Page 2 - Use the specified refrigerant only; Never use any refrigerant other than that specified.; WARNING; refrigerant pipes. The compressor may burst if air etc. get into it.
2 Use the specified refrigerant only Never use any refrigerant other than that specified. Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of. Correct refrigerant is specified in the manuals and on the spec labels provided with our products. We wil...
Page 3 - TECHNICAL CHANGES; Piping; PART NAMES AND FUNCTIONS; Air outlet
3 1 TECHNICAL CHANGES MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA Piping Air outlet Drain outlet Air inlet (back and side) Drain hose PART NAMES AND FUNCTIONS 2 MUZ-GL09NA - U1 MUZ-GL09NAH - U1 MUY-GL09NA - U1 MUZ-GL09NA - U8 MUZ-GL09NAH - U8 MUZ-GL12NA - U1 MUZ-GL12NAH - U1 ...
Page 4 - SPECIFICATION; Airflow; MUZ; External finish; NOTE
4 3 SPECIFICATION Outdoor unit model MUZ- MUY- MUZ- MUY- GL09NA - U1 GL09NAH - U1 GL09NA - U2 GL09NAH - U2 GL09NA - U8 GL09NAH - U8 GL09NA - U1 GL09NA - U2 GL12NA GL12NAH GL12NA Capacity Rated (Minimum~Maximum) Cooling *1 Btu/h 9,000 (3,600 - 12,200) 12,000 (1,500 - 13,600) Heating 47 *1 ( MUZ ) Btu...
Page 5 - Height difference
5 Outdoor unit model MUZ- MUY- MUZ- MUY- MUZ- MUY- GL15NA GL15NAH GL15NA GL18NA GL18NAH GL18NA GL24NA GL24NAH GL24NA Capacity Rated (Minimum~Maximum) Cooling *1 Btu/h 14,000 (3,100 - 18,200) 18,000 (5,800 ~ 22,000) 22,500 (8,200 ~ 31,400) Heating 47 *1 ( MUZ ) Btu/h 18,000 (4,800 - 20,900) - 21,600 ...
Page 6 - Test condition; OPERATING RANGE
6 Test condition ARI Mode Test Indoor air condition (°F) Outdoor air condition (°F) Dry bulb Wet bulb Dry bulb Wet bulb SEER (Cooling) "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) "B-1" C...
Page 7 - OUTLINES AND DIMENSIONS; REQUIRED SPACE
7 OUTLINES AND DIMENSIONS 4 clear *1 *1 4 in. (100 mm) or more when front and sides of the unit are clear *2 When any 2 sides of left, right and rear of the unit are clear holes (GL09/12/15NA) (GL09/12/15NAH) REQUIRED SPACE Liquid refrigerant pipe joint Refrigerant pipe (flared) Ø 1/4 Gas refrigeran...
Page 9 - WIRING DIAGRAM
9 5 WIRING DIAGRAM MUZ-GL09NA- U1 , U8 MUZ-GL12NA- U1 MUZ-GL09NA- U2 MUZ-GL12NA- U2 OBH733J
Page 21 - REFRIGERANT SYSTEM DIAGRAM; Service port
21 6 REFRIGERANT SYSTEM DIAGRAM Unit: Inch (mm) MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA Outdoor heat exchanger Flared connection Defrost thermistor RT61 ( MUZ ) Discharge temperature thermistor RT62 Flared connection Stop valve Capillary tube O.D. 0.157× I.D. 0.094× 3-15/16 (ø4.0×ø2.4×100) Capillary tube ...
Page 23 - MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE; Max. Height difference
23 Max. Length A Max. Height difference B Indoor unit Outdoor unit MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Model Refrigerant piping: ft. Piping size O.D: in. Max. Length A Max. Height difference B Gas Liquid MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA 65 40 ...
Page 24 - DATA; ) COOLING CAPACITY; SHC is based on 80 ̊F of indoor Intake air DB temperature.
24 NOTE : Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation. Model Outdoor unit precharged Refrigerant piping length (one way): ft. 25 30 40 50 60 70 80 90 100 MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA 3 lb. 9 oz. 0 1.08 3.24 5.40 7.56 9.72 11.88 14.04 1...
Page 25 - ) COOLING CAPACITY CORRECTIONS; ) HEATING CAPACITY CORRECTIONS; Model
25 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...
Page 27 - Cooling; between frequency and capacity.
27 7-2. PERFORMANCE CURVE Cooling 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. MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA Cooling capacity (at Rated frequency) 0.9 1.0 1.1 1.2 1.3 1.4 1.5 14 23 32 41 5...
Page 28 - Heating
28 Heating Outdoor intake air WB temperature (°F) -4 5 14 23 32 41 50 59 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 Heating capacity (at Rated frequency) Capacity correction factor 59 68 79 Indoor intake air Dry-bulb temperature ( F) MUZ-GL09NA MUZ-GL12NA MUZ-GL09NAH MUZ-GL12NAH MUZ-GL15NA MUZ-GL15NAH ...
Page 30 - Data are based on the condition of indoor humidity 50 %.
30 7-3. CONDENSING PRESSURE Cooling Data are based on the condition of indoor humidity 50 %. Airflow should be set to High speed. MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA 65 70 75 80 85 90 95 100 105 200 250 300 350 400 450 (°F) (°F) 65 70...
Page 32 - Data are based on the condition of outdoor humidity 75%.
32 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-GL09NA - U1 , U2 MUZ-GL09NAH - U1 , U2 75 7065 75 70 65 (PSIG) Condensing pressure Outdoor ambient temperature (°F) (°F) (PSIG) Suction press...
Page 37 - -5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY
37 Capacity correction factors Input correction factors Correction of Cooling capacity The operational frequency of compressor Correction of Cooling total input The operational frequency of compressor (Hz) (Hz) Capacity correction factors Input correction factors Input correction factors Capacity co...
Page 39 - ACTUATOR CONTROL; The fan motor turns ON/OFF, interlocking with the compressor.; -3. RELATION BETWEEN MAIN SENSOR AND ACTUATOR
39 8 ACTUATOR CONTROL 8-2. R.V. COIL CONTROL (MUZ) Heating . . . . . . . . . . . . . . . . . ON Cooling . . . . . . . . . . . . . . . . . OFF Dry . . . . . . . . . . . . . . . . . . . . OFF NOTE : The 4-way valve reverses for 5 seconds right before startup of the compressor. ON OFF ON OFF Outdoor fa...
Page 40 - SERVICE FUNCTIONS
40 SERVICE FUNCTIONS 9 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.). Jumper Defrost finish temperature MUZ-GL09/12/15NA MUZ-GL09/12/15NAH MUZ-...
Page 41 - 0 TROUBLESHOOTING; Before troubleshooting, check the following; burnt or discolored components.
41 10 TROUBLESHOOTING 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...
Page 42 - Outline of the function; Flow chart of failure mode recall function; Operational procedure
42 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. 10-2. FAILURE MODE RECALL FUNCTION 1. Flow chart of fai...
Page 44 - Table of outdoor unit failure mode recall function; Blinking patterns of this mode differ from the ones of
44 3. Table of outdoor unit failure mode recall function The upper lamp of the OPERATION INDICATOR lamp (Indoor unit) Abnormal point (Failure mode/protection) LED indication (Outdoor P.C. board) Condition Remedy Indoor/outdoor unit failure mode recall function Outdoor unit failure mode recall functi...
Page 48 - 0-4. TROUBLESHOOTING CRITERION OF MAIN PARTS
48 10-4. TROUBLESHOOTING 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 Check method and criterion Figure Defrost thermistor (RT61) ( MUZ ) Fin...
Page 49 - the voltage balance
49 10-5. TROUBLESHOOTING FLOW Are the voltages balanced? 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 ). Replace the inverter P.C. board. Check the voltage between terminals. Check the ...
Page 50 - Confirm that
50 F Check of compressor start failure D Check of compressor winding E Check of compressor operation time ●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 bet...
Page 51 - G Check of outdoor thermistors
51 G Check of outdoor thermistors Replace the thermistor except RT64. When RT64 is abnormal, replace the inverter P.C. board. Replace the inverter P.C. board. No No Is the resistance of thermistor normal? (Refer to 10-6.1.) Reconnect the connector of thermistor. Turn ON the power supply and press EM...
Page 53 - I Check of outdoor fan motor
53 I Check of outdoor fan motor Is the resistance between each ter- minal of outdoor fan motor normal? (Refer to 10-4.) 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...
Page 54 - J Check of power supply
54 J Check of power supply Is there voltage 208/230 V AC between the indoor terminal block S1 and S2? Yes No Replace the indoor electronic control P.C. board. Rectify indoor/outdoor connecting wire. Yes If lights up, OK. If blinks, refer to 10-3. Does the upper lamp of the OPERATION INDICATOR lamp o...
Page 55 - Properly fix the LEV coil to the expansion valve.
55 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. OK NOTE : After check of LEV, take the following steps. 1. Turn OFF the power supply and...
Page 57 - M How to check miswiring and serial signal error
57 M How to check miswiring and serial signal error • Turn OFF inverter-controlled lighting equipment. • Turn OFF the power supply and then turn ON again. • Press EMERGENCY OPERATION switch. A Is serial signal error indicated 6 minutes later? B Yes • Reinstall either the unit or the light away from ...
Page 59 - Other models
59 O Check of outdoor refrigerant circuit N Check of defrost heater (base pan heater) MUZ-GL09/12/15/18/24NAH (MUZ-GL • NAH) 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 r...
Page 60 - P Electromagnetic noise enters into TV sets or radios
60 P Electromagnetic noise enters into TV sets or radios Is the unit grounded? Ground the unit. 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)? Extend the distance between the antennas a...
Page 62 - Front side of unit
62 MUZ-GL09/12/15NA - U2 MUZ-GL09/12/15NAH - U2 MUY-GL09/12/15NA- U2 -4 14 32 50 68 86 104 0 10 20 30 40 50 60 70 80 90 100 Temperature(°F) Defrost thermistor(RT61) Ambient temperature thermistor(RT65) Outdoor heat exchanger temperature thermistor(RT68) 32 50 68 86 104 122 140 158 176 0 20 40 60 80 ...
Page 64 - LED; Heater connector
64 MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA Fin temperature thermistor/RT64 (CN673) Ambient temperature thermistor/RT65 (CN672) Discharge temperature thermistor/RT62 (CN671) Defrost thermistor /RT61 (CN671) ( MUZ ) Output to drive outdoor fan motor (CN932) Outdoor heat exchanger temperature thermistor /RT6...
Page 65 - OPERATING PROCEDURE; Removing the cabinet; ; DISASSEMBLY INSTRUCTIONS
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 PHOTOS/FIGURES 1. Removing the cabinet (1) Remove the screw fixing the service panel. (2) Pull down the service panel a...
Page 66 - Photo 4; Photo 6; Photo 7
OPERATING PROCEDURE PHOTOS/FIGURES Photo 4 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: <Inverter P.C. board> CN721 (R.V. coil) ( MUZ ) CN722 (De...
Page 67 - Removing the discharge temperature thermistor,; Photo 8
OPERATING PROCEDURE PHOTOS/FIGURES 4. Removing the discharge temperature thermistor, defrost thermistor, outdoor heat exchanger tempera- ture 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 fol...
Page 68 - Removing outdoor fan motor; Removing the compressor and 4-way valve
OPERATING PROCEDURE PHOTOS/FIGURES 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 screw...
Page 70 - Photo 5
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 con- nectors: <Inverter P.C. board> CN721 (R.V. coil) ( MUZ ) CN722 (Defrost heater a...
Page 76 - Specifications are subject to change without notice.
© Copyright 2015 MITSUBISHI ELECTRIC CORPORATION Issued: Jun. 2021. No. OBH733 REVISED EDITION-J 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...
