Mitsubishi Electric MUZ-HM09NA-U2 User manual

Models
MUZ-HM09NA -U1 , U2 , U8 MUZ-HM18NA -U1 , U2
MUZ-HM09NA2 -U1 , U8 MUZ-HM18NA2 -U1
MUZ-HM09NAH -U1 MUZ-HM18NAH -U1
MUZ-HM12NA -U1 , U2 , U8 MUZ-HM24NA -U1
MUZ-HM12NA2 -U1 , U8 MUZ-HM24NA2 -U1
MUZ-HM12NAH -U1 MUZ-HM24NAH -U1
MUZ-HM15NA -U1 , U2
MUZ-HM15NA2 -U1
MUZ-HM15NAH -U1
HFC
utilized
R410A
MUZ-HM24NA
PARTS CATALOG (OBB747)
SERVICE MANUAL
No. OBH747
REVISED EDITION-F
Indoor unit service manual
MSZ-HM•NA Series (OBH746)
CONTENTS
1. TECHNICAL CHANGES ······························3
2. PART NAMES AND FUNCTIONS··················3
3. SPECIFICATION ········································4
4. OUTLINES AND DIMENSIONS·····················9
5. WIRING DIAGRAM··································· 11
6. REFRIGERANT SYSTEM DIAGRAM ··········· 16
7. DATA······················································ 20
8. ACTUATOR CONTROL ····························· 33
9. SERVICE FUNCTIONS······························ 34
10. TROUBLESHOOTING ······························· 35
11. DISASSEMBLY INSTRUCTIONS················· 60
OBH747 REVISED EDITION-E is void.
OUTDOOR UNIT
Revision F:
• 1. TECHNICAL CHANGES for MUZ-HM09/12/15/18NA- U2 have
been corrected.
• Power consumptions for MUZ-HM15/18/24NA, MUZ-
HM15/18/24NA2, MUZ-HM15/18/24NAH in 3. SPECIFICATION
have been corrected.
• Air flow and fan speed in 3.SPECIFICATION have been corrected.
• 5. WIRING DIAGRAM for MUZ-HM09/12/15/18NA- U2 have been
corrected.
• Some descriptions have been modified.

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-HM09/12NA- U8 , MUZ-HM09/12NA2- U8 , MUZ-HM15/18NA- U1 , MUZ-HM15/18NA2- U1 and MUZ-HM24NA2- U1
have been added.
Revision B:
• 3. SPECIFICATION has been modified.
Revision C:
• MUZ-HM09/12NA-U1 , MUZ-HM09/12NA2-U1 have been added.
Revision D:
• Capacity corrections have been corrected [7-1. 2), 3)].
Revision E:
• MUZ-HM09/12/15/18NA- U2 and MUZ-HM09/12/15/18/24NAH- U1 have been added.
Revision F:
• 1. TECHNICAL CHANGES for MUZ-HM09/12/15/18NA- U2 have been corrected.
• Power consumptions for MUZ-HM15/18/24NA, MUZ-HM15/18/24NA2, MUZ-HM15/18/24NAH in 3. SPECIFICATION have
been corrected.
• Air flow and fan speed in 3.SPECIFICATION have been corrected.
• 5. WIRING DIAGRAM for MUZ-HM09/12/15/18NA- U2 have been corrected.
• Some descriptions have been modified.
OBH747F

3
TECHNICAL CHANGES
1
2PART NAMES AND FUNCTIONS
MUZ-HM24NA - U1
1. New model
MUZ-HM09NA - U8
MUZ-HM09NA2 - U8
MUZ-HM12NA - U8
MUZ-HM12NA2 - U8
MUZ-HM15NA - U1
MUZ-HM15NA2 - U1
MUZ-HM18NA - U1
MUZ-HM18NA2 - U1
MUZ-HM24NA2 - U1
1. New model
MUZ-HM09NA - U1
MUZ-HM09NA2 - U1
MUZ-HM12NA - U1
MUZ-HM12NA2 - U1
1. New model
MUZ-HM09NA - U1 MUZ-HM09NA - U2
MUZ-HM12NA - U1 MUZ-HM12NA - U2
1. Fan motor has been changed.
2. Inverter P.C. board has been changed.
3. R.V. coil has been changed.
4. LEV has been changed.
5. Outdoor heat exchanger has been changed.
6. 4-way valve has been changed.
7. Compressor has been changed.
MUZ-HM15NA - U1 MUZ-HM15NA - U2
MUZ-HM18NA - U1 MUZ-HM18NA - U2
1. Fan motor has been changed.
2. Inverter P.C. board has been changed.
3. LEV has been changed.
MUZ-HM09NAH - U1
MUZ-HM12NAH - U1
MUZ-HM15NAH - U1
MUZ-HM18NAH - U1
MUZ-HM24NAH - U1
1. New model
MUZ-HM24NA MUZ-HM24NA2 MUZ-HM24NAH
Piping
Air outlet
Drain outlet
Air inlet
(back and side)
Drain hose
MUZ-HM09NA MUZ-HM09NA2 MUZ-HM09NAH
MUZ-HM12NA MUZ-HM12NA2 MUZ-HM12NAH
MUZ-HM15NA MUZ-HM15NA2 MUZ-HM15NAH
MUZ-HM18NA MUZ-HM18NA2 MUZ-HM18NAH
Air outlet
Drain outlet
Piping
Drain hose
Air inlet
(back and side)
OBH747F

4
3SPECIFICATION
Outdoor unit model MUZ-HM09NA - U1
MUZ-HM09NA2 - U1
MUZ-HM09NA - U2
MUZ-HM09NAH - U1
MUZ-HM09NA - U8
MUZ-HM09NA2 - U8
Capacity
Rated (Minimum~Maximum)
Cooling 1 Btu/h 9,000 ( 3,800 ~ 10,000 )
Heating 47 1 Btu/h 10,900 ( 4,500 ~ 11,800 )
Capacity
Rated (Maximum) Heating 17 2 Btu/h 6,700 (7,200)
Power consumption
Rated (Minimum~Maximum)
Cooling 1 W 750 (240 - 850) 750 (205 - 850)
Heating 47 1 W 900 (240 - 1,000) 900 (255 - 1,000)
Power consumption
Rated (Maximum) Heating 17 2 W 700 (780)
EER 1 [SEER] 3Cooling 12.0 [ 18.0 ]
HSPF IV 4Heating 10.0 (NA)/8.5 (NA2)/9.0 (NAH)
COP Heating 13.55
Power factor Cooling (208/230) % 87/87 84/84
Heating (208/230) % 90/90 90/89
Power supply V , phase , Hz 208/230 , 1 , 60
Max. fuse size (time delay) A 15
Min. circuit ampacity A 9 12
Fan motor F.L.A A 0.50
Compressor
Model KNB073FRVMC KNB073FRXMC KNB073FQDHC
R.L.A A 6.2 6.6
L.R.A A 7.7 8.2
Refrigeration oil
 oz. (L) (Model) 9.1 (0.27) (FV50S) 10.8 (0.32) (NEO22)
Refrigerant control Linear expansion valve
Sound level 1Cooling dB(A) 46
Heating dB(A) 50
Airow
High - Med. - Low
Cooling CFM 1,063 - 1,063 - 1,063
Heating CFM 1,282 - 1,105 - 1,105 1,240 - 1,105 - 1,105
Fan speed
High - Med. - Low
Cooling rpm 740 -740 -740
Heating rpm 890 - 770- 770 860 - 770 - 770
Defrost method Reverse cycle
Dimensions
W in. 31-1/2
D in. 11-1/4
H in. 21-5/8
Weight Ib. 73
External nish Munsell 3Y 7.8/1.1
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 difference ft. 40
Piping length ft. 65
Refrigerant charge (R410A) 1 lb. 12 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 3-1.)
4: Test condition (Refer to 3-1.)
OBH747F

5
Outdoor unit model MUZ-HM12NA - U1
MUZ-HM12NA2 - U1
MUZ-HM12NA - U2
MUZ-HM12NAH - U1
MUZ-HM12NA - U8
MUZ-HM12NA2 - U8
Capacity
Rated (Minimum~Maximum)
Cooling 1 Btu/h 12,000 ( 3,800 ~ 12,200 )
Heating 47 1 Btu/h 12,200 ( 4,500 ~ 14,500 )
12,200 ( 5,500 ~ 14,500 )
Capacity
Rated (Maximum) Heating 17 2 Btu/h 7,600 (9,000)
Power consumption
Rated (Minimum~Maximum)
Cooling 1 W 1,210 (240 - 1,300) 1,210 (205 - 1,300)
Heating 47 1 W 990 (240 - 1,220) 990 (340 - 1,660)
Power consumption
Rated (Maximum) Heating 17 2 W 800 (990)
EER 1 [SEER] 3Cooling 9.9 [ 18.0 ]
HSPF IV 4Heating 10.0 (NA)/8.5 (NA2)/9.0 (NAH)
COP Heating 13.61
Power factor Cooling (208/230) % 95/95 94/94
Heating (208/230) % 93/93 95/96
Power supply V , phase , Hz 208/230 , 1 , 60
Max. fuse size (time delay) A 15
Min. circuit ampacity A 9 12
Fan motor F.L.A A 0.50
Compressor
Model KNB073FRVMC
KNB073FRXMC KNB092FQAHC
R.L.A A 6.2 6.6
L.R.A A 7.7 8.2
Refrigeration oil
 oz. (L) (Model) 9.1 (0.27) (FV50S) 10.8 (0.32) (NEO22)
Refrigerant control Linear expansion valve
Sound level 1Cooling dB(A) 49
Heating dB(A) 51
Airow
High - Med. - Low
Cooling CFM 1,063 - 1,063 - 1,063 1,102 - 1,102 - 639
Heating CFM 1,282 - 1,105 - 1,105 1,186 - 1,116 - 1,045
Fan speed
High - Med. - Low
Cooling rpm 740- 740 -740 810 - 810 - 490
Heating rpm 890 - 770 - 770 870 - 820 - 770
Defrost method Reverse cycle
Dimensions
W in. 31-1/2
D in. 11-1/4
H in. 21-5/8
Weight Ib. 73
External nish Munsell 3Y 7.8/1.1
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 difference ft. 40
Piping length ft. 65
Refrigerant charge (R410A) 1 lb. 12 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 3-1.)
4: Test condition (Refer to 3-1.)
OBH747F

6
Outdoor unit model
MUZ-HM15NA
MUZ-HM15NA2
MUZ-HM15NAH
MUZ-HM18NA
MUZ-HM18NA2
MUZ-HM18NAH
Capacity
Rated (Minimum~Maximum)
Cooling 1 Btu/h 14,000 (3,100 - 16,000) 17,200 (5,800 - 18,000)
Heating 47 1 Btu/h 18,000 (4,800 - 18,500) 18,000 (5,400 - 20,900)
Capacity
Rated (Maximum) Heating 17 2 Btu/h 11,500 (14,000) 11,500 (15,000)
Power consumption
Rated (Minimum~Maximum)
Cooling 1 W 1,170 (230 - 2,000) 1,640 (350 - 2,070)
Heating 47 1 W 1,600 (220 - 2,010) 1,590 (330 - 2,250)
Power consumption
Rated (Maximum) Heating 17 2 W 1,300 (1,850) 1,300 (1,950)
EER 1 [SEER] 3Cooling 12.0 [18.0] 10.5 [18.0]
HSPF IV 4Heating 10.0 [NA] / 8.5 [NA2] / 9.0 [NAH]
COP Heating 13.30 3.32
Power factor Cooling (208/230) % 98/98 98/98
Heating (208/230) % 98/98 97/97
Power supply V , phase , Hz 208/230, 1 , 60 208/230, 1 , 60
Max. fuse size (time delay) A 15 15
Min. circuit ampacity A 10 10
Fan motor F.L.A A 0.50 0.50
Compressor
Model SNB130FQBMT SNB130FQBMT
R.L.A A 7.4 7.4
L.R.A A 9.3 9.3
Refrigeration oil
 oz. (L) (Model) 11.8 (0.35) (FV50S) 11.8 (0.35) (FV50S)
Refrigerant control Linear expansion valve
Sound level 1Cooling dB(A) 49 49
Heating dB(A) 51 51
Airow
High - Med. - Low
Cooling CFM 1,102 - 1,102 - 639 1,102 - 1,102 - 639
Heating CFM 1,186 - 1,045 - 1,045 1,186 - 1,045 - 1,045
Fan speed
High - Med. - Low
Cooling rpm 810 - 810 - 490 810 - 810 - 490
Heating rpm 870 - 770 - 770 870 - 770 - 770
Defrost method Reverse cycle
Dimensions
W in. 31-1/2 31-1/2
D in. 11-1/4 11-1/4
H in. 21-5/8 21-5/8
Weight Ib. 81 81
External nish Munsell 3Y 7.8/1.1
Refrigerant piping Not supplied
Refrigerant pipe size
(Min. wall thickness)
Liquid in. 1/4 (0.0315) 1/4 (0.0315)
Gas in. 1/2 (0.0315) 1/2 (0.0315)
Connection method Indoor Flared Flared
Outdoor Flared Flared
Between the indoor &
outdoor units
Height difference ft. 40 40
Piping length ft. 65 65
Refrigerant charge (R410A) 2 lb. 9 oz. 2 lb. 10 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 3-1.)
4: Test condition (Refer to 3-1.)
OBH747F

7
Outdoor unit model
MUZ-HM24NA
MUZ-HM24NA2
MUZ-HM24NAH
Capacity
Rated (Minimum~Maximum)
Cooling 1 Btu/h 22,500 (5,800 ~ 22,500)
Heating 47 1 Btu/h 26,000 (5,400 ~ 26,000)
Capacity
Rated (Maximum) Heating 17 2 Btu/h 18,500 (18,500)
Power consumption
Rated (Minimum~Maximum)
Cooling 1 W 2,630 (330 - 2,630)
Heating 47 1 W 2,500 (320 - 2,500)
Power consumption
Rated (Maximum) Heating 17 2 W 2,300 (2,300)
EER 1 [SEER] 3 Cooling 8.6 [18.0]
HSPF IV 4 Heating 9.5 [NA] / 8.5 [NA2] / 9.0 [NAH]
COP Heating 1 3.05
Power factor Cooling (208/230) % 99/99
Heating (208/230) % 99/99
Power supply V , phase , Hz 208/230, 1 , 60
Max. fuse size (time delay) A 15
Min. circuit ampacity A 14
Fan motor F.L.A 0.93
Compressor
Model SNB130FQBMT
R.L.A 10
L.R.A 12.5
Refrigeration oil
 oz. (L) (Model) 11.8 (0.35) (FV50S)
Refrigerant control Linear expansion valve
Sound level 1Cooling dB(A) 54
Heating dB(A) 55
Airow
High - Med. - Low
COOL CFM 1,742 - 1,742 - 922
HEAT CFM 1,691 - 1,691 - 1,372
Fan speed
High - Med. - Low
Cooling rpm 840 - 840 - 450
Heating rpm 810 - 810 - 650
Defrost method Reverse cycle
Dimensions
W in. 33-1/16
D in. 13
H in. 34-5/8
Weight Ib. 121
External nish Munsell 3Y 7.8/1.1
Refrigerant piping Not supplied
Refrigerant pipe size
(Min. wall thickness)
Liquid in. 3/8 (0.0315)
Gas in. 5/8 (0.0315)
Connection method Indoor Flared
Outdoor Flared
Between the indoor &
outdoor units
Height difference ft. 50
Piping length ft. 100
Refrigerant charge (R410A) 3 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
OBH747F

8
3-1. 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
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 (NA/NAH), 5(NA2) -5 (NA/NAH), 4 (NA2)
3-2. 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
OBH747F

9
OUTLINES AND DIMENSIONS
4
Unit: inch
(HM09/12/15/18NA/NA2)
(HM09/12/15/18NAH)
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
Liquid refrigerant pipe joint
Refrigerant pipe (flared) Ø 1/4
Gas refrigerant pipe joint
Refrigerant pipe (flared) Ø 3/8 (HM09/12)
Ø
1/2 (HM15/18)
REQUIRED SPACE
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
MUZ-HM09NA MUZ-HM09NA2 MUZ-HM09NAH MUZ-HM12NA MUZ-HM12NA2 MUZ-HM12NAH
MUZ-HM15NA MUZ-HM15NA2 MUZ-HM15NAH MUZ-HM18NA MUZ-HM18NA2 MUZ-HM18NAH
OBH747F

10
MUZ-HM24NA MUZ-HM24NA2 MUZ-HM24NAH 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 3/8
Gas refrigerant pipe joint
Refrigerant pipe (flared) Ø 5/8
*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
OBH747F