Mitsubishi Electric Mr.Slim MUZ-FE09NA User manual

SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ··································· 2
2. PART NAMES AND FUNCTIONS····················· 2
3. SPECIFICATION················································ 3
4. OUTLINES AND DIMENSIONS ························ 5
5. WIRING DIAGRAM············································ 6
6. REFRIGERANT SYSTEM DIAGRAM ··············· 7
7. DATA·································································· 9
8. ACTUATOR CONTROL··································· 16
9. SERVICE FUNCTIONS ··································· 17
10. TROUBLESHOOTING····································· 17
11. DISASSEMBLY INSTRUCTIONS···················· 36
Models
MUZ-FE09NA
MUZ-FE12NA
MUZ-FE18NA
SPLIT-TYPE AIR CONDITIONERS
OUTDOOR UNIT
Indoor unit service manual
MSZ-FE•NA Series (OBH542)
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
TM
HFC
utilized
R410A
No. OBH543
REVISED EDITION-A
PARTS CATALOG (OBB543)
Revision A:
• MUZ-FE18NA has been added.
Please void OBH543.
MUZ-FE09NA
MUZ-FE12NA

2
1TECHNICAL CHANGES
MUZ-FE09NA
MUZ-FE12NA
MUZ-FE18NA
1. New model
PART NAMES AND FUNCTIONS
2
MUZ-FE09NA MUZ-FE12NA
Air outlet
Drain outlet
Piping
Drain hose
Air inlet
(back and side)
Revision A:
• MUZ-FE18NA has been added.
MUZ-FE18NA
Piping
Air outlet
Drain outlet
Air inlet
(back and side)
Drain hose

3
3SPECIFICATION
Outdoor unit model MUZ-FE09NA MUZ-FE12NA MUZ-FE18NA
Capacity
Rated (Minimum~Maximum)
Cooling 1 Btu/h 9,000 (2,800~9,000) 12,000 (2,800~12,000) 18,000 (8,200~25,200)
Heating 47 1 Btu/h 10,900 (3,000~18,000) 13,600 (3,000~21,000) 21,600 (7,500~29,700)
Capacity Rated Heating 17 2 Btu/h 12,500 13,600 19,300
Power consumption
Rated (Minimum~Maximum)
Cooling 1 W
580 (160~650) 930 (160~960) 1,270 (570~2,280)
Heating 47 1 W
710 (150~2,250) 950 (150~2,250) 1,540 (520~2,420)
Power consumption Rated Heating 17 2 W 1,730 1,780 2,180
EER 1 [SEER] 3 Cooling 15.5 [26.0] 12.9 [23.0] 14.2 [20.2]
HSPF IV 4Heating 10.0 10.6 10.3
COP Heating 1 4.50 4.20 4.11
Power supply V , phase , Hz 208/230, 1 , 60
Max. fuse size (time delay) A 15 20
Min. circuit ampacity A 12 17.1
Fan motor F.L.A 0.56 0.93
Compressor
Model SNB130FQAH SNB172FQKMT
R.L.A 8.6 12.9
L.R.A 10.8 16.1
Refrigeration oil L (Model) 0.45 (NEO22) 0.40 (FV50S)
Refrigerant control Linear expansion valve
Sound level 1Cooling dB(A) 48 48 55
Heating dB(A) 49 49 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. 80 119
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) 3/8 (0.0315)
Gas in. 3/8 (0.0315) 5/8 (0.0315)
Connection method Indoor Flared Flared
Outdoor Flared Flared
Between the indoor
& outdoor units
Height difference ft. 40 50
Piping length ft. 65 100
Refrigerant charge (R410A) 2 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) Rated frequency
(Heating) — Indoor: 70˚FDB, 60˚FWB, Outdoor: 47˚FDB, 43˚FWB Rated frequency
2: (Heating) — Indoor: 70˚FDB, 60˚FWB, Outdoor: 17˚FDB, 15˚FWB Maximum frequency

4
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 -15
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

5
OUTLINES AND DIMENSIONS
4
Unit: inch
MUZ-FE09NA MUZ-FE12NA
Liquid pipe :1/4 (flared)
Gas pipe :3/8 (flared)
6-23/32
2
5-7/8
2-23/32
1-3/4
15-3/4
12 ~ 12-3/4
13-9/16
11/16
1-9/16
7/8
21-5/8
11-1/32
13/32
31-1/2
19-11/16
5-15/16
11-29/32
29/32 11-1/4
Air in
handle
Air in
Air out
2- 3/8 13/16 Oval hole
Drain hole 1-5/8
REQUIRED SPACE Basically open 4 inch or more
without any obstruction in front
and on both sides of the unit.
14 in. or more
8 in. or more
4 in. or more
4 in. or more
Open two sides of left,
right, or rear side.
MUZ-FE18NA
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) Ø3/8
Gas refrigerant
pipe joint
Refrigerant pipe
(flared) Ø5/8
14 in. or more
4 in. or more
REQUIRED SPACE
20 in. or more
4 in. or more
20 in. or more

6
5WIRING DIAGRAM
MUZ-FE09NA MUZ-FE12NA
MUZ-FE18NA

7
6REFRIGERANT SYSTEM DIAGRAM
Unit: inch
MUZ-FE09NA MUZ-FE12NA
Outdoor
heat
exchanger
Flared connection
Defrost
thermistor
RT61
Discharge
temperature
thermistor
RT62
Service
port
Service
port
Flared connection
Stop valve
(with strainer)
Stop valve
(with service port)
Refrigerant flow in cooling
Compressor
4-way valve
Refrigerant flow in heating
Refrigerant pipe ø 3/8
(with heat insulator)
Refrigerant pipe ø1/4
(with heat insulator)
R.V. coil
heating ON
cooling OFF
Strainer
#100
Capillary tube
Expansion
valve
Ambient
temperature
thermistor
RT65
Muffler
O.D. 0.118 × I.D. 0.071
× 23-5/8
(ø
3.0 × ø 1.8 × 600 )
Capillary tube
O.D. 0.118 ×I.D. 0.079×9-7/16
(ø3.0 × ø2.0 ×240)
Outdoor heat
exchanger
temperature
thermistor
RT68
Muffler
MUZ-FE18NA
Service
port
Service
port
Outdoor
heat
exchanger
Flared connection
Defrost
thermistor
RT61
Discharge
temperature
thermistor
RT62
Flared connection
Stop valve
Stop valve
(with service port)
Capillary tube
O.D. 0.157 ×I.D. 0.094×3-15/16
(ø4.0×ø2.4×100)
Compressor
4-way valve
Refrigerant pipe
ø 5/8
(with heat insulator)
Refrigerant pipe ø 3/8
(with heat insulator)
LEV
R.V. coil
heating ON
cooling OFF
Muffler
#100
Strainer
#100
Outdoor heat
exchanger
temperature
thermistor
RT68
Ambient
temperature
thermistor
RT65
Strainer
#100
Refrigerant flow in cooling
Refrigerant flow in heating

8
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-FE09NA
MUZ-FE12NA 65 40 3/8 1/4
MUZ-FE18NA 100 50 5/8 3/8
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-FE09NA
MUZ-FE12NA 2 lb. 9 oz. 0 1.62 4.86 8.10 11.34 12.96
Calculation: X oz. = 1.08/5 oz. / ft. × (Refrigerant piping length (ft.) - 25)
NOTE: Refrigerant piping exceeding 33 ft. requires additional refrigerant charge according to the calculation.
Model Outdoor unit
precharged
Refrigerant piping length (one way): ft.
33 40 50 60 70 80 90 100
MUZ-FE18NA 4 lb. 3 oz. 0 4.14 10.06 15.98 21.90 27.82 33.74 39.66
Calculation: X oz. = 2.96/5 oz. / ft. × (Refrigerant piping length (ft.) - 33)

9
DATA7
MUZ-FE09NA MUZ-FE12NA MUZ-FE18NA
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-FE09NA
71 11.0 6.9 0.58 10.3 6.5 0.63 9.7 6.1 0.68 9.0 5.6 0.72 8.3 5.2 0.75
67 10.4 7.9 0.55 9.7 7.4 0.60 9.0 6.8 0.65 8.4 6.4 0.69 7.7 5.8 0.72
63 9.8 8.8 0.52 9.1 8.1 0.58 8.5 7.6 0.62 7.7 6.9 0.66 7.0 6.3 0.69
MUZ-FE12NA
71 14.7 8.8 0.85 13.7 8.2 0.94 12.9 7.7 1.01 12.0 7.2 1.06 11.0 6.6 1.10
67 13.9 10.2 0.81 13.0 9.5 0.89 12.0 8.8 0.96 11.2 8.1 1.02 10.3 7.5 1.07
63 13.1 11.3 0.77 12.1 10.5 0.85 11.3 9.7 0.92 10.3 8.9 0.98 9.4 8.1 1.02
MUZ-FE18NA
71 22.1 15.6 1.13 20.6 14.6 1.24 19.4 13.7 1.33 18.0 12.7 1.40 16.6 11.7 1.46
67 20.9 17.5 1.07 19.4 16.3 1.17 18.0 15.1 1.27 16.7 14.1 1.35 15.4 12.9 1.41
63 19.6 19.1 1.02 18.2 17.7 1.12 16.9 16.5 1.21 15.4 15.0 1.30 14.0 13.7 1.35
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-FE09NA
MUZ-FE12NA 1.0 0.954 0.878 -
MUZ-FE18NA 1.0 0.954 0.878 0.771
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-FE09NA
75 4.8 0.44 6.3 0.56 7.9 0.66 9.4 0.73 10.6 0.77 11.0 0.78 12.4 0.81
70 5.2 0.42 6.7 0.54 8.2 0.64 9.6 0.71 10.9 0.75 11.2 0.77 12.7 0.80
65 5.5 0.41 6.9 0.52 8.6 0.62 10.0 0.69 11.2 0.73 11.6 0.74 13.0 0.78
MUZ-FE12NA
75 6.0 0.58 7.9 0.73 9.9 0.86 11.8 0.96 13.3 1.00 13.7 1.02 15.5 1.06
70 6.5 0.55 8.4 0.71 10.2 0.84 12.0 0.93 13.6 0.98 14.0 1.00 15.8 1.04
65 6.8 0.53 8.6 0.68 10.7 0.81 12.4 0.91 14.0 0.96 14.4 0.97 16.2 1.02
MUZ-FE18NA
75 9.5 0.91 12.5 1.15 15.7 1.35 18.7 1.50 21.1 1.58 21.7 1.60 24.6 1.66
70 10.3 0.87 13.3 1.11 16.2 1.32 19.1 1.46 21.6 1.54 22.2 1.57 25.2 1.63
65 10.8 0.83 13.6 1.06 17.0 1.27 19.8 1.42 22.2 1.50 22.9 1.52 25.7 1.60
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.

10
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
Indoor intake air WB temperature (°F)
SHF at rating condition = 0.76
= 307 CFM
Airflow
0.8
0.7
0.6
0.5
65 75 85 95 105 115
Outdoor intake air DB temperature (°F)
Total power consumption
(kW)
71
63
67
1.3
1.2
1.1
1.0
0.9
0.8
0.7
Indoor intake air WB temperature (°F)
SHF at rating condition = 0.73
= 350 CFM
Airflow
65 75 85 95 105 115
Outdoor intake air DB temperature (°F)
Total power consumption
(kW)
MUZ-FE09NA MUZ-FE12NA
MUZ-FE18NA
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 Dry-bulb 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 70 75 80 85 90 95 100 105 110 115
0.9
1.0
1.1
1.2
1.3
1.4
1.5
Indoor intake air WB temperature (°F)
Total power consumption
(kW)
SHF at rating condition = 0.84
= 634 CFM
Airflow
Outdoor intake air DB temperature (°F)