Mitsubishi Electric MUZ-FE09NA, MUZ-FE18NA, MUZ-FE12NA, MUZ-FE12NA1, MUZ-FE09NA - 1 Service Manual

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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.

No. OBH543

REVISED EDITION-A

PARTS CATALOG (OBB543)

Revision A:

• MUZ-FE18NA has been added.

Please void OBH543.

MUZ-FE09NA MUZ-FE12NA

HFC

utilized

R410A

TECHNICAL CHANGES

MUZ-FE09NA MUZ-FE12NA MUZ-FE18NA

1. New model

PART NAMES AND FUNCTIONS

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

Air outlet

Air inlet

(back and side)

Piping

Drain hose

Drain outlet

SPECIFICATION

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

580 (160~650) 930 (160~960)

1,270 (570~2,280)

Heating 47 1

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

[SEER] 3 Cooling 15.5 [26.0] 12.9 [23.0] 14.2 [20.2]

HSPF IV

Heating 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

Cooling 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 ﬁ nish 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

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

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

: 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

OUTLINES AND DIMENSIONS

Unit: inch

MUZ-FE09NA MUZ-FE12NA

MUZ-FE18NA

16-7/16

1-9/16

1-5/8

Drain hole

6-7/8

19-11/16

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

Liquid refrigerant pipe joint Refrigerant pipe (flared)

Ø 3/8

Gas refrigerant pipe joint Refrigerant pipe (flared)

Ø 5/8

14 in. or

4 in. or more

REQUIRED SPACE

20 in. or more

4 in. or more

20 in. or more

21-5/8

1-3/4

Air in

handle

11-1/32

7/8

13/32

15-3/4

Air in

11-29/32

5-15/16

Drain hole 1-5/8

Air out

2- 3/8 13/16 Oval hole

19-11/16

31-1/2

1-9/16

12 ~ 12-3/4

11/ 16

2-23/32

13-9/16

29/32 11-1/4

5-7/8

REQUIRED SPACE

4 in. or more

Open two sides of left, right, or rear side.

Liquid pipe :1/4 (flared) Gas pipe :3/8 (flared)

6-23/32

Basically open 4 inch or more without any obstruction in front and on both sides of the unit.

4 in. or more

14 in. or more

8 in. or more

WIRING DIAGRAM

MUZ-FE09NA MUZ-FE12NA

MUZ-FE18NA

REFRIGERANT SYSTEM DIAGRAM

Unit: inch

MUZ-FE09NA MUZ-FE12NA

MUZ-FE18NA

Refrigerant pipe ø3/8 (with heat insulator)

Stop valve (with service port)

Flared connection

Refrigerant pipe ø1/4 (with heat insulator)

4-way valve

Muffler

Service port

Stop valve (with strainer)

Capillary tube

O.D. 0.118 × I.D. 0.079× 9-7/16

(ø3.0 × ø2.0 × 240)

Discharge temperature thermistor RT62

O.D. 0.118 × I.D. 0.071

× 23-5/8

(ø

Expansion valve

Muffler

Service port

Compressor

Defrost thermistor RT61

Capillary tube

3.0

× ø

1.8×600

Outdoor heat exchanger temperature thermistor

)

Outdoor heat exchanger

Strainer

RT68

Ambient temperature thermistor RT65

#100

R.V. coil heating ON cooling OFF

Refrigerant flow in cooling Refrigerant flow in heating

Refrigerant pipe (with heat insulator)

Refrigerant pipe ø3/8 (with heat insulator)

5/8

Flared connection

4-way valve

Stop valve (with service port)

Service port

Strainer

#100

Stop valve

Muffler

#100

Service port

Discharge temperature thermistor RT62

Compressor

Capillary tube

LEV

Strainer

#100

Defrost thermistor RT61

O.D. 0.157 × I.D. 0.094× 3-15/16

(ø4.0×ø2.4×100)

Outdoor heat exchanger

Outdoor heat exchanger temperature thermistor RT68

R.V. coil heating ON cooling OFF

Ambient temperature thermistor RT65

Refrigerant flow in cooling Refrigerant flow in heating

Max. Length A

Max. Height

difference

Indoor unit

Outdoor unit

MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE

Model

Refrigerant piping: ft. Piping size O.D: in.

Max. Length

Max. Height difference

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)

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 (x10

Btu/h)

SHC : Sensible Heat Capacity (x10

Btu/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 (x10

Btu/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.

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.

MUZ-FE09NA MUZ-FE12NA

MUZ-FE18NA

1.5

Cooling capacity (

1.4

1.3

1.2

1.1

difference (°F)

1.0

Capacity correction factors

0.9

Indoor air Wet-bulb temperature

14 23 32 41 50 59 68 77 86 95 104 113

Outdoor intake air Dry-bulb temperature(°F)

at Rated frequency)

Indoor intake air Wet-bulb temperature( F)

72 68 64

SHF at rating condition = 0.76

0.8

0.7

(kW)

0.6

Indoor intake air WB temperature (°F)

0.5

Total power consumption

65 75 85 95 105 115

Outdoor intake air DB temperature (°F)

Airflow

= 307 CFM

1.3

71 67 63

1.2

1.1

1.0

(kW)

0.9

0.8

0.7

Total power consumption

Indoor intake air WB temperature (°F)

65 75 85 95 105 115

Outdoor intake air DB temperature (°F)

SHF at rating condition = 0.73

Airflow

= 350 CFM

71 67 63

1.5

1.4

1.3

1.2

(kW)

1.1

1.0

Total power consumption

0.9 65 70 75 80 85 90 95 100 105 110 115

Outdoor intake air DB temperature (°F)

SHF at rating condition = 0.84

= 634 CFM

Airflow

oor intake air WB temperature (°F)

Ind

71 67 63

Heating

MUZ-FE09NA

MUZ-FE12NA

MUZ-FE18NA

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.

1.3

1.2

1.1

1.0

0.9

0.8

0.7

difference (°F)

0.6

0.5

Capacity correction factor

Indoor air Dry-bulb temperature

0.4

-4 5 142332415059

Heating capacity (

Indoor intake air Dry-bulb temperature ( F)

at Rated frequency)

Outdoor intake air Wet-bulb temperature (°F)

0.9

0.8

0.7

0.6

0.5

0.4

(kW)

0.3

0.2

0.1 0

Total power consumption

-15 -5 Outdoor intake air WB temperature (°F)

oor intake air

Ind

1552535455565

Airflow

DB temperature (°F)

1.8

1.6

1.4

1.2

1.0

(kW)

0.8

0.6

Indoor intake air DB temperature (°F)

0.4

0.2

Total power consumption

-15 -5 5 15 25 35 45 55 65

Outdoor intake air WB temperature (°F)

Airflow

= 381 CFM

= 738 CFM

Airflow

75 70 65

1.1

1.0

0.9

0.8

0.7

0.6

0.5

(kW)

0.4

0.3

0.2

0.1

Total power consumption

-5

-15 Outdoor intake air WB temperature (°F)

Indoor intake air DB tem

1552535455565

= 420 CFM

perature (°F)

75 70 65

7-3. CONDENSING PRESSURE Cooling

Data is based on the condition of indoor humidity 50 %. Air flow should be set to High speed.

MUZ-FE12NA

(PSIG)

Condensing pressure

86 80 75 70

68 70 75 80 85 90 95 100 105(°F)

120

125

130

135

140

145

150

155

160

165

170

175

180

Suction pressure

Outdoor ambient temperature

Indoor DB temperature (°F)

(PSIG)

68 70 75 80 85 90 95 100 105(°F)

260

300

340

380

420

460

500

540

580

Indoor DB temperature (°F)

Outdoor ambient temperature

MUZ-FE09NA

(PSIG)

Condensing pressure

86 80 75 70

68 70 75 80 85 90 95 100 105(°F)

120

125

130

135

140

145

150

155

160

165

170

175

180

Suction pressure

Outdoor ambient temperature

Indoor DB temperature (°F)

(PSIG)

68 70 75 80 85 90 95 100 105(°F)

260

300

340

380

420

460

500

540

580

Indoor DB temperature (°F)

Outdoor ambient temperature

MUZ-FE18NA

(PSIG)

Condensing pressure

86 80 75 70

70 75 80 85 90 95 100

105(°F)

110

120

130

140

150

160

170

180

190

Suction pressure

Outdoor ambient temperature

Indoor DB temperature (°F)

(PSIG)

100

105(°F)

240

280

320

360

400

440

480

Indoor DB temperature (°F)

Outdoor ambient temperature

68 70 75 80 85 90 95 100

105(°F)

110

120

130

140

150

160

170

180

190

75 70

(PSIG)

Condensing pressure

Outdoor ambient temperature

155 10 2025303540455055606570(°F)

220 200 180 160 140

240

260

280

320 300

340

360

380

400

75 70 65

Suction pressure

Outdoor ambient temperature

15 205 10 25303540455055606570(°F)

100

110

120

130

140

150

160

170

-10

-15

-10

-15

120

Ind

oor DB temperature (°F)

Indoor DB temperature (°F)

58Hz

Heating

Data is based on the condition of outdoor humidity 75%. Air flow should be set to High speed. Data is for heating operation without any frost.

MUZ-FE12NA

MUZ-FE09NA

70 65

(PSIG) (PSIG)

Condensing pressure

Outdoor ambient temperature

20 25 305 1015 3540455055606570(°F)

220 200 180 160 140

240

260

280

320 300

340

360

380

400

75 70 65

Suction pressure

Outdoor ambient temperature

20 25 305 1015 3540455055606570(°F)

100

110

120

130

140

150

160

170

120

-10

-15

-15 -10

Indoor DB

temperature (°F)

Indoor DB temperature (°F)

58Hz

MUZ-FE18NA

(PSIG)

Condensing pressure

75 70 65

Suction pressure

Outdoor ambient temperature

(PSIG)

-15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 55

65 70 75(°F)

240

260

280

300

320

340

360

380

400

420

440

460

480

-15

-10-505101520253035404550

657075(°F)

100

120

140

160

180

200

220

240

Indoor DB temperature (°F)

Outdoor ambient temperature

Indoor DB temperature (°F)

58Hz

7-4. STANDARD OPERATION DATA

Model MSZ-FE09NA MSZ-FE12NA MSZ-FE18NA

Item Unit Cooling Heating Cooling Heating Cooling Heating

Total

Capacity Btu/h 9,000 10,900 12,000 13,600 18,000 21,600

SHF — 0.76 — 0.73 — 0.84 —

Input kW 0.580 0.710 0.930 0.950 1.800 2.200

Rated frequency Hz 34 42 51 52.5 50.5 62.5

Electrical circuit

Indoor unit MSZ-FE09NA MSZ-FE12NA MSZ-FE18NA

Power supply

phase,

208/230, 1, 60

Input kW 0.018 0.024 0.024 0.030 0.058

Fan motor current A 0.19/0.17 0.25/0.23 0.25/0.23 0.32/0.29 0.56/0.51 Outdoor unit MUZ-FE09NA MUZ-FE12NA MUZ-FE18NA

Power supply

phase,

208/230, 1, 60

Input kW 0.562 0.686 0.906 0.920 1.212 1.482

Comp. current A 2.38/2.15 2.98/2.70 4.05/3.66 4.12/3.72 4.47/4.04 5.72/5.17

Fan motor current A 0.35/0.32 1.16/1.05 1.13/1.02

Refrigerant circuit

Condensing pressure PSIG 376 355 402 392 373 357

Suction pressure PSIG 154 108 148 104 151 107

Discharge temperature ˚F 142 145 160 158 150 159

Condensing temperature ˚F 112 108 117 115 111 105

Suction temperature ˚F533653345841

Comp. shell bottom temperature ˚F 144 128 146 129 132 136

Ref. pipe length ft. 25

Refrigerant charge (R410A) 2 lb. 9 oz. 4 lb 3 oz.

Indoor unit

Intake air temperature

DB ˚F807080708070

WB ˚F676067606760

Discharge air temperature

DB ˚F 59 99 58 101 59 102

WB ˚F56—55—56—

Fan speed (High) rpm 1,020 1,120 1,120 1,220 1,300

Airﬂ ow (High) CFM 307 (Wet) 381 350 (Wet) 420 634 (Wet) 738

Outdoor unit

Intake air temperature

DB ˚F954795479547

WB ˚F — 43 — 43 — 43

Fan speed rpm 810 870 810 870 840 810

Airﬂ ow CFM 1,102 1,187 1,102 1,187 1,769 1,701

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Mitsubishi Electric MUZ-FE09NA, MUZ-FE18NA, MUZ-FE12NA, MUZ-FE12NA1, MUZ-FE09NA - 1 Service Manual

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Frequently Asked Questions

User Manual