Revision H: • 10-6. Voltage values of MUZ-GL09/12/15NA- U2 , MUZ-GL09/12/15NAH- U2 and MUY-GL09/12/15NA- U2 have been corrected. OBH733 REVISED EDITION-G is void. INDOOR UNIT OUTDOOR UNIT HFC SERVICE MANUAL utilized R410A No.
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.
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 OBH733H 3
3 SPECIFICATION MUZMUYGL09NA- U1 GL09NA- U2 GL09NA- U8 GL09NA- U1 GL09NAGL09NAH- U1 GL09NAH- U2 GL09NAH- U8 Outdoor unit model Cooling 1 Capacity Rated (Minimum~Maximum) Capacity Rated (Maximum) Power consumption Rated (Minimum~Maximum) Btu/h Heating 47 1 (MUZ) Btu/h Heating 17 2 (MUZ) Btu/h Cooling 1 Power consumption Heating 17 2 (MUZ) W Rated (Maximum) Cooling HSPF IV 4 Heating (MUZ) 10,900 (4,500 - 15,900) 6,700 (10,200) W Heating 47 1 (MUZ) W EER 1 [SEER] 3 9,000 (3,600 - 12,200) COP
MUZ- Outdoor unit model Capacity Rated (Minimum~Maximum) Capacity Rated (Maximum) Power consumption Rated (Minimum~Maximum) Cooling 1 Btu/h Heating 47 1 (MUZ) Btu/h Heating 17 2 (MUZ) Btu/h Cooling 1 W Heating 47 1 (MUZ) W MUY- GL15NA GL15NAH GL15NA 14,000 (3,100 - 18,200) 18,000 (4,800 - 20,900) 12,200 (16,400) 1,080 (210 - 2,000) 1,600 (200 ~ 2,010) 1,190 (1,850) 13.0 [21.6] NA: 11.7 NAH: 10.8 3.
Test condition 3, 4 ARI Mode Indoor air condition (°F) Dry bulb Wet bulb Test Outdoor air condition (°F) Dry bulb Wet bulb "A-2" Cooling Steady State at rated compressor Speed 80 67 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.
4 OUTLINES AND DIMENSIONS Unit: inch MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA *1 4 in. (100 mm) or more when front and sides of the unit are clear clear *1 REQUIRED SPACE ) m 0m (10 re n. r mo i 4 o 4 in .( or 100 m mo re m) (GL09/12/15NA) (GL09/12/15NAH) ) mm 00 . (2 ore *2 n i 8 rm o 14 in.
MUZ-GL18NA MUZ-GL24NA MUZ-GL18NAH MUZ-GL24NAH MUY-GL18NA MUY-GL24NA Unit: inch Clear *1 REQUIRED SPACE *1 20 in. (500 mm) or more when front and sides of the unit are clear 16-7/16 2 13 Drain hole 1-9/16 1-5/8 00 . (1 4 in more or 4i or mn. (10 ore 0 mm ) Air in m) 2-holes 13/32 13/16 6-7/8 19-11/16 33-1/16 4-5/16 14 or min. (3 ore 50 m m m 500 2 in.
5 WIRING DIAGRAM MUZ-GL09NA- U1 , U8 MUZ-GL12NA- U1 MUZ-GL09NA- U2 MUZ-GL12NA- U2 OBH733H 9
MUZ-GL09NAH- U1 , U8 MUZ-GL12NAH- U1 MUZ-GL09NAH- U2 MUZ-GL12NAH- U2 OBH733H 10
MUY-GL09NA- U1 MUY-GL09NA- U2 OBH733H MUY-GL12NA- U1 MUY-GL12NA- U2 11
MUZ-GL15NA- U1 MUZ-GL15NA- U2 OBH733H 12
MUZ-GL15NAH- U1 MUZ-GL15NAH- U2 OBH733H 13
MUY-GL15NA- U1 MUY-GL15NA- U2 OBH733H 14
MUZ-GL18NA OBH733H 15
MUZ-GL18NAH OBH733H 16
MUY-GL18NA OBH733H 17
MUZ-GL24NA OBH733H 18
MUZ-GL24NAH OBH733H 19
MUY-GL24NA OBH733H 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) (with heat insulator) Unit: Inch (mm) 4-way valve Muffler Stop valve (with service port) Flared connection Service port Service port Ambient temperature thermistor RT65 Compressor Defrost thermistor RT61 (MUZ) Capillary tube O.D. 0.118 × I.D. 0.079 × 9-7/16 (ø3.0 × ø2.
MUZ-GL24NA - U1 MUY-GL24NA Refrigerant pipe ø5/8 (ø15.88) (with heat insulator) Muffler with #100 mesh strainer 4-way valve Stop valve (with service port) Flared connection Unit: inch Service port Service port Discharge temperature thermistor RT62 Defrost thermistor RT61 (MUZ) Compressor Flared connection LEV Strainer #100 Stop valve Refrigerant pipe ø3/8 (ø9.
MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Model Refrigerant piping: ft. Max. Length Max. Height difference A B Piping size O.D: in. Gas Liquid MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA 65 40 3/8 1/4 MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA 65 40 1/2 1/4 MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA 100 50 1/2 1/4 MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA 100 50 5/8 3/8 Indoor unit Max. Height difference B Max.
NOTE: Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation. Model Outdoor unit precharged 25 30 MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA 3 lb. 9 oz. 0 1.08 Refrigerant piping length (one way): ft. 40 50 60 70 80 3.24 5.40 7.56 9.72 11.88 90 100 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.
2) COOLING CAPACITY CORRECTIONS Model Refrigerant piping length (one way: ft.) 25 (std.) 40 65 100 MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA 1.0 0.988 0.967 - MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA 1.0 0.985 0.963 0.933 MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA 1.0 0.983 0.956 0.921 3) HEATING CAPACITY CORRECTIONS Model Refrigerant piping length (one way: ft.) 25 (std.
4) HEATING CAPACITY (MUZ) Indoor air Model MUZ-GL09NA MUZ-GL09NAH MUZ-GL12NA MUZ-GL12NAH MUZ-GL15NA MUZ-GL15NAH MUZ-GL18NA MUZ-GL18NAH MUZ-GL24NA MUZ-GL24NAH IDB (˚F) 75 70 65 75 70 65 75 70 65 75 70 65 75 70 65 75 70 65 75 70 65 75 70 65 75 70 65 75 70 65 5 TC 4.8 5.2 5.5 4.8 5.2 5.5 6.3 6.8 7.2 6.3 6.8 7.2 7.9 8.6 9.0 7.9 8.6 9.0 9.5 10.3 10.8 9.5 10.3 10.8 12.1 13.1 13.8 12.1 13.1 13.8 15 TPC 0.42 0.41 0.39 0.55 0.54 0.52 0.65 0.62 0.59 0.78 0.75 0.72 0.94 0.90 0.86 1.07 1.03 0.99 0.99 0.
7-2. PERFORMANCE CURVE Cooling Cooling capacity (at Rated frequency) Capacity correction factors 1.5 Indoor intake air Wet-bulb temperature( F) 1.4 1.3 1.2 79 1.1 75 1.0 0.9 14 23 32 41 50 59 68 77 86 95 104 72 68 64 113 Outdoor intake air DB temperature(°F) SHF at rating condition = 0.82 Airflow = 399 CFM 71 67 63 0.6 0.5 0.4 0.2 e air r intak 0.
Heating Heating capacity (at Rated frequency) 59 68 79 Capacity correction factor 1.3 1.2 1.1 1.0 0.9 0.8 oo Ind 0.7 ir ea ak t r in lb bu yDr e( tur ra pe tem F) 0.6 0.5 0.4 5 14 23 32 41 50 Outdoor intake air WB temperature (°F) 59 Airflow = 406 CFM 75 70 65 Indoor 5 intake air DB ture mpera te (°F) 15 25 35 45 55 Outdoor intake air WB temperature (°F) 65 Total power consumption (kW) MUZ-GL12NA 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.
MUZ-GL18NAH 2.0 1.8 1.6 75 70 65 Total power consumption (kW) Airflow = 646 CFM 1.4 1.2 B temp e air D 1.0 intak Indoor 0.8 0.6 (°F) erature -5 5 15 25 35 45 55 Outdoor intake air WB temperature (°F) 65 Total power consumption (kW) MUZ-GL24NA 75 70 65 1.8 1.6 1.4 1.2 ke air DB 1.0 ta Indoor in 0.8 0.6 -5 5 ture (°F) tempera 15 25 35 45 55 Outdoor intake air WB temperature (°F) Airflow = 738 CFM 3.0 75 70 65 2.6 2.2 1.8 Indoor in 0 F) rature (° B tempe ke air D ta 1.4 1.
7-3. CONDENSING PRESSURE Cooling Data are based on the condition of indoor humidity 50 %. Airflow should be set to High speed.
MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA (PSIG) 500 400 B or D o Ind ture a per tem ) (°F 86 80 75 70 350 300 250 200 65 (PSIG) 180 Suction pressure Condensing pressure 450 70 75 80 85 90 95 Outdoor ambient temperature 100 105 (°F) 86 80 75 70 160 140 120 rature (°F) Indoor DB tempe 100 80 65 70 75 80 85 90 95 Outdoor ambient temperature 100 105 (°F) MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA (PSIG) 480 re 420 390 360 r oo Ind DB tu era ) (°F mp te 330 300 270 6870 (PSIG) 180 8
Heating Data are based on the condition of outdoor humidity 75%. Airflow should be set to High speed. Data are for heating operation without any frost.
MUZ-GL15NA MUZ-GL15NAH (PSIG) 500 75 70 65 Ind 400 ) (°F 350 140 115 15 25 35 45 55 Outdoor ambient temperature 65 I DB e r tu ra pe m te ) (°F 65 58Hz 5 or o nd 90 300 250 75 70 65 165 e mp B te D oor re ratu Suction pressure Condensing pressure 450 (PSIG) 190 40 75 (°F) 58Hz 5 15 25 35 45 55 Outdoor ambient temperature 65 75 (°F) MUZ-GL18NA MUZ-GL18NAH (PSIG) 550 (PSIG) 200 450 DB oor 400 Ind ture a per tem 75 70 65 ) (°F 350 300 250 175 Suction
7-4. STANDARD OPERATION DATA MSZ-GL09NA MSZ-GL09NA - Model Item Total Electrical circuit U8 MSY-GL09NA MSY-GL09NA - Cooling Heating Cooling Heating Cooling 9,000 10,900 9,000 10,900 9,000 SHF — 0.82 — 0.82 — 0.82 Input kW 0.585 0.72 0.585 0.72 0.585 Rated Hz 59.5 72 48 59 59.5 Power supply V, phase, Hz Input Fan motor current Power supply Input Fan motor current MSY-GL09NA 208/230, 1, 60 208/230, 1, 60 208/230, 1, 60 0.022 0.023 0.022 0.023 0.022 0.24/0.22 0.
MSZ-GL12NA Model Item Total Capacity Unit Cooling Heating Cooling Cooling Heating Cooling 12,000 14,400 12,000 14,000 18,000 14,000 — 0.77 — 0.77 0.78 — 0.78 Input kW 0.920 1.10 0.920 1.080 1.60 1.080 Rated Hz 70 77 70 56.5 74 56.5 Electrical circuit V, phase, Hz Input Fan motor current Power supply Fan motor current MSY-GL12NA MSZ-GL15NA MSY-GL15NA 208/230, 1, 60 208/230, 1, 60 208/230, 1, 60 208/230, 1, 60 0.022 0.023 0.022 0.043 0.030 0.043 A 0.
MSZ-GL18NA Model Item Total Capacity Cooling Heating Cooling Cooling Heating Cooling Btu/h 18,000 21,600 18,000 22,500 27,600 22,500 — 0.87 — 0.87 0.75 — 0.75 Input kW 1.34 1.68 1.34 1.80 2.34 1.80 Rated Hz 69 81 69 67.5 82.0 67.5 Electrical circuit V, phase, Hz Input Fan motor current Power supply MSZ-GL18NA MSY-GL18NA MSZ-GL24NA MSY-GL24NA 208/230, 1, 60 208/230, 1, 60 208/230, 1, 60 208/230, 1, 60 kW 0.045 0.045 0.058 0.058 A 0.46/0.42 0.46/0.
7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY Input correction factors Capacity correction factors 2.0 1.5 1.0 0.5 0 25 50 75 100 (Hz) The operational frequency of compressor Correction of Cooling total input 2.0 Capacity correction factors Correction of Cooling capacity 2.0 1.5 1.0 0.5 0 25 50 75 Correction of Heating capacity 1.5 1.0 0.5 100 (Hz) 0 The operational frequency of compressor 50 100 Correction of Heating total input 2.
MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA 1.0 0.5 0 25 50 75 100 (Hz) The operational frequency of compressor 1.5 1.5 1.0 1.0 0.5 0.5 0 25 50 75 100 (Hz) 0 The operational frequency of compressor 1.0 0.5 0 30 60 90 120 2.0 1.5 1.0 0.5 0.5 0 30 60 90 0 120 150 (Hz) 0 2.0 30 60 90 120 150 (Hz) MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA 50 100 150(Hz) The operational frequency of compressor 1.5 2.0 Correction of Heating capacity 1.0 0.
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 15 seconds ON Compressor OFF ON Outdoor fan motor OFF 8-2.
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 To change the defrost finish temperature, cut/solder the JS wire of the outdoor inverter P.C. board (Refer to 10-6.1.).
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.
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.
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).
3. Table of outdoor unit failure mode recall function The upper lamp of the OPERATION INDICATOR lamp (Indoor unit) OFF 1-time blink 2.5 seconds OFF Abnormal point (Failure mode/protection) None (Normal) Indoor/outdoor communication, receiving error Indoor/outdoor communication, receiving error LED indication (Outdoor P.C. board) — — — 2-time blink 2.5 seconds OFF Outdoor power system 3-time blink 2.5 seconds OFF Discharge temperature thermistor Defrost thermistor 1-time blink every 2.
NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-3.). The upper lamp of the Abnormal point OPERATION (Failure mode/protection) INDICATOR lamp (Indoor unit) 10-time blink Discharge temperature 2.5 seconds OFF 11-time blink 2.5 seconds OFF 14-time blink 2.5 seconds OFF 16-time blink 2.5 seconds OFF Bus-bar voltage (DC) Each phase current of compressor Stop valve (Closed valve) LED indication (Outdoor P.C. board) — 8-time blink 2.5 seconds OFF 9-time blink 2.
10-3. TROUBLESHOOTING CHECK TABLE No. 1 Symptom Outdoor unit does not operate. Abnormal point/ Condition 1-time blink every Outdoor power sys2.5 seconds tem 4 5 6 Remedy Overcurrent protection cut-out operates 3 consecutive times within 1 minute after the compressor gets started. • Reconnect connector of compressor. • Refer to 10-5. "How to check inverter/compressor". • Check stop valve. Outdoor thermistors Discharge temperature thermistor, fin temperature thermistor, • Refer to 10-5.
No. Symptom Outdoor unit operates. LED indication 1-time blink 2.5 seconds OFF Abnormal point/ Condition Frequency drop by current protection 16 20 Current from power outlet is nearing breaker capacity. Frequency drop by defrosting in COOL mode Indoor coil thermistor reads 46°F (8°C) or less in COOL mode, compressor frequency lowers. 4-time blink 2.
10-4. TROUBLE CRITERION OF MAIN PARTS MUZ-GL09NA MUZ-GL12NA MUZ-GL15NA MUZ-GL18NA MUZ-GL24NA MUZ-GL09NAH MUZ-GL12NAH MUZ-GL15NAH MUZ-GL18NAH MUZ-GL24NAH Part name Defrost thermistor (RT61) (MUZ) Fin temperature thermistor (RT64) MUY-GL09NA MUY-GL12NA MUY-GL15NA MUY-GL18NA MUY-GL24NA Check method and criterion Measure the resistance with a tester. Figure Refer to 10-6. “Test point diagram and voltage”, 1. “Inverter P.C. board”, for the chart of thermistor.
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). See 10-5. Check the voltage between terminals. Are the voltages balanced? Yes No Replace the inverter P.C. board. See 10-5. Check the compressor. “Check of open phase”. “Check of compressor”.
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. <> At 3 points BLK-WHT Measure the resistance between the lead wires at 3 points. BLK-RED WHT-RED <> Refer to 10-4.
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 No Replace the thermistor except RT64. When RT64 is abnormal, replace the inverter P.C. board. Reconnect the connector of thermistor. Turn ON the power supply and press EMERGENCY OPERATION switch.
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).
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 terminal of outdoor fan motor normal? (Refer to 10-4.) No Yes 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.
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.
MSZ-GL06/09/12/15NA MSY-GL09/12/15NA K Check of LEV (Expansion valve) Turn ON the power supply. 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.
L Check of inverter P.C. board Check the outdoor fan motor. (Refer to 10-5. .) Is the fuse (F901) blown on the inverter P.C. board? No Yes 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 inverter P.C. board. Does the LED blink 10 times? Yes (10-time blink) No Check the corresponding parts following LED indication. (Refer to 10-3.
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? Yes Check the power supply. No Turn ON the power supply. Is there rated voltage between the outdoor terminal block S1 and S2? Yes No Check the wiring. Press EMERGENCY OPERATION switch once.
MUZ-GL18/24NA MUZ-GL18/24NAH MUY-GL18/24NA Turn OFF the power supply. Is there rated voltage in the power supply? Yes Check the power supply. No Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and S2? Yes No Check the wiring. Press EMERGENCY OPERATION switch once. Does the OPERATION INDICATOR lamp light up? Yes Is serial signal error indicated 6 minutes later? Yes A Turn OFF the power supply.
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.
P Electromagnetic noise enters into TV sets or radios Is the unit grounded? Yes Is the distance between the antennas and the indoor unit within 9.91 ft. (3m), or is the distance between the antennas and the outdoor unit within 9.91 ft. (3m)? No Is the distance between the TV sets or radios and the indoor unit within 3.28 ft. (1m), or is the distance between the TV sets or radios and the outdoor unit within 9.91 ft. (3m)? Ground the unit.
10-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUZ-GL09NA - U1 , U8 MUZ-GL12/15NA MUY-GL09/12/15NA- U1 U1 MUZ-GL09NAH- U1 , U8 MUZ-GL12/15NAH- U1 Smoothing capacitor (C63) DB61 260 - 370 V DC (-) (+) Back side of unit 208/230 V AC R.V.coil/21S4 Heater connector (CN721) (CN722) (MUZ) Smoothing Smoothing (MUZ-GL09/ capacitor (C62) capacitor (C61) 208/230 V AC 12/15NAH) Fuse (F701) Fuse (F801) T3.15AL250V T3.15AL250V Fuse (F901) T3.
MUZ-GL09/12/15NA - U2 MUZ-GL09/12/15NAH - U2 MUY-GL09/12/15NA- U2 Smoothing Smoothing capacitor (C62) capacitor (C61) DB61 260 - 370 V DC (-) (+) Back side of unit Fuse (F801) T3.15AL250V Smoothing capacitor (C63) 208/230 V AC R.V.coil (CN721) 208/230 V AC Fuse (F701) T3.15AL250V Output to drive compressor (LDU, LDV, LDW) LED Fuse (F901) T3.
MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA Back side of unit Smoothing capacitor (C63) DB61 260 - 370 V DC (-) (+) Smoothing capacitor (C62) R.V.coil/21S4 (CN721) (MUZ) 208/230 V AC Smoothing capacitor (C61) Fuse (F801) T3.15AL250V 208/230 V AC Heater connector (CN722) (MUZ-GL18NAH) Fuse (F701) T3.15AL250V Fuse (F901) T3.
MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA Fuse (F601) T3.15AL250V R.V. coil/21S4 (CN602) 208/230 V AC (MUZ) Heater connector (CN601) (MUZ-GL24NAH) Signal of outdoor fan motor (CN931) 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) Fuse (F901) T3.
11 DISASSEMBLY INSTRUCTIONS 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. (2) The terminal with this connector shown below has the locking mechanism.
OPERATING PROCEDURE Photo 4 PHOTOS/FIGURES Screws of the conduit cover Photo 5 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: CN721 (R.V.
OPERATING PROCEDURE PHOTOS/FIGURES 4. Removing the discharge temperature thermistor, defrost thermistor, outdoor heat exchanger temperature thermistor and ambient temperature thermistor Photo 8 Screw of the R.V. coil (MUZ) (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the lead wire to the reactor and the following connectors:
PHOTOS/FIGURES OPERATING PROCEDURE 5. Removing outdoor fan motor Photo 10 (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the following connectors: 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. Screws of the outdoor fan motor Propeller fan 6.
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.
OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the inverter assembly, inverter P.C. board Photo 5 Screws of the terminal (1) Remove the cabinet and panels. (Refer to section 1.) Screw of the heat sink block support and the (2) Disconnect the lead wire to the reactor and the following con- support and the separator back panel nectors: CN721 (R.V.
OPERATING PROCEDURE PHOTOS/FIGURES 4. Removing the discharge temperature thermistor, defrost thermistor (MUZ), outdoor heat exchanger temperature thermistor and ambient temperature thermistor Photo 8 Outdoor heat exchanger temperature thermistor 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:
11-3. MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES Photo 1 1. Removing the cabinet (1) (2) (3) (4) (5) (6) (7) (8) (9) Remove the screws of the service panel. Remove the screws of the top panel. Remove the screw of the valve cover. Remove the service panel. Remove the screws fixing the conduit cover. Remove the conduit cover. Remove the top panel. Remove the valve cover.
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 connectors: CN601 (Defrost heater and heater protector) (MUZ-GL24NAH) CN602 (R.V.
OPERATING PROCEDURE PHOTOS/FIGURES 4. Removing the discharge temperature thermistor, defrost thermistor (MUZ), outdoor heat exchanger temperature thermistor and ambient temperature thermistor Photo 7 Outdoor heat exchanger temperature thermistor 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:
OBH733H 75
HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2015 MITSUBISHI ELECTRIC CORPORATION Issued: Aug. 2019. No. OBH733 REVISED EDITION-H Issued: Apr. 2019. No. OBH733 REVISED EDITION-G 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.
