Mitsubishi Electric MUZ-GL09NA-U8 Service Manual
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INDOOR UNIT
OUTDOOR UNIT
SERVICE MANUAL
Models
MUZ-GL09NA -
U1
MUZ-GL12NA -
U1
MUZ-GL15NA -
U1
MUZ-GL18NA -
U1
MUZ-GL24NA -
U1
MUZ-GL18/24NA
MUZ-GL18/24NAH
MUY-GL18/24NA
MUZ-GL09NAH -
,
,
U2
U8
MUZ-GL12NAH -
,
U2
MUZ-GL15NAH -
,
U2
MUZ-GL18NAH -
MUZ-GL24NAH -
,
U2
Revision G:
• MUZ-GL09/12/15NA(H)-
MUY-GL09/12/15NA-
OBH733 REVISED EDITION-F is void.
HFC
utilized
R410A
MUY-GL09NA -
,
,
U1
U2
U8
MUY-GL12NA -
,
U1
U2
MUY-GL15NA -
,
U1
U2
MUY-GL18NA -
U1
MUY-GL24NA -
U1
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 ···················· 65
PARTS CATALOG (OBB733)
and
U2
have been added.
U2
No. OBH733
REVISED EDITION-G
,
U1
U2
,
U1
U2
,
U1
U2
U1
U1
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Table of Contents
Related Manuals for Mitsubishi Electric MUZ-GL09NA-U8
Summary of Contents for Mitsubishi Electric MUZ-GL09NA-U8
- Page 1 Revision G: • MUZ-GL09/12/15NA(H)- MUY-GL09/12/15NA- have been added. OBH733 REVISED EDITION-F is void. INDOOR UNIT OUTDOOR UNIT No. OBH733 utilized REVISED EDITION-G SERVICE MANUAL R410A Models MUZ-GL09NA - MUZ-GL09NAH - MUY-GL09NA - MUZ-GL12NA - MUZ-GL12NAH - MUY-GL12NA - MUZ-GL15NA - MUZ-GL15NAH - MUY-GL15NA - MUZ-GL18NA -...
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Page 2: Technical Changes
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. -
Page 3: Part Names And Functions
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 OBH733G... - Page 4 MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA Unit: inch MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA REQUIRED SPACE *1 20 in. (500 mm) or more when front and sides of the unit are clear 16-7/16 Air in 1-9/16 Air in Air out 2-holes 13/32 13/16 6-7/8 19-11/16 *2 When any 2 sides of left, right and rear of the unit are clear 3-3/16 33-1/16...
- Page 5 MUZ-GL18NA OBH733G...
- Page 6 MUZ-GL18NAH OBH733G...
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Page 7: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA Unit: Inch (mm) 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) Muffler Outdoor heat exchanger Stop valve temperature (with service port) thermistor Outdoor Muffler Discharge heat... -
Page 8: Additional Refrigerant Charge (R410A: Oz.)
MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Refrigerant piping: ft. Piping size O.D: in. Model Max. Length Max. Height difference Liquid 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 Indoor unit Max. Height difference Max. - Page 9 NOTE: Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation. Refrigerant piping length (one way): ft. Outdoor unit Model precharged MUZ-GL18NA MUZ-GL18NAH 3 lb. 9 oz. 1.08 3.24 5.40 7.56 9.72 11.88 14.04 16.20 MUY-GL18NA Calculation: X oz. = 1.08/5 oz./ft. × (Refrigerant piping length (ft.) - 25) NOTE: Refrigerant piping exceeding 33 ft.
- Page 10 2) COOLING CAPACITY CORRECTIONS Refrigerant piping length (one way: ft.) 25 (std.) MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA MUZ-GL12NA MUZ-GL12NAH 0.988 0.967 MUY-GL12NA MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA MUZ-GL18NA MUZ-GL18NAH 0.985 0.963 0.933 MUY-GL18NA MUZ-GL24NA MUZ-GL24NAH 0.983 0.956 0.921 MUY-GL24NA 3) HEATING CAPACITY CORRECTIONS Refrigerant piping length (one way: ft.) 25 (std.) MUZ-GL09NA MUZ-GL09NAH...
- Page 11 4) HEATING CAPACITY (MUZ) Indoor air Outdoor intake air WB temperature (˚F) Model IDB (˚F) 0.42 0.54 0.63 0.70 10.6 0.74 11.0 0.75 12.4 0.78 MUZ-GL09NA 0.41 0.52 0.62 0.68 10.9 0.72 11.2 0.73 12.7 0.76 0.39 0.50 0.59 10.0 0.67 11.2 0.70...
- Page 12 7-2. PERFORMANCE CURVE Cooling Cooling capacity (at Rated frequency) Indoor intake air Wet-bulb temperature( F) Outdoor intake air DB temperature(°F) MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA SHF at rating condition = 0.82 = 399 CFM Airflow Outdoor intake air DB temperature (°F) MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA SHF at rating condition = 0.77 SHF at rating condition = 0.78...
- Page 13 MUZ-GL18NA MUZ-GL18NAH = 646 CFM = 646 CFM Airflow Airflow Outdoor intake air WB temperature (°F) Outdoor intake air WB temperature (°F) MUZ-GL24NA MUZ-GL24NAH Airflow = 738 CFM = 738 CFM Airflow Outdoor intake air WB temperature (°F) Outdoor intake air WB temperature (°F) This value of frequency is not the same as the actual frequency in operating.
- Page 14 MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA (PSIG) (PSIG) 100 105 (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA (PSIG) (PSIG) 68 70 100 105 (°F) 68 70 100 105 (°F) Outdoor ambient temperature Outdoor ambient temperature OBH733G...
- Page 15 MUZ-GL15NA MUZ-GL15NAH (PSIG) (PSIG) 58Hz 58Hz (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature MUZ-GL18NA MUZ-GL18NAH (PSIG) (PSIG) 81Hz 81Hz (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature MUZ-GL24NA MUZ-GL24NAH (PSIG) (PSIG) 58Hz 58Hz (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature OBH733G...
- Page 16 Model MSZ-GL18NA MSY-GL18NA MSZ-GL24NA MSY-GL24NA Item Unit Cooling Heating Cooling Cooling Heating Cooling Capacity Btu/h 18,000 21,600 18,000 22,500 27,600 22,500 — 0.87 — 0.87 0.75 — 0.75 Input 1.34 1.68 1.34 1.80 2.34 1.80 Rated 67.5 82.0 67.5 Indoor unit MSZ-GL18NA MSY-GL18NA MSZ-GL24NA...
- Page 17 MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA MUZ-GL15NA MUZ-GL15NAH Correction of Cooling capacity Correction of Cooling total input Correction of Heating capacity Correction of Heating total input (Hz) (Hz) (Hz) (Hz) The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA MUZ-GL18NA MUZ-GL18NAH...
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Page 18: Actuator Control
ACTUATOR CONTROL 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 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. -
Page 19: Service Functions
SERVICE FUNCTIONS 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 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... -
Page 20: Troubleshooting
TROUBLESHOOTING 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 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. -
Page 21: Trouble Criterion Of Main Parts
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 Check method and criterion Figure Measure the resistance with a tester. Defrost thermistor (RT61) (MUZ) Refer to 10-6. “Test point diagram and voltage”, 1. “Inverter P.C. board”, Fin temperature for the chart of thermistor. - Page 22 MUZ-GL18NA MUZ-GL18NAH R.V.coil/21S4 Smoothing MUY-GL18NA (CN721) capacitor (C63) Smoothing (MUZ) Smoothing capacitor Heater connector 208/230 V AC DB61 Back side of unit (CN722) capacitor (C62) (C61) 260 - 370 V DC (MUZ-GL18NAH) Fuse (F701) Fuse (F801) 208/230 V AC T3.15AL250V T3.15AL250V Fuse (F901) T3.15AL250V...
- Page 23 11-2. MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the cabinet Photo 1 (1) Remove the screws of the service panel. (2) Remove the screws of the top panel. Screws of the top panel (3) Remove the screw of the valve cover.
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Page 24: Operating Procedure
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:...