 - 2,016 - 1,769 - 890 1,701 - 1,701 - 1,341 - Fan speed Cooling High - Med. - Low Heating (MUZ) rpm 810 - 490 rpm 870 - 770 - 770 - 840 - 450 810 - 810 - 650 - 950 - 840 - 450 810 - 810 - 650 - Defrost method Reverse cycle W in. 31-1/2 33-1/16 Dimensions D in. 11-1/4 13 H in. 21-5/8 34-5/8 Weight Ib. 81 121 119 External finish Munsell 3Y 7.8/1.1 Remote controller Wireless type Control voltage (by built-in transformer) V DC 12 - 24 Refrigerant piping Not supplied Refrigerant pipe size Liquid in. (Min. wall thickness) Gas in. 1/4 (0.0315) 1/2 (0.0315) 3/8 (0.0315) 5/8 (0.0315) Indoor Connection method Outdoor Flared Flared Between the indoor Height difference ft. 40 50 & outdoor units Piping length ft. 65 100 Refrigerant charge (R410A) 2 lb. 9 oz. 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.) OBH733F 5 Test condition 3, 4 ARI Mode Test "A-2" Cooling Steady State at rated compressor Speed Indoor air condition (°F) Dry bulb Wet bulb 80 67 Outdoor air condition (°F) Dry bulb Wet bulb 95 (75) "B-2" Cooling Steady State at rated compressor Speed 80 67 82 (65) SEER "B-1" Cooling Steady State (Cooling) at minimum compressor Speed 80 67 82 (65) "F-1" Cooling Steady State at minimum compressor Speed 80 67 67 (53.5) "E-V" Cooling Steady State at intermediate compressor Speed 5 80 67 87 (69) "H1-2" Heating Steady State at rated compressor Speed 70 60 47 43 "H3-2" Heating at rated compressor Speed 70 60 17 15 HSPF "H0-1" Heating Steady State (Heating) at minimum compressor Speed 70 60 62 56.5 "H1-1" Heating Steady State at minimum compressor Speed 70 60 47 43 "H2-V" Heating at intermediate compressor Speed 5 70 60 35 33 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. 187 208 230 Max. 253 (2) OPERATION Mode Condition Standard temperature Cooling Maximum temperature Minimum temperature Maximum humidity Standard temperature Heating Maximum temperature Minimum temperature Intake air temperature (°F) Indoor Outdoor DB WB DB WB 80 67 95 -- 90 73 115 -- 67 57 14 -- 78 % -- 70 60 47 43 80 67 75 65 70 60 -4 -5 OBH733F 6 4 OUTLINES AND DIMENSIONS MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA REQUIRED SPACE *1 4 in. (100 mm) or more when front and sides of the unit are clear 4 in. or (m1o0r0emm) clear *1 Unit: inch 4 in. o(1r0m0omrem) (GL09/12/15NA) (GL09/12/15NAH) holes 8 ino.r(m20o0rem*m2) 14 ionr. m(3o5r0e mm) *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 Gas refrigerant pipe joint Refrigerant pipe (flared) Ø 3/8 (GL09/12) Ø 1/2 (GL15) OBH733F 7 MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA Unit: inch 13 2 16-7/16 Air in Air in 6-7/8 Air out 19-11/16 33-1/16 4-5/16 14-3/16 Clear *1 REQUIRED SPACE *1 20 in. (500 mm) or more when front and sides of the unit are clear Drain hole 1-5/8 1-9/16 4 or mino. r(e100 mm) 4 oinr.m(1o0r0e mm) 2-holes 13/32 13/16 3-3/16 20orinm. (o5r0e0*2mm) o1r 4mionr.e(350 mm) *2 When any 2 sides of left, right and rear of the unit are clear Service panel Liquid refrigerant pipe joint Refrigerant pipe (flared) Ø 1/4 (GL18) Refrigerant pipe (flared) Ø 3/8 (GL24) 34-5/8 17-25/32 35 44 6-1/2 3-29/32 7-11/16 Gas refrigerant pipe joint Refrigerant pipe (flared) Ø 1/2 (GL18) Refrigerant pipe (flared) Ø 5/8 (GL24) OBH733F 8 5 WIRING DIAGRAM MUZ-GL09NA MUZ-GL12NA OBH733F 9 MUZ-GL09NAH MUZ-GL12NAH OBH733F 10 MUY-GL09NA MUY-GL12NA OBH733F 11 MUZ-GL15NA OBH733F 12 MUZ-GL15NAH OBH733F 13 MUY-GL15NA OBH733F 14 MUZ-GL18NA OBH733F 15 MUZ-GL18NAH OBH733F 16 MUY-GL18NA OBH733F 17 MUZ-GL24NA OBH733F 18 MUZ-GL24NAH OBH733F 19 MUY-GL24NA OBH733F 20 6 REFRIGERANT SYSTEM DIAGRAM MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA 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 Flared connection Capillary tube O.D. 0.118 × I.D. 0.079 × 9-7/16 (ø3.0 × ø2.0 × 240) (MUZ-GL09NA/H - U1 ) Capillary tube O.D. 0.157 × I.D. 0.094 × 9-7/16 (ø4.0 × ø2.4 × 240) LEV (Other models ) Stop valve (with strainar) Refrigerant pipe ø1/4 (ø6.35) (with heat insulator) Muffler Service port Outdoor heat exchanger Outdoor heat exchanger temperature thermistor RT68 Compressor Defrost thermistor RT61 (MUZ) Capillary tube O.D. 0.118 × I.D. 0.079 × 8-9/32 (ø3.0 × ø2.0 × 210) Ambient temperature thermistor RT65 Strainer #100 R.V. coil (MUZ) heating ON cooling OFF Refrigerant flow in cooling Refrigerant flow in heating (MUZ) MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA Refrigerant pipe ø1/2 (ø12.7) (with heat insulator) 4-way valve Muffler with #100 mesh strainer Flared connection Stop valve (with service port) Service port Discharge temperature thermistor RT62 Service port Defrost thermistor RT61 (MUZ) Outdoor heat exchanger Unit: Inch (mm) Flared connection Strainer #100 Stop valve Refrigerant pipe ø1/4 (ø6.35) (with heat insulator) Muffler Compressor Capillary tube O.D. 0.118× I.D. 0.079× 7-7/8 (ø3.0×ø2.0×200(×4)) LEV Strainer #100 Capillary tube O.D. 0.157× I.D. 0.094× 3-15/16 (ø4.0×ø2.4×100) Capillary tube O.D. 0.157× I.D. 0.094×7-7/8 (ø4.0×ø2.4×200) Outdoor heat exchanger temperature thermistor RT68 R.V. coil (MUZ) heating ON cooling OFF Refrigerant flow in cooling Refrigerant flow in heating (MUZ) OBH733F 21 MUZ-GL24NA - U1 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 Unit: inch Flared connection Strainer #100 Stop valve Refrigerant pipe ø3/8 (ø9.52) (with heat insulator) Compressor Outdoor heat exchanger temperature thermistor RT68 LEV Strainer #100 R.V. coil (MUZ) heating ON Capillary tube cooling OFF O.D.0.157 × I.D.0.094 × 3-15/16 Refrigerant flow in cooling (ø4.0×ø2.4×100) Refrigerant flow in heating (MUZ) MUZ-GL24NA - U2 MUZ-GL24NAH Refrigerant pipe ø5/8 (ø15.88) (with heat insulator) Muffler 4-way valve #100 Service port Flared connection Stop valve (with service port) Discharge temperature Service port thermistor RT62 Defrost thermistor RT61 Outdoor heat exchanger Ambient temperature thermistor RT65 Flared connection Strainer #100 CHECK VALVE Stop valve Refrigerant pipe ø3/8 (ø9.52) Capillary tube (with heat insulator) O.D.0.118 × I.D.0.071 × 21-21/32 (ø3.0×ø1.8×550) Compressor LEV Strainer #100 Capillary tube O.D.0.157 × I.D.0.094 × 3-15/16 (ø4.0×ø2.4×100) Outdoor heat exchanger temperature thermistor RT68 R.V. coil heating ON cooling OFF Refrigerant flow in cooling Refrigerant flow in heating OBH733F 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 MUZ-GL24NAH MUY-GL24NA Refrigerant piping: ft. Max. Length A Max. Height difference B 65 40 100 50 Piping size O.D: in. Gas Liquid 3/8 1/4 1/2 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 Outdoor unit precharged 25 Refrigerant piping length (one way): ft. 30 40 50 60 65 MUZ-GL09NA - U1 MUZ-GL09NAH - U1 2 lb. 5 oz. MUZ-GL09NA - U8 MUZ-GL09NAH - U8 MUY-GL09NA MUZ-GL12NA 0 MUZ-GL12NAH 2 lb. 9 oz. MUY-GL12NA MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA 1.08 3.24 5.40 7.56 8.64 Calculation: X oz. = 1.08/5 oz./ft. × (Refrigerant piping length (ft.) - 25) OBH733F 23 NOTE: Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation. Model Outdoor unit precharged 25 MUZ-GL18NA MUZ-GL18NAH 3 lb. 9 oz. 0 MUY-GL18NA Refrigerant piping length (one way): ft. 30 40 50 60 70 80 90 100 1.08 3.24 5.40 7.56 9.72 11.88 14.04 16.20 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 Outdoor unit precharged 33 MUZ-GL24NA MUZ-GL24NAH 4 lb. 3 oz. 0 MUY-GL24NA Refrigerant piping length (one way): ft. 40 50 60 70 80 90 100 4.14 10.06 15.98 21.90 27.82 33.74 39.66 Calculation: X oz. = 2.96/5 oz./ft. × (Refrigerant piping length (ft.) - 33) 7 DATA MUZ-GL09NA MUZ-GL12NA MUZ-GL15NA MUZ-GL18NA MUZ-GL24NA MUZ-GL09NAH MUZ-GL12NAH MUZ-GL15NAH MUZ-GL18NAH MUZ-GL24NAH MUY-GL09NA MUY-GL12NA MUY-GL15NA MUY-GL18NA MUY-GL24NA 7-1. PERFORMANCE DATA 1) COOLING CAPACITY Indoor air Outdoor intake air DB temperature (°F) Model 75 85 95 105 115 IWB (°F) TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC MUZ-GL09NA 71 11.0 7.6 0.52 10.3 7.1 0.57 9.7 6.6 0.61 9.0 6.2 0.65 8.3 5.7 0.67 MUZ-GL09NAH 67 10.4 8.6 0.49 9.7 8.0 0.54 9.0 7.4 0.59 8.4 6.9 0.62 7.7 6.3 0.65 MUY-GL09NA 63 9.8 9.4 0.47 9.1 8.7 0.52 8.5 8.1 0.56 7.7 7.3 0.60 7.0 6.7 0.62 MUZ-GL12NA 71 14.7 9.4 0.82 13.7 8.7 0.90 12.9 8.2 0.97 12.0 7.6 1.02 11.0 7.0 1.06 MUZ-GL12NAH 67 13.9 10.7 0.77 13.0 10.0 0.85 12.0 9.2 0.92 11.2 8.6 0.98 10.3 7.9 1.02 MUY-GL12NA 63 13.1 11.8 0.74 12.1 10.9 0.81 11.3 10.2 0.88 10.3 9.3 0.94 9.4 8.5 0.98 MUZ-GL15NA 71 17.2 9.7 0.96 16.0 9.1 1.05 15.1 8.5 1.13 14.0 7.9 1.19 12.9 7.3 1.24 MUZ-GL15NAH 67 16.2 11.4 0.91 15.1 10.6 1.00 14.0 9.8 1.08 13.0 9.1 1.14 12.0 8.4 1.20 MUY-GL15NA 63 15.3 12.7 0.86 14.1 11.8 0.96 13.2 11.0 1.03 12.0 10.0 1.10 10.9 9.1 1.14 MUZ-GL18NA 71 22.1 16.2 1.19 20.6 15.2 1.31 19.4 14.3 1.41 18.0 13.3 1.48 16.6 12.2 1.54 MUZ-GL18NAH 67 20.9 18.2 1.13 19.4 16.9 1.24 18.0 15.7 1.34 16.7 14.6 1.42 15.4 13.4 1.49 MUY-GL18NA 63 19.6 19.7 1.07 18.2 18.2 1.19 16.9 17.0 1.28 15.4 15.4 1.37 14.0 14.1 1.42 MUZ-GL24NA 71 27.6 17.0 1.60 25.8 15.9 1.76 24.2 14.9 1.89 22.5 13.9 1.99 20.7 12.8 2.07 MUZ-GL24NAH 67 26.1 19.6 1.51 24.3 18.2 1.67 22.5 16.9 1.80 20.9 15.7 1.91 19.2 14.4 2.00 MUY-GL24NA 63 24.5 21.7 1.44 22.7 20.1 1.59 21.2 18.7 1.72 19.2 17.0 1.84 17.6 15.5 1.91 NOTE: 1. IWB : Intake air wet-bulb temperature TC : Total Capacity (x103 Btu/h) SHC : Sensible Heat Capacity (x103 Btu/h) TPC : Total Power Consumption (kW) 2. SHC is based on 80°F of indoor Intake air DB temperature. OBH733F 24 2) COOLING CAPACITY CORRECTIONS Refrigerant piping length (one way: ft.) 25 (std.) 40 65 MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA MUZ-GL12NA MUZ-GL12NAH 1.0 MUY-GL12NA MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA 0.988 0.967 MUZ-GL18NA MUZ-GL18NAH 1.0 MUY-GL18NA 0.985 0.963 MUZ-GL24NA MUZ-GL24NAH 1.0 MUY-GL24NA 0.983 0.956 3) HEATING CAPACITY CORRECTIONS Refrigerant piping length (one way: ft.) MUZ-GL09NA MUZ-GL09NAH MUZ-GL12NA MUZ-GL12NAH MUZ-GL15NA MUZ-GL15NAH 25 (std.) 1.0 40 0.997 65 0.993 MUZ-GL18NA MUZ-GL18NAH MUZ-GL24NA 1.0 MUZ-GL24NAH 0.997 0.993 100 - 0.933 0.921 100 0.987 OBH733F 25 4) HEATING CAPACITY (MUZ) Indoor air Outdoor intake air WB temperature (°F) Model 5 15 25 35 43 IDB (°F) TC TPC TC TPC TC TPC TC TPC TC TPC MUZ-GL09NA 75 4.8 0.42 6.3 0.54 7.9 0.63 9.4 0.70 10.6 0.74 70 5.2 0.41 6.7 0.52 8.2 0.62 9.6 0.68 10.9 0.72 65 5.5 0.39 6.9 0.50 8.6 0.59 10.0 0.67 11.2 0.70 MUZ-GL12NA 75 6.3 0.65 8.4 0.82 10.4 0.96 12.5 1.07 14.0 1.13 70 6.8 0.62 8.9 0.79 10.8 0.94 12.7 1.05 14.4 1.10 65 7.2 0.59 9.1 0.76 11.3 0.91 13.2 1.02 14.8 1.07 75 MUZ-GL09NAH 70 4.8 0.55 6.3 0.67 7.9 0.76 9.4 0.70 10.6 0.74 5.2 0.54 6.7 0.65 8.2 0.75 9.6 0.68 10.9 0.72 65 5.5 0.52 6.9 0.63 8.6 0.72 10.0 0.67 11.2 0.70 75 MUZ-GL12NAH 70 6.3 0.78 8.4 0.95 10.4 1.09 12.5 1.07 14.0 1.13 6.8 0.75 8.9 0.92 10.8 1.07 12.7 1.05 14.4 1.10 65 7.2 0.72 9.1 0.89 11.3 1.04 13.2 1.02 14.8 1.07 MUZ-GL15NA 75 7.9 0.94 10.4 1.19 13.1 1.40 15.6 1.56 17.6 1.64 70 8.6 0.90 11.1 1.15 13.5 1.37 15.9 1.52 18.0 1.60 65 9.0 0.86 11.3 1.10 14.1 1.32 16.5 1.48 18.5 1.56 75 MUZ-GL15NAH 70 7.9 1.07 10.4 1.32 13.1 1.53 15.6 1.56 17.6 1.64 8.6 1.03 11.1 1.28 13.5 1.50 15.9 1.52 18.0 1.60 65 9.0 0.99 11.3 1.23 14.1 1.45 16.5 1.48 18.5 1.56 MUZ-GL18NA 75 9.5 0.99 12.5 1.25 15.7 1.47 18.7 1.64 21.1 1.72 70 10.3 0.95 13.3 1.21 16.2 1.44 19.1 1.60 21.6 1.68 65 10.8 0.91 13.6 1.16 17.0 1.39 19.8 1.55 22.2 1.64 75 9.5 1.12 12.5 1.38 15.7 1.60 18.7 1.64 21.1 1.72 MUZ-GL18NAH 70 10.3 1.08 13.3 1.34 16.2 1.57 19.1 1.60 21.6 1.68 65 10.8 1.04 13.6 1.29 17.0 1.52 19.8 1.55 22.2 1.64 MUZ-GL24NA 75 12.1 1.38 16.0 1.74 20.0 2.05 23.9 2.28 26.9 2.40 70 13.1 1.32 17.0 1.68 20.7 2.00 24.4 2.22 27.6 2.34 65 13.8 1.26 17.4 1.61 21.7 1.93 25.3 2.16 28.4 2.28 75 12.1 1.38 16.0 1.74 20.0 2.05 23.9 2.28 26.9 2.40 MUZ-GL24NAH 70 13.1 1.32 17.0 1.68 20.7 2.00 24.4 2.22 27.6 2.34 65 13.8 1.26 17.4 1.61 21.7 1.93 25.3 2.16 28.4 2.28 NOTE: 1. IDB : Intake air dry-bulb temperature TC : Total Capacity (x103 Btu/h) TPC : Total Power Consumption (kW) 2. Above data is for heating operation without any frost. 45 TC TPC 11.0 0.75 11.2 0.73 11.6 0.71 14.5 1.14 14.8 1.12 15.3 1.09 11.0 0.75 11.2 0.73 11.6 0.71 14.5 1.14 14.8 1.12 15.3 1.09 18.1 1.66 18.5 1.63 19.1 1.58 18.1 1.66 18.5 1.63 19.1 1.58 21.7 1.75 22.2 1.71 22.9 1.66 21.7 1.75 22.2 1.71 22.9 1.66 27.7 2.43 28.4 2.39 29.3 2.32 27.7 2.43 28.4 2.39 29.3 2.32 55 TC TPC 12.4 0.78 12.7 0.76 13.0 0.75 16.4 1.19 16.8 1.17 17.1 1.14 12.4 0.78 12.7 0.76 13.0 0.75 16.4 1.19 16.8 1.17 17.1 1.14 20.5 1.73 21.0 1.70 21.4 1.66 20.5 1.73 21.0 1.70 21.4 1.66 24.6 1.81 25.2 1.78 25.7 1.75 24.6 1.81 25.2 1.78 25.7 1.75 31.5 2.53 32.2 2.48 32.8 2.43 31.5 2.53 32.2 2.48 32.8 2.43 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. OBH733F 26 7-2. PERFORMANCE CURVE Cooling Cooling capacity (at Rated frequency) 1.5 1.4 Indoor intake air Wet-bulb temperature( F) 1.3 Capacity correction factors 1.2 79 1.1 75 1.0 0.9 72 68 64 14 23 32 41 50 59 68 77 86 95 104 113 Outdoor intake air DB temperature(°F) MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA Total power consumption (kW) 0.7 0.6 0.5 0.4 0.3 0.2 65 SHF at rating condition = 0.82 Airflow = 399 CFM 71 67 63 Indoor intake air WB temperature (°F) 75 85 95 105 115 Outdoor intake air DB temperature (°F) MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA Total power consumption (kW) 1.1 1.0 0.9 0.8 0.7 0.6 65 SHF at rating condition = 0.77 Airflow = 399 CFM 71 67 63 Indoor intake air WB temperature (°F) 75 85 95 105 115 Outdoor intake air DB temperature (°F) MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA Total power consumption (kW) 1.5 1.4 1.3 1.2 1.1 1.0 0.9 0.8 0.7 65 SHF at rating condition = 0.78 Airflow = 533 CFM 71 67 63 Indoor intake air WB temperature (°F) 75 85 95 105 115 Outdoor intake air DB temperature (°F) MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA Total power consumption (kW) 1.6 1.5 1.4 1.3 1.2 1.1 1.0 0.965 SHF at rating condition = 0.87 Airflow = 646 CFM 71 67 63 Indoor intake air WB temperature (°F) 75 85 95 105 115 Outdoor intake air DB temperature (°F) MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA Total power consumption (kW) 2.2 2.1 2.0 1.9 1.8 1.7 1.6 1.5 1.4 1.3 65 SHF at rating condition = 0.75 Airflow = 634 CFM 71 67 63 Indoor intake air WB temperature (°F) 75 85 95 105 115 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. OBH733F 27 Heating Capacity correction factor Heating capacity (at Rated frequency) 1.3 59 68 1.2 1.1 1.0 0.9 0.8 0.7 Indoor intake air Dry-bulb temperature ( F) 79 0.6 0.5 0.4 -4 5 14 23 32 41 50 59 Outdoor intake air WB temperature (°F) MUZ-GL09NA Total power consumption (kW) 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 -5 Airflow = 406 CFM 75 70 65 Indoor intake air DB temperature (°F) 5 15 25 35 45 55 65 Outdoor intake air WB temperature (°F) MUZ-GL09NAH 1.0 Airflow = 406 CFM Total power consumption (kW) 0.8 75 70 65 0.6 0.4 Indoor intake air DB temperature (°F) 0.2-5 5 15 25 35 45 55 65 Outdoor intake air WB temperature (°F) MUZ-GL12NA Total power consumption (kW) 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 -5 Airflow = 406 CFM 75 70 65 Indoor intake air DB temperature (°F) 5 15 25 35 45 55 65 Outdoor intake air WB temperature (°F) MUZ-GL15NA Total power consumption (kW) 2.0 1.7 1.4 1.1 0.8 0.5 -5 Airflow = 463 CFM 75 70 65 Indoor intake air DB temperature (°F) 5 15 25 35 45 55 65 Outdoor intake air WB temperature (°F) MUZ-GL12NAH 1.6 Airflow = 406 CFM Total power consumption (kW) 1.3 75 70 65 1.0 0.7 Indoor intake air DB temperature (°F) 0.4-5 5 15 25 35 45 55 65 Outdoor intake air WB temperature (°F) MUZ-GL15NAH Total power consumption (kW) Airflow = 463 CFM 1.8 75 70 65 1.5 1.2 0.9 0.6 -5 Indoor intake air DB temperature (°F) 5 15 25 35 45 55 65 Outdoor intake air WB temperature (°F) OBH733F 28 MUZ-GL18NA Total power consumption (kW) 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6-5 Airflow = 646 CFM 75 70 65 Indoor intake air DB temperature (°F) 5 15 25 35 45 55 65 Outdoor intake air WB temperature (°F) MUZ-GL18NAH 1.9 1.6 Airflow = 646 CFM 75 70 65 Total power consumption (kW) 1.3 1.0 0.7 -5 Indoor intake air DB temperature (°F) 5 15 25 35 45 55 65 Outdoor intake air WB temperature (°F) Total power consumption (kW) MUZ-GL24NA 3.0 2.6 2.2 Airflow = 738 CFM 75 70 65 1.8 1.4 Indoor intake air DB temperature (°F) 1.0 0 10 20 30 40 50 60 70 Outdoor intake air WB temperature (°F) MUZ-GL24NAH 2.8 2.3 Airflow = 738 CFM 75 70 65 Total power consumption (kW) 1.8 1.3 0.8-5 Indoor intake air DB temperature (°F) 5 15 25 35 45 55 65 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. OBH733F 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 86 400 350 Indoor DB temperature (°F) 80 75 70 (PSIG) 180 160 Suction pressure Condensing pressure 140 300 120 100 250 80 20065 70 75 80 85 90 95 100 105 (°F) 6065 Outdoor ambient temperature 86 80 75 70 Indoor DB temperature (°F) 70 75 80 85 90 95 100 105 (°F) Outdoor ambient temperature MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA (PSIG) 500 Suction pressure Condensing pressure 450 400 Indoor DB temperature (°F) 350 86 80 (PSIG) 75 70 180 160 140 300 120 100 250 80 20065 70 75 80 85 90 95 100 105 (°F) 6065 Outdoor ambient temperature 86 80 75 70 Indoor DB temperature (°F) 70 75 80 85 90 95 100 105 (°F) Outdoor ambient temperature MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA (PSIG) 500 450 400 Indoor DB temperature (°F) 86 80 75 70 (PSIG) 180 160 350 140 Suction pressure Condensing pressure 300 120 100 250 80 20065 70 75 80 85 90 95 100 105 (°F) 6065 Outdoor ambient temperature 86 80 75 70 Indoor DB temperature (°F) 70 75 80 85 90 95 100 105 (°F) Outdoor ambient temperature OBH733F 30 MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA (PSIG) 500 Suction pressure Condensing pressure 450 400 Indoor DB temperature (°F) 350 300 86 80 75 (PSIG) 70 180 160 140 120 250 100 86 80 75 70 Indoor DB temperature (°F) 20065 70 75 80 85 90 95 100 105 (°F) 8065 70 75 80 85 90 95 100 105 (°F) Outdoor ambient temperature Outdoor ambient temperature MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA (PSIG) 480 86 80 450 75 70 420 390 360 Indoor DB temperature (°F) Condensing pressure 330 300 270 68 70 75 80 85 90 95 Outdoor ambient temperature 100 105(°F) Suction pressure (PSIG) 180 86 170 160 80 150 75 140 70 130 Indoor DB temperature (°F) 120 110 68 70 75 80 85 90 95 Outdoor ambient temperature 100 105(°F) OBH733F 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 - U1 MUZ-GL09NAH - U1 (PSIG) 450 (PSIG) 200 75 70 400 350 Indoor DB temperature (°F) 75 70 150 65 Indoor DB temperature (°F) 65 100 300 Suction pressure Condensing pressure 50 250 58Hz 58Hz 200 5 0 15 25 35 45 55 65 75 (°F) 5 Outdoor ambient temperature 15 25 35 45 55 65 Outdoor ambient temperature MUZ-GL09NA - U8 MUZ-GL09NAH - U8 MUZ-GL12NA MUZ-GL12NAH (PSIG) 500 (PSIG) 190 450 400 350 Indoor DB temperature (°F) 300 Suction pressure 165 75 70 140 65 115 90 Indoor DB temperature (°F) 75 (°F) 75 70 65 Condensing pressure 250 200 5 65 58Hz 40 15 25 35 45 55 65 75 (°F) 5 Outdoor ambient temperature 58Hz 15 25 35 45 55 65 75 (°F) Outdoor ambient temperature OBH733F 32 MUZ-GL15NA MUZ-GL15NAH (PSIG) 500 450 Indoor DB temperature (°F) 400 Condensing pressure 350 300 250 5 58Hz 15 25 35 45 55 65 Outdoor ambient temperature 75 70 65 (PSIG) 190 165 Suction pressure 140 115 90 65 40 75 (°F) 5 75 70 65 Indoor DB temperature (°F) 58Hz 15 25 35 45 55 65 75 (°F) Outdoor ambient temperature MUZ-GL18NA MUZ-GL18NAH (PSIG) 550 500 (PSIG) 200 75 70 65 175 450 400 Indoor DB temperature (°F) 350 Suction pressure 75 70 65 150 125 100 Indoor DB temperature (°F) Condensing pressure 300 250 5 75 81Hz 50 15 25 35 45 55 65 75 (°F) 5 Outdoor ambient temperature 81Hz 15 25 35 45 55 65 75 (°F) Outdoor ambient temperature MUZ-GL24NA MUZ-GL24NAH (PSIG) 450 75 425 70 400 375 350 Indoor DB temperature (°F) 65 Condensing pressure 325 300 58Hz 275 250 5 15 25 35 45 55 65 75(°F) Outdoor ambient temperature Suction pressure (PSIG) 210 190 170 150 130 110 90 70 50 5 75 70 65 Indoor DB temperature (°F) 58Hz 15 25 35 45 55 65 75(°F) Outdoor ambient temperature OBH733F 33 7-4. STANDARD OPERATION DATA Model MSZ-GL09NA - U1 Total Item Capacity SHF Input Rated frequency Indoor unit Unit Btu/h -- kW Hz Cooling 9,000 0.82 0.585 59 Heating 10,900 -- 0.72 73 MSZ-GL09NA Power supply Input Fan motor current V, phase, Hz kW A 0.022 0.24/0.22 0.023 0.25/0.23 Outdoor unit MUZ-GL09NA - U1 MUZ-GL09NAH - U1 MSZ-GL09NA - U8 Cooling 9,000 0.82 0.585 48 Heating 10,900 -- 0.72 59 MSZ-GL09NA 208/230, 1, 60 0.022 0.24/0.22 0.023 0.25/0.23 MUZ-GL09NA - U8 MUZ-GL09NAH - U8 MSY-GL09NA Cooling 9,000 0.82 0.585 59.5 MSY-GL09NA 0.022 0.24/0.22 MUY-GL09NA Electrical circuit Refrigerant circuit Power supply V, phase, Hz Input kW Comp. current A Fan motor current A Condensing pressure PSIG Suction pressure PSIG Discharge temperature °F Condensing temperature °F Suction temperature °F Comp. shell bottom temperature °F Ref. pipe length ft. Refrigerant charge (R410A) Intake air temperature DB °F WB °F DB °F Discharge air temperature WB °F Fan speed (High) rpm Airflow (High) CFM Intake air temperature DB °F WB °F Fan speed rpm Airflow CFM 0.563 2.67/2.41 0.36/0.33 357 151 146 108 61 144 0.697 3.25/2.94 0.34/0.31 345 107 156 102 44 154 2 lb 5 oz. 80 70 67 60 59 99 56 -- 1,020 1,040 367 (Wet) 413 95 47 -- -- 900 860 1,229 1,172 208/230, 1, 60 0.563 0.697 2.45/2.21 3.05/2.76 0.36/0.33 0.34/0.31 358 349 149 108 148 155 108 104 63 44 140 144 25 2 lb 9 oz. 80 70 67 60 59 99 56 -- 1,020 1,040 367 (Wet) 413 95 47 -- -- 900 860 1,229 1,172 0.563 2.63/2.37 0.36/0.33 358 149 154 108 66 152 80 67 59 56 1,020 367 (Wet) 95 -- 900 1,229 Indoor unit Outdoor unit OBH733F 34 Total Electrical circuit Model Item Capacity SHF Input Rated frequency Indoor unit Power supply Input Fan motor current Unit Btu/h -- kW Hz V, phase, Hz kW A Outdoor unit Power supply V, phase, Hz Input kW Comp. current A Fan motor current A Condensing pressure PSIG Suction pressure PSIG Discharge temperature °F Condensing temperature °F Suction temperature °F Comp. shell bottom temperature °F Ref. pipe length ft. Refrigerant charge (R410A) Intake air temperature DB °F WB °F DB °F Discharge air temperature WB °F Fan speed (High) rpm Airflow (High) CFM Intake air temperature DB °F WB °F Fan speed rpm Airflow CFM MSZ-GL12NA MSY-GL12NA Cooling Heating 12,000 14,400 0.77 -- 0.920 1.10 70 77 MSZ-GL12NA MSY-GL12NA MSZ-GL15NA MSY-GL15NA Cooling Heating 14,000 18,000 0.78 -- 1.080 1.60 56.5 74 MSZ-GL15NA MSY-GL15NA 208/230, 1, 60 0.022 0.023 0.24/0.22 0.25/0.23 MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA 0.043 0.030 0.43/0.39 0.34/0.31 MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA 208/230, 1, 60 0.898 4.01/3.62 0.41/0.37 380 133 166 112 60 152 80 67 57 55 1,020 367 (Wet) 95 -- 900 1,229 1.077 1.037 4.86/4.39 4.51/4.08 0.40/0.36 0.41/0.37 402 396 106 138 167 168 115 115 35 61 150 152 25 2 lb 9 oz. 70 80 60 67 110 58 -- 56 1,040 1,280 413 498 (Wet) 47 95 43 -- 860 910 1,172 1,243 1.570 7.11/6.43 0.40/0.36 427 98 178 120 31 158 70 60 114 -- 1,140 463 47 43 900 1,229 Refrigerant circuit Indoor unit Outdoor unit OBH733F 35 Total Electrical circuit Model Item Capacity SHF Input Rated frequency Indoor unit Power supply Input Fan motor current Unit Btu/h -- kW Hz V, phase, Hz kW A Outdoor unit Power supply V, phase, Hz Input kW Comp. current A Fan motor current A Condensing pressure PSIG Suction pressure PSIG Discharge temperature °F Condensing temperature °F Suction temperature °F Comp. shell bottom temperature °F Ref. pipe length ft. Refrigerant charge (R410A) Intake air temperature DB °F WB °F DB °F Discharge air temperature WB °F Fan speed (High) rpm Airflow (High) CFM Intake air temperature DB °F WB °F Fan speed rpm Airflow CFM MSZ-GL18NA MSY-GL18NA Cooling Heating 18,000 21,600 0.87 -- 1.34 1.68 69 81 MSZ-GL18NA MSY-GL18NA MSZ-GL24NA MSY-GL24NA Cooling Heating 22,500 27,600 0.75 -- 1.80 2.34 67.5 82.0 MSZ-GL24NA MSY-GL24NA 208/230, 1, 60 0.045 0.46/0.42 MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA 0.058 0.56/0.51 MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA 208/230, 1, 60 1.295 1.635 1.742 2.282 5.01/4.53 6.67/6.03 7.01/6.34 9.59/8.67 1.05/0.95 1.05/0.95 1.16/1.05 1.13/1.02 377 391 395 405 144 103 141 102 149 178 158 171 111 111 115 115 51 43 52 33 134 160 140 148 25 3 lb 9 oz. 4 lb 3 oz. 80 70 80 70 67 60 67 60 52 111 56 111 51 -- 53 -- 1,170 1,170 1,300 1,300 581 (Wet) 646 634 (Wet) 738 95 47 95 47 -- 43 -- 43 810 810 840 810 1,691 1,691 1,769 1,701 Refrigerant circuit Indoor unit Outdoor unit OBH733F 36 7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY Capacity correction factors Capacity correction factors Input correction factors Input correction factors MUZ-GL09NA - U1 MUZ-GL09NAH- U1 Correction of Cooling capacity 2.0 Correction of Cooling total input 2.0 Correction of Heating capacity 2.0 Correction of Heating total input 2.0 1.5 1.5 1.5 1.5 1.0 1.0 1.0 1.0 0.5 0.5 0.5 0.5 0 25 50 75 100 (Hz) 0 25 50 75 100 (Hz) 0 50 100 150(Hz) 0 50 100 150 (Hz) The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor MUY-GL09NA Correction of Cooling capacity 2.0 Correction of Cooling total input 2.0 1.5 1.5 1.0 1.0 0.5 0.5 Input correction factors Capacity correction factors Input correction factors Capacity correction factors Input correction factors Capacity correction factors 0 25 50 75 100 (Hz) 0 25 50 75 100 (Hz) The operational frequency of compressor The operational frequency of compressor MUZ-GL09NA - U8 MUZ-GL09NAH - U8 Correction of Cooling capacity 2.0 Correction of Cooling total input 2.0 Correction of Heating capacity 2.0 Correction of Heating total input 2.0 1.5 1.5 1.5 1.5 1.0 1.0 1.0 1.0 0.5 0.5 0.5 0.5 Input correction factors Capacity correction factors Input correction factors Capacity correction factors 0 25 50 75 100 (Hz) 0 25 50 75 100 (Hz) 0 25 50 75 100 (Hz) 0 25 50 75 100(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 2.0 Correction of Cooling total input 2.0 Correction of Heating capacity 2.0 Correction of Heating total input 2.0 1.5 1.5 1.5 1.5 1.0 1.0 1.0 1.0 0.5 0.5 0.5 0.5 0 25 50 75 100 (Hz) 0 25 50 75 100 (Hz) 0 25 50 75 100 (Hz) 0 25 50 75 100(Hz) The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor OBH733F 37 Capacity correction factors Capacity correction factors Input correction factors Capacity correction factors Input correction factors MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA Correction of Cooling capacity 2.0 Correction of Cooling total input 2.0 Correction of Heating capacity 2.0 Correction of Heating total input 2.0 1.5 1.5 1.5 1.5 1.0 1.0 1.0 1.0 0.5 0.5 0.5 0.5 0 25 50 75 100 (Hz) 0 25 50 75 100 (Hz) 0 50 100 150 (Hz) 0 50 100 150(Hz) The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor Input correction factors Capacity correction factors Input correction factors MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA Correction of Cooling capacity 2.0 Correction of Cooling total input 2.0 2.0 Correction of Heating capacity Correction of Heating total input 2.0 1.5 1.5 1.5 1.5 1.0 1.0 1.0 1.0 0.5 0.5 0.5 0.5 Th0e 30 60 90 operational frequency 120 150 (Hz) of compressor 0 The 30 60 90 operational frequency 120 150 (Hz) 0 30 60 90 120 150 (Hz) of compressor The operational frequency of compressor 0 30 60 90 120 150(Hz) The operational frequency of compressor Input correction factors Capacity correction factors Input correction factors MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA Correction of Cooling capacity 1.5 Correction of Cooling total input 2.5 2.0 1.0 1.5 1.0 0.5 0.5 1.5 Correction of Heating capacity 1.0 0.5 Correction of Heating total input 2.0 1.5 1.0 0.5 0 50 100 150(Hz) 0 50 100 150(Hz) 0 50 100 150(Hz) The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor 0 50 100 150(Hz) The operational frequency of compressor Capacity correction factors 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 var- ies). 6. To cancel test run operation (EMERGENCY OPERATION), press EMERGENCY OPERATION switch or any button on the remote controller. OBH733F 38 8 ACTUATOR CONTROL MUZ-GL09NA MUZ-GL12NA MUZ-GL15NA MUZ-GL18NA MUZ-GL24NA MUZ-GL09NAH MUZ-GL12NAH MUZ-GL15NAH MUZ-GL18NAH MUZ-GL24NAH MUY-GL09NA MUY-GL12NA MUY-GL15NA 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. 5 seconds ON 15 seconds Compressor OFF ON Outdoor fan motor 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 Actuator Compressor LEV Outdoor fan motor R.V.coil Indoor fan motor Defrost heater * Discharge temperature thermistor Protection Indoor coil temperature thermistor Defrost thermistor (MUZ) Cooling: Coil frost prevention Heating: High pressure protection Heating: Defrosting Fin temperature thermistor Protection Ambient temperature thermistor Cooling: Low ambient temperature operation Heating: Defrosting (Heater) Outdoor heat exchanger temperature thermistor *. MUZ-GL·NAH only. Cooling: Low ambient temperature operation Cooling: High pressure protection OBH733F 39 9 SERVICE FUNCTIONS MUZ-GL09NA MUZ-GL12NA MUZ-GL15NA MUZ-GL18NA MUZ-GL24NA MUZ-GL09NAH MUZ-GL12NAH MUZ-GL15NAH MUZ-GL18NAH MUZ-GL24NAH MUY-GL09NA MUY-GL12NA MUY-GL15NA MUY-GL18NA MUY-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 10-6.1.). Defrost finish temperature Jumper MUZ-GL09/12/15NA MUZ-GL09/12/15NAH MUZ-GL18/24NA MUZ-GL18/24NAH Soldered (Initial setting) JS None (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. The pre-heat control prevents those troubles. 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 10-6.1) Jumper Soldered JK Cut Pre-heat control setting MUZ-GL09/12/15/18NA MUZ-GL09/12/15/18NAH MUZ-GL24NA MUZ-GL24NAH Deactivated (Factory setting) Deactivated Activated Activated (Factory setting) NOTE: When the inverter P.C. board is replaced, check the JK wire, and cut/solder them if necessary. OBH733F 40 10 TROUBLESHOOTING MUZ-GL09NA MUZ-GL12NA MUZ-GL15NA MUZ-GL18NA MUZ-GL24NA MUZ-GL09NAH MUZ-GL12NAH MUZ-GL15NAH MUZ-GL18NAH MUZ-GL24NAH MUY-GL09NA MUY-GL12NA MUY-GL15NA MUY-GL18NA MUY-GL24NA 10-1. 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 blinking on and off to indicate an abnormality. To make sure, check how many times the OPERATION INDICATOR lamp is blinking 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 10-3. OBH733F 41 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 MSZ-GL06/09/12/15NA MSZ-GL18NA MSY-GL09/12/15NA MSY-GL18NA MSZ-GL24NA MSY-GL24NA 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 figure are all displayed. Then release the buttons. Press STOP/OPERATE (OFF/ON) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. 1 1. 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 No (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 10-2.2) Judgment of indoor/outdoor abnormality Yes (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 Yes is abnormal. No The indoor unit is abnormal. Check the blinking pattern, and identify the abnormal point by referring to the indoor unit failure recall 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 recall mode table. (Refer to 10-2.3) Make sure to check at least 2 consecutive blinking cycles. 3 E.g.: MSZ type 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: Blinking at 0.5- Blinking at 0.5- 2.5-second OFF second interval 2.5-second OFF second interval ON OFF Beeps Repeated cycle Beeps Repeated cycle 3.Blinking pattern when the outdoor unit is abnormal: Blinking at 0.5- 2.5-second OFF 3-second ON second interval 2.5-second OFF ON OFF No beep Repeated cycle Beeps OBH733F 42 Beeps Repeated cycle 3-second ON Blinking at 0.5second interval No beep Repeated cycle Beeps Repeated cycle 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). 1 1. 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 No (OFF) Yes (Blinks) The outdoor unit is abnormal. Check the blinking pattern, and identify the abnormal point by referring to the outdoor unit failure recall mode table (10-2.3.). Make sure to check at least 2 consecutive blinking cycles. 2 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. The outdoor unit is normal. 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" (10-2.1.). 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: ON OFF 2.5-second OFF 3-second ON No beep Repeated cycle Blinking at 0.5second interval Beeps 2.5-second OFF 3-second ON Blinking at 0.5second interval No beep Repeated cycle Beeps Repeated cycle OBH733F 43 3. Table of outdoor unit failure mode recall function NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-3.). The upper lamp of the OPERATION INDICATOR lamp (Indoor unit) Abnormal point (Failure mode/protection) OFF 1-time blink 2.5 seconds OFF None (Normal) Indoor/outdoor communication, receiving error Indoor/outdoor communication, receiving error 2-time blink Outdoor power system 2.5 seconds OFF 3-time blink 2.5 seconds OFF Discharge temperature thermistor Defrost thermistor Fin temperature thermistor 4-time blink 2.5 seconds OFF P.C. board temperature thermistor Ambient temperature thermistor Outdoor heat exchanger temperature thermistor Overcurrent Compressor synchronous abnormality (Compressor start-up failure protection) 5-time blink Discharge temperature 2.5 seconds OFF 6-time blink High pressure 2.5 seconds OFF 7-time blink Fin temperature/ P.C. board 2.5 seconds temperature OFF 8-time blink Outdoor fan motor 2.5 seconds OFF 9-time blink 2.5 seconds OFF Non-volatile memory data Power module (IC700) (MUZ-GL09/12/15/18, MUYGL09/12/15/18) IGBT module (IC700) (MUZ-GL24, MUY-GL24) LED indication (Outdoor P.C. board) Condition Remedy Indoor/outdoor unit failure mode recall function Outdoor unit failure mode recall function -- -- -- -- -- Any signals from the inverter P.C. ·Refer to 10-5. How -- board cannot be received normally for to check miswiring and 3 minutes. Although the inverter P.C. board serial signal error. ·Refer to 10-5. How -- sends signal "0", signal "1" has been to check miswiring and received 30 consecutive times. serial signal error. Overcurrent protection cut-out · Reconnect operates 3 consecutive times within connectors. -- 1 minute after the compressor gets started. ·Refer to 10-5. "How to check inverter/ compressor". ·Check stop valve. 1-time blink every Thermistor shorts or opens during ·Refer to 10-5. 2.5 seconds compressor running. "Check of outdoor thermistors". Defective outdoor 3-time blink thermistors can be 2.5 seconds OFF 4-time blink 2.5 seconds OFF identified by checking the blinking pattern of LED. 2-time blink 2.5 seconds OFF -- 11-time blink Large current flows into the power · Reconnect 2.5 seconds OFF module (IC700) (MUZ-GL09/12/15/18, compressor connector. MUY-GL09/12/15/18)/ IGBT module ·Refer to 10-5. "How (IC700) (MUZ-GL24, MUY-GL24). to check inverter/ -- compressor". ·Check stop valve. 12-time blink Waveform of compressor current is ·Reconnect 2.5 seconds OFF distorted. compressor connector. ·Refer to 10-5. "How -- to check inverter/ compressor". Temperature of discharge temperature ·Check refrigerant thermistor exceeds 241°F (116°C), circuit and refrigerant compressor stops. amount. -- Compressor can restart if discharge ·Refer to 10-5. "Check -- temperature thermistor reads of LEV". 212°F (100°C) or less 3 minutes later. Temperature indoor coil thermistor ·Check refrigerant -- exceeds 158°F (70°C) in HEAT circuit and refrigerant mode. Temperature defrost thermistor amount. -- exceeds 158°F (70°C) in COOL mode. ·Check stop valve. 7-time blink Temperature of the fin temperature ·Check around outdoor 2.5 seconds OFF thermistor on the inverter P.C. board unit. exceeds 167 - 187°F (75 - 86°C) (MUZ- ·Check outdoor unit air GL09/12/15/18, MUY-GL09/12/15/18)/167 passage. - 176°F (75 - 80°C) (MUZ-GL24, MUY- ·Refer to 10-5. "Check GL24), or temperature of P.C. board of outdoor fan motor". -- temperature thermistor on the inverter P.C. board exceeds 162 - 185°F (72 - 85°C) (MUZ-GL09/12/15/18, MUY- GL09/12/15/18)/158 - 167°F (70 - 75°C) (MUZ-GL24, MUY-GL24). Outdoor fan has stopped 3 times in a ·Refer to 10-5. "Check row within 30 seconds after outdoor of outdoor fan motor". -- fan start-up. Refer to 10-5. "Check -- of inverter P.C. board". 5-time blink Non-volatile memory data cannot be ·Replace the inverter 2.5 seconds OFF read properly. P.C. board. 6-time blink The interface short circuit occurs ·Refer to 10-5. "How 2.5 seconds OFF in the output of the power module to check inverter/ (IC700) (MUZ-GL09/12/15/18, MUY- compressor". GL09/12/15/18)/IGBT module (IC700) (MUZ-GL24, MUY-GL24). The compressor winding shorts circuit. OBH733F 44 The upper lamp of the OPERATION INDICATOR lamp (Indoor unit) Abnormal point (Failure mode/protection) 10-time blink Discharge temperature 2.5 seconds OFF 11-time blink 2.5 seconds OFF 14-time blink or more 2.5 seconds OFF DC voltage Each phase current of compressor Stop valve (Closed valve) 4-way valve/ Pipe temperature Outdoor refrigerant system abnormality NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-3.). LED indication (Outdoor P.C. board) Condition Remedy Indoor/outdoor unit failure mode recall function Outdoor unit failure mode recall function Temperature of discharge temperature ·Refer to 10-5. "Check thermistor has been 122°F (50°C) or of LEV". -- less for 20 minutes. ·Check refrigerant -- circuit and refrigerant amount. 8-time blink DC voltage of inverter cannot be ·Refer to 10-5. "How 2.5 seconds OFF detected normally. 9-time blink Each phase current of compressor to check inverter/ compressor". -- 2.5 seconds OFF cannot be detected normally. 14-time blink Closed valve is detected by 2.5 seconds OFF compressor current. ·Check stop valve. 16-time blink The 4-way valve does not work 2.5 seconds OFF properly. ·Check the 4-way valve. The indoor coil thermistor detects an ·Replace the inverter abnormal temperature. P.C. board. 1-time blink A closed valve and air trapped in the ·Check for a gas leak 2.5 seconds OFF 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 10-5. "Check of outdoor refrigerant circuit". OBH733F 45 10-3. TROUBLESHOOTING CHECK TABLE No. Symptom Outdoor unit does not op- 1 erate. 2 LED indication 1-time blink every 2.5 seconds Abnormal point/ Condition Outdoor power system Outdoor thermistors Condition Overcurrent protection cut-out operates 3 consecutive times within 1 minute after the compressor gets started. Discharge temperature thermistor, fin temperature thermistor, defrost thermistor, P.C. board temperature thermistor, outdoor heat exchanger temperature thermistor or ambient temperature thermistor shorts or opens during compressor running. Remedy ·Reconnect connector of compressor. ·Refer to 10-5. "How to check inverter/compressor". ·Check stop valve. ·Refer to 10-5. "Check of outdoor thermistors". Outdoor control sys- Nonvolatile memory data cannot be read properly. ·Replace inverter P.C. board. 3 tem (The upper lamp of the OPERATION INDICATOR lamp on the indoor unit lights up or blinks 7-time.) 4 6-time blink Serial signal 2.5 seconds OFF The communication fails between the indoor and outdoor unit ·Refer to 10-5. "How to check for 3 minutes. miswiring and serial signal error. 5 11-time blink Stop valve/ 2.5 seconds OFF Closed valve Closed valve is detected by compressor current. ·Check stop valve. 16-time blink 4-way valve/ The 4-way valve does not work properly. ·Refer to 10-5. "Check of R.V. 6 2.5 seconds OFF Pipe temperature The indoor coil thermistor detects an abnormal temperature. coil". ·Replace the inverter P.C. board. 17-time blink Outdoor refrigerant A closed valve and air trapped in the refrigerant circuit are ·Check for a gas leak in a 2.5 seconds OFF system abnormality detected based on the temperature sensed by the indoor and connecting piping etc. 7 outdoor thermistors and the current of the compressor. ·Check the stop valve. ·Refer to 10-5. "Check of outdoor refrigerant circuit". 'Outdoor unit 2-time blink Overcurrent protec- Large current flows into the power module (IC700) (MUZ- stops and 2.5 seconds OFF tion GL09/12/15/18, MUY-GL09/12/15/18)/ IGBT module (IC700) 8 restarts 3 (MUZ-GL24, MUY-GL24). · Reconnect connector of compressor. ·Refer to 10-5. "How to check inverter/compressor". minutes later' is repeated. 3-time blink Discharge tem- 9 2.5 seconds OFF perature overheat protection ·Check stop valve. Temperature of discharge temperature thermistor exceeds ·Check refrigerant circuit and refrig241°F (116°C), compressor stops. Compressor can restart if erant amount. discharge temperature thermistor reads 212°F (100°C) or less ·Refer to 10-5. "Check of LEV". 3 minutes later. 4-time blink Fin temperature Temperature of the fin temperature thermistor on the heat sink ·Check around outdoor unit. 2.5 seconds OFF /P.C. board tem- exceeds 167 - 187°F (75 - 86°C) (MUZ-GL09/12/15/18, MUY- ·Check outdoor unit air passage. perature thermistor GL09/12/15/18)/167 - 176°F (75 - 80°C) (MUZ-GL24, MUY- ·Refer to 10-5. "Check of outdoor 10 overheat protection GL24) or temperature of P.C. board temperature thermistor on fan motor". the inverter P.C.board exceeds 162 - 185°F (72 - 85°C) (MUZ- GL09/12/15/18, MUY-GL09/12/15/18)/158 - 167°F (70 - 75°C) (MUZ-GL24, MUY-GL24). 5-time blink High pressure pro- Indoor coil thermistor exceeds 158°F (70°C) in HEAT mode. ·Check refrigerant circuit and refrig- 11 2.5 seconds OFF tection Defrost thermistor exceeds 158°F (70°C) in COOL mode. erant amount. ·Check stop valve. 8-time blink Compressor syn- The waveform of compressor current is distorted. · Reconnect connector of compressor. 12 2.5 seconds OFF chronous abnormal- ·Refer to 10-5. "How to check ity inverter/compressor". 10-time blink Outdoor fan motor Outdoor fan has stopped 3 times in a row within 30 seconds ·Refer to 10-5. "Check of outdoor 13 2.5 seconds OFF after outdoor fan start-up. fan motor. ·Refer to 10-5. "Check of inverter P.C. board. 14 12-time blink Each phase current Each phase current of compressor cannot be detected nor- 2.5 seconds OFF of compressor mally. ·Refer to 10-5. "How to check inverter/compressor". 13-time blink DC voltage DC voltage of inverter cannot be detected normally. ·It occurs with following case. 2.5 seconds OFF Instantaneous power voltage drop. (Short time power failure) (MUZ- 15 GL24, MUY-GL24) ·Refer to 10-5. "Check of power supply". (MUZ-GL24, MUY-GL24) ·Refer to 10-5. "How to check inverter/compressor". NOTE: 1. The location of LED is illustrated at the right figure. Refer to 10-6.1. 2. LED is lighted during normal operation. 3. Blinking patterns of this mode differ from the ones of the failure recall mode. Inverter P.C. board MUZ-GL09/12/15/18NA(H) MUY-GL09/12/15/18NA MUZ-GL24NA(H) MUY-GL24NA The blinking frequency shows the number of times the LED blinks after every 2.5-second OFF. (Example) When the blinking frequency is "2". 0.5-second ON 0.5-second ON Blinking LED Blinking LED ON OFF 2.5-second OFF 2.5-second OFF OBH733F 46 No. Symptom Outdoor unit operates. 16 17 18 19 LED indication 1-time blink 2.5 seconds OFF Abnormal point/ Condition Frequency drop by current protection MUZ-GL09/12/15/18 MUY-GL09/12/15/18 MUZ-GL24 MUY-GL24 Condition When the input current exceeds approximately 10.5A, compressor frequency lowers. Current from power outlet is nearing breaker capacity. Remedy The unit is normal, but check the following. ·Check if indoor filters are clogged. ·Check if refrigerant is short. ·Check if indoor/outdoor unit air circulation is short cycled. 3-time blink 2.5 seconds OFF 4-time blink 2.5 seconds OFF 5-time blink 2.5 seconds OFF Frequency drop by high pressure protection Frequency drop by defrosting in COOL mode Frequency drop by discharge temperature protection Outside temperature thermistor protection Temperature of indoor coil thermistor exceeds 131 °F (55°C) in HEAT mode, compressor frequency lowers. Indoor coil thermistor reads 46°F (8°C) or less in COOL mode, compressor frequency lowers. Temperature of discharge temperature thermistor exceeds 232°F (111°C), compressor frequency lowers. When the outside temperature thermistor shorts or opens, protective operation without that thermistors is performed. ·Check refrigerant circuit and refrigerant amount. ·Refer to 10-5. "Check of LEV". ·Refer to 10-5. "Check of outdoor thermistors". ·Refer to 10-5. Check of outdoor thermistors. Outdoor unit 20 operates. 21 22 7-time blink 2.5 seconds OFF 8-time blink 2.5 seconds OFF 9-time blink 2.5 seconds OFF Low discharge tem- Temperature of discharge temperature thermistor has been perature protection 122°F (50°C) or less for 20 minutes. MUZ-GL09/12/15/18 MUY-GL09/12/15/18 PAM protection PAM: Pulse Amplitude Modulation The overcurrent flows into PFC (Power factor correction :IC820) or the DC voltage reaches 394 V or more, PAM stops and restarts. MUZ-GL24 MUY-GL24 Zero cross signal cannot be detected. Zero cross detecting circuit Inverter check mode The connector of compressor is disconnected, inverter check mode starts. ·Refer to 10-5. "Check of LEV". ·Check refrigerant circuit and refrigerant amount. This is not malfunction. PAM protection will be activated in the following cases: 1 Instantaneous power voltage drop. (Short time power failure) 2 When the power supply voltage is high. ·It occurs with following cases. 1 Instantaneous power voltage drop. (Short time power failure) 2 Distortion of primary voltage ·Refer to 10-5. "Check of power supply". ·Check if the connector of the compressor is correctly connected. Refer to 10-5. "How to check inverter/compressor". NOTE: 1. The location of LED is illustrated at the right figure. Refer to 10-6.1. 2. LED is lighted during normal operation. 3. Blinking patterns of this mode differ from the ones of the failure recall mode. The blinking frequency shows the number of times the LED blinks after every 2.5-second OFF. (Example) When the blinking frequency is "2". Inverter P.C. board MUZ-GL09/12/15/18(H) MUY-GL09/12/15/18NA MUZ-GL24NA(H) MUY-GL24NA ON OFF 2.5-second OFF 0.5-second ON 2.5-second OFF 0.5-second ON Blinking LED Blinking LED OBH733F 47 10-4. TROUBLE CRITERION OF MAIN PARTS 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 MUZ-GL24NAH MUY-GL24NA Part name Defrost thermistor (RT61) (MUZ) Check method and criterion Fin temperature thermistor (RT64) Ambient temperature thermistor (RT65) Measure the resistance with a tester. Refer to 10-6. "Test point diagram and voltage", 1. "Inverter P.C. board", for the chart of thermistor. Outdoor heat exchanger temperature thermistor (RT68) Discharge temperature thermistor (RT62) Measure the resistance with a tester. Before measurement, hold the thermistor with your hands to warm it up. Refer to 10-6. "Test point diagram and voltage", 1. "Inverter P.C. board", for the chart of thermistor. Measure the resistance between terminals using a tester. [Temperature: 14 - 104°F (-10 - 40°C)] Compressor Normal () MUZ-GL09NA(H) - U1 MUY-GL09 MUZ-GL09NA(H) - U8 MUZ-GL12 MUY-GL12 MUZ-GL15/18 MUY-GL15/18 MUZ-GL24 MUY-GL24 U-V U-W V-W 1.26 - 1.72 1.60 - 2.17 0.82 - 1.11 0.87 - 1.18 Outdoor fan motor Measure the resistance between lead wires using a tester. [Temperature: 14 - 104°F (-10 - 40°C)] Color of lead wire RED BLK BLK WHT WHT RED Normal () MUZ-GL09/12/15 MUZ-GL18/24 MUY-GL09/12/15 MUY-GL18/24 29 - 40 12 - 16 R. V. coil (21S4) Measure the resistance using a tester. [Temperature: 14 - 104°F (-10 - 40°C)] Normal (k) 0.97 - 1.38 Expansion valve coil (LEV) Defrost heater (MUZ-GL·NAH) OBH733F Measure the resistance using a tester. [Temperature: 14 - 104°F (-10 - 40°C)] Color of lead wire Normal () RED ORN RED WHT RED BLU RED YLW 37 - 54 Measure the resistance using a tester. [Temperature: 14 - 104°F (-10 - 40°C)] Normal () 349 - 428 48 Figure WHT RED BLK W V U WHT RED BLK W V U WHT LEV ORN RED (+12V) YLW BLU 10-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector between the compressor and the power module (IC700) (MUZ-GL09/12/15/18, MUY-GL09/12/15/18)/IGBT module (IC700) (MUZGL24, MUY-GL24). Check the voltage between terminals. See 10-5. "Check of open phase". Are the voltages balanced? Yes Check the compressor. No Replace the inverter P.C. board. See 10-5. "Check of compressor". B Check of open phase With the connector between the compressor and the power module (IC700) (MUZ-GL09/12/15/18, MUY-GL09/12/15/18)/IGBT module (IC700) (MUZ-GL24, MUY-GL24) disconnected, activate the inverter and check if the inverter is normal by measuring the voltage balance between the terminals. Output voltage is 50 - 130 V. (The voltage may differ according to the tester.) << Operation method>> Start cooling or heating operation by pressing EMERGENCY OPERATION switch on the indoor unit. (TEST RUN OPERA- TION: Refer to 7-6.) <<Measurement point>> At 3 points BLK (U)-WHT (V) Measure AC voltage between the lead wires at 3 points. BLK (U)-RED (W) WHT(V)-RED (W) NOTE: 1. Output voltage varies according to power supply voltage. 2. Measure the voltage by analog type tester. 3. During this check, LED of the inverter P.C. board blinks 9 times. (Refer to 10-6.1.) C Check of compressor Refer to 10-5. "Check of compressor winding". Is the compressor normal? No Yes Refer to 10-5. "Check of compressor operation time". Does the compressor operate continuously? No Yes OK Replace the compressor. Refer to 10-5. "Check of compressor start failure". OBH733F 49 D Check of compressor winding Disconnect the connector between the compressor and the power module (IC700) (MUZ-GL09/12/15/18, MUY-GL09/12/15/18)/ IGBT module (IC700) (MUZ-GL24, MUY-GL24), and measure the resistance between the compressor terminals. <<Measurement point>> At 3 points BLK-WHT BLK-RED Measure the resistance between the lead wires at 3 points. WHT-RED <<Judgement>> Refer to 10-4. 0 [] ················Abnormal [short] Infinite [] ·······Abnormal [open] NOTE: Be sure to zero the ohmmeter before measurement. E Check of compressor operation time Connect the compressor and activate the inverter. Then measure the time until the inverter stops due to overcurrent. <<Operation method>> Start heating or cooling operation by pressing EMERGENCY OPERATION switch on the indoor unit. (TEST RUN OPERATION: Refer to 7-6.) <<Measurement>> Measure the time from the start of compressor to the stop of compressor due to overcurrent. <<Judgement>> 0 second 1 second 2 seconds 10 seconds F Check of compressor start failure 10 minutes Compressor starts Abnormal (IC700 failure) (Compressor winding short) Abnormal (Compressor lock out) (Starting defect) Abnormal (Poor contact) (Inverter P.C. board defect) (Disconnected connector) Abnormal (Refrigerant circuit defect) (Closed valve) Normal Confirm that ~ is normal. ·Electrical circuit check . Contact of the compressor connector . Output voltage of inverter P.C. board and balance of them (See 10-5. ) . Direct current voltage between DB61(+) and (-) (MUZ-GL09/12/15/18, MUY-GL09/12/15/18)/ JP715(+) and JP30(-) (MUZ-GL24, MUY-GL24), on the inverter P.C. board . Voltage between outdoor terminal block S1-S2 Does the compressor run for 10 seconds or Check the refrigerant circuit. more after it starts? Yes Check the stop valve. No After the compressor is heated with a drier, does the compressor start? 1 No Yes Compressor start failure. Activate pre-heat control. (Refer to 9-2. "PRE-HEAT CONTROL SETTING") Replace the compressor. OBH733F 50 1 Heat the compressor with a drier for about 20 minutes. Do not recover refrigerant gas while heating. Heating part G Check of outdoor thermistors Disconnect the connector of thermistor in the inverter P.C. board (see below table), and measure the resistance of thermistor. Is the resistance of thermistor normal? (Refer to 10-6.1.) Yes Replace the thermistor except RT64. When RT64 is abnormal, replace the inverter P.C. No board. Reconnect the connector of thermistor. Turn ON the power supply and press EMERGENCY OPERATION switch. Does the unit operate for 10 minutes or more without showing thermistor abnormality? No Yes Replace the inverter P.C. board. OK (Cause is poor contact.) MUZ-GL09/12/15/18, MUY-GL09/12/15/18 Thermistor Symbol Connector, Pin No. Defrost (MUZ) RT61 Between CN641 pin1 and pin2 Discharge temperature RT62 Between CN641 pin3 and pin4 Fin temperature RT64 Between CN642 pin1 and pin2 Ambient temperature RT65 Between CN643 pin1 and pin2 Outdoor heat exchanger temperature RT68 Between CN644 pin1 and pin3 MUZ-GL24, MUY-GL24 Thermistor Defrost (MUZ) Symbol Connector, Pin No. RT61 Between CN671 pin1 and pin2 Discharge temperature RT62 Between CN671 pin3 and pin4 Fin temperature RT64 Between CN673 pin1 and pin2 Ambient temperature RT65 Between CN672 pin1 and pin2 Outdoor heat exchanger temperature RT68 Between CN671 pin5 and pin6 Board Inverter P.C. board Board Inverter P.C. board OBH733F 51 H Check of R.V. coil (MUZ) MUZ-GL09/12/15/18NA MUZ-GL09/12/15/18NAH First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 10-4. In case CN721 is disconnected or R.V. coil is open, voltage is generated between the terminal pins of the connector although no signal is being transmitted to R.V. coil. Check if CN721 is connected. Unit operates in COOL mode even if it is set to HEAT mode. Disconnect connector between the compressor and the power module (IC700). Turn ON the power supply and press EMERGENCY OPERATION switch twice (HEAT mode). Is there 208/230 V AC between CN721 and on the inverter P.C. board 3 minutes after the power supply is turned No ON? Yes Replace the inverter P.C. board. Replace the 4-way valve. Unit operates in HEAT mode even if it is set to COOL mode. Disconnect connector between the compressor and the power module (IC700). Turn ON the power supply and press EMERGENCY OPERATION switch once (COOL mode). Is there 208/230 V AC between CN721 and on the inverter P.C. board Replace the inverter 3 minutes after the power supply is turned Yes P.C. board. ON? No Replace the 4-way valve. MUZ-GL24NA MUZ-GL24NAH First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 10-4. In case CN602 is disconnected or R.V. coil is open, voltage is generated between the terminal pins of the connector although no signal is being transmitted to R.V. coil. Check if CN602 is connected. Unit operates in COOL mode even if it is set to HEAT mode. Disconnect connector between the compressor and the IGBT module (IC700). Turn ON the power supply and press EMERGENCY OPERATION switch twice (HEAT mode). Is there 208/230 V AC between CN602 and on the inverter P.C. board 3 minutes after the power supply is turned No ON? Yes Replace the inverter P.C. board. Replace the 4-way valve. Unit operates in HEAT mode even if it is set to COOL mode. Disconnect connector between the compressor and the IGBT module (IC700). Turn ON the power supply and press EMERGENCY OPERATION switch once (COOL mode). Is there 208/230 V AC between CN602 and on the inverter P.C. board Replace the inverter 3 minutes after the power supply is turned Yes P.C. board. ON? No Replace the 4-way valve. OBH733F 52 I Check of outdoor fan motor Check the connection between the connector CN931 and CN932. Disconnect the connectors CN931 and CN932 from the inverter P.C. board. Is the resistance between each ter- minal of outdoor fan motor normal? (Refer to 10-4.) Yes No Disconnect CN932 from the inverter P.C. board, and turn on the power supply. Rotate the outdoor fan motor manually and measure the voltage of CN931. Between 1(+) and 5(-) Between 2(+) and 5(-) Between 3(+) and 5(-) (Fixed to either 5 or 0 V DC) No No Replace the outdoor fan motor. Does the voltage between each terminal become 5 and 0 V DC repeatedly? Yes Does the outdoor fan motor rotate smoothly? Yes Replace the inverter P.C. board. OBH733F 53 J Check of power supply Disconnect the connector between the compressor and the power module (IC700) (MUZ-GL09/12/15/18, MUYGL09/12/15/18)/IGBT module (IC700) (MUZ-GL24, MUY-GL24). Turn ON power supply and press EMERGENCY OPERATION switch. Does the upper lamp of the OPERATION INDICATOR lamp on the indoor unit light up? No Yes Rectify indoor/outdoor connecting wire. No Is there voltage 208/230 V AC between the indoor terminal block S1 and S2? Replace the indoor Yes electronic control P.C. board. Is there DC voltage 260 - 370 V DC between DB61 (+) and DB61 () (MUZ-GL09/12/15/18, MUY- GL09/12/15/18)/294 - 370 V DC between JP715 (+) and JP30 () Yes (MUZ-GL24, MUY-GL24) on the inverter P.C. board? (Refer to 10-6.1.) No Check the electric parts in main circuit. Does LED on the inverter P.C. board light up or blink? (Refer to 10-6.1.) No Replace the inverter P.C. board. Yes If lights up, OK. If blinks, refer to 10-3. DB61 260 - 370 V DC Inverter P.C. board (Solder side) MUZ-GL09/12/15/18NA MUZ-GL09/12/15/18NAH MUY-GL09/12/15/18NA 294 -370 V DC JP715 JP30 MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA OBH733F 54 K Check of LEV (Expansion valve) Turn ON the power supply. <Preparation of the remote controller> While pressing both 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 figure are all displayed. Then release the buttons. MSZ-GL06/09/12/15NA MSZ-GL18NA MSY-GL09/12/15NA 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. 1 Expansion valve operates in full-opening direction. E.g.: MSZ type Do you hear the expansion valve "click, click·······"? Do you feel the expansion valve vibrates Yes OK when touching it ? No 1. Regardless of normal or abnormal condition, a short beep is emitted once the signal is received. Is LEV coil properly fixed to the expansion valve? No Yes Does the resistance of LEV coil have the characteristics? (Refer to 10-4.) Yes No Replace the LEV coil. Properly fix the LEV coil to the expansion valve. Measure each voltage between connector pins of CN724 on the inverter P.C. board. 1. Pin (-) -- Pin (+) 2. Pin (-) -- Pin (+) 3. Pin (-) -- Pin (+) 4. Pin (-) -- Pin (+) Is there about 3 - 5 V AC between each? NOTE: Measure the voltage by an analog tester. Yes Replace the inverter P.C. No board. Replace the expansion valve. NOTE: After check of LEV, do the undermentioned operations. 1. Turn OFF the power supply and turn it ON again. 2. Press RESET button on the remote controller. OBH733F 55 L Check of inverter P.C. board Check the outdoor fan motor. (Refer to 10-5. .) Is the fuse (F901) blown on the in- verter P.C. board? Yes No Check the connection of the connectors (CN931, CN932) of the outdoor fan motor. If the connection is poor, make it correct. Operate the outdoor unit by starting EMERGENCY OPERATION. Check the LED indication on the in- verter P.C. board. Does the LED blink 10 times? No Yes (10-time blink) Check the corresponding parts following LED indication. (Refer to 10-3.) Replace the inverter P.C. board. OBH733F 56 M How to check miswiring and serial signal error MUZ-GL09/12/15NA MUZ-GL09/12/15NAH MUY-GL09/12/15NA Turn OFF the power supply. Is there rated voltage in the power supply? No Yes Turn ON the power supply. Check the power supply. Is there rated voltage between the outdoor terminal block S1 and S2? Yes No Press EMERGENCY OPERATION switch once. Check the wiring. Does the left lamp of OPERATION INDICATOR lamp light up? <Confirmation of the power to the indoor unit> No Yes Is serial signal error indicated 6 minutes later? No Yes Is there any miswiring, poor contact, or wire disconnection of the indoor/outdoor connect- Yes Correct them. ing wire? No A Turn OFF the power supply. Check once more if the indoor/outdoor B connecting wire is not miswiring. Bridge the outdoor terminal block S2 and S3. 1 Turn ON the power supply. 1. Miswiring may damage indoor electronic control P.C. board during the operation. Be sure to confirm the wiring is correct before the operation starts. 3. Be sure to check this within 3 minutes after turning ON. After 3 minutes, LED blinks 6 times. Even when the inverter P.C. board is normal, LED blinks 6 times after 3 minutes. Is the bus-bar voltage of the inverter P.C. board normal? (Refer to "TEST POINT DIAGRAM AND VOLTAGE" in the outdoor service manual.) Yes No Check of power supply. Does the LED on the inverter P.C. board repeat "3.6-second-OFF and 0.8-second-ON quick blinking"? 3 Yes Turn OFF the power supply. Remove the bridge between the outdoor terminal block S2 and S3. Turn ON the power supply. No (Lighted or not lighted) Replace the inverter P.C. board . 2 2. Be careful of the residual voltage of smoothing capacitor. Is there rated voltage between the indoor terminal block S1 and S2? <Confirmation of power voltage> Yes Check the wiring If there are any error of the indoor/outdoor connecting wire: No such as the damage of the wire, intermediate connection, and/or poor contact to the terminal block, replace the indoor/ outdoor connecting wire. Is there amplitude of 10 to 20 V DC between the indoor terminal block S2 and S3? <Confirmation of serial signal> No A · Turn OFF inverter-controlled lighting equipment. · Turn OFF the power supply and then turn ON again. · Press EMERGENCY OPERATION switch. Is serial signal error indicated 6 minutes later? Yes B · Reinstall either the unit or the light away from each other. No · Attach a filter on remote control receiv- ing section of the indoor unit. Yes Is there 2 V DC or less between CN202 (+) and JPG (GND)(-) on the indoor electronic control P.C. board? Yes No Is there 2 V DC or less between CN202A (+) and JPG (GND)(-) on the indoor electronic control P.C. board? No Yes Is there 2 V DC or less between CN202 (+) and JPG (GND)(-) on the indoor electronic control P.C. Yes board? No Replace the indoor power P.C. board. Replace the indoor electronic control P.C. board. OBH733F 57 MUZ-GL18/24NA MUZ-GL18/24NAH MUY-GL18/24NA Turn OFF the power supply. Is there rated voltage in the power supply? No Yes Turn ON the power supply. Check the power supply. Is there rated voltage between outdoor terminal block S1 and S2? No Yes Press EMERGENCY OPERATION switch once. Check the wiring. Does the OPERATION INDICATOR lamp light up? <Confirmation of the power to the indoor unit> Yes Is serial signal error indicated 6 minutes later? Yes No Is there any miswiring, poor contact, or wire No disconnection of the indoor/outdoor connect- Yes Correct them. ing wire? No A Turn OFF the power supply. Check once more if the indoor/outdoor B connecting wire is not miswiring. Bridge the outdoor terminal block S2 and S3. 1 Turn ON the power supply. 1. Miswiring may damage indoor electronic control P.C. board during the operation. Be sure to confirm the wiring is correct before the operation starts. 3. Be sure to check this within 3 minutes after turning ON. After 3 minutes, LED blinks 6 times. Even when the inverter P.C. board or the outdoor electronic control P.C. board is normal, LED blinks 6 times after 3 minutes. (Except for outdoor unit of multi system type) Is the bus-bar voltage of the inverter P.C. board or the outdoor electronic control P.C. board normal? (Refer to "TEST POINT DIAGRAM AND VOLTAGE" in the outdoor service manual.) No Yes Does the LED on the inverter P.C. board or the outdoor electronic control P.C. board repeat "3.6-second-OFF and 0.8-second-ON quick blinking"? 3 Yes No (Lighted or not lighted) Replace the inverter P.C. board or the outdoor electronic control P.C. board. 2 2. Be careful of the residual voltage of smoothing capacitor. Turn OFF the power supply. Remove the bridge between outdoor terminal block S2 and S3. GL18 GL24 Turn on the power supply. Replace the indoor electronic control P.C. board. Is there amplitude of 10 to 20 V DC between the indoor terminal block S2 and S3? <Confirmation of serial signal> No Yes A · Turn OFF inverter-controlled lighting equipment. · Turn OFF the power supply and then turn ON again. · Press EMERGENCY OPERATION switch. Is serial signal error indicated 6 minutes later? Yes B · Reinstall either the unit or the light away from each other. No · Attach a filter on remote control receiv- ing section of the indoor unit. Is there 2 V DC or less between CN10A (+) and GND (-) on the indoor electronic control P.C. board? Yes No Is there 2 V DC or less between CN10A (+) and GND (-) on the indoor electronic control P.C. board? No Yes Is there 2 V DC or less between CN10A (+) and GND (-) on the indoor electronic control P.C. Yes board? No Replace the indoor power P.C. board. Replace the indoor electronic control P.C. board. OBH733F 58 N Check of defrost heater (base pan heater) (MUZ-GL·NAH) MUZ-GL09/12/15/18/24NAH Check the following points before checking electric continuity. 1. Does the resistance of ambient temperature thermistor have the characteristics? Refer to 10-6.1. 2. Is the resistance of defrost heater normal? Refer to 10-4. 3. Does the heater protector remain conducted (not open)? 4. Are both ambient temperature thermistor and circuit of defrost heater securely connected to connectors? In HEAT mode, for more than 5 minutes, let the ambient temperature thermistor continue to read 32°F (0°C) or below, and let the defrost thermistor continue to read 30°F (-1°C) or below. NOTE: In case both thermistors are more than the above temperature, cool them with cold water etc... Is there 208/230 V AC between CN601 and (MUZ-GL24NAH)/CN722 and (Other models) on the inverter P.C. board? Refer to 10-6.1. Yes No Not the problem of the inverter P.C. board. Replace the inverter P.C. board. O Check of outdoor refrigerant circuit Has the operation stopped during pump down? Yes No Was the operation started with the stop valve closed, and was it opened during operation? The unit occasionally stops when the stop valve is opened or closed during Yes operation. Open the stop valve and start the cooling operation again. No The operation has stopped to prevent the diesel explosion caused by air trapped in the refrigerant circuit. Close the stop valve, and disconnect the power plug or turn OFF the breaker. The refrigerant gas amount may be 60% or less than the normal amount. Identify where the gas is leaking from, and fix the leak. CAUTION : Do not start the operation again to prevent hazards. OBH733F 59 P Electromagnetic noise enters into TV sets or radios Is the unit grounded? Ground the unit. No Yes Is the distance between the antennas and the indoor unit within 9.91 ft. (3m), or is the distance between the antennas Yes and the outdoor unit within 9.91 ft. (3m)? No Extend the distance between the antennas and the indoor unit, and/or the antennas and the outdoor unit. Is the distance between the TV sets or ra- dios and the indoor unit within 3.28 ft. (1m), or is the distance between the TV sets or radios and the outdoor unit within Yes 9.91 ft. (3m)? No Extend the distance between the TV sets and/or radios and the indoor unit, or the TV sets or radios and the outdoor unit. Are the antennas damaged? Is the coaxial cable damaged? Is there any poor contact in the anten- Yes na wiring? No Replace or repair the antenna. Replace or repair the coaxial cable. Is the indoor/outdoor connecting wire of the air conditioner and the wiring of the antennas close? Yes No Extend the distance between the indoor/outdoor connecting wire of the air conditioner and the wiring of the antennas. Even if all of the above conditions are fulfilled, the electromagnetic noise may enter, depending on the electric field strength or the installation condition (combination of specific conditions such as antennas or wiring). Check the following before asking for service. 1. Devices affected by the electromagnetic noise TV sets, radios (FM/AM broadcast, shortwave) 2. Channel, frequency, broadcast station affected by the electromagnetic noise 3. Channel, frequency, broadcast station unaffected by the electromagnetic noise 4. Layout of: indoor/outdoor unit of the air conditioner, indoor/outdoor wiring, ground wire, antennas, wiring from antennas, receiver 5. Electric field intensity of the broadcast station affected by the electromagnetic noise 6. Presence or absence of amplifier such as booster 7. Operation condition of air conditioner when the electromagnetic noise enters in 1) Turn OFF the power supply once, and then turn ON the power supply. In this situation, check for the electromagnetic noise. 2) Within 3 minutes after turning ON the power supply, press STOP/OPERATE (OFF/ON) button on the remote controller for power ON, and check for the electromagnetic noise. 3) After a short time (3 minutes later after turning ON), the outdoor unit starts running. During operation, check for the electromagnetic noise. 4) Press STOP/OPERATE (OFF/ON) button on the remote controller for power OFF, when the outdoor unit stops but the indoor/outdoor communication still runs on. In this situation, check for the electromagnetic noise. OBH733F 60 10-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUZ-GL09/12/15NA MUZ-GL09/12/15NAH MUY-GL09/12/15NA Back side of unit Smoothing capacitor (C63) DB61 260 - 370 V DC (-) (+) Smoothing capacitor (C62) R.V.coil/21S4 (CN721) Heater connector Smoothing capacitor (C61) (MUZ) 208/230 V AC (CN722) (MUZ-GL09/ 12/15NAH) 208/230 V AC Fuse (F801) T3.15AL250V Fuse (F701) T3.15AL250V Fuse (F901) T3.15AL250V Output to drive outdoor fan motor (CN932) Output to drive compressor (LDU, LDV, LDW) Fin temperature thermistor/RT64 (CN642) Signal of outdoor fan motor (CN931) Ambient temperature thermistor/RT65 (CN643) Defrost thermistor /RT61(CN641)(MUZ) Discharge temperature thermistor/RT62 (CN641) Outdoor heat exchanger temperature thermistor /RT68 (CN644) Expansion valve/LEV (CN724) LED Front side of unit 208/230 V AC Jumper wire for preheat control setting (JK) Jumper wire for changing defrost setting (JS) 5HVLVWDQFHN Defrost thermistor (RT61) Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68) 100 90 80 Discharge temperature thermistor (RT62) 70 800 700 60 600 50 500 40 400 30 300 20 200 10 100 0 -4 14 32 50 68 86 104 Temperature (°F) 0 32 50 68 86 104 122 140 158 176 194 212 230 248 Temperature (°F) OBH733F 61 5HVLVWDQFHN 5HVLVWDQFHN Fin temperature thermistor (RT64) 200 180 160 140 120 100 80 60 40 20 0 32 50 68 86 104 122 140 158 176 Temperature (°F) MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA Back side of unit 208/230 V AC DB61 260 - 370 V DC (-) (+) Smoothing capacitor (C63) Smoothing capacitor (C62) Smoothing capacitor (C61) Fuse (F801) T3.15AL250V R.V.coil/21S4 (CN721) (MUZ) 208/230 V AC Heater connector (CN722) (MUZ-GL18NAH) Fuse (F701) T3.15AL250V Fuse (F901) T3.15AL250V Output to drive outdoor fan motor (CN932) Output to drive compressor (LDU, LDV, LDW) 208/230 V AC LED Front side of unit Jumper wire for changing defrost setting (JS) Jumper wire for pre-heat control setting (JK) Fin temperature thermistor/RT64 (CN642) Signal of outdoor fan motor (CN931) Ambient temperature thermistor/RT65 (CN643) Defrost thermistor /RT61(CN641) (MUZ) Discharge temperature thermistor/RT62 (CN641) Outdoor heat exchanger temperature thermistor /RT68 (CN644) Expansion valve/LEV (CN724) 5HVLVWDQFHN 5HVLVWDQFHN 5HVLVWDQFHN Defrost thermistor (RT61) Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68) 100 90 80 Discharge temperature thermistor (RT62) 70 800 700 60 600 50 500 40 400 30 300 20 200 10 100 0 -4 14 32 50 68 86 104 Temperature (°F) 0 32 50 68 86 104 122 140 158 176 194 212 230 248 Temperature (°F) Fin temperature thermistor (RT64) 200 180 160 140 120 100 80 60 40 20 0 32 50 68 86 104 122 140 158 176 Temperature (°F) OBH733F 62 MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA Heater connector (CN601) (MUZ-GL24NAH) Fuse (F601) T3.15AL250V R.V. coil/21S4 (CN602) 208/230 V AC (MUZ) Signal of outdoor fan motor (CN931) Fuse (F901) T3.15AL250V Output to drive outdoor fan motor (CN932) Fuse (F880) T3.15AL250V JP715 (+) 294 - 370 V DC JP30 (-) Expansion valve/LEV (CN724) LED Defrost thermistor /RT61 (CN671) (MUZ) Discharge temperature thermistor/RT62 (CN671) Outdoor heat exchanger temperature thermistor /RT68 (CN671) Ambient temperature thermistor/RT65 (CN672) Fin temperature thermistor/RT64 (CN673) Jumper wire for changing defrost setting (JS) Jumper wire for pre-heat control setting (JK) Resistance(k ) 5HVLVWDQFHN Resistance(k ) Defrost thermistor (RT61) (MUZ) Ambient temperature thermistor (RT65) 100 Outdoor heat exchanger temperature thermistor (RT68) 90 80 Discharge temperature thermistor (RT62) 70 800 700 60 600 50 500 40 400 30 300 20 200 10 100 0-4 14 32 50 68 86 104 Temperature (°F) 0 32 50 68 86 104 122 140 158 176 194 212 230 248 Temperature (°F) OBH733F 63 200 Fin temperature thermistor (RT64) 180 160 140 120 100 80 60 40 20 032 50 68 86 104 122 140 158 176 Temperature (°F) 11 DISASSEMBLY INSTRUCTIONS <Detaching method of the terminals with locking mechanism> The terminal which has the locking mechanism can be detached as shown below. There are 2 types of the terminals with locking mechanism. The terminal without locking mechanism can be detached by pulling it out. Check the shape of the terminal before detaching. (1) Slide the sleeve and check if there is a locking lever or not. Sleeve (2) The terminal with this connector shown below has the locking mechanism. Locking lever Slide the sleeve. Pull the terminal while pushing the locking lever. 11-1. MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE 1. Removing the cabinet (1) Remove the screw fixing the service panel. (2) Pull down the service panel and remove it. (3) Remove the screws fixing the conduit cover. (4) Remove the conduit cover. (Photo 4) (5) Remove the screw fixing the conduit plate. (Photo 5) (6) Remove the conduit plate. (7) Disconnect the power supply wire and indoor/outdoor connecting wire. (8) Remove the screws fixing the top panel. (9) Remove the top panel. (10) Remove the screws fixing the cabinet. (11) Remove the cabinet. (12) Remove the screws fixing the back panel. (13) Remove the back panel. Photo 1 Hold the sleeve, and pull out the terminal slowly. Connector : Indicates the visible parts in the photos/figures. : Indicates the invisible parts in the photos/figures. PHOTOS/FIGURES Screws of the top panel Back panel Screws of the back panel Photo 2 Screws of the top panel Screws of the cabinet Photo 3 Screw of the cabinet Service panel Screws of the terminal block support and the back panel Screws of the cabinet OBH733F Screws of the cabinet 64 Direction to remove Hooks Photo 4 OPERATING PROCEDURE Screws of the conduit cover Photo 5 PHOTOS/FIGURES Screw of the conduit plate 2. Removing the inverter assembly, inverter P.C. board (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C. board> CN721 (R.V. coil) (MUZ) CN722 (Defrost heater and heater protector) (MUZGL09/12/15NAH) CN931, CN932 (Fan motor) CN641 (Defrost thermistor (MUZ) and discharge temperature thermistor) CN643 (Ambient temperature thermistor) CN644 (Outdoor heat exchanger temperature thermistor) CN724 (LEV) (3) Remove the compressor connector (CN61). (4) Remove the screws fixing the heat sink support and the separator. (5) Remove the fixing screws of the terminal block support and the back panel. (6) Remove the inverter assembly. (7) Remove the screw of the ground wire and screw of the terminal block support. (8) Remove the heat sink support from the P.C. board support. (9) Remove the screw of the inverter P.C. board and remove the inverter P.C. board from the P.C. board support. 3. Removing R.V. coil (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the following connectors: <Inverter P.C. board> CN721 (R.V. coil) (MUZ) (3) Remove the R.V. coil. Photo 6 Screws of the heat sink support and the separator Screws of the terminal block support and the back panel Photo 7 Heat sink Heat sink support P.C. board support Screw of the Terminal block support Terminal block support OBH733F Screw of the inverter P.C. board Screw of the ground wire 65 OPERATING PROCEDURE 4. Removing the discharge temperature thermistor, defrost thermistor, outdoor heat exchanger temperature thermistor and ambient temperature thermistor (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C. board> CN641 (Defrost thermistor (MUZ) and discharge temperature thermistor) CN643 (Ambient temperature thermistor) CN644 (Outdoor heat exchanger temperature thermistor) (3) Pull out the discharge temperature thermistor from its holder. (4) Pull out the defrost thermistor from its holder. (5) Pull out the outdoor heat exchanger temperature thermistor from its holder. (6) Pull out the ambient temperature thermistor from its holder. Photo 8 PHOTOS/FIGURES Screw of the R.V. coil (MUZ) Discharge temperature thermistor Photo 9 Ambient temperature thermistor Outdoor heat exchanger temperature thermistor Defrost thermistor (MUZ) OBH733F 66 OPERATING PROCEDURE 5. Removing outdoor fan motor (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the following connectors: <Inverter P.C. board> CN931, CN932 (Fan motor) (3) Remove the propeller fan nut. (4) Remove the propeller fan. (5) Remove the screws fixing the fan motor. (6) Remove the fan motor. NOTE: The propeller fan nut is a reverse thread. Photo 10 PHOTOS/FIGURES Screws of the outdoor fan motor Propeller fan 6. Removing the compressor and 4-way valve (1) Remove the cabinet and panels. (Refer to section 1.) (2) Remove the inverter assembly. (Refer to section 2.) (3) Remove the screws fixing the reactor. (4) Remove the reactor. (5) Remove the soundproof felt. (6) Recover gas from the refrigerant circuit. NOTE: Recover gas from the pipes until the pressure gauge shows 0 PSIG. (7) Detach the brazed part of the suction and the discharge pipe connected with compressor. (8) Remove the nuts fixing the compressor. (9) Remove the compressor. (10) Detach the brazed part of pipes connected with 4-way valve. Photo 11 Screws of the reactor Propeller fan nut Photo 12 Discharge pipe brazed part OBH733F Soundproof felt Suction pipe brazed part Brazed parts of 4-way valve 67 11-2. MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the cabinet (1) Remove the screws of the service panel. (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover. (4) Remove the service panel. (5) Remove the screws fixing the conduit cover. (6) Remove the conduit cover. (7) Remove the screw of fixing the conduit plate. (8) Remove the conduit plate. (9) Remove the top panel. (10) Remove the valve cover. (11) Disconnect the power supply and indoor/outdoor connecting wire. (12) Remove the screws of the cabinet. (13) Remove the cabinet. (14) Remove the screws of the back panel. (15) Remove the back panel. Photo 1 Screws of the top panel Screws of the cabinet Photo 3 Screws of the conduit cover Screws of the cabinet Screws of the cabinet Photo 4 Screw of the conduit plate Photo 2 Screw of the back panel Screws of the cabinet Screws of the top panel Screw of the valve cover OBH733F Screws of the cabinet Screws of the back panel Screws of the service panel 68 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the inverter assembly, inverter P.C. board (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C. board> CN721 (R.V. coil) (MUZ) CN722 (Defrost heater) (MUZ-GL18NAH) CN931, CN932 (Fan motor) CN641 (Defrost thermistor (MUZ) and discharge temperature thermistor) CN643 (Ambient temperature thermistor) CN644 (Outdoor heat exchanger temperature thermistor) CN724 (LEV) (3) Remove the compressor connector. (4) Remove the screw fixing the heat sink support and the separator. (5) Remove the fixing screws of the terminal block support and the back panel. (6) Remove the inverter assembly. (7) Remove the screw of the ground wire, screw of the P.C. board cover and screws of the terminal block support. (8) Remove the heat sink support from the P.C. board support. (9) Remove the screw of the inverter P.C. board and the inverter P.C. board from the P.C. board support. Photo 5 Screw of the heat sink support and the separator Screws of the terminal block support and the back panel Photo 6 Heat sink Heat sink support 3. Removing R.V. coil (MUZ) (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the following connector: <Inverter P.C. board> CN721 (R.V. coil) (MUZ) (3) Remove the R.V. coil. P.C. board support Screw of the P.C. board cover Photo 7 Screw of the inverter P.C. board Screw of the R.V. coil (MUZ) Screw of the ground wire Screws of the terminal block support Brazed parts of 4-way valve OBH733F 69 OPERATING PROCEDURE 4. Removing the discharge temperature thermistor, defrost thermistor (MUZ), outdoor heat exchanger temperature thermistor and ambient temperature thermistor (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C. board> CN641 (Defrost thermistor (MUZ) and discharge temperature thermistor) CN643 (Ambient temperature thermistor) CN644 (Outdoor heat exchanger temperature thermistor) (3) Pull out the discharge temperature thermistor from its holder. (4) Pull out the defrost thermistor from its holder. (5) Pull out the outdoor heat exchanger temperature thermistor from its holder. (6) Pull out the ambient temperature thermistor from its holder. Photo 8 PHOTOS/FIGURES Outdoor heat exchanger temperature thermistor Ambient temperature thermistor 5. Removing outdoor fan motor (1) Remove the top panel, cabinet and service panel. (Refer to section 1.) (2) Disconnect the following connectors: <Inverter P.C. board> CN931 and CN932 (Fan motor) (3) Remove the propeller fan nut. (4) Remove the propeller fan. (5) Remove the screws fixing the fan motor. (6) Remove the fan motor. NOTE: The propeller fan nut is a reverse thread. Photo 9 Defrost thermistor (MUZ) Propeller fan nut 6. Removing the compressor and 4-way valve (1) Remove the top panel, cabinet and service panel. (Refer to section 1.) (2) Remove the back panel. (Refer to section 1.) (3) Remove the inverter assembly. (Refer to section 2.) (4) Recover gas from the refrigerant circuit. NOTE: Recover gas from the pipes until the pressure gauge shows 0 PSIG. (5) Detach the brazed part of the suction and the discharge pipe connected with compressor. (6) Remove the compressor nuts. (7) Remove the compressor. (8) Detach the brazed part of 4-way valve and pipe. (Photo 7) OBH733F 70 Photo 10 Screws of the outdoor fan motor Brazed part of the discharge pipe Discharge temperature thermistor Brazed part of the suction pipe 11-3. MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the cabinet (1) Remove the screws of the service panel. (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover. (4) Remove the service panel. (5) Remove the screws fixing the conduit cover. (6) Remove the conduit cover. (7) Remove the top panel. (8) Remove the valve cover. (9) Disconnect the power supply and indoor/outdoor connecting wire. (10) Remove the screws of the cabinet. (11) Remove the cabinet. (12) Remove the screws of the back panel. (13) Remove the back panel. Photo 1 Screws of the top panel Screws of the cabinet Photo 2 Screws of the top panel Screws of the back panel Screws of the back panel Screws of the back panel Screws of the cabinet Screws of the cabinet Photo 3 Screws of the conduit cover Photo 4 Screw of the conduit plate Screws of the cabinet Screws of the back panel Screws of the back panel Screws of the service panel Screw of the valve cover OBH733F 71 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the inverter assembly, inverter P.C. board and relay P.C. board (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the lead wire to the reactor and the following con- nectors: <Inverter P.C. board> CN601 (Defrost heater) (MUZ-GL24NAH) CN602 (R.V. coil) (MUZ) CN931, CN932 (Fan motor) CN671 (Defrost thermistor (MUZ), discharge temperature thermistor and outdoor heat exchanger temperature thermistor) CN672 (Ambient temperature thermistor) CN724 (LEV) Photo 5 Inverter P.C. board Screw of the relay panel Ground wires Screws of the P.B. support (3) Remove the compressor connector. (4) Remove the screws fixing the relay panel. (5) Remove the relay panel. (6) Remove the ground wires and the lead wires of the inverter P.C. board. (7) Remove the screws of the P.B. support. (8) Remove the inverter P.C. board from the P.B. support. Screws of the P.B. support Screw of the relay panel Screw of the relay panel 3. Removing R.V. coil (MUZ) (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the following connector: <Inverter P.C. board> CN602 (R.V. coil) (MUZ) (3) Remove the R.V. coil. Photo 6 Screw of the R.V. coil (MUZ) Brazed parts of 4-way valve OBH733F 72 OPERATING PROCEDURE PHOTOS/FIGURES 4. Removing the discharge temperature thermistor, defrost thermistor (MUZ), outdoor heat exchanger temperature thermistor and ambient temperature thermistor (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C. board> CN671 (Defrost thermistor (MUZ), discharge temperature thermistor and outdoor heat exchanger temperature thermistor) CN672 (Ambient temperature thermistor) (3) Pull out the discharge temperature thermistor from its holder. (4) Pull out the defrost thermistor from its holder. (5) Pull out the outdoor heat exchanger temperature thermistor from its holder. (6) Pull out the ambient temperature thermistor from its holder. Photo 7 Outdoor heat exchanger temperature thermistor Ambient temperature thermistor 5. Removing outdoor fan motor (1) Remove the top panel, cabinet and service panel. (Refer to section 1.) (2) Disconnect the following connectors: <Inverter P.C. board> CN931 and CN932 (Fan motor) (3) Remove the propeller. (4) Remove the screws fixing the fan motor. (5) Remove the fan motor. NOTE: The propeller fan nut is a reverse thread. Photo 8 Defrost thermistor (MUZ) Screws of the outdoor fan motor 6. Removing the compressor and 4-way valve (1) Remove the top panel, cabinet and service panel. (Refer to section 1.) (2) Remove the back panel. (Refer to section 1.) (3) Remove the inverter assembly. (Refer to section 2.) (4) Recover gas from the refrigerant circuit. NOTE: Recover gas from the pipes until the pressure gauge shows 0 PSIG. (5) Detach the brazed part of the suction and the discharge pipes connected with compressor. (6) Remove the compressor nuts. (7) Remove the compressor. (8) Detach the brazed parts of 4-way valve and pipes. (Photo 6) Photo 9 Brazed part of the discharge pipe Discharge temperature thermistor OBH733F Brazed part of the suction pipe 73 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2015 MITSUBISHI ELECTRIC CORPORATION Issued: Nov. 2018. No.OBH733 REVISED EDITION-F Issued: Jul. 2017. No. OBH733 REVISED EDITION-E Issued: Mar. 2017. No. OBH733 REVISED EDITION-D Issued: Sep. 2016. No. OBH733 REVISED EDITION-C Issued: Jan. 2016. No. OBH733 REVISED EDITION-B Issued: Nov. 2015. No. OBH733 REVISED EDITION-A Published: Sep. 2015. No. OBH733 Made in Japan Specifications are subject to change without notice.PDFium PDFium