Mitsubishi Electric MUZ-GL12NA User manual

HFC
utilized
R410A
INDOOR UNIT
SERVICE MANUAL
No. OBH733
REVISED EDITION-J
Indoor unit service manual
MSZ-GL•NA, MSY-GL•NA Series (OBH732)
MUZ-GL18/24NA
MUZ-GL18/24NAH
MUY-GL18/24NA
PARTS CATALOG (OBB733)
OBH733 REVISED EDITION-H is void.
Revision J:
• A warning when opening or closing the valve has
been added.
CONTENTS
1. TECHNICAL CHANGES ······························3
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
OUTDOOR UNIT
Models
MUZ-GL09NA -
U1
,
U2
,
U8
MUZ-GL09NAH -
U1
,
U2
,
U8
MUY-GL09NA -
U1
,
U2
MUZ-GL12NA -
U1
,
U2
MUZ-GL12NAH -
U1
,
U2
MUY-GL12NA -
U1
,
U2
MUZ-GL15NA -
U1
,
U2
MUZ-GL15NAH -
U1
,
U2
MUY-GL15NA -
U1
,
U2
MUZ-GL18NA -
U1
MUZ-GL18NAH -
U1
MUY-GL18NA -
U1
MUZ-GL24NA -
U1
,
U2
MUZ-GL24NAH -
U1
MUY-GL24NA -
U1

2
Use the speci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.
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.
Revision G:
• MUZ-GL09/12/15NA- U2 , MUZ-GL09/12/15NAH- U2 and MUY-GL09/12/15NA- U2 have been added.
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.
<Preparation before the repair service>
Prepare the proper tools.
Prepare the proper protectors.
Provide adequate ventilation.
After stopping the operation of the air conditioner, turn off the power-supply breaker and pull the power plug.
Discharge the capacitor before the work involving the electric parts.
<Precautions during the repair service>
Do not perform the work involving the electric parts with wet hands.
Do not pour water into the electric parts.
Do not touch the refrigerant.
Do not touch the hot or cold areas in the refrigeration cycle.
When the repair or the inspection of the circuit needs to be done without turning off the power, exercise great caution not to
touch the live parts.
WARNING
• When the refrigeration circuit has a leak, do not execute pump down with the
compressor.
• When pumping down the refrigerant, stop the compressor before disconnecting the
refrigerant pipes. The compressor may burst if air etc. get into it.
• When opening or closing the valve below freezing temperatures, refrigerant may
spurt out from the gap between the valve stem and the valve body, resulting in injuries.
Revision J:
• A warning when opening or closing the valve has been added.
OBH733J

3
1TECHNICAL 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 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
1. New model
MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA
MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA
MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA
Air outlet
Drain outlet
Piping
Drain hose
Air inlet
(back and side)
MUZ-GL09NA - U1 MUZ-GL09NA - U2
MUZ-GL09NAH - U1 MUZ-GL09NAH - U2
1. Fan motor has been changed.
2. INVERTER P.C.BOARD has been changed.
3. EXPANSION VALVE has been changed.
4. 4-WAY VALVE has been changed.
5. R.V. COIL has been changed.
6. Compressor has been changed.
MUZ-GL12NA - U1 MUZ-GL12NA - U2
MUZ-GL12NAH - U1 MUZ-GL12NAH - U2
1. Fan motor has been changed.
2. INVERTER P.C.BOARD has been changed.
3. EXPANSION VALVE has been changed.
4. 4-WAY VALVE has been changed.
5. R.V. COIL has been changed.
MUY-GL09NA - U1 MUY-GL09NA - U2
1. Fan motor has been changed.
2. INVERTER P.C.BOARD has been changed.
3. EXPANSION VALVE has been changed.
4. 4-WAY VALVE has been changed.
5. Compressor has been changed.
6. Refrigerant charge has been changed.
MUY-GL12NA - U1 MUY-GL12NA - U2
1. Fan motor has been changed.
2. INVERTER P.C.BOARD has been changed.
3. EXPANSION VALVE has been changed.
4. 4-WAY VALVE has been changed.
MUZ-GL15NA - U1 MUZ-GL15NA - U2
MUZ-GL15NAH - U1 MUZ-GL15NAH - U2
MUY-GL15NA - U1 MUY-GL15NA - U2
1. Fan motor has been changed.
2. INVERTER P.C.BOARD has been changed.
3. EXPANSION VALVE has been changed.
OBH733J

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3SPECIFICATION
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/h
10,900
(4,500 - 15,900)
10,900
(4,500 - 14,100)
-
14,400
(2,000 - 18,100)
-
Capacity
Rated (Maximum) Heating 17 *2 (MUZ)Btu/h 6,700
(10,200)
7,000
(9,400)
-
9,200
(12,000)
-
Power consumption
Rated (Minimum~Maximum)
Cooling *1 W 585 (240 - 1,050) 920 (100 - 1,300)
Heating 47 *1 (MUZ)W720
(230 - 1,250)
720
(230 - 1,070)
-
1,100
(110 - 1,620)
-
Power consumption
Rated (Maximum) Heating 17 *2 (MUZ)W630
(1,060)
620
(790)
-
870
(1,240)
-
EER *1 [SEER] *3 Cooling 15.4 [24.6] 13.0 [23.1]
HSPF IV *4 Heating (MUZ)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) % 86/86 92/92 87/87 86/86 95/95
Heating (MUZ) (208/230) % 90/90 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
Compressor
Model
KNB073FRVMC KNB073FRXMC SNB092FQAMT KNB073FRVMC KNB073FRXMC SNB092FQAMT
R.L.A A 6.2 4.9 6.6 4.9
L.R.A A 7.7 6.1 8.2 6.1
Refrigeration oil
 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 *1Cooling dB(A) 48 49 49
Heating (MUZ)dB(A) 50
- 51 -
Airow
High - Med. - Low
Cooling CFM 1,102 - 639
Heating (MUZ)CFM
1,186 - 1,116 - 1,045 - 1,186 - 1,116 - 1,045 -
Fan speed
High - Med. - Low
Cooling rpm 810 - 490
Heating (MUZ) rpm
870 - 820 - 770 - 870 - 820 - 770 -
Defrost method Reverse cycle - Reverse cycle -
Dimensions
W in. 31-1/2
D in. 11-1/4
H in. 21-5/8
Weight Ib. 81
External nish 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
(Min. wall thickness)
Liquid in. 1/4 (0.0315)
Gas in. 3/8 (0.0315)
Connection method Indoor Flared
Outdoor Flared
Between the indoor
& outdoor units
Height di󰀨erence ft. 40
Piping length ft. 65
Refrigerant charge (R410A) 2 lb. 5 oz. 2 lb. 9 oz. 2 lb. 9 oz. 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: Rating conditions (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.)
OBH733J

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 (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) -
Power consumption
Rated (Minimum~Maximum)
Cooling *1 W 1,080 (210 - 2,000) 1,340 (330 ~ 2,150) 1,800 (570 ~ 3,580)
Heating 47 *1 (MUZ)W1,600
(200 ~ 2,010)
- 1,680 (320 ~ 2,500) 2,340 (520 ~ 3,650)
Power consumption
Rated (Maximum) Heating 17 *2 (MUZ)W1,190
(1,850)
-
1,480
(2,150)
-
1,770
(3,290)
-
EER *1 [SEER] *3 Cooling 13.0 [21.6] 13.4 [20.5] 12.5 [20.5]
HSPF IV *4 Heating (MUZ)NA: 11.7
-
NA: 11.2
-
NA: 10.0
-
NAH: 10.8
-
NAH: 10.2
-
NAH: 10.0
-
COP Heating *1(MUZ)3.30 - 3.77 - 3.46 -
Power factor
Cooling (208/230) % 97/97 99/99 99/99
Heating (MUZ) (208/230) % 98/98 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
Compressor
Model SNB130FQBMT SNB130FQBMT SNB172FQKMT
R.L.A A 7.4 6.8 10 12.9
L.R.A A 9.3 8.5 12.5 16.1
Refrigeration oil
 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
Sound level *1Cooling dB(A) 49 49 54 55
Heating (MUZ)dB(A) 51
- 55 - 55 -
Airow
High - Med. - Low
COOL CFM 1,102-639 1,742 - 922 2,016 - 1,769 - 890
HEAT CFM
1,186 - 1,045 - 1,045 - 1,691 - 1,691 - 1,372 - 1,701 - 1,701 - 1,341 -
Fan speed
High - Med. - Low
Cooling rpm 810 - 490 840 - 450 950 - 840 - 450
Heating (MUZ) rpm
870 - 770 - 770 - 810 - 810 - 650 - 810 - 810 - 650 -
Defrost method Reverse cycle - Reverse cycle - Reverse cycle -
Dimensions
W in. 31-1/2 33-1/16
D in. 11-1/4 13
H in. 21-5/8 34-5/8
Weight Ib. 81 121 119
External nish 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
(Min. wall thickness)
Liquid in. 1/4 (0.0315) 3/8 (0.0315)
Gas in. 1/2 (0.0315) 5/8 (0.0315)
Connection method Indoor Flared
Outdoor Flared
Between the indoor
& outdoor units
Height di󰀨erence ft. 40 50
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: Rating conditions (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.)
OBH733J

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" Cooling Steady State
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)
HSPF
(Heating)
"H1-2" Heating Steady State
at rated compressor Speed 70 60 47 43
"H3-2" Heating
at rated compressor Speed 70 60 17 15
"H0-1" Heating Steady State
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".
*3, *4
(2) OPERATION
Mode Condition
Intake air temperature (°F)
Indoor Outdoor
DB WB DB WB
Cooling
Standard temperature 80 67 95 —
Maximum temperature 90 73 115 —
Minimum temperature 67 57 14 —
Maximum humidity 78 % —
Heating
Standard temperature 70 60 47 43
Maximum temperature 80 67 75 65
Minimum temperature 70 60 -4 -5
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
OBH733J

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 refrigerant pipe joint
Refrigerant pipe (flared) Ø 3/8 (GL09/12)
Ø 1/2 (GL15)
4 in. (100 mm)
or more
14 in. (350 mm)
or more
8 in. (200 mm)
or more *2
4 in. (100 mm)
or more
Unit: inch
MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA
MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA
MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA
OBH733J

8
Unit: inch
16-7/16
1-9/16
1-5/8
Drain hole
6-7/8 19-11/16
13
2
Air in
Air in
Air out
2-holes 13/32 13/16
14-3/16
33-1/16
4-5/16
3-3/16
34-5/8
17-25/32
Service panel
3-29/32
6-1/2
7-11/16
35
44
Liquid refrigerant pipe joint
Refrigerant pipe (flared) Ø 1/4 (GL18)
Refrigerant pipe (flared) Ø 3/8 (GL24)
Gas refrigerant pipe joint
Refrigerant pipe (flared) Ø 1/2 (GL18)
Refrigerant pipe (flared) Ø 5/8 (GL24)
*1 20 in. (500 mm) or more when front
and sides of the unit are clear
14 in. (350 mm)
or more
4 in. (100 mm)
or more
REQUIRED SPACE
Clear *1
4 in. (100 mm)
or more
20 in. (500 mm)
or more *2
*2 When any 2 sides of left, right
and rear of the unit are clear
MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA
MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA
OBH733J

9
5WIRING DIAGRAM
MUZ-GL09NA-
U1
,
U8 MUZ-GL12NA- U1
MUZ-GL09NA-
U2 MUZ-GL12NA- U2
OBH733J

10
MUZ-GL09NAH-
U2 MUZ-GL12NAH- U2
MUZ-GL09NAH-
U1
,
U8 MUZ-GL12NAH- U1
OBH733J