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

2
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

3
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

4
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

6
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

7
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

9
MUZ-FH15NA MUZ-FH18NA
OBH684B

10
MUZ-FH15NAH MUZ-FH18NAH
OBH684B

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6REFRIGERANT SYSTEM DIAGRAM
Unit: inch
MUZ-FH09NA MUZ-FH09NAH MUZ-FH12NA MUZ-FH12NAH
Outdoor
heat
exchanger
Flared connection
Defrost
thermistor
RT61
Discharge
temperature
thermistor
RT62
Flared connection
Stop valve
(with strainar)
Stop valve
Refrigerant flow in cooling
Compressor
4-way valve
Refrigerant flow in heating
Refrigerant pipe ø3/8
(with heat insulator)
Refrigerant pipe ø1/4
(with heat insulator)
R.V. coil
heating ON
cooling OFF
Strainer
#100
LEV
Ambient
temperature
thermistor
RT65
Muffler
Capillary tube
O.D. 0.157 ×
I.D. 0.094 × 9-7/16
( ø4.0 × ø2.4 × 240 )
Outdoor heat
exchanger
temperature
thermistor
RT68
Capillary tube
O.D. 0.118 ×
I.D. 0.079 × 8-9/32
(ø3.0 × ø2.0 × 210)
Service
port
Service
port
Muffler
MUZ-FH15NA MUZ-FH15NAH MUZ-FH18NA MUZ-FH18NAH
Outdoor
heat
exchanger
Flared connection
Defrost
thermistor
RT61
Discharge
temperature
thermistor
RT62
Flared connection
Stop valve
Stop valve
Capillary tube
O.D. 0.157 ×
I.D. 0.094× 3-15/16
(ø4.0×ø2.4×100)
Refrigerant flow in cooling
Compressor
Service port
4-way valve
Refrigerant flow in heating
Refrigerant pipe
ø 1/2
(with heat insulator)
Refrigerant pipe ø 1/4
(with heat insulator)
LEV
Muffler
R.V. coil
heating ON
cooling OFF
Muffler
#100
Strainer
#100
Outdoor heat
exchanger
temperature
thermistor
RT68
Ambient
temperature
thermistor
RT65
Strainer
#100
Service
port
OBH684B

12
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-FH09NA
MUZ-FH09NAH
MUZ-FH12NA
MUZ-FH12NAH
65 40 3/8 1/4
MUZ-FH15NA
MUZ-FH15NAH
MUZ-FH18NA
MUZ-FH18NAH
100 50 1/2 1/4
ADDITIONAL REFRIGERANT CHARGE (R410A: oz.)
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 65
MUZ-FH09NA
MUZ-FH09NAH 2 lb. 9 oz. 0 1.08 3.24 5.40 7.56 8.64
Calculation: X oz. = 1.08/5 oz./ft. × (Refrigerant piping length (ft.) - 25)
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 65
MUZ-FH12NA
MUZ-FH12NAH 2 lb. 9 oz. 0 1.62 4.86 8.10 11.34 12.96
Calculation: X oz. = 1.62/5 oz./ft. × (Refrigerant piping length (ft.) - 25)
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-FH15NA
MUZ-FH15NAH
MUZ-FH18NA
MUZ-FH18NAH
3 lb. 7 oz. 0 1.08 3.24 5.40 7.56 9.72 11.88 14.04 16.20
Calculation: X oz. = 1.08/5 oz./ft. × (Refrigerant piping length (ft.) - 25)
OBH684B

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DATA7
MUZ-FH09NA MUZ-FH09NAH MUZ-FH12NA MUZ-FH12NAH
MUZ-FH15NA MUZ-FH15NAH MUZ-FH18NA MUZ-FH18NAH
7-1. PERFORMANCE DATA
1) COOLING CAPACITY
Model
Indoor air Outdoor intake air DB temperature (˚F)
IWB (˚F) 75 85 95 105 115
TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC
MUZ-FH09NA
MUZ-FH09NAH
71 11.0 8.7 0.50 10.3 8.1 0.55 9.7 7.6 0.59 9.0 7.1 0.62 8.3 6.5 0.64
67 10.4 9.6 0.47 9.7 8.9 0.52 9.0 8.3 0.56 8.4 7.7 0.59 7.7 7.1 0.62
63 9.8 10.3 0.45 9.1 9.6 0.50 8.5 8.9 0.53 7.7 8.1 0.57 7.0 7.4 0.59
MUZ-FH12NA
MUZ-FH12NAH
71 14.7 10.2 0.77 13.7 9.6 0.85 12.9 9.0 0.91 12.0 8.4 0.96 11.0 7.7 1.00
67 13.9 11.6 0.73 13.0 10.8 0.80 12.0 10.0 0.87 11.2 9.3 0.92 10.3 8.5 0.97
63 13.1 12.6 0.70 12.1 11.7 0.77 11.3 10.9 0.83 10.3 9.9 0.89 9.4 9.0 0.92
MUZ-FH15NA
MUZ-FH15NAH
71 18.4 10.4 1.07 17.2 9.7 1.17 16.1 9.1 1.26 15.0 8.5 1.33 13.8 7.8 1.38
67 17.4 12.2 1.01 16.2 11.3 1.11 15.0 10.5 1.20 14.0 9.8 1.27 12.8 9.0 1.33
63 16.4 13.6 0.96 15.2 12.6 1.06 14.1 11.8 1.15 12.8 10.7 1.22 11.7 9.8 1.27
MUZ-FH18NA
MUZ-FH18NAH
71 21.1 11.3 1.27 19.7 10.6 1.39 18.5 9.9 1.50 17.2 9.2 1.58 15.8 8.5 1.64
67 20.0 13.4 1.20 18.6 12.4 1.32 17.2 11.5 1.43 16.0 10.7 1.52 14.7 9.9 1.59
63 18.7 15.1 1.14 17.4 14.0 1.27 16.2 13.0 1.37 14.7 11.8 1.46 13.4 10.8 1.52
NOTE: 1. IWB : Intake air wet-bulb temperature TC : Total Capacity (x103Btu/h)
SHC : Sensible Heat Capacity (x103Btu/h) TPC : Total Power Consumption (kW)
2. SHC is based on 80˚F of indoor Intake air DB temperature.
2) COOLING CAPACITY CORRECTIONS
Refrigerant piping length (one way: ft.)
25 (std.) 40 65 100
MUZ-FH09NA
MUZ-FH09NAH
MUZ-FH12NA
MUZ-FH12NAH
1.0 0.954 0.878 -
MUZ-FH15NA
MUZ-FH15NAH
MUZ-FH18NA
MUZ-FH18NAH
1.0 0.954 0.878 0.771
OBH684B

14
3) HEATING CAPACITY
Model
Indoor air Outdoor intake air WB temperature (˚F)
IDB (˚F) 5 152535434555
TC TPC TC TPC TC TPC TC TPC TC TPC TC TPC TC TPC
MUZ-FH09NA
75 4.8 0.42 6.3 0.53 7.9 0.62 9.4 0.69 10.6 0.73 11.0 0.74 12.4 0.77
70 5.2 0.40 6.7 0.51 8.2 0.61 9.6 0.67 10.9 0.71 11.2 0.72 12.7 0.75
65 5.5 0.38 6.9 0.49 8.6 0.59 10.0 0.66 11.2 0.69 11.6 0.70 13.0 0.74
MUZ-FH09NAH
75 4.8 0.55 6.3 0.66 7.9 0.75 9.4 0.69 10.6 0.73 11.0 0.74 12.4 0.77
70 5.2 0.53 6.7 0.64 8.2 0.74 9.6 0.67 10.9 0.71 11.2 0.72 12.7 0.75
65 5.5 0.51 6.9 0.62 8.6 0.72 10.0 0.66 11.2 0.69 11.6 0.70 13.0 0.74
MUZ-FH12NA
75 6.0 0.56 7.9 0.71 9.9 0.83 11.8 0.93 13.3 0.97 13.7 0.99 15.5 1.03
70 6.5 0.54 8.4 0.68 10.2 0.81 12.0 0.90 13.6 0.95 14.0 0.97 15.8 1.01
65 6.8 0.51 8.6 0.66 10.7 0.78 12.4 0.88 14.0 0.93 14.4 0.94 16.2 0.99
MUZ-FH12NAH
75 6.0 0.69 7.9 0.84 9.9 0.96 11.8 0.93 13.3 0.97 13.7 0.99 15.5 1.03
70 6.5 0.67 8.4 0.81 10.2 0.94 12.0 0.90 13.6 0.95 14.0 0.97 15.8 1.01
65 6.8 0.64 8.6 0.79 10.7 0.91 12.4 0.88 14.0 0.93 14.4 0.94 16.2 0.99
MUZ-FH15NA
75 7.9 0.77 10.4 0.97 13.1 1.14 15.6 1.27 17.6 1.33 18.1 1.35 20.5 1.40
70 8.6 0.73 11.1 0.94 13.5 1.11 15.9 1.24 18.0 1.30 18.5 1.33 21.0 1.38
65 9.0 0.70 11.3 0.90 14.1 1.07 16.5 1.20 18.5 1.27 19.1 1.29 21.4 1.35
MUZ-FH15NAH
75 7.9 0.90 10.4 1.10 13.1 1.27 15.6 1.27 17.6 1.33 18.1 1.35 20.5 1.40
70 8.6 0.86 11.1 1.07 13.5 1.24 15.9 1.24 18.0 1.30 18.5 1.33 21.0 1.38
65 9.0 0.83 11.3 1.03 14.1 1.20 16.5 1.20 18.5 1.27 19.1 1.29 21.4 1.35
MUZ-FH18NA
75 8.9 1.01 11.8 1.28 14.7 1.51 17.6 1.68 19.8 1.76 20.4 1.79 23.1 1.86
70 9.6 0.97 12.5 1.24 15.2 1.47 18.0 1.63 20.3 1.72 20.9 1.75 23.6 1.82
65 10.2 0.93 12.8 1.19 15.9 1.42 18.6 1.59 20.9 1.68 21.5 1.70 24.2 1.79
MUZ-FH18NAH
75 8.9 1.14 11.8 1.41 14.7 1.64 17.6 1.68 19.8 1.76 20.4 1.79 23.1 1.86
70 9.6 1.10 12.5 1.37 15.2 1.60 18.0 1.63 20.3 1.72 20.9 1.75 23.6 1.82
65 10.2 1.06 12.8 1.32 15.9 1.55 18.6 1.59 20.9 1.68 21.5 1.70 24.2 1.79
NOTE: 1. IDB : Intake air dry-bulb temperature
TC : Total Capacity (x103Btu/h) TPC : Total Power Consumption (kW)
2. Above data is for heating operation without any frost.
How to operate with fixed operational frequency of the compressor.
1. Press the EMERGENCY OPERATION switch on the front of the indoor unit, and select either EMERGENCY COOL
mode or EMERGENCY HEAT mode before starting to operate the air conditioner.
2. The compressor starts with operational frequency.
3. The fan speed of the indoor unit is High.
4. This operation continues for 30 minutes.
5. In order to release this operation, press the EMERGENCY OPERATION switch twice or once, or press any button on
the remote controller.
OBH684B

15
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.
71
67
63
65 75 85 95 105 115
0.4
0.5
0.6
0.7
0.8
Indoor intake air WB temperature (°F)
SHF at rating condition = 0.92
= 381 CFM
Airflow
Outdoor intake air DB temperature (°F)
Total power consumption
(kW)
71
67
63
65 75 85 95 105 115
0.6
0.7
0.8
0.9
1.0
1.1
Indoor intake air WB temperature (°F)
SHF at rating condition = 0.83
= 398 CFM
Airflow
Outdoor intake air DB temperature (°F)
Total power consumption
(kW)
MUZ-FH09NA MUZ-FH09NAH MUZ-FH12NA MUZ-FH12NAH
MUZ-FH15NA MUZ-FH15NAH
Cooling capacity ( at Rated frequency)
0.9
1.0
1.1
1.2
1.3
1.4
1.5
14 23 32 41 50 59 68 77 86 95 104 113
Outdoor intake air DB temperature(°F)
Capacity correction factors
76
75
68
64
72
Indoor intake air Wet-bulb
temperature( F)
Indoor air Wet-bulb temperature
difference (°F)
71
67
63
65 75 85 95 105 115
0.9
1.0
1.1
1.2
1.3
1.4
Indoor intake air WB temperature (°F)
SHF at rating condition = 0.7
= 411 CFM
Airflow
Outdoor intake air DB temperature (°F)
Total power consumption
(kW)
MUZ-FH18NA MUZ-FH18NAH
71
67
63
65 75 85 95 105 115
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
Indoor intake air WB temperature (°F)
SHF at rating condition = 0.67
= 437 CFM
Airflow
Outdoor intake air DB temperature (°F)
Total power consumption
(kW)
OBH684B

16
65
70
75
-5 5 152535455565
0.2
0.4
0.6
0.8
Indoor intake air DB temperature (°F)
= 437 CFM
Airflow
Outdoor intake air WB temperature (°F)
Total power consumption
(kW)
65
70
75
-5 5 152535455565
0.3
0.6
0.9
1.2
Indoor intake air DB temperature (°F)
= 454 CFM
Airflow
Outdoor intake air WB temperature (°F)
Total power consumption
(kW)
Heating
MUZ-FH15NA
MUZ-FH18NA
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.
Indoor air Dry-bulb temperature
difference (°F)
Outdoor intake air WB temperature (°F)
-4 5 142332415059
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)
65
70
75
-5 5 152535455565
0.50
0.75
1.00
1.25
1.50
Indoor intake air DB temperature (°F)
= 454 CFM
Airflow
Outdoor intake air WB temperature (°F)
Total power consumption
(kW)
65
70
75
-5 5 152535455565
0.50
0.75
1.00
1.25
1.50
1.75
2.00
Indoor intake air DB temperature (°F)
= 514 CFM
Airflow
Outdoor intake air WB temperature (°F)
Total power consumption
(kW)
MUZ-FH09NA
MUZ-FH12NA
65
70
75
-5 5 152535455565
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Indoor intake air DB temperature (°F)
= 437 CFM
Airflow
Outdoor intake air WB temperature (°F)
Total power consumption
(kW)
65
70
75
-5 5 152535455565
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
Indoor intake air DB temperature (°F)
= 454 CFM
Airflow
Outdoor intake air WB temperature (°F)
Total power consumption
(kW)
MUZ-FH09NAH
MUZ-FH12NAH
MUZ-FH15NAH
MUZ-FH18NAH
65
70
75
-5 5 152535455565
0.5
0.7
0.9
1.1
1.3
1.5
Indoor intake air DB temperature (°F)
= 497 CFM
Airflow
Outdoor intake air WB temperature (°F)
Total power consumption
(kW)
65
70
75
-5 5 152535455565
0.75
1.00
1.25
1.50
1.75
2.00
Indoor intake air DB temperature (°F)
= 514 CFM
Airflow
Outdoor intake air WB temperature (°F)
Total power consumption
(kW)
OBH684B

17
7-3. CONDENSING PRESSURE
Cooling
Data are based on the condition of indoor humidity 50 %.
Air flow should be set to High speed.
MUZ-FH12NA MUZ-FH12NAH
65 70 75 80 85 90 95 100 105
200
250
300
350
400
450
500
(°F) (°F)
65 70 75 80 85 90 95 100 105
80
100
120
140
160
180
(PSIG)
Condensing pressure
Suction pressure
Outdoor ambient temperature
Indoor DB temperature (°F)
(PSIG)
Indoor DB temperature (°F)
Outdoor ambient temperature
86
80
75
70
86
80
75
70
MUZ-FH09NA MUZ-FH09NAH
65 70 75 80 85 90 95 100 105
200
250
300
350
400
450
500
(°F) (°F)
60 65 70 75 80 85 90 95 100 105
90
110
130
150
170
190
(PSIG)
Condensing pressure
Suction pressure
Outdoor ambient temperature
Indoor DB temperature (°F)
(PSIG)
Indoor DB temperature (°F)
Outdoor ambient temperature
86
80
75
70
86
80
75
70
MUZ-FH15NA MUZ-FH15NAH
MUZ-FH18NA MUZ-FH18NAH
65 70 75 80 85 90 95 100 105
200
250
300
350
400
450
500
(°F) (°F)
65 70 75 80 85 90 95 100 105
80
100
120
140
160
180
(PSIG)
Condensing pressure
Suction pressure
Outdoor ambient temperature
Indoor DB temperature (°F)
(PSIG)
Indoor DB temperature (°F)
Outdoor ambient temperature
86
80
75
70 86
80
75
70
65 70 75 80 85 90 95 100 105
200
250
300
350
400
450
500
(°F) (°F)
65 70 75 80 85 90 95 100 105
80
100
120
140
160
180
(PSIG)
Condensing pressure
Suction pressure
Outdoor ambient temperature
Indoor DB temperature (°F)
(PSIG)
Indoor DB temperature (°F)
Outdoor ambient temperature
86
80
75
70
86
80
75
70
OBH684B

18
75
70
65
75
70
65
(PSIG)
Condensing pressure
Outdoor ambient temperature
(°F) (°F)
(PSIG)
Suction pressure
Outdoor ambient temperature
5 15253545556575
250
290
330
370
410
450
58.5Hz
Indoor DB temperature (°F)
5 15253545556575
50
70
90
110
130
150
170
190
210
Indoor DB temperature (°F)
58.5Hz
Heating
Data are based on the condition of outdoor humidity 75%.
Air flow should be set to High speed.
Data are for heating operation without any frost.
75
70
65
75
70
65
(PSIG)
Condensing pressure
Outdoor ambient temperature
(°F) (°F)
(PSIG)
Suction pressure
Outdoor ambient temperature
5 15253545556575
250
290
330
370
410
450
49Hz
Indoor DB temperature (°F)
5 15253545556575
50
75
100
125
150
175
200
Indoor DB temperature (°F)
49Hz
MUZ-FH15NA MUZ-FH15NAH
MUZ-FH18NA MUZ-FH18NAH
75
70
65
75
70
65
(PSIG)
Condensing pressure
Outdoor ambient temperature
(°F) (°F)
(PSIG)
Suction pressure
Outdoor ambient temperature
5 15253545556575
250
300
350
400
450
500
550
50Hz
Indoor DB temperature (°F)
5 15253545556575
50
75
100
125
150
175
200
Indoor DB temperature (°F)
50Hz
MUZ-FH09NA MUZ-FH09NAH
MUZ-FH12NA MUZ-FH12NAH
75
70
65
75
70
65
(PSIG)
Condensing pressure
Outdoor ambient temperature
(°F) (°F)
(PSIG)
Suction pressure
Outdoor ambient temperature
5 15253545556575
300
350
400
450
500
550
600
61Hz
Indoor DB temperature (°F)
5 15253545556575
50
75
100
125
150
175
200
Indoor DB temperature (°F)
61Hz
OBH684B

19
7-4. STANDARD OPERATION DATA
Model MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA MSZ-FH18NA
Item Unit Cooling Heating Cooling Heating Cooling Heating Cooling Heating
Total
Capacity Btu/h 9,000 10,900 12,000 13,600 15,000 18,000 17,200 20,300
SHF — 0.92 — 0.83 — 0.70 — 0.67 —
Input kW 0.560 0.710 0.870 0.950 1.200 1.300 1.430 1.720
Rated frequency Hz 47 58.5 46 49 50.5 50 59.5 61
Electrical circuit
Indoor unit MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA MSZ-FH18NA
Power supply
V,
phase,
Hz
208/230, 1, 60
Input kW 0.029 0.029 0.031 0.033
Fan motor current A 0.30/0.27 0.30/0.27 0.31/0.28 0.34/0.31
Outdoor unit MUZ-FH09NA
MUZ-FH09NAH
MUZ-FH12NA
MUZ-FH12NAH
MUZ-FH15NA
MUZ-FH15NAH
MUZ-FH18NA
MUZ-FH18NAH
Power supply
V,
phase,
Hz
208/230, 1, 60
Input kW 0.531 0.681 0.841 0.921 1.169 1.269 1.397 1.687
Comp. current A 2.32/2.10 3.01/2.72 3.60/3.26 4.06/3.67 4.46/4.03 4.87/4.40 5.64/5.10 7.04/6.37
Fan motor current A 0.36/0.33 0.34/0.31 0.41/0.37 0.40/0.36 1.21/1.09 1.24/1.12 1.21/1.09 1.24/1.12
Refrigerant circuit
Condensing pressure PSIG 352 323 374 340 361 391 370 445
Suction pressure PSIG 153 110 135 106 131 108 125 107
Discharge temperature ˚F 148 145 156 148 152 170 153 189
Condensing temperature ˚F 107 101 112 105 109 115 111 123
Suction temperature ˚F6441563652454334
Comp. shell bottom temperature ˚F 129 125 137 128 135 147 141 167
Ref. pipe length ft. 25
Refrigerant charge (R410A) 2 lb. 9 oz. 3 lb 7 oz.
Indoor unit
Intake air temperature DB ˚F8070807080708070
WB ˚F6760676067606760
Discharge air temperature DB ˚F 58 99 56 101 52 111 50 119
WB ˚F 55 — 54 — 51 — 49 —
Fan speed (High) rpm 1,150 1,280 1,190 1,320 1,220 1,420 1,280 1,460
Airflow (High) CFM 328 (Wet) 437 342 (Wet) 454 354 (Wet) 497 376 (Wet) 514
Outdoor unit
Intake air temperature DB ˚F9547954795479547
WB ˚F — 43 — 43 — 43 — 43
Fan speed rpm 810 900 810 900 840 810 840 810
Airflow CFM 1,074 1,202 1,074 1,202 1,692 1,634 1,692 1,634
OBH684B

20
7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY
Capacity correction factors
Input correction factors
Input correction factors
Capacity correction factors
Correction of Cooling capacity
The operational frequency of compressor
Correction of Cooling total input
The operational frequency of compressor
Correction of Heating total input
The operational frequency of compressor
Correction of Heating capacity
The operational frequency of compressor
MUZ-FH09NA MUZ-FH09NAH
(Hz) (Hz) (Hz) (Hz)
MUZ-FH12NA MUZ-FH12NAH
Capacity correction factors
Input correction factors
Input correction factors
Capacity correction factors
Correction of Cooling capacity
The operational frequency of compressor
Correction of Cooling total input
The operational frequency of compressor
Correction of Heating total input
The operational frequency of compressor
Correction of Heating capacity
The operational frequency of compressor
(Hz) (Hz) (Hz) (Hz)
MUZ-FH15NA MUZ-FH15NAH
Capacity correction factors
Input correction factors
Input correction factors
Capacity correction factors
Correction of Cooling capacity
The operational frequency of compressor
Correction of Cooling total input
The operational frequency of compressor
Correction of Heating total input
The operational frequency of compressor
Correction of Heating capacity
The operational frequency of compressor
(Hz) (Hz) (Hz) (Hz)
0 25 50 75 100
0.0
0.5
1.0
1.5
2.0
0 255075100
0.0
0.5
1.0
1.5
2.0
0 255075100
0.0
0.5
1.0
1.5
2.0
0 25 50 75 100
0.0
0.5
1.0
1.5
2.0
2.5
0 25 50 75 100
0.0
0.5
1.0
1.5
2.0
0 255075100
0.0
0.5
1.0
1.5
2.0
0 255075100
0.0
0.5
1.0
1.5
2.0
0 25 50 75 100
0.0
0.5
1.0
1.5
2.0
2.5
3.0
0 25 50 75 100
0.0
0.5
1.0
1.5
2.0
0 255075100
0.0
0.5
1.0
1.5
2.0
0 255075100
0.0
0.5
1.0
1.5
2.0
0 25 50 75 100
0.0
0.5
1.0
1.5
2.0
2.5
7-6. HOW TO OPERATE FIXED-FREQUENCY OPERATION (Test run operation)
1. Press EMERGENCY OPERATION switch to start COOL or HEAT mode (COOL: Press once, HEAT: Press twice).
2. Test run operation starts and continues to operate for 30 minutes.
3. Compressor operates at rated frequency in COOL mode or 58 Hz in HEAT mode.
4. Indoor fan operates at High speed.
5. After 30 minutes, test run operation finishes and EMERGENCY OPERATION starts (operation frequency of compressor var-
ies).
6. To cancel test run operation (EMERGENCY OPERATION), press EMERGENCY OPERATION switch or any button on
remote controller.
MUZ-FH18NA MUZ-FH18NAH
Capacity correction factors
Input correction factors
Input correction factors
Capacity correction factors
Correction of Cooling capacity
The operational frequency of compressor
Correction of Cooling total input
The operational frequency of compressor
Correction of Heating total input
The operational frequency of compressor
Correction of Heating capacity
The operational frequency of compressor
(Hz) (Hz) (Hz) (Hz)
0 25 50 75 100
0.0
0.5
1.0
1.5
2.0
0 255075100
0.0
0.5
1.0
1.5
2.0
0 255075100
0.0
0.5
1.0
1.5
2.0
0 25 50 75 100
0.0
0.5
1.0
1.5
2.0
2.5
OBH684B