Mitsubishi Electric MUZ-FH18NA User manual

SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ··································· 2
2. PART NAMES AND FUNCTIONS····················· 3
3. SPECIFICATION················································ 4
4. OUTLINES AND DIMENSIONS ························ 6
5. WIRING DIAGRAM············································ 8
6. REFRIGERANT SYSTEM DIAGRAM ··············11
7. DATA································································ 13
8. ACTUATOR CONTROL··································· 21
9. SERVICE FUNCTIONS ··································· 22
10. TROUBLESHOOTING····································· 23
11. DISASSEMBLY INSTRUCTIONS···················· 44
Models
SPLIT-TYPE AIR CONDITIONERS
OUTDOOR UNIT
Indoor unit service manual
MSZ-FH•NA Series (OBH683)
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
HFC
utilized
R410A
No. OBH684
REVISED EDITION-B
PARTS CATALOG (OBB684)
MUZ-FH09NA
MUZ-FH12NA
MUZ-FH09NAH
MUZ-FH12NAH
Please void OBH684 REVISED EDITION-A.
Revision B:
• MUZ-FH18NA and MUZ-FH18NAH have been
added.
MUZ-FH09NA
MUZ-FH12NA
MUZ-FH15NA
MUZ-FH18NA
MUZ-FH09NAH
MUZ-FH12NAH
MUZ-FH15NAH
MUZ-FH18NAH

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1TECHNICAL CHANGES
MUZ-FH09NA MUZ-FH09NAH
MUZ-FH12NA MUZ-FH12NAH
MUZ-FH15NA MUZ-FH15NAH
1. New model
MUZ-FH18NA MUZ-FH18NAH
1. New model
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.
Revision A:
• 3. SPECIFICATION has been modified.
(The values of COP have been modified.)
• 10. TROUBLESHOOTING has been modified.
Revision B:
• MUZ-FH18NA and MUZ-FH18NAH have been added.
OBH684B

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MUZ-FH09NA MUZ-FH12NA
MUZ-FH09NAH MUZ-FH12NAH
MUZ-FH15NA MUZ-FH15NAH
MUZ-FH18NA MUZ-FH18NAH
Piping
Air outlet
Drain outlet
Air inlet
(back and side)
Drain hose
PART NAMES AND FUNCTIONS
2
Air outlet
Drain outlet
Piping
Drain hose
Air inlet
(back and side)
OBH684B

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3SPECIFICATION
Outdoor unit model MUZ-FH09NA
MUZ-FH09NAH
MUZ-FH12NA
MUZ-FH12NAH
MUZ-FH15NA
MUZ-FH15NAH
MUZ-FH18NA
MUZ-FH18NAH
Capacity
Rated (Minimum~Maximum)
Cooling 1 Btu/h
9,000 (1,700 ~ 12,000) 12,000 (2,500 ~ 13,600) 15,000 (6,450 ~ 19,000) 17,200 (6,450 ~ 21,000)
Heating 47 1 Btu/h
10,900 (1,600 ~ 18,000) 13,600 (3,700 ~ 21,000) 18,000 (5,150 ~ 24,000) 20,300 (5,150 ~ 30,000)
Capacity
Rated (Maximum) Heating 17 2 Btu/h
6,700 (12,200) 8,000(13,600) 11,000 (18,000) 13,700 (20,300)
Power consumption
Rated (Minimum~Maximum)
Cooling 1 W
560 (100 ~ 1,000) 870 (170 ~ 1,150) 1,200 (410 ~ 2,200) 1,430 (410 ~ 2,220)
Heating 47 1 W
710 (110 ~ 1,470) 950 (280 ~ 2,300) 1,300 (430 ~ 3,360) 1,720 (430 ~ 3,390)
Power consumption
Rated (Maximum) Heating 17 2 W 600 (1,440) 720 (1,900) 1,020 (2,480) 1,320 (3,180)
EER 1 [SEER] 3 Cooling 16.1 [30.5] 13.8 [26.1] 12.5 [22.0] 12.0 [21.0]
HSPF IV 4Heating NA: 13.5 NA: 12.5 NA: 12.0 NA: 12.0
NAH: 12.5 NAH: 11.5 NAH: 11.0 NAH: 11.0
COP Heating 1 4.50 4.20 4.06 3.46
Power supply V , phase , Hz 208/230, 1 , 60
Max. fuse size (time delay) A 15 20
Min. circuit ampacity A 11 16
Fan motor F.L.A 0.50 0.93
Compressor
Model SNB092FQAMT SNB140FQUMT SNB172FQKMT
R.L.A 8.2 12.0
L.R.A 10.3 15.0
Refrigeration oil L (Model) 0.35 (FV50S) 0.35 (FV50S) 0.40 (FV50S)
Refrigerant control Linear expansion valve
Sound level 1Cooling dB(A) 48 49 51 52
Heating dB(A) 49 51 55 55
Defrost method 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 83 124
External finish Munsell 3Y 7.8/1.1
Remote controller Wireless type
Control voltage
(by built-in transformer) VDC 12 - 24
Refrigerant piping Not supplied
Refrigerant pipe size
(Min. wall thickness)
Liquid in. 1/4 (0.0315)
Gas in. 3/8 (0.0315) 1/2 (0.0315)
Connection method Indoor Flared
Outdoor Flared
Between the indoor
& outdoor units
Height difference ft. 40 50
Piping length ft. 65 100
Refrigerant charge (R410A) 2 lb. 9 oz. 3 lb. 7 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
OBH684B

5
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
= ("Cooling 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 -13 -14
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
OBH684B

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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
REQUIRED SPACE
Liquid refrigerant pipe joint
Refrigerant pipe (flared) Ø 1/4
Gas refrigerant pipe joint
Refrigerant pipe (flared) Ø 3/8
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
OUTLINES AND DIMENSIONS
4
Unit: inch
MUZ-FH09NA MUZ-FH09NAH MUZ-FH12NA MUZ-FH12NAH
OBH684B

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MUZ-FH15NA MUZ-FH15NAH MUZ-FH18NA MUZ-FH18NAH Unit: inch
16-7/16
1-9/16
1-5/8
Drain hole
6-7/8 19-11/16
13
2
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
Gas refrigerant pipe joint
Refrigerant pipe (flared) Ø 1/2
*1 20 in. (500 mm) or more when front
and sides of the unit are clear
14in. (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
OBH684B

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5WIRING DIAGRAM
MUZ-FH09NA MUZ-FH12NA
MUZ-FH09NAH MUZ-FH12NAH
OBH684B

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MUZ-FH15NA MUZ-FH18NA
OBH684B

10
MUZ-FH15NAH MUZ-FH18NAH
OBH684B