Mitsubishi Electronics MUY-D36NA, U1, MUY-D30NA, MUZ-D30NA, MUZ-D36NA User Manual

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OUTDOOR UNIT

SERVICE MANUAL

Wireless type Models

MUZ-D30NA MUZ-D30NA-

MUZ-D36NA MUZ-D36NA-

MUY-D30NA MUY-D36NA

HFC

No. OBH502

utilized

R410A

Indoor unit service manual MSZ-D•NA Series (OBH501) MSY-D•NA Series (OBH501)

NOTE:

RoHS compliant products have <G> mark on the spec name plate.

CONTENTS

1. TECHNICAL CHANGES ··································· 3

2. PART NAMES AND FUNCTIONS ····················· 3

3. SPECIFICATION ················································ 4

4. OUTLINES AND DIMENSIONS ························ 6

5. WIRING DIAGRAM ············································ 7

6. REFRIGERANT SYSTEM DIAGRAM ··············· 9

7. DATA ································································· 11

8. ACTUA TOR CONTROL ··································· 18

9. SERVICE FUNCTIONS ··································· 19

10. TROUBLESHOOTING ····································· 20

11. DISASSEMBLY INSTRUCTIONS ···················· 39

PARTS CATALOG (OBB502)

TECHNICAL CHANGES

MUZ-D30NA MUZ-D30NA MUZ-D36NA MUZ-D36NA MUY-D30NA MUY-D36NA

1. New model

PART NAMES AND FUNCTIONS

MUZ-D30NA MUY-D30NA

MUZ-D36NA MUY-D36NA

Air inlet

(back and side)

Piping

Drain hose

Air outlet

Drain outlet

Item Model MSZ-D30NA MSY-D30NA MSZ-D36NA MSY-D36NA

Capacity

Rated(Minimum~Maximum)

Capacity Rated Heating 17

Power consumption

Rated(Minimum~Maximum)

(TOTAL)

Power consumption Rated

EER 1 [SEER] 3 Cooling 8.0 [14.5] 9.1 [16.0]

HSPF IV(V) COP Heating 1 2.84 — 2.69 —

Outdoor unit model MUZ-D30NA MUY-D30NA MUZ-D36NA MUY-D36NA External ﬁ nish Munsell 3Y 7.8/1.1

Power supply V , phase , Hz 208/230 , 1 , 60 Max. fuse size (time delay) A 25 Min. circuit ampacity A 21 Fan motor F.L.A 0.93

Compressor

Refrigerant control Liner expansion valve

Sound level 1

Defrost method Reverse cycle — Reverse cycle —

Dimensions

Weight Ib. 141 126 141 126 Remote controller Wireless type Control voltage (by built-in transformer) 12 - 24 VDC Refrigerant piping Not supplied

Refrigerant pipe size (Min. wall thickness)

Connection method

Between the indoor & outdoor units

Refrigerant charge (R410A) 4 lb. 10 oz. 4 lb. 4 lb. 10 oz. 4 lb. Refrigeration oil (Model) NE022

NOTE : Test conditions are based on ARI 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

SPECIFICATION

Cooling 1 Btu/h

Heating 47 1 Btu/h

2 Btu/h 20,800 — 22,800 —

Cooling

Heating 47 1W

Heating 17 2 W 2,620 — 3,000 —

4 Heating (8.2) — (8.2) —

Cooling dB(A) 55 55 56 56 Heating dB(A) 57 — 57 —

W in. 33-1/16 D in. 13 H in. 33-7/16

Liquid in. 3/8 (0.0315) Gas in. 5/8 (0.0394) Indoor Flared Outdoor Flared Height

difference Piping length ft. 100

Model TNB220FMCHT R.L.A 16 L.R.A 20

ft. 50

30,700

(9,800 ~ 30,700)

32,600

(8,700 ~ 34,000)

3,850

(620 ~ 3,850)

3,360

(520 ~ 3,600)

30,700

(9,800 ~ 30,700)

—

3,380

(620 ~ 3,380)

—

32,000/33,200

(9,800 ~ 32,000) /

(9,800 ~ 33,200)

35,200

(8,700 ~ 36,000)

4,140/4,360

(620 ~ 4,140) /

(620 ~ 4,360)

3,840

(520 ~ 4,100)

7.7/7.6 [14.5]

33,200/34,600

(9,800 ~ 33,200) /

(9,800 ~ 34,600)

(620 ~ 4,210) /

(620 ~ 4,240)

—

210/4,240

—

7.9/8.2 [15.1]

Test condition

3, 4

Mode Test

ARI

"A" Cooling Steady State at rated compressor Speed

"B-2" Cooling Steady State at rated compressor Speed

SEER

(Cooling)

HSPF

(Heating)

"B-1" Cooling Steady State at minimum compressor Speed

Low ambient Cooling Steady State at minimum compressor Speed

Intermediate Cooling Steady State at Intermediate compressor Speed

Standard Rating-Heating at rated compressor Speed

Low temperature Heating at rated compressor Speed

Max temperature Heating at minimum compressor Speed

High temperature Heating at minimum compressor Speed

Frost Accumulation at rated compressor Speed

Frost Accumulation at Intermediate compressor Speed

5 : At Intermediate compressor Speed

=("Cooling rated compressor speed" - "minimum compressor speed") / 3 + "minimum compressor speed".

Indoor air condition Outdoor air condition

Dry bulb (°F) Wet bulb (°F) Dry bulb (°F) Wet bulb (°F)

80 67 95 (75)

80 67 82 (65)

80 67 67 (53.5)

80 67 87 (69)

70 60 47 43

70 60 17 15

70 60 62 56.5

70 60 47 43

70 60 35 33

OPERATING RANGE

(1) POWER SUPPLY

Outdoor unit

(2) OPERATION

Mode Condition

Standard temperature 80 67 95 —

Cooling

Heating

Maximum temperature 90 73 115 — Minimum temperature 67 57 14 — Maximum humidity 78 % — Standard temperature 70 60 47 43 Maximum temperature 80 67 75 65 Minimum temperature 70 60 14 13

Rated voltage Guaranteed Voltage

208/230 V

1 phase

60 Hz

Min.187 V

DB WB DB WB

208 V 230 V Max.253 V

Intake air temperature (°F)

Indoor Outdoor

OUTLINES AND DIMENSIONS

MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA

REQUIRED SPACE

4 i

n. or more

Open as a rule 20 inch or more if the back, both sides and top are open

Unit: inch

Open as a rule 20 inch or more if the front and both sides are open

4 inch or more / 8 inch or more if there are obstacles to both sides

14 in. or more

MUZ-D30NA MUZ-D36NA

WIRING DIAGRAM

MUY-D30NA MUY-D36NA

REFRIGERANT SYSTEM DIAGRAM

MUZ-D30NA MUZ-D36NA

Refrigerant pipe (with heat insulator)

Refrigerant pipe 3/8 (with heat insulator)

5/8

Flared connection

4-way valve

Stop valve (with service port)

Receiver

Stop valve

Oil separator

Service port

Strainer

#100

Capillary tube

LEV

O.D. 0.142 I.D. 0.094

1-31/32

3.6 2.4 50

(

Strainer

#100

High-pressure Switch

Discharge temperature thermistor RT62

Compressor

Strainer

#100

)

Capillary tube

O.D. 0.071 x I.D. 0.024 x 39-3/8 ( 1.8 x 0.6 x 1,000)

Service port

Defrost thermistor RT61

Refrigerant flow in cooling Refrigerant flow in heating

Outdoor heat exchanger

Outdoor heat exchanger temperature thermistor RT68

R.V. coil heating ON cooling OFF

Ambient temperature thermistor RT65

Unit:inch

MUY-D30NA MUY-D36NA

Refrigerant pipe 5/8 (with heat insulator)

Flared connection

Oil separator

Capillary tube

O.D. 0.071 x I.D. 0.024 x 39-3/8 ( 1.8 x 0.6 x 1,000)

Stop valve (with service port)

Service port

Strainer

#100

Compressor

LEV

Service port

High-pressure Switch

Discharge temperature thermistor RT62

Strainer

#100

Outdoor heat exchanger

Outdoor heat exchanger temperature thermistor RT68

Ambient temperature thermistor RT65

Unit:inch

Refrigerant pipe 3/8 (with heat insulator)

Stop valve

Capillary tube

O.D. 0.142 x I.D. 0.094 x 1-31/32 ( 3.6 x 2.4 x 50)

Refrigerant flow in cooling

MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE

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

Model

Max. Length

Max. Height difference

Gas Liquid

MUZ-D30NA MUZ-D36NA MUY-D30NA

100 50 5/8 3/8

MUY-D36NA

Indoor unit

Max. Height

difference

Max. length A

Outdoor unit

ADDITIONAL REFRIGERANT CHARGE (R410A:oz.)

Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation.

Model

Outdoor unit

precharged

25 30 40 50 60 70 80 90 100

Refrigerant piping length (one way) : ft.

MUZ-D30NA MUZ-D36NA

4 lb. 10 oz. 0 2.96 8.88 14.80 20.72 26.64 32.56 38.48 44.40

Calculation : X oz. = 2.96/5 oz. / ft. x (Refrigerant piping length (ft.) - 25)

Model

MUY-D30NA MUY-D36NA

Outdoor unit

precharged

25 30 40 50 60 70 80 90 100

4 lb. 0 1.08 3.24 5.40 7.56 9.72 11.88 14.04 16.20

Refrigerant piping length (one way) : ft.

Calculation : X oz. = 1.08/5 oz. / ft. x (Refrigerant piping length (ft.) - 25)

NOTE : Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation.

DATA7

MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA

7-1. PERFORMANCE DATA

1) COOLING CAPACITY

Indoor air Outdoor intake air DB temperature (˚F)

Model

MUZ-D30NA

MUZ-D36NA

MUY-D30NA

MUY-D36NA

(208 V)

MUY-D36NA

(230 V)

NOTE : 1. IWB : Intake air wet-bulb temperature

TC : Total Capacity (x10 SHC : Sensible Heat Capacity (x10 TPC : Total Power Consumption (kW)

2. SHC is based on 80 ˚F of indoor Intake air DB temperature.

IWB 75 85 95 105 115

(˚F) TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC

71 37.6 19.1 3.43 35.2 17.8 3.75 33.0 16.7 4.04 30.7 15.6 4.25 28.2 14.3 4.43 67 35.6 22.8 3.23 33.2 21.2 3.56 30.7 19.6 3.85 28.6 18.3 4.08 26.2 16.8 4.27 63 33.5 25.9 3.08 31.0 24.0 3.41 28.9 22.3 3.68 26.2 20.3 3.93 23.9 18.5 4.08 71 40.7 19.8 3.88 38.0 18.5 4.25 35.7 17.4 4.58 33.2 16.2 4.82 30.5 14.9 5.01 67 38.5 23.9 3.66 35.9 22.2 4.03 33.2 20.6 4.36 30.9 19.1 4.62 28.4 17.6 4.84 63 36.2 27.3 3.49 33.5 25.3 3.86 31.2 23.5 4.16 28.4 21.4 4.45 25.9 19.5 4.62 71 37.6 19.1 3.01 35.2 17.8 3.30 33.0 16.7 3.55 30.7 15.6 3.73 28.2 14.3 3.89 67 35.6 22.8 2.84 33.2 21.2 3.13 30.7 19.6 3.38 28.6 18.3 3.58 26.2 16.8 3.75 63 33.5 25.9 2.70 31.0 24.0 2.99 28.9 22.3 3.23 26.2 20.3 3.45 23.9 18.5 3.58 71 40.7 19.8 3.75 38.0 18.5 4.10 35.7 17.4 4.42 33.2 16.2 4.65 30.5 14.9 4.84 67 38.5 23.9 3.54 35.9 22.2 3.89 33.2 20.6 4.21 30.9 19.1 4.46 28.4 17.6 4.67 63 36.2 27.3 3.37 33.5 25.3 3.73 31.2 23.5 4.02 28.4 21.4 4.29 25.9 19.5 4.46 71 42.4 20.6 3.77 39.6 19.3 4.13 37.2 18.1 4.45 34.6 16.8 4.69 31.8 15.5 4.88 67 40.1 24.9 3.56 37.4 23.2 3.92 34.6 21.5 4.24 32.2 20.0 4.49 29.6 18.3 4.71 63 37.7 28.4 3.39 34.9 26.3 3.75 32.5 24.5 4.05 29.6 22.3 4.32 27.0 20.3 4.49

Btu/h)

2) COOLING CAPACITY CORRECTIONS

Refrigerant piping length (one way : ft.)

25 (std.) 40 65 100

MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA

1.0 0.95 0.878 0.713

3) HEATING CAPACITY

Indoor air Outdoor intake air WB temperature (˚F)

Model

MUZ-D30NA

MUZ-D36NA

IDB 15 25 35 43 45 55 (˚F) TC TPC TC TPC TC TPC TC TPC TC TPC TC TPC

75 18.9 2.50 23.6 2.94 28.2 3.28 31.8 3.44 32.8 3.49 37.2 3.63 70 20.0 2.42 24.5 2.87 28.9 3.19 32.6 3.36 33.6 3.43 38.0 3.56 65 20.5 2.32 25.6 2.77 29.8 3.11 33.6 3.28 34.6 3.33 38.8 3.49 75 20.4 2.86 25.5 3.36 30.4 3.74 34.3 3.94 35.4 3.99 40.1 4.15 70 21.6 2.76 26.4 3.28 31.2 3.65 35.2 3.84 36.3 3.92 41.0 4.07 65 22.2 2.65 27.6 3.17 32.2 3.55 36.3 3.74 37.3 3.80 41.9 3.99

NOTE : 1. IDB : Intake air dry-bulb temperature

TC : Total Capacity (x103 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

MUZ-D30NA

SHF at rating condition = 0.64

40 38 36 34

Indoor intake air WB temperature (°F)

Btu/h)

Total capacity

(10

26 24

4.5

4.3

4.1

3.9

3.7

(kW)

Indoor intake air WB temperat

3.5

3.3

3.1

Total power consumption

65 75 85 95 105 115

Outdoor intake air DB temperature (°F)

Airflow

MUY-D36NA

SHF at rating condition = 0.62

Ind

Btu/h)

Total capacity

(10

(kW)

Total power consumption

oor intake air WB temperature (°F)

5.0

4.6

4.2

oor intake air WB te

Ind

3.8

3.4

65 75 85 95 105 115

Outdoor intake air DB temperature (°F)

Airflow

mpe

= 763 CFM

ure (°F

= 763 CFM

rature (°F)

MUZ-D36NA

SHF at rating condition = 0.62

43 41 39 37

Indoor intake air WB temperature (°F)

Btu/h)

71 67 63

)

71 67 63

Total capacity

(10

29 27

5.2

4.8

4.4

(kW)

Indoor intake air WB temperat

4.0

3.6

Total power consumption

65 75 85 95 105 115

Outdoor intake air DB temperature (°F)

Airflow

= 763 CFM

ure (°F)

71 67 63

MUY-D30NA

SHF at rating condition = 0.64

40 38 36 34

Indoor intake air WB temperature (°F)

Btu/h)

Total capacity

(10

26 24

4.0

3.8

3.6

3.4

3.2

(kW)

Indoor intake air WB temperature (°F)

3.0

2.8

2.6

Total power consumption

65 75 85 95 105 115

Outdoor intake air DB temperature (°F)

Airflow

= 763 CFM

71 67 63

Heating

MUZ-D30NA

= 848 CFM

Btu/h)

Total capacity

(10

4.0

3.6

3.2

(kW)

2.8

2.4

Total power consumption

15 25 35 45 55

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.

Airflow

Indoor intake air DB temperature (°F)

Indoor intake air DB temperature (°F

Outdoor intake air WB temperature (°F)

65 70 75

)

75 70 65

MUZ-D36NA

= 848 CFM

Btu/h)

Total capacity

(10

4.5

4.1

3.7

(kW)

3.3

2.9

Total power consumption

15 25 35 45 55

Airflow

oor intake air DB temperature (°F)

Ind

Indoor intake air DB temperature (°F)

Outdoor intake air WB temperature (°F)

1212

65 70 75

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-D30NA

(PSIG)

580

540

500

460

420

380

Condensing pressure

340

300

260

68 70 75 80 85 90 95 100 105(°F)

Indoor DB temperature (°F)

Outdoor ambient temperature

86 80 75 70

MUZ-D36NA

(PSIG)

580

540

500

460

420

380

Condensing pressure

340

300

260

68 70 75 80 85 90 95 100 105(°F)

Indoor DB temperature (°F)

Outdoor ambient temperature

86 80 75 70

MUY-D30NA

(PSIG)

150

140

130

120

110

Suction pressure

100

68 70 75 80 85 90 95 100 105(°F)

(PSIG)

150

140

130

120

110

Suction pressure

100

68 70 75 80 85 90 95 100 105(°F)

Indoor DB temperature (°F

Outdoor ambient temperature

Indoor DB temperature (°F)

Outdoor ambient temperature

)

(PSIG)

580

540

500

460

420

380

Condensing pressure

340

300

260

68 70 75 80 85 90 95 100 105(°F)

Indoor DB temperat

Outdoor ambient temperature

ure (°F)

86 80 75 70

(PSIG)

150

140

130

120

110

Suction pressure

100

68 70 75 80 85 90 95 100 105(°F)

Indoor DB temperature (°F)

Outdoor ambient temperature

1313

MUY-D36NA

(PSIG)

580

540

500

460

Indoor DB temperature (°F)

80 75 70

420

380

Condensing pressure

340

300

260

68 70 75 80 85 90 95 100 105(°F)

Outdoor ambient temperature

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-D30NA

(PSIG)

150

140

130

Indoor DB temperature (°F)

120

110

Suction pressure

100

68 70 75 80 85 90 95 100 105(°F)

Outdoor ambient temperature

(PSIG)

500

480

460

440

420

400

380

360

340

320

300

Condensing pressure

280

260

240

220

200

14 20 25 30 35 40 45 50 55 60 65 70(°F)

MUZ-D36NA

(PSIG)

500

480

460

440

420

400

380

360

340

320

300

Condensing pressure

280

260

240

220

200

14 20 25 30 35 40 45 50 55 60 65 70(°F)

°F)

ure(

perat

oor DB tem

Ind

Outdoor ambient temperature

°F)

Indoor DB temperature(

Outdoor ambient temperature

58Hz

(PSIG)

150

140

130

120

110

100

Suction pressure

14 20 25 30 35 40 45 50 55

(PSIG)

150

140

130

120

110

100

Suction pressure

14 20 25 30 35 40 45 50 55

Indoor DB temperature (°F)

Outdoor ambient temperature

Indoor DB temperature (°F)

Outdoor ambient temperature

58Hz

60 65 70(°F)

58Hz

60 65 70(°F)

75 70 65

7-4. STANDARD OPERATION DATA

Model MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA

Item Unit Cooling Heating Cooling Heating Cooling Cooling

Capacity Btu / h 30,700 32,600 32,000/33,200 35,200 30,700 33,200/34,000

SHF — 0.64 — 0.62 — 0.64 0.62

Total

Input kW 3.85 3.36 4.14/4.36 3.84 3.38 4.21/4.24

Rated frequency Hz 84 84 91 91 79 92 Indoor unit MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA

Power supply

Input kW 0.058

Fan motor current A 0.45/0.42 Outdoor unit MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA

Power supply

Electrical circuit

Input kW 3.792 3.302 4.082/4.302 3.782 3.322 4.152/4.182

Comp. current A 17.25/15.56 14.95/13.46 18.65/17.86 17.25/15.56 15.05/13.56 18.95/17.26

Fan motor current A 0.80/0.72

Condensing pressure PSIG 468 404 480 420 453 475

Suction pressure PSIG 126 96 122 94 125 119

Discharge temperature ˚F 186.8 169.7 198.7 168.8 191.3 197.1

Condensing temperature ˚F 126.5 114.3 128.5 117.0 123.8 127.4

Suction temperature ˚F 45.5 29.8 48.0 29.1 54.7 48.6

Comp. shell bottom temperature ˚F 175.6 156.4 187.0 155.7 177.4 182.7

Refrigerant circuit

Ref. pipe length ft. 25

Refrigerant charge (R410A) — 4 lb. 10 oz. 4 lb.

Intake air temperature

Discharge air temperature

Indoor unit

Fan speed (High) rpm 1,100

Airﬂ ow (High) CFM 741 (Wet) 795 738 (Wet) 794 718 (Wet) 710 (Wet)

Intake air temperature

Fan speed rpm 800

Outdoor unit

Airﬂ ow CFM 1,941

phase,

DB ˚F 80 70 80 70 80 80

WB ˚F 67 60 67 60 67 67

DB ˚F 53.9 112.2 53 114.9 53.7 51.7

WB ˚F 53 73.9 52.1 74.6 52.8 50.8

DB ˚F 95 47 95 47 95 95

WB ˚F — 43 — 43 — —

208/230 , 1 , 60

1515

7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY

MUZ-D30NA

Correction of Cooling capacity

1.5

Correction of Cooling total input

1.5

Correction of Heating capacity

1.5

Correction of Heating total input

1.5

1.0

0.5

Capacity correction factors

0 50 100 150

The operational frequency of compressor

MUZ-D36NA

Correction of Cooling capacity

1.5

1.0

0.5

Capacity correction factors

0 50 100 150

The operational frequency of compressor

MUY-D30NA

Correction of Cooling capacity

1.5

1.0

0.5

Input correction factors

(Hz)

0 50 100 150

The operational frequency of compressor

Correction of Cooling total input

1.5

1.0

0.5

Input correction factors

(Hz)

0 50 100 150

The operational frequency of compressor

Correction of Cooling total input

1.5

1.0

0.5

Capacity correction factors

(Hz)

0 50 100 150

The operational frequency of compressor

Correction of Heating capacity

1.5

1.0

0.5

Capacity correction factors

(Hz)

0 50 100 150

The operational frequency of compressor

1.0

0.5

Input correction factors

(Hz)

0 50 100 150

The operational frequency of compressor

Correction of Heating total input

1.5

1.0

0.5

Input correction factors

(Hz)

0 50 100 150

The operational frequency of compressor

(Hz)

1.0

0.5

Capacity correction factors

0 50 100 150

The operational frequency of compressor

MUY-D36NA

Correction of Cooling capacity

1.5

1.0

0.5

Capacity correction factors

0 50 100 150

The operational frequency of compressor

1.0

0.5

Input correction factors

(Hz)

0 50 100 150

The operational frequency of compressor

Correction of Cooling total input

1.5

1.0

0.5

Input correction factors

(Hz)

0 50 100 150

The operational frequency of compressor

7-6. TEST RUN OPERATION (How to operate fixed-frequency operation)

1. Press EMERGENCY OPERATION switch to 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 varies).

6. To cancel test run operation (EMERGENCY OPERATION), press EMERGENCY OPERATION switch or any button on remote controller.

ACTUATOR CONTROL

MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA

8-1. OUTDOOR FAN MOTOR CONTROL

The fan motor turns ON/OFF, interlocking with the compressor. [ON] The fan motor turns ON 5 seconds before the compressor starts up. [OFF] The fan motor turns OFF 15 seconds after the compressor has stopped running.

5 seconds 15 seconds

Compressor

OFF

Outdoor fan motor

OFF

8-2. R.V. COIL CONTROL <MUZ>

Heating Cooling Dry

NOTE: The 4-way valve reverses for 5 seconds right before start-up of the compressor.

. . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . .

ON OFF OFF

<COOL>

5 seconds

<HEAT>

5 seconds

R.V.coil

Outdoor fan

motor

8-3. Relation between main sensor and actuator

Sensor Purpose

Discharge temperature thermistor Protection

Indoor coil temperature thermistor

Defrost thermistor Defrosting Fin temperature thermistor Protection Outdoor heat exchanger temperature Ambient temperature thermistor

OFF

ON or OFF

Cooling : Coil frost prevention Heating : High pressure protection

Protection Cooling : Low ambient temperature operation

ON or OFF

Actuator

Compressor

LEV

Outdoor

fan motor

R.V. coil

Indoor

fan motor

○○ ○ ○○○ ○○○○○ ○○ ○○○ ○○○

SERVICE FUNCTIONS

MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA

9-1. PRE-HEAT CONTROL

If moisture gets into the refrigerant cycle, or when refrigerant is liqueﬁ ed and col- lected in the compressor, it may interfere the start-up of the compressor. To improve start-up condition, the compressor is energized even while it is not operating. This is to generate heat at the winding. The compressor uses about 50 W when pre-heat control is turned ON. Pre-heat control is ON at initial setting.

[How to activate pre-heat control]

1. Turn OFF the power supply for the air conditioner before making the setting.

2. Set the 2nd Dip Switch of SW1 on the outdoor electronic control P.C. board to ON to activate pre-heat control function.

The compressor is energized even while it is not operating. This is to generate heat at the winding to improve the compressor's start-up condition.

1234

Power

Compressor

Outside temperature

Pre-heat

OFF

68 °F (20 °C)

OFF

Breaker ON

30min.

Start operation

30min. 30min. 30min. 30min. 30min. 15min. 30min. 15min. 30min.

Stop operation

When outside temperature is above 68 °F (20 °C)

1. Pre-heat control is turned ON for 15 or 30 min. after the breaker is turned ON.

2. 30 min. after the unit is stopped, pre-heat control is turned ON for 15 or 30 min. and turned OFF for 30 min. This is repeated as shown in the graph until the breaker is turned OFF.

When outside temperature is 68 °F (20 °C) or below , pre-heat control is ON for 30 min.

When outside temperature is 70 °F (21 °C) or above, pre-heat control is ON for 15 min.

NOTE: When the unit is started with the remote controller, pre-heat control is turned OFF.

Compressor uses 50 W when pre-heat control is turned ON.

9-2. CHANGE IN DEFROST SETTING

Changing defrost finish temperature

1. Turn OFF the power supply for the air conditioner before making the setting.

2. Set the 4th Dip Switch of SW1 on the outdoor electronic control P.C. board to ON to change the defrost finish temperature. (Refer to 10-6-1.)

4th Dip Switch of SW1 Defrost ﬁ nish temperature

OFF

(Initial setting)

ON 64.9 °F (18.3 °C)

49.5 °F (9.7 °C)

1234

TROUBLESHOOTING

MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA

10-1. CAUTIONS ON TROUBLESHOOTING

1. Before troubleshooting, check the following

1) Check the power supply voltage.

2) Check the indoor/outdoor connecting wire for miswiring.

2. Take care of the following during servicing

1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, then after confirming the horizontal vane is closed, turn off the breaker and / or disconnect the power plug.

2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic control P.C. board.

3) When removing the electrical parts, be careful to the residual voltage of smoothing capacitor.

4) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the components.

5) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.

Lead wiring Housing point

3. Troubleshooting procedure

1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality.

To make sure, check how many times the abnormality indication is flashing on and off before starting service work.

2) Before servicing check that the connector and terminal are connected properly.

3) When the electronic control P.C. board seems to be defective, check the copper foil pattern for disconnection and the

components for bursting and discoloration.

4) Refer to 10-2. and 10-3.

10-2. FAILURE MODE RECALL FUNCTION

Outline of the function This air conditioner can memorize the abnormal condition which has occurred once. Even though LED indication listed on the troubleshooting check table (10-3.) disappears, the memorized failure details can be recalled. This mode is very useful when the unit needs to be repaired for the abnormality which doesn't recur.

1. Flow chart of failure mode recall function for the indoor/outdoor unit

Operational procedure

The cause of abnormality cannot be found because the abnormality doesn't recur.

Setting up the failure mode recall function

Turn ON the power supply. <Preparation of the remote controller>

While pressing both OPERATION SELECT button and TOO COOL button on the

remote controller at the same time, press RESET button.

First, release RESET button.

And release the other two buttons after all LCD in operation display section of the

remote controller is displayed after 3 seconds.

This figures show about MSZ type.

Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit.

Does the left lamp of OPERATION INDICATOR lamp on the indoor unit blink at the interval of 0.5 seconds? Blinks: Either indoor or outdoor unit is abnormal. Beep is emit-

ted at the same timing as the blinking of the left lamp of OPERATION INDICATOR lamp. 2

Yes

Judgment of indoor/outdoor abnormality

Releasing the failure mode recall function

Deleting the memorized abnormal condition

NOTE: 1. Make sure to release the failure mode recall function once it's set up, otherwise the unit cannot operate properly.

2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.

Before blinking, does the left lamp of OPERATION INDICATOR lamp stay ON for 3 seconds? Stays ON for 3 seconds (without beep): The outdoor unit is abnormal.

The indoor unit is abnormal. Check the blinking pattern, and conﬁ rm the abnormal point with the indoor unit failure mode table. (Refer to indoor unit service manual.) Make sure to check at least two consecutive blinking cycles.

Release the failure mode recall function by the following procedures. Turn OFF the power supply and turn it ON again. Press RESET button of the remote controller.

Repair the defective parts.

After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall

function" mentioned above.

Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed)

with the remote controller headed towards the indoor unit. Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted. Release the failure mode recall function according to "Releasing the failure mode recall function"

mentioned above.

(Blinks)

Indoor unit is normal. But the outdoor unit might be abnormal because there are some abnor-

No (OFF)

Yes

malities that can't be recalled with this way. Conﬁ rm if outdoor unit is abnormal according to the detailed outdoor unit failure mode recall function. (Refer to 10-2.2)

The outdoor unit is abnormal. Check the blinking pattern, and conﬁ rm the abnormal point with the outdoor unit failure mode table. (Refer to 10-2.3) Make sure to check at least two consecutive blinking cycles.

2. Blinking pattern when the indoor unit is abnormal:

2.5-second OFF

Blinking at 0.5second interval

2.5-second OFF

Blinking at 0.5-

second interval

OFF

Repeated cycle Repeated cycle

Beeps

Repeated cycle

1. Regardless of normal or abnormal condition, a short beep is emitted once the signal is received.

Beeps

3.Blinking pattern when the outdoor unit is abnormal:

2.5-second OFF 3-second ON

OFF

No beep Beeps

Repeated cycle

Blinking at 0.5second interval

2.5-second OFF 3-second ON

No beep Beeps

Repeated cycle

Blinking at 0.5second interval

Repeated cycle

2. Flow chart of the detailed outdoor unit failure mode recall function

Operational procedure

The outdoor unit might be abnormal. Conﬁ rm if outdoor unit is abnormal according to the following procedures.

Conﬁ rm that the remote controller is in the failure mode recall function.

With the remote controller headed towards the indoor unit, press TOO COOL or TOO WARM button to adjust the set temperature to 77 ˚F (25 ˚C).

Does left lamp of OPERATION INDICATOR lamp on the indoor unit blink at the interval of 0.5 seconds? Blinks: The outdoor unit is abnormal. Beep is emitted

at the same timing as the blinking of the left lamp of OPERATION INDICATOR lamp. 2

Yes

)

(Blinks

The outdoor unit is abnormal. Check the blinking pattern, and conﬁ rm the abnormal point with the out- door unit failure mode table. (10-2.3.) Make sure to check at least two consecutive blinking cycles.

Releasing the failure mode recall function

Release the failure mode recall function by the following procedures. Turn OFF the power supply and turn it ON again. Press RESET button of the remote controller.

Repair the defective parts.

Deleting the memorized abnormal condition

After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall

function" (10-2.1.).

Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed)

mentioned above.

NOTE: 1. Make sure to release the failure mode recall function once it's set up, otherwise the unit cannot operate properly.

2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.

No (OFF)

1. Regardless of normal or abnormal condition, 2 short beeps are emitted as the signal is received.

The outdoor unit is normal.

Release the failure mode recall function according to the left mentioned procedure.

2.Blinking pattern when outdoor unit is abnormal:

2.5-second OFF 3-second ON

OFF

No beep

Repeated cycle

Blinking at 0.5second interval

Beeps

2.5-second OFF 3-second ON

No beep Beeps

Repeated cycle

Blinking at 0.5-

second interval

Repeated cycle

3. Outdoor unit failure mode table

MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA

LED indication

The left lamp of OPERA-

TION INDICATOR lamp

(Indoor unit)

OFF Non (Normal) — — — — —

2-time ﬂ ash Outdoor power system Lighting Lighting

Abnormal point

(Failure mode / protection)

Discharge temperature thermistor Lighting Once

(Outdoor P.C.

board)

LED 1 LED 2

Condition Correspondence

IPM protection stop or lock protection stop is continuously performed 3 times within 1 minute after the compressor gets started, or converter protection stop or bus-bar voltage protection stop is continuously performed 3 times within 3 minutes after start-up.

•

Check the connection of the compressor connecting wire.

•

Refer to 10-5. inverter / compressor". Refer to 10-5. "Check of

• compressor start failure". Check the stop valve.

•

"How to check

Indoor/outdoor

unit failure mode

recall function

○

Defrost thermistor (MUZ) Lighting Once

3-time ﬂ ash

4-time ﬂ ash Overcurrent Once

5-time ﬂ ash Discharge temperature Lighting Lighting

6-time ﬂ ash High pressure Lighting Lighting

7-time ﬂ ash

8-time ﬂ ash Outdoor fan motor Lighting Lighting

9-time ﬂ ash Nonvolatile memory data Lighting 5 times Nonvolatile memory data cannot be read properly.

10-time ﬂ ash Discharge temperature Lighting Lighting

11-time ﬂ ash

Ambient temperature thermistor Lighting Twice

Fin temperature thermistor Lighting 3 times

P.C. board temperature thermistor Lighting 4 times

Outdoor heat exchanger temperature thermistor

Fin temperature 3 times

P.C. board temperature 4 times

Communication error between P.C. boards

Current sensor Lighting 7 times

Zero cross detecting circuit 5 times Goes out

Lighting 9 times

Goes

out

Goes

out

Goes

out

Lighting 6 times

Thermistor shorts or opens during compressor running.

28 A current ﬂ ow into intelligent power module.

Temperature of discharge temperature thermistor exceeds 241 °F (116 °C), compressor stops. Compressor can restart if discharge temperature thermistor reads 212 °F (100 °C) or less 3 minutes later.

The outdoor heat exchanger temperature exceeds 158 °F (70 °C) during cooling or the indoor gas pipe temperature exceeds 158 °F (70 °C) during heating (MUZ).

The ﬁ n temperature exceeds 189 °F (87 °C) during opera- tion.

The P.C. board temperature exceeds 158 °F (70 °C) during operation.

Failure occurs continuously 3 times within 30 seconds after the fan gets started.

The frequency of the compressor is kept 80 Hz or more and the discharge temperature is kept under 102 °F (39 °C) for more than 20 minutes.

Communication error occurs between the electronic control P.C. board and power board for more than 10 seconds.

The communication between boards protection stop is continuously performed twice.

A short or open circuit is detected in the current sensor during compressor operating.

Current sensor protection stop is continuously performed twice.

Zero cross signal cannot be detected while the compressor is operating.

The protection stop of the zero cross detecting circuit is continuously performed 10 times.

Refer to 10-5. "Check of

• outdoor thermistors".

Replace the outdoor electronic

• control P.C. board.

Refer to 10-5. "Check of

• outdoor thermistors".

Reconnect compressor con-

• nector. Refer to 10-5. "How to check

• inverter/ compressor." Refer to 10-5. "Check of

• compressor start failure". Check the stop valve.

•

Check refrigerant circuit and

• refrigerant amount. Refer to 10-5. "Check of

• LEV".

Check refrigerant circuit and

• refrigerant amount. Check the stop valve.

•

Check around outdoor unit.

• Check outdoor unit air pas-

• sage. Refer to 10-5. "Check of

• outdoor fan motor".

Refer to 10-5. "Check of

• outdoor fan motor".

Replace the outdoor electronic

• control P.C. board.

Check refrigerant circuit and

• refrigerant amount. Refer to 10-5. "Check of

• LEV".

Check the connecting wire

• between outdoor electronic control P.C. board and power board.

Replace the power board. •

Check the connecting wire

• among electronic control P.C. board, noise ﬁ lter P.C. board and power board.

○

—

○

—

○

—

○

—

○

NOTE : Blinking patterns of this mode differ from the ones of Troubleshooting check table (10-3.).

The left lamp of OPERA-

TION INDICATOR lamp

(Indoor unit)

LED indication (Out-

Abnormal point

(Failure mode / protection)

Converter 5 times Goes out

Bus-bar voltage (1)

door P.C. board)

LED 1 LED 2

5 times Goes out

Condition Correspondence

A failure is detected in the operation of the converter during operation.

The bus-bar voltage exceeds 400 V or falls to 200 V or below during compressor operating.

Indoor/outdoor

unit failure mode

recall function

Replace the power board. •

11-time ﬂ ash

Bus-bar voltage (2)

Even if this protection stop

is performed continuously 3 times, it does not mean the abnormality in outdoor power system.

6 times Goes out

The bus-bar voltage exceeds 400 V or falls to 50 V or below during compressor operating.

—

10-3. TROUBLESHOOTING CHECK TABLE

MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA

No. Symptom

2 Lightning 3 times

3 Lightning 4 times

Outdoor unit does not oper-

4 Lightning 5 times

ate.

5 Lightning 6 times Serial signal

6 Lightning 7 times Nonvolatile memory data The nonvolatile memory data cannot be read properly. Replace the outdoor electronic control P.C. board. •

7 Lightning 8 times Current sensor

8 Lightning 11 times

9 Lightning 12 times Zero cross detecting circuit

11 3 times Goes out

12 4 times Goes out

'Outdoor

13 5 times Goes out High-pressure protection

unit stops and restarts 3 minutes

14 8 times Goes out Converter protection

later' is repeated.

15 9 times Goes out

16 13 times Goes out Outdoor fan motor

17 Lighting 8 times Current sensor protection

18 Lighting 11 times

19 Lighting 12 times

NOTE 1. The location of LED is illustrated at the right figure. Refer to 10-6.1.

2. LED is lighted during normal operation.

Indication

LED1 (Red)

(Yellow)

Lightning Twice Outdoor power system

Twice Goes out

Abnormal point / Condition Condition Correspondence

LED2

Discharge temperature thermistor

Fin temperature thermistor

P.C. board temperature thermistor

Ambient temperature thermistor

Outdoor heat exchanger temperature thermistor

Defrost thermistor (MUZ)

Communication error between P.C. boards

IPM protection

Lock protection

Discharge temperature protection

Fin temperature protection The ﬁ n temperature exceeds 189 °F (87 °C) during operation.

P.C. board temperature protection

Bus-bar voltage protection (1)

Bus-bar voltage protection (2)

Communication between P.C. boards protection

Zero cross detecting circuit protection

IPM protection stop or lock protection stop is continuously performed three times within 1 minute after the compressor gets started, or converter protection stop or bus-bar voltage protection stop is continuously performed 3 times within 3 minutes after start-up.

A short circuit is detected in the thermistor during operation, or an open circuit is detected in the thermistor after 10 minutes of compressor start-up.

A short or open circuit is detected in the thermistor during operation.

A short circuit is detected in the thermistor during operation, or an open circuit is detected in the thermistor after 5 minutes (in cooling) and 10 minutes (in heating (MUZ)) of compressor start-up.

A short circuit is detected in the thermistor during operation, or an open circuit is detected in the thermistor after 5 minutes of compressor start-up.

The communication fails between the indoor and outdoor unit for 3 minutes.

Current sensor protection stop is continuously performed twice.

The communication protection stop between boards is continuously performed twice.

The protection stop of the zero cross detecting circuit is continuously performed 10 times.

Overcurrent is detected after 30 minutes of compressor startup.

Overcurrent is detected within 30 minutes of compressor start-up

The P.C. board temperature exceeds 158 °F (70 °C) during operation.

The outdoor heat exchanger temperature exceeds 158 °F (70 °C) during cooling or indoor gas pipe temperature exceeds 158 °F (70 °C) during heating (MUZ).

A failure is detected in the operation of the converter during operation.

The bus-bar voltage exceeds 400 V or falls to 200 V or below during compressor operating.

The bus-bar voltage exceeds 400 V or falls to 50 V or below during compressor operating.

Failure occurs continuously three times within 30 seconds after the fan gets started.

A short or open circuit is detected in the current sensor during compressor operating.

Communication error occurs between the outdoor electronic control P.C. board and power board for more than 10 seconds.

Zero cross signal cannot be detected while the compressor is operating.

Outdoor electronic control P.C. board(Parts side)

0.5-second ON

•

Check the connection of the compressor connecting wire.

•

Refer to 10-5. sor". Refer to 10-5. "Check of compressor start failure".

• Check the stop valve.

•

Refer to 10-5. "Check of outdoor thermistor". •

Replace the outdoor electronic control P.C. board. •

Refer to 10-5. "Check of outdoor thermistor".•

Refer to 10-5. "How to check miswiring and serial

• signal error.

Replace the power board. •

Check the connecting wire between outdoor elec-

• tronic control P.C. board and power board.

Check the connecting wire among outdoor elec-

• tronic control P.C. board, noise ﬁ lter P.C. board and power board.

•

Reconnect compressor connector.

•

Refer to 10-5. sor". Refer to 10-5. "Check of compressor start failure".

• Check the stop valve.

• Check the power module (PAM module).

•

Check the amount of gas and refrigerant circuit.

• Refer to 10-5. "Check of LEV".

•

Check refrigerant circuit and refrigerant amount.

• Refer to 10-5. "Check of LEV".

•

Check around of gas and the refrigerant circuit.

• Check of stop valve.

•

Replace the power board. •

Replace the power board.•

Refer to 10-5. "Check of outdoor fan motor". •

Replace the power board. •

Check the connecting wire between outdoor elec-

• tronic control P.C. board and power board.

Check the connecting wire among outdoor elec-

• tronic control P.C. board, noise ﬁ lter P.C. board and power board.

"How to check inverter/compres-

LED1

LED2

Lighting

OFF

2.5-second OFF

The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF. (Example) When the flashing frequency is “2”.

No. Symptom

21 Twice Lighting

22 3 times Lighting

Outdoor unit operates.

23 4 times Lighting

24 5 times Lighting

Outdoor unit operates

26 Lighting Lighting Normal – –

Indication

LED1 (Red)

(Yellow)

Once Lighting

9 times Lighting Inverter check mode The unit is operated with emergency operation switch. –

Abnormal point / Condition Condition Correspondence

LED2

Primary current protection The input current exceeds 15 A.

Secondary current protection The current of the compressor exceeds 15 A.

High-pressure protection (MUZ)

Defrosting in cooling

Discharge temperature protection

Low discharge temperature protection

Cooling high-pressure protection

The indoor gas pipe temperature exceeds 113 °F (45 °C) during heating.

The indoor gas pipe temperature falls 37 °F (3 °C) or below during cooling.

The discharge temperature exceeds 212 °F (100 °C) during operation.

The frequency of the compressor is kept 80 Hz or more and the discharge temperature is kept under 102 °F (39 °C) for more than 20 minutes.

The outdoor heat exchanger temperature exceeds 136 °F (58 °C) during operation.

These symptoms do not mean any abnormality of

• the product, but check the following points. Check if indoor ﬁ lters are clogged.

• Check if refrigerant is short.

• Check if indoor/outdoor unit air circulation is short

• cycled.

•

Check refrigerant circuit and refrigerant amount.

•

Refer to 10-5. Refer to 10-5. "Check of outdoor thermistors".

•

Refer to 10-5. "Check of LEV".

• Check refrigerant circuit and refrigerant amount.

•

This symptom does not mean any abnormality of

• the product, but check the following points. Check if indoor ﬁ lters are clogged.

• Check if refrigerant is short.

• Check if indoor/outdoor unit air circulation is short

• cycled.

"Check of LEV".

10-4. TROUBLE CRITERION OF MAIN PARTS

MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA

Part name Check method and criterion Figure

Defrost thermistor

(RT61) (MUZ)

Ambient temperature thermistor (RT65)

Outdoor heat exchanger temperature thermistor (RT68)

Discharge temperature thermistor (RT62)

Fin temperature thermistor (RT64)

Measure the resistance with a tester.

Refer to 10-6. “Test point diagram and voltage”, 1. “Outdoor electronic control P.C. board”, the chart of thermistor.

Measure the resistance with a tester. Before measurement, hold the thermistor with your hands to warm it up.

Refer to 10-6. “Test point diagram and voltage”, 1. “Outdoor electronic control P.C. board”, the chart of thermistor.

Compressor

Outdoor fan motor

R. V. coil (MUZ)

Linear expansion valve

Measure the resistance between terminals using a tester. (Winding temperature : 14 ~ 104 °F (-10 ~ 40 °C))

Normal

1.24 ~ 1.53 Ω

Measure the resistance between lead wires using a tester. (Part temperature : 14 ~ 104 °F (-10 ~ 40 °C))

Color of lead wire Normal

RED – BLK

13 ~ 16 ΩBLK – WHT

WHT – RED

Measure the resistance using a tester. (Part temperature : 14 ~ 104 °F (-10 ~ 40 °C))

Normal

1.20 ~ 1.55 kΩ

Measure the resistance using a tester. (Part temperature : 14 ~ 104 °F (-10 ~ 40 °C))

Color of lead wire Normal

WHT – RED

RED – ORN YLW – BRN

38 ~ 50 Ω

BRN – BLU

WHT

RED

ORN

RED

BLK

RED

(W)

WHT

(V)

BLK

(U)

LEV

YLW

BRN

BLU

10-5. TROUBLESHOOTING FLOW

OPERATION / INDICATOR lamp flashes 5-times. Outdoor unit does not operate.

A How to check inverter/ compressor

Disconnect the terminal of the compressor. 3 minutes after turning on the power supply, start EMERGENCY OPERATION.

Measure the voltage between each lead wire leading to the compressor. U (BLK) - V (WHT) V (WHT) - W (RED) W (RED) - U (BLK) Is voltage output on right table?

Yes

Is output balanced?

Yes

Is the input voltage to the outdoor electronic control P.C. board 370 V or more?

Yes

Turn off power supply of indoor and outdoor unit, and measure the compressor winding resistance between the compressor terminals. Is the resistance between each terminal normal?

Yes

•After the outdoor fan starts running, wait for 1 minute or more before measuring the voltage.

•The output voltage values have the tolerance of ±20 %.

Replace the power board.

Replace the compressor.

Reconnect the lead wire of compressor, and turn on power supply to indoor and outdoor unit. 3 minutes later, starts EMERGENCY OPERATION.

Clarify the causes by counting time until the inverter stops. 0 to 10 seconds: compressor rare short 10 to 60 seconds: compressor lock 60 seconds to 5 minutes: refrigerant circuit defective 5 minutes or more: normal

OPERATION INDICATOR lamp flashes 6-times. Thermistor is abnormal.

B Check of outdoor thermistors

Disconnect the connector of thermistor in the outdoor P.C. board (see below table), and measure the resistance of thermistor.

Is the thermistor normal? (Refer to 10-6.1.)

Yes

Reconnect the connector of thermistor. Turn ON the power supply and press EMERGENCY OPERATION switch.

Does the unit operate for 10 minutes or more without showing thermistor abnormality?

Yes

OK. (Cause is poor contact.)

Thermistor Symbol Connector, Pin No. Board

Defrost (MUZ) RT61 Between CN661 pin1 and pin2

Discharge temperature RT62 Between CN661 pin3 and pin4 Outdoor heat exchanger temperature RT68 Between CN661 pin7 and pin8 Ambient temperature RT65 Between CN663 pin1 and pin2 Fin temperature RT64 Between CN3 pin1 and pin2 Outdoor power board

Replace the thermistor except RT64. When RT64 is abnormal, replace the outdoor power board.

Replace the outdoor power board.

Outdoor electronic control P.C. board

The cooling operation or heating operation does not operate.

C Check of R.V. coil

MUZ-D30/36

Heating operation does not work.•

Disconnect the lead wire leading to the compressor.

1. 3 minutes after turning on the power supply, start EMERGENCY

2. OPERATION in HEAT mode.

Is there voltage of 208 / 230 VAC between pin1 and pin 2 at connector CN912?

Yes

Turn OFF power supply of indoor and outdoor unit.

Disconnect the connector CN912 in noise ﬁ lter P.C. board. Is there normal resistance to R.V. coil?

Yes

Replace the 4-way valve.

Cooling operation does not work.

•

Disconnect the lead wire leading to the compressor.

1. 3 minutes after turning on the power supply, start EMERGENCY

2. OPERATION in COOL mode.

Is there voltage of 208 / 230 VAC between pin1 and pin 2 at connector CN912?

Replace the R.V. coil.

Turn off power supply of indoor and outdoor unit, and discon-

1. nect the connector CN781 in the outdoor electronic control P.C. board. 3 minutes after turning ON the power supply, start EMER-

GENCY OPERATION in HEAT mode.

Is there voltage 12 VDC between the connector CN781 pin 5 (+) and pin 3 (-)?

Yes

Replace the noise ﬁ lter P.C. board.

If the connector CN912 is not

connected or R.V. coil is open, voltage occurs between terminals even when the control is OFF.

Replace the 4-way valve.

Replace the electronic

control P.C. board.

Turn OFF power supply of indoor and outdoor unit, and

1. disconnect the connector CN781 in the outdoor electronic control P.C. board.

3 minutes after turning ON the power supply, start EMER-

GENCY OPERATION in COOL mode.

Is there voltage 12 VDC between the connector CN781 pin 5 (+) and pin 3 (-)?

Yes

Replace the outdoor electronic control P.C. board.

Replace the noise ﬁ lter P.C. board.

Fan motor does not operate or stops operating shortly after starting the operation.

D Check of outdoor fan motor

Check the connection between the connector CN931 and CN932.

Is the resistance between each terminal of outdoor fan motor normal? (Refer to 10-4.)

Yes

Disconnect CN932 from outdoor electronic control P.C. board, and turn on the power supply.

Rotate the outdoor fan motor manually and measure the voltage of CN931. Between 1(+) and 5(-) Between 2(+) and 5(-) Between 3(+) and 5(-)

(Fixed to either 5 or 0 VDC)

Replace the outdoor DC fan motor. Replace the outdoor electronic control P.C. board.

Outdoor unit does not operate.

Does the voltage between each terminal become 5 VDC

and 0 VDC repeatedly?

Yes

Does the outdoor fan motor rotate smoothly?

Yes

E Check of power supply

Check the connecting of parts of main power supply circuit.

Turn ON power supply.

Is there voltage of 208 / 230 VAC in the power supply terminal block?

Yes

Is the output voltage from the noise ﬁ lter P.C. board 208 / 230 VAC?

Yes

Check the power supply cable.

Replace the noise ﬁ lter P.C. board.

Is the input voltage to the power board 208 / 230 VAC?

Yes

Is the input voltage to the outdoor electronic control P.C. board 294 / 325 VDC?

Yes

Replace the outdoor electronic control P.C. board.

Replace the reactor.

Replace the power board.

F Check of compressor start failure

Conﬁ rm that 1~4 is normal.

•Electrical circuit check Contact of lead wire leading to compressor

1. Output voltage of the outdoor electronic control P.C. board and balance of them

2. (See 10-5. ) Direct current voltage to the outdoor electronic control P.C. board

3. Voltage between outdoor terminal block S1-S2

Does the compressor run for 10 seconds or more after it starts?

Yes

Check the refrigerant circuit. Check the stop valve.

After the compressor is heated with a drier, does the compressor start? 1

Replace the compressor.

Yes

Compressor start failure. Activate pre-heat control. (Refer to 9-1. "PRE-HEAT CONTROL")

When cooling, heat exchanger of non-operating indoor unit frosts. When heating, non-operating indoor unit gets warm.

G Check of LEV

Turn ON power supply to the outdoor unit after checking LEV coil is mounted to the LEV body securely.

1 Heat the compressor with a drier for about 20 minutes. Do not recover refrigerant gas while heating.

Heating part

Is "click - click" sound heard? Or, do you feel vibration of the LEV coil with a hand?

Disconnect the connector CN795. Is there normal resistance to LEV coil?

Replace the LEV coil.

Yes

Normal

Replace the outdoor electronic control P.C. board.

• Unit cannot operate neither by the remote controller nor by EMERGENCY OPERATION switch. Indoor unit does not operate.

• OPERATION INDICATOR lamp flashes ON and OFF in every 0.5 seconds. Outdoor unit doesn’t operate.

H How to check miswiring and serial signal error

Turn OFF the power supply.

Outdoor electronic control P.C. board

Turn OFF inverter-controlled lighting

• equipment. Turn OFF the power supply and then

• turn ON again. Press EMERGENCY OPERATION

• switch.

Is serial signal error indicated 6 minutes later?

Yes

(Parts side)

LED1

LED2

•

BlinkingLighted

Reinstall either the unit or the light each other away. Attach a ﬁ lter on remote control receiving section of the indoor unit.

Is there rated voltage in the power supply?

Yes

Turn ON the power supply.

Is there rated voltage between outdoor terminal block S1 and S2?

Press EMERGENCY OPERATION switch once.

Does the left lamp of OPERATION INDICATOR lamp light up? <Conﬁ rmation of the power to the indoor unit>

Is serial signal error indicated 6 minutes later?

Turn OFF the power supply. Check once more if the indoor/outdoor

connecting wire is not miswiring. Short-circuit outdoor terminal block S2 and S3.

Turn ON the power supply.

Does the LED on the inverter P.C. board or the outdoor electronic control P.C. board repeat "3.6-second-OFF and 0.8-secondON quick blinking"? 3

Turn OFF the power supply. Remove the short-circuit between outdoor terminal block S2 and S3. Turn ON the power supply. Is there amplitude of 10 to 20 VDC between outdoor terminal block S2 and S3? <Conﬁ rmation of serial signal>

Is there rated voltage between indoor terminal block S1 and S2? <Conﬁ rmation of power voltage>

Replace the indoor electronic control P.C. board.

Be sure to release the failure-mode recall function after checking.

Yes

Check the power supply.

Check the wiring.

Is there any miswiring, poor contact, or wire disconnection of the indoor/outdoor

connecting wire? Is fuse (F65) broken?

1. Miswiring may damage indoor electronic control P.C. board during the operation.

Be sure to conﬁ rm the wiring is correct before the opera-

tion starts.

3. Be sure to check this within 3 minutes after turning ON. After 3 minutes, LED blinks 6 times. Even when the inverter P.C. board or the outdoor electronic control P.C. board is normal, LED blinks 6 times after 3 minutes.

Replace the inverter P.C. board or

No (Lighted or not lighted)

the outdoor electronic control P.C. board.

Is there any error of the indoor/outdoor connecting wire, such as the damage of the wire, intermediate connection, poor contact to the terminal block?

2. Be careful to the residual voltage of smoothing capacitor.

Correct them.

Yes

Replace the indoor/ outdoor connecting

Yes

wire.

Replace the indoor/ outdoor connecting

Yes

wire.

The operation frequency does not go up from lowest frequency.

I Check of HPS

1. Disconnect the connector CN681 in the electronic control P.C. board.

2. Check the resistance of HPS 1 minute after the outdoor unit power supply was turned OFF.

Check the resistance between each terminal.

0 Ω

Reconnect CN681. Turn ON power supply to the indoor and outdoor unit. 3 minutes later, start EMERGENCY OPERATION.

Is HPS protection displayed immediately after compressor starts?

Normal

Inﬁ nity

Yes

Replace HPS.

Replace the outdoor electronic control P.C. board.

J Electromagnetic noise enters into TV sets or radios

Is the unit grounded?

Yes

Is the distance between the antennas and the indoor unit within 9.91 ft., or is the distance between the antennas and the outdoor unit within 9.91 ft.?

Is the distance between the TV sets or radios and the indoor unit within 3.28 ft., or is the distance between the TV sets or radios and the outdoor unit within 9.91 ft.?

Are the antennas damaged? Is the coaxial cable damaged? Is there any poor contact in the antenna wiring?

Is the indoor/outdoor connecting wire of the air conditioner and the wiring of the antennas close?

Yes

Ground the unit.

Extend the distance between the antennas and the indoor unit, and/or the antennas and the outdoor unit.

Extend the distance between the TV sets and/or radios and the indoor unit, or the TV sets or radios and the outdoor unit.

Replace or repair the antenna. Replace or repair the coaxial cable.

Extend the distance between the indoor/outdoor connecting wire of the air conditioner and the wiring of the antennas.

Even if all of the above conditions are fulﬁ lled, the electromagnetic noise may enter, depending on the electric ﬁ eld strength or the installation condition (combination of speciﬁ c conditions such as antennas or wiring). Check the followings before asking for service.

1. Devices affected by the electromagnetic noise TV sets, radios (FM/AM broadcast, shortwave)

2. Channel, frequency, broadcast station affected by the electromagnetic noise

3. Channel, frequency, broadcast station unaffected by the electromagnetic noise

4. Layout of ; indoor/outdoor unit of the air conditioner, indoor/outdoor wiring, grounding wire, antennas, wiring from antennas, receiver

5. Electric ﬁ eld intensity of the broadcast station affected by the electromagnetic noise

6. Presence or absence of ampliﬁ er such as booster

7. Operation condition of air conditioner when the electromagnetic noise enters in

1) Turn OFF the power supply once, and then turn ON the power supply. In this situation, check for the electromagnetic noise.

2) Within 3 minutes after turning ON the power supply, press OPERATE/STOP (ON/OFF) button on the remote controller for power ON, and check for the electromagnetic noise.

3) After a short time (3 minutes later after turning ON), the outdoor unit starts running. During operation, check for the electromagnetic noise.

4) Press OPERATE/STOP (ON/OFF) button on the remote controller for power OFF, when the outdoor unit stops but the indoor/outdoor communication still runs on. In this situation, check for the electromagnetic noise.

10-6. TEST POINT DIAGRAM AND VOLTAGE

1. Outdoor electronic control P.C. board

MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA

Discharge temperature thermistor (RT62)

700

600

500

400

300

200

Resistance (kΩ)

100

32 50 68 86 104 122 140 176 194 122 212 230 248

Temperature (°F)

(

CN932

20-90 VAC

(

To fan

motor

5 VDC

(

CN931

pulse wave

Defrost thermistor (RT61)

GND

5 V

(MUZ) CN661

(

Outdoor heat exchanger temperature

Discharge temperature thermistor (RT62)

CN661

(

Fin temperature thermistor (RT64)

200

180

160

140

120

100

Resistance (kΩ)

32 50 68 86 104 122 140 158 176

CN663

CN702

(

CN701

Signal transmission

(To power board)

5 VDC pulse wave

(

thermistor (RT68) CN661

Ambient temperature

thermistor (RT65)

(

(–)

(+)

Temperature (°F)

Signal reception

(From power board)

5 VDC pulse wave

GND

(–)

12 V

(

(–)

15 V

GND (power board)

Rush current relay

Defrost thermistor (RT61) Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68)

100

Resistance (kΩ)

R.V. coil (–)

-4 14 32 50 68 86 104

Temperature (°F)

CN781

LEV

CN795

12 VDC

pulse wave

(

(–)

(+)

(

(+)

LED 1

LED 2

CN801

294 ~ 370

VDC Input

F801

FUSE

3.15 A / 250 V

CN601

(

208/230 VAC 60 Hz Input

(

CN681 High pressure switch

(

for indoor

5~10 VDC

2. Noise filter P.C. board

MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA

CN901

MUZ

CN912 R.V. coil 208 / 230 VAC 60 Hz Output

208 / 230 VAC 60 Hz Output

{

To electronic control P.C. board

{

CN902 To power board

CN903 To power board

{

208 / 230 VAC 60 Hz Input

F64 FUSE 2 A / 250 V

NR64 VARISTOR

{

CN61

3. Outdoor power board

MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA

Connect to the compressor Voltage among phases: 180 V

Connect to the earth

294-370 VDC Output

(+)

(–)

(Red)

(White)

CN2 Connect to the controller board (+)1-5(–): Signal transmission (To electronic control P.C. board) 5 VDC pulse wave (+)2-5(–): Zero cross signal 3-4 : Not used (+)6-5(–): 15 V (+)7-5(–): 15 V

CN3 Fin temperature thermistor RT64

Signal reception (From electronic

)

control P.C. board) 5 VDC pulse wave

CN5 Primary current detection (Connect to the noise filter)

DISASSEMBLY INSTRUCTIONS

<"Terminal with locking mechanism" Detaching points>

The terminal which has the locking mechanism can be detached as shown below. There are two types ( Refer to (1) and (2)) of the terminal with locking mechanism. The terminal without locking mechanism can be detached by pulling it out. Check the shape of the terminal before detaching.

(1) Slide the sleeve and check if there is a locking lever or not.

Sleeve

Slide the sleeve. Pull the terminal while

Locking lever

pushing the locking lever.

(2) The terminal with this connector has the locking mechanism.

MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA

OPERATING PROCEDURE PHOTOS

1. Removing the cabinet

(1) Remove the screws of the service panel. (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover. (4) Remove the service panel. (5) Remove the top panel. (6) Remove the valve cover. (7) Remove the screws of the cabinet. (8) Remove the cabinet. (9) Remove the screws of the back panel. (10)

Remove the back panel.

Photo 1

Screw of the top panel

Screws of the cabinet

Hold the sleeve, and pull out the terminal slowly.

Connector

Photo 3

Conduit plate

Screws of the back panel

Screw of the motor support

Set screws of the back panel

Screws of the cabinet

Photo 2

Screw of the service panel

Screws of the top panel

Set screws of the back panel

Screws of the cabinet

Screw of the valve cover

OPERATING PROCEDURE

PHOTOS

2. Removing the inverter assembly, P.C. board and power board

(1) Remove the top panel, cabinet, service panel and the back

panel. (Refer to 1.)

(2) Disconnect the following connectors;

CN931 and CN932 (Fan motor) CN795 (LEV) CN661 (Discharge temperature thermistor, defrost

thermistor (MUZ) and outdoor heat exchanger

temperature thermistor) CN663 (Ambient temperature thermistor) CN681 (High pressure switch) (MUZ)

CN912 (4-way valve) (MUZ)

<Reactor> (4) Remove the screws fixing the relay panel. (5) Remove the inverter assembly. (6) Disconnect all connectors and lead wires on the electronic

control P.C. board. (7) Remove the electronic control P.C. board from the inverter

assembly. (8) Remove the screws fixing the power board assembly. (9) Disconnect all connectors and lead wires on the power

board. (10)

Remove the power board from the inverter assembly.

(11)

Disconnect all connectors and lead wires on the noise filter

P.C. board. (12)

Remove the noise filter P.C. board from the inverter

assembly.

Photo 4

Screws of the reactor

HPS

Discharge temperature thermistor

Photo 5 (Inverter assembly)

Screws of the power board assembly

3. Removing R.V. coil (MUZ)

(1) Remove the top panel, cabinet, service panel and the back

panel. (Refer to 1.) (2) Disconnect the following connectors;

CN912 (4-way valve)

(3) Remove the R.V. coil. (Photo 9)

Screws of the relay panel

Photo 6

Screws of the relay panel

Propeller

OPERATING PROCEDURE

PHOTOS

4. Removing the defrost thermistor (MUZ), discharge temperature thermistor, outdoor heat exchanger temperature thermistor and ambient temperature thermistor

(1) Remove the top panel, cabinet, service panel and the back

panel. (Refer to 1.)

(2) Disconnect the following connectors;

CN661 (Discharge temperature thermistor, defrost therm-

istor (MUZ) and outdoor heat exchanger temperature thermistor)

CN663 (Ambient temperature thermistor) (3) Pull out the defrost thermistor from its holder. (Photo 7) (MUZ) (4) Pull out the discharge temperature thermistor from its hold-

er. (Photo 4)

(5) Pull out the outdoor heat exchanger temperature thermistor

from its holder. (Photo 7)

(6) Pull out the ambient temperature thermistor from its holder.

(Photo 7)

Photo 7

Outdoor heat exchanger temperature thermistor

Ambient temperature thermistor

Defrost thermistor (for MUZ)

5. Removing outdoor fan motor

(1) Remove the top panel, cabinet, service panel and the back

panel. (Refer to 1.)

(2) Disconnect the following connectors;

CN931 and CN932 (Fan motor) (3) Remove the propeller. (4) Remove the screws fixing the outdoor fan motor. (5) Remove the outdoor fan motor.

Photo 8

Propeller

Screws of the outdoor fan motor

OPERATING PROCEDURE

PHOTOS

6. Removing the compressor and 4-way valve

(1) Remove the top panel, cabinet, service panel and the back

panel. (Refer to 1.) (2) Remove the inverter assembly. (Refer to 2.) (3) Remove the R.V. coil. (Refer to 3.) (4) Recover gas from the refrigerant circuit.

NOTE: Recover gas from the pipes until the pressure

gauge shows 0 PSIG. (5) Detach the welded part of the suction and the discharge

pipe connected with compressor. (Photo 9) (6) Remove the compressor nuts. (7) Remove the compressor. (8) Detach the welded part of 4-way valve and pipe. (Photo 8)

Photo 9

Photo 10

Welded parts of 4-way valve

Welded part of the discharge pipe

R.V. coil

7. Removing the reactor

(1) Remove the top panel, cabinet, service panel and the back

panel. (Refer to 1.) (2) Disconnect the reactor lead wire. (3) Remove the screws of the reactor, and remove the reactor.

Welded part of the suction pipe

HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN

New publication, effective Feb. 2008 Specifications subject to change without notice.

Mitsubishi Electronics MUY-D36NA, U1, MUY-D30NA, MUZ-D30NA, MUZ-D36NA User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual