Mitsubishi MUZ-GC25VA-E1, MUZ-GC25VAH-E1, MUZ-GC35VA-E1, MUZ-GC35VAH-E1 Service Manual

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Page 1

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

HFC

utilized

R410A

OUTDOOR UNIT

SERVICE MANUAL

Wireless type Models

No. OBH469

MUZ-GC25VA -

MUZ-GC25VAH MUZ-GC35VA -

MUZ-GC35VAH -

MUZ-GC25VA MUZ-GC25VAH

Indoor unit service manual MSZ-GC•VA Series (OBH468)

CONTENTS

1. TECHNICAL CHANGES ····································2

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

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

4. NOISE CRITERIA CURVES·······························5

5. OUTLINES AND DIMENSIONS·························6

6. WIRING DIAGRAM ············································7

7. REFRIGERANT SYSTEM DIAGRAM··············11

8. PERFORMANCE CURVES······························13

9. ACTUA TOR CONTROL····································22

10. SERVICE FUNCTIONS·····································23

11. TROUBLESHOOTING ······································23

12. DISASSEMBLY INSTRUCTIONS·····················42

PARTS CATALOG (OBB469)

NOTE:

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

Page 2

Drain socket

MUZ-GC25VA

MUZ-GC35VA

TECHNICAL CHANGES

MUZ-GA25VA - ➔ MUZ-GC25VA MUZ-GA25VAH - ➔ MUZ-GC25VAH MUZ-GA35VA - ➔ MUZ-GC35VA MUZ-GA35VAH - ➔ MUZ-GC35VAH -

1.Outdoor model has been changed.

E1E3

PART NAMES AND FUNCTIONS

MUZ-GC25VA MUZ-GC25VAH

ACCESSORIES

Air inlet

Piping

Drain hose

Air outlet

Drain outlet

MUZ-GC35VA MUZ-GC35VAH

Air inlet

Piping

Drain hose

Air outlet

Drain outlet

Page 3

4.2

0.24

KNB065FDTH(C)

500

RA6V21-AB or BB

684o540o255

0.75

Cooling

2.5 (0.9-3.0)

1.4

1,812

3.6

665

3.14

3.76

810

Heating

3.2 (0.9-4.5) —

1,788

4.2

835

3.74

3.83

800

MUZ-GC25VA

5.0

KNB073FEDH or FGDH

550

RC0J50-AM

800o550o285

0.85

Cooling

3.5 (1.0-3.9)

2.0

2,010

5.0

1,075

4.47

0.31

3.26

810/750

Heating

4.0 (0.9-5.0) —

2,082

4.9

1,055

4.33

0.35

3.79

880/810/650

Outdoor model

Function

Power supply

Capacity Rated frequency(Min.-Max.) Dehumidification Air flow ✽1 Power outlet Running current ✽1

(Total)

Power input ✽1

(Total)

Power factor ✽1

(Total)

Starting current ✽1

(Total) Compressor motor current ✽1 Fan motor current ✽1

Model

Output Fan motor Model Dimensions WOHOD Weight Sound level ✽1 Fan speed Fan speed regulator Refrigerant filling capacity(R410A) Refrigeration oil (Model)

r/h

K /h

A W %

✽1

(Total)

dB(A)

rpm

kg cc

Compressor

Special

remarks

Coefficient of performance(C.O.P)

Capacity

Electrical

data

MUZ-GC35VA

MUZ-GC25VAH

MUZ-GC35VAH

Single phase

230V,50Hz

320 (NEO22)

SPECIFICATION

NOTE : Test conditions are based on ISO 5151

Cooling : Indoor Dry-bulb temperature 27:Wet-bulb temperature 19: Heating : Indoor Dry-bulb temperature 20: Refrigerant piping length (one way): 5m

✽1 Measured under rated operating frequency

Outdoor Dry-bulb temperature 35: Outdoor Dry-bulb temperature 7: Wet-bulb temperature 6:

Page 4

Model

Item

Current transformer Smoothing capacitor Diode module

Fuse

Defrost heater Intelligent power module Expansion valve coil Reactor Current-detecting resistor Current-limiting PTC thermistor Current-limiting resistor Terminal block Relay

R.V. coil Heater protector Outdoor fan motor thermal fuse IGBT

MUZ-GC25VA

(CT)

(CT761, CT781)

(C61,C62)

(

C63A, C63B, C63C

) (DB61) (DB65)

(DB61, DB65)

(F61)

(F701, F801)

(F71,F801,F901)

(H)

(IPM)

(LEV)

(L61)

(R61)

(R825,R831)

(PTC64)

(

R64A, R64B

)

(TB1,TB2)

(X61) (X63) (X64) (X66)

(21S4)

(26H)

(TR821)

MUZ-GC25VAH

MUZ-GC35VA

MUZ-GC35VAH

20A

—

620+ 420V

— —

25A 600V

—

T3.15AL250V

15A 600V

10A 23.0mH

—

10" 5W

—

STF-01AJ503

—

230V 130W

3A 250V

Open 45:

—

230V 138W

3A 250V

Open 45:

20A

T20AL250V

CAM-MD12ME 12VDC

45m" 5W 25m" 5W

3A 250V

20A 250V

3A 600V

—

500+ 420V

—

15A 600V 10A 600V

—

T3.15AL250V

—

10A 600V

7A 18.0mH

33"

—

2A 240V

SHF-4-10W5

Open 152: (RA6V21-AB) or Open 126: (RA6V21-BB)

Specifications and rating conditions of main electric parts

Page 5

63 125 250 500 1000 2000 4000 8000

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE

COOLING

FUNCTION

SPL(dB(A)) LINE

HEATING

46 47

63 125 250 500 1000 2000 4000 8000

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE

COOLING

FUNCTION

SPL(dB(A))

LINE

HEATING

47 48

Test conditions Cooling : Dry-bulb temperature 35:

Heating : Dry-bulb temperature 7: Wet-bulb temperature 6:

OUTDOOR UNIT

MICROPHONE

NOISE CRITERIA CURVES

MUZ-GC25VA MUZ-GC25VAH

MUZ-GC35VA MUZ-GC35VAH

Page 6

20.8

144.6

89.6

255

145.5

Service panel

Service port

Air out

Liquid refrigerant pipe joint Refrigerant pipe (flared) [6.35

Gas refrigerant pipe joint Refrigerant pipe (flared) [9.52

43-

40-

REQUIRED SPACE

Basically open 100 mm or more without any obstruction in front and on both sides of the unit.

350 mm or more

100 mm or more

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

Air in

381.5

Drain hole

[33 (Only MUZ-GC25VA)

Bolt pitch for

installation

264~280

300

540

270

47.5

22.5

17.5

243

Bolt pitch for installation

500

684

105

Handle

2 holes 10 X 16

800

302.5 500 Bolt pitch for installation

150

22.3

Handle

550

280

164.5

99.5

170.5

Service panel

Service port

285

344.5

400

Air in

Air out

Air in

17.5

Bolt pitch for

installation

304~325

Liquid refrigerant pipe joint Refrigerant pipe (flared) [6.35

Gas refrigerant pipe joint Refrigerant pipe (flared) [9.52

43-

35-

2 holes 10 X 21

Drain hole [33 (MUZ-GC35VAH)

REQUIRED SPACE

Basically open 100 mm or more without any obstruction in front and on both sides of the unit.

350 mm or more

200 mm or more

100 mm or more

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

Drain hole [42 (MUZ-GC35VA)

OUTLINES AND DIMENSIONS

MUZ-GC25VA MUZ-GC25VAH

Unit: mm

MUZ-GC35VA MUZ-GC35VAH

Page 7

MUZ-GC25VA

WIRING DIAGRAM

Page 8

MUZ-GC25VAH

Page 9

MUZ-GC35VA

Page 10

MUZ-GC35VAH

Page 11

Outdoor heat exchanger

Flared connection

Defrost thermistor RT61

Discharge temperature thermistor RT62

Flared connection

Stop valve (with strainer)

Stop valve (with service port)

Capillary tube [3.0✕[2.0✕260

Refrigerant flow in cooling

Compressor

4-way valve

Refrigerant flow in heating

Refrigerant pipe [9.52 (with heat insulator)

Refrigerant pipe [6.35 (with heat insulator)

Expansion valve

R.V. coil heating ON cooling OFF

Strainer #100

Ambient temperature thermistor RT65

Muffler

Outdoor heat exchanger

Flared connection

Defrost thermistor RT61

Discharge temperature thermistor RT62

Flared connection

Stop valve (with strainer)

Stop valve (with service port)

Capillary tube [3.0✕[2.0✕240

Refrigerant flow in cooling

Compressor

4-way valve

Refrigerant flow in heating

Refrigerant pipe [9.52 (with heat insulator)

Refrigerant pipe [6.35 (with heat insulator)

Expansion valve

R.V. coil heating ON cooling OFF

Strainer #100

Muffler

Ambient temperature thermistor RT65

Muffler

REFRIGERANT SYSTEM DIAGRAM

MUZ-GC25VA MUZ-GC25VAH

Unit:mm

MUZ-GC35VA MUZ-GC35VAH

Page 12

Outdoor unit

precharged

750

850

14m7m6m5m 11m

Model

Refrigerant piping length (one way)

10m

12m 13m 15m 20m

27000

180

120

150

210 240 300 450

MUZ-GC25VA MUZ-GC25VAH MUZ-GC35VA MUZ-GC35VAH

Max. length A

Max. Height

difference

Indoor unit

Outdoor unit

MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE

Max. length

Max. Height difference

Model

Gas

9.52

Liquid

6.35

Piping size O.D : mm

Refrigerant piping : m

MUZ-GC25VA MUZ-GC25VAH

MUZ-GC35VA MUZ-GC35VAH

ADDITIONAL REFRIGERANT CHARGE (R410A:g)

Calculation : Xg=30 g/m ✕ (Refrigerant piping length (m)–5)

NOTE: Refrigerant piping exceeding 7 m requires additional refrigerant charge according to the calculation.

Page 13

8 PERFORMANCE CURVES

MUZ-GC25VA MUZ-GC35VA MUZ-GC25VAH MUZ-GC35VAH

The standard data contained in these specifications apply only to the operation of the air conditioner under normal conditions. Since operating conditions vary according to the areas where these units are installed, the following information has been provided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.

(1) GUARANTEED VOLTAGE

198 ~ 264V, 50Hz

(2) AIR FLOW

Air flow should be set at MAX.

(3) MAIN READINGS

(1) Indoor intake air wet-bulb temperature : °C WB (2) Indoor outlet air wet-bulb temperature : °C WB (3) Outdoor intake air dry-bulb temperature : °C DB (4) Total input: W (5) Indoor intake air dry-bulb temperature : °C DB (6) Outdoor intake air wet-bulb temperature : °C WB (7) Total input : W Indoor air wet/dry-bulb temperature difference on the left side of the following chart shows the difference between the indoor intake air wet/dry-bulb temperature and the indoor outlet air wet/dry-bulb temperature for your reference at service.

How to measure the indoor air wet-bulb / dry-bulb temperature difference

1. Attach at least 2 sets of wet and dry-bulb thermometers to the indoor air intake as shown in the figure, and at least 2 sets of wet and dry-bulb thermometers to the indoor air outlet. The thermometers must be attached to the position where air speed is high.

2. Attach at least 2 sets of wet and dry-bulb thermometers to the outdoor air intake. Cover the thermometers to prevent direct rays of the sun.

3. Check that the air filter is cleaned.

4. Open windows and doors of room.

5. Press the EMERGENCY OPERATION switch once (twice) to start the EMERGENCY COOL (HEAT) MODE.

6. When system stabilizes after more than 15 minutes, measure temperature and take an average temperature.

7. 10 minutes later, measure temperature again and check that the temperature does not change.

}

Cooling

Heating

INDOOR UNIT

Wet and dry-bulb thermometers

8-1. Capacity and input curves

1.5

12.7

8.1

1.4

11.6

7.5

10.6

6.8

6.3

5.7

5.1

difference (degree)

4.5

Indoor air Wet-bulb temperature

1.3

9.6

1.2

8.7

1.1

7.8

1.0

6.9

0.9

Capacity correction factor

18 20 25 30 35 40 46

Indoor intake air Wet-bulb temperature (:)

OUTDOOR UNIT

Wet and dry-bulb thermometers

Cooling capacity

22 20 18

at Rated frequency

MUZ-GC35VA

MUZ-GC25VAH

MUZ-GC25VA

MUZ-GC35VAH

Page 14

Indoor air Wet-bulb temperature

difference (degree)

MUZ-GC25VAH

6.8

6.3

5.7

5.1

4.5

4.0

10.6

9.6

8.7

7.8

6.9

6.0

MUZ-GC35VAH

MUZ-GC25VA

MUZ-GC35VA

at Rated frequency

input correction factor

Outdoor intake air Dry-bulb temperature (:)

18 20 25 30 35 40 46

0.8

0.9

1.0

1.1

1.2

1.3

Total input (cooling)

20 18

Indoor intake air Wet-bulb temperature (

20.9

19.3

17.7

16.1

14.5

12.9

11.3

9.7

8.0

6.4

27.5

25.4

23.3

21.2

19.1

16.9

14.8

12.7

10.6

8.5

Indoor air Dry-bulb temperature

difference (degree)

at Rated frequency

MUZ-GC35VAH

MUZ-GC25VAH

MUZ-GC35VA

MUZ-GC25VA

Outdoor intake air Wet-bulb temperature (:)

-20 -15 -10 -5 0 5 10 15

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

Heating capacity

Capacity correction factor

15 20 26

Indoor intake air Dry-bulb tem

perature (

)

20.9

19.3

17.7

16.1

14.5

12.9

11.3

9.7

8.0

6.4

27.5

25.4

23.3

21.2

19.1

16.9

14.8

12.7

10.6

8.5

Indoor air Dry-bulb temperature

difference (degree)

at Rated frequency

MUZ-GC35VAH

MUZ-GC25VAH

MUZ-GC35VA

MUZ-GC25VA

Outdoor intake air Wet-bulb temperature (:)

-20 -15 -10 -5 0 5 10 15

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

Total input(heating)

Input correction factor

Indoor intake air Dry-bulb temperature (

NOTE:The above broken lines are for the heating operation without any frost and

defrost operation.

Page 15

8-2. Capacity and input correction by operational frequency of compressor

MUZ-GC25VA MUZ-GC25VAH

Correction of Cooling capacity

1.5

Correction of Cooling total input

1.5

Correction of Heating capacity

2.0

Correction of Heating total input

2.0

1.0

0.5

Capacity correction factors

0.0 0 50 100 150(Hz)

The operational frequency of compressor

MUZ-GC35VA MUZ-GC35VAH

Correction of Cooling capacity

1.5

1.0

0.5

Capacity correction factors

0.0 0 50 100 150(Hz)

The operational frequency of compressor

1.0

0.5

Input correction factors

0.0 0 50 100 150(Hz)

The operational frequency of compressor

Correction of Cooling total input

1.5

1.0

0.5

Input correction factors

0.0

0 50 100 150(Hz)

The operational frequency of compressor

1.5

1.0

0.5

Capacity correction factors

0.0 0 50 100 150(Hz)

The operational frequency of compressor

Correction of Heating capacity

2.0

1.5

1.0

0.5

Capacity correction factors

0.0 0 50 100 150(Hz)

The operational frequency of compressor

1.5

1.0

0.5

Input correction factors

0.0 0 50 100 150(Hz)

The operational frequency of compressor

Correction of Heating total input

2.0

1.5

1.0

0.5

Input correction factors

0.0 0 50 100 150(Hz)

The operational frequency of compressor

8-3. 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 58Hz 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.

Page 16

kgf/F [Gauge]

MPa [Gauge]

3215 2050256030

70 (%)

35(˚C)

3230

70 (%)

35(˚C)

0.2

0.4

0.6

0.8

1.0

1.2

1.4

Ambient temperature(˚C) Ambient humidity(%)

Outdoor low pressure

MUZ-GC25VAH

Ambient temperature(˚C) Ambient humidity(%)

15 205025

MUZ-GC25VAH

MUZ-GC25VA

MUZ-GC35VAH

MUZ-GC35VA

kgf/F [Gauge]

MPa [Gauge]

0.2

0.4

0.6

0.8

1.0

1.2

1.4

15 205025

2.5

3.5

(A) (A)

Outdoor unit current

Ambient temperature(˚C) Ambient humidity(%)

3215 2050256030

70 (%)

35(˚C)

3230

70 (%)

35(˚C)

(A) (A)

Ambient temperature(˚C)

MUZ-GC25VAH

MUZ-GC25VA

MUZ-GC35VAH

MUZ-GC35VA

Outdoor unit current

3.0

2.5

2.0

1.5

1.0

0.5

0.0 2

5 10 15 20 25(:)

3.0

2.5

2.0

1.5

1.0

0.5

0.0 2

5 10 15 20 25(:)

8-4. Outdoor low pressure and outdoor unit current

Dry bulb temperature (°C)

Indoor

20.0

14.521

Outdoor 7 6

151220.0

14.5

Wet bulb temperature (°C)

COOL operation

1 Both indoor and outdoor unit are under the

same temperature/humidity condition.

2 Operation : TEST RUN OPERATION (refer to 8-3.)

Dry-bulb temperature(:)

20 25 30 70

NOTE : The unit of pressure has been changed to MPa on the international system of units (SI unit system). The conversion factor is:

1(MPa [Gauge]) =10.2(kgf/ [Gauge])

Relative humidity(%)

50 60

HEAT operation

1 Condition :

2 Operation : Test run operation (refer to 8-3.)

Page 17

21 18 21 20 22 18 22 20 22 22 23 18 23 20 23 22 24 18 24 20 24 22 24 24 25 18 25 20 25 22 25 24 26 18 26 20 26 22 26 24 26 26 27 18 27 20 27 22 27 24 27 26 28 18 28 20 28 22 28 24 28 26 29 18 29 20 29 22 29 24 29 26 30 18 30 20 30 22 30 24 30 26 31 18 31 20 31 22 31 24 31 26 32 18 32 20 32 22 32 24 32 26

INDOOR INDOOR

CAPACITY:2.5(kW)

INPUT:665(W)SHF:0.79

OUTDOOR DB(:)

25 27 30

WB(:)

Q SHC SHF Q SHC SHF Q SHC SHF Q SHC SHFINPUT INPUT INPUT INPUT

DB(:)

2.94 1.79 0.61 532 2.81 1.72 0.61 559 2.70 1.65 0.61 585 2.60 1.59 0.61 612

3.06 1.50 0.49 559 2.94 1.44 0.49 592 2.85 1.40 0.49 605 2.75 1.35 0.49 632

2.94 1.91 0.65 532 2.81 1.83 0.65 559 2.70 1.76 0.65 585 2.60 1.69 0.65 612

3.06 1.62 0.53 559 2.94 1.56 0.53 592 2.85 1.51 0.53 605 2.75 1.46 0.53 632

3.19 1.31 0.41 579 3.08 1.26 0.41 615 3.00 1.23 0.41 632 2.88 1.18 0.41 658

2.94 2.03 0.69 532 2.81 1.94 0.69 559 2.70 1.86 0.69 585 2.60 1.79 0.69 612

3.06 1.75 0.57 559 2.94 1.67 0.57 592 2.85 1.62 0.57 605 2.75 1.57 0.57 632

3.19 1.43 0.45 579 3.08 1.38 0.45 615 3.00 1.35 0.45 632 2.88 1.29 0.45 658

2.94 2.14 0.73 532 2.81 2.05 0.73 559 2.70 1.97 0.73 585 2.60 1.90 0.73 612

3.06 1.87 0.61 559 2.94 1.79 0.61 592 2.85 1.74 0.61 605 2.75 1.68 0.61 632

3.19 1.56 0.49 579 3.08 1.51 0.49 615 3.00 1.47 0.49 632 2.88 1.41 0.49 658

3.35 1.24 0.37 605 3.23 1.19 0.37 638 3.15 1.17 0.37 658 3.05 1.13 0.37 692

2.94 2.26 0.77 532 2.81 2.17 0.77 559 2.70 2.08 0.77 585 2.60 2.00 0.77 612

3.06 1.99 0.65 559 2.94 1.91 0.65 592 2.85 1.85 0.65 605 2.75 1.79 0.65 632

3.19 1.69 0.53 579 3.08 1.63 0.53 615 3.00 1.59 0.53 632 2.88 1.52 0.53 658

3.35 1.37 0.41 605 3.23 1.32 0.41 638 3.15 1.29 0.41 658 3.05 1.25 0.41 692

2.94 2.38 0.81 532 2.81 2.28 0.81 559 2.70 2.19 0.81 585 2.60 2.11 0.81 612

3.06 2.11 0.69 559 2.94 2.03 0.69 592 2.85 1.97 0.69 605 2.75 1.90 0.69 632

3.19 1.82 0.57 579 3.08 1.75 0.57 615 3.00 1.71 0.57 632 2.88 1.64 0.57 658

3.35 1.51 0.45 605 3.23 1.45 0.45 638 3.15 1.42 0.45 658 3.05 1.37 0.45 692

3.45 1.14 0.33 638 3.35 1.11 0.33 672 3.30 1.09 0.33 692 3.20 1.06 0.33 712

2.94 2.50 0.85 532 2.81 2.39 0.85 559 2.70 2.30 0.85 585 2.60 2.21 0.85 612

3.06 2.24 0.73 559 2.94 2.14 0.73 592 2.85 2.08 0.73 605 2.75 2.01 0.73 632

3.19 1.94 0.61 579 3.08 1.88 0.61 615 3.00 1.83 0.61 632 2.88 1.75 0.61 658

3.35 1.64 0.49 605 3.23 1.58 0.49 638 3.15 1.54 0.49 658 3.05 1.49 0.49 692

3.45 1.28 0.37 638 3.35 1.24 0.37 672 3.30 1.22 0.37 692 3.20 1.18 0.37 712

2.94 2.61 0.89 532 2.81 2.50 0.89 559 2.70 2.40 0.89 585 2.60 2.31 0.89 612

3.06 2.36 0.77 559 2.94 2.26 0.77 592 2.85 2.19 0.77 605 2.75 2.12 0.77 632

3.19 2.07 0.65 579 3.08 2.00 0.65 615 3.00 1.95 0.65 632 2.88 1.87 0.65 658

3.35 1.78 0.53 605 3.23 1.71 0.53 638 3.15 1.67 0.53 658 3.05 1.62 0.53 692

3.45 1.41 0.41 638 3.35 1.37 0.41 672 3.30 1.35 0.41 692 3.20 1.31 0.41 712

2.94 2.73 0.93 532 2.81 2.62 0.93 559 2.70 2.51 0.93 585 2.60 2.42 0.93 612

3.06 2.48 0.81 559 2.94 2.38 0.81 592 2.85 2.31 0.81 605 2.75 2.23 0.81 632

3.19 2.20 0.69 579 3.08 2.12 0.69 615 3.00 2.07 0.69 632 2.88 1.98 0.69 658

3.35 1.91 0.57 605 3.23 1.84 0.57 638 3.15 1.80 0.57 658 3.05 1.74 0.57 692

3.45 1.55 0.45 638 3.35 1.51 0.45 672 3.30 1.49 0.45 692 3.20 1.44 0.45 712

2.94 2.85 0.97 532 2.81 2.73 0.97 559 2.70 2.62 0.97 585 2.60 2.52 0.97 612

3.06 2.60 0.85 559 2.94 2.50 0.85 592 2.85 2.42 0.85 605 2.75 2.34 0.85 632

3.19 2.33 0.73 579 3.08 2.24 0.73 615 3.00 2.19 0.73 632 2.88 2.10 0.73 658

3.35 2.04 0.61 605 3.23 1.97 0.61 638 3.15 1.92 0.61 658 3.05 1.86 0.61 692

3.45 1.69 0.49 638 3.35 1.64 0.49 672 3.30 1.62 0.49 692 3.20 1.57 0.49 712

2.94 2.97 1.01 532 2.81 2.84 1.01 559 2.70 2.73 1.01 585 2.60 2.63 1.01 612

3.06 2.73 0.89 559 2.94 2.61 0.89 592 2.85 2.54 0.89 605 2.75 2.45 0.89 632

3.19 2.45 0.77 579 3.08 2.37 0.77 615 3.00 2.31 0.77 632 2.88 2.21 0.77 658

3.35 2.18 0.65 605 3.23 2.10 0.65 638 3.15 2.05 0.65 658 3.05 1.98 0.65 692

3.45 1.83 0.53 638 3.35 1.78 0.53 672 3.30 1.75 0.53 692 3.20 1.70 0.53 712

2.94 3.08 1.05 532 2.81 2.95 1.05 559 2.70 2.84 1.05 585 2.60 2.73 1.05 612

3.06 2.85 0.93 559 2.94 2.73 0.93 592 2.85 2.65 0.93 605 2.75 2.56 0.93 632

3.19 2.58 0.81 579 3.08 2.49 0.81 615 3.00 2.43 0.81 632 2.88 2.33 0.81 658

3.35 2.31 0.69 605 3.23 2.23 0.69 638 3.15 2.17 0.69 658 3.05 2.10 0.69 692

3.45 1.97 0.57 638 3.35 1.91 0.57 672 3.30 1.88 0.57 692 3.20 1.82 0.57 712

PERFORMANCE DATA COOL operation at Rated frequency

MUZ-GC25VA MUZ-GC25VAH

NOTE: Q : Total capacity (kW) SHF : Sensible heat factor DB : Dry-bulb temperature

SHC : Sensible heat capacity (kW) INPUT : Total power input (W) WB : Wet-bulb temperature

Page 18

35 40 46

CAPACITY:2.5(kW)

INPUT:665(W)SHF:0.79

OUTDOOR DB(:)

INDOOR INDOOR

DB (:) WB (:)

Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT

2.45 1.49 0.61 652 2.25 1.37 0.61 692 2.08 1.27 0.61 718

2.58 1.26 0.49 678 2.40 1.18 0.49 712 2.23 1.09 0.49 751

2.45 1.59 0.65 652 2.25 1.46 0.65 692 2.08 1.35 0.65 718

2.58 1.36 0.53 678 2.40 1.27 0.53 712 2.23 1.18 0.53 751

2.73 1.12 0.41 705 2.55 1.05 0.41 745 2.38 0.97 0.41 771

2.45 1.69 0.69 652 2.25 1.55 0.69 692 2.08 1.43 0.69 718

2.58 1.47 0.57 678 2.40 1.37 0.57 712 2.23 1.27 0.57 751

2.73 1.23 0.45 705 2.55 1.15 0.45 745 2.38 1.07 0.45 771

2.45 1.79 0.73 652 2.25 1.64 0.73 692 2.08 1.51 0.73 718

2.58 1.57 0.61 678 2.40 1.46 0.61 712 2.23 1.36 0.61 751

2.73 1.34 0.49 705 2.55 1.25 0.49 745 2.38 1.16 0.49 771

2.88 1.06 0.37 732 2.70 1.00 0.37 765 2.55 0.94 0.37 798

2.45 1.89 0.77 652 2.25 1.73 0.77 692 2.08 1.60 0.77 718

2.58 1.67 0.65 678 2.40 1.56 0.65 712 2.23 1.45 0.65 751

2.73 1.44 0.53 705 2.55 1.35 0.53 745 2.38 1.26 0.53 771

2.88 1.18 0.41 732 2.70 1.11 0.41 765 2.55 1.05 0.41 798

2.45 1.98 0.81 652 2.25 1.82 0.81 692 2.08 1.68 0.81 718

2.58 1.78 0.69 678 2.40 1.66 0.69 712 2.23 1.54 0.69 751

2.73 1.55 0.57 705 2.55 1.45 0.57 745 2.38 1.35 0.57 771

2.88 1.29 0.45 732 2.70 1.22 0.45 765 2.55 1.15 0.45 798

3.03 1.00 0.33 758 2.85 0.94 0.33 791 2.68 0.88 0.33 825

2.45 2.08 0.85 652 2.25 1.91 0.85 692 2.08 1.76 0.85 718

2.58 1.88 0.73 678 2.40 1.75 0.73 712 2.23 1.62 0.73 751

2.73 1.66 0.61 705 2.55 1.56 0.61 745 2.38 1.45 0.61 771

2.88 1.41 0.49 732 2.70 1.32 0.49 765 2.55 1.25 0.49 798

3.03 1.12 0.37 758 2.85 1.05 0.37 791 2.68 0.99 0.37 825

2.45 2.18 0.89 652 2.25 2.00 0.89 692 2.08 1.85 0.89 718

2.58 1.98 0.77 678 2.40 1.85 0.77 712 2.23 1.71 0.77 751

2.73 1.77 0.65 705 2.55 1.66 0.65 745 2.38 1.54 0.65 771

2.88 1.52 0.53 732 2.70 1.43 0.53 765 2.55 1.35 0.53 798

3.03 1.24 0.41 758 2.85 1.17 0.41 791 2.68 1.10 0.41 825

2.45 2.28 0.93 652 2.25 2.09 0.93 692 2.08 1.93 0.93 718

2.58 2.09 0.81 678 2.40 1.94 0.81 712 2.23 1.80 0.81 751

2.73 1.88 0.69 705 2.55 1.76 0.69 745 2.38 1.64 0.69 771

2.88 1.64 0.57 732 2.70 1.54 0.57 765 2.55 1.45 0.57 798

3.03 1.36 0.45 758 2.85 1.28 0.45 791 2.68 1.20 0.45 825

2.45 2.38 0.97 652 2.25 2.18 0.97 692 2.08 2.01 0.97 718

2.58 2.19 0.85 678 2.40 2.04 0.85 712 2.23 1.89 0.85 751

2.73 1.99 0.73 705 2.55 1.86 0.73 745 2.38 1.73 0.73 771

2.88 1.75 0.61 732 2.70 1.65 0.61 765 2.55 1.56 0.61 798

3.03 1.48 0.49 758 2.85 1.40 0.49 791 2.68 1.31 0.49 825

2.45 2.47 1.01 652 2.25 2.27 1.01 692 2.08 2.10 1.01 718

2.58 2.29 0.89 678 2.40 2.14 0.89 712 2.23 1.98 0.89 751

2.73 2.10 0.77 705 2.55 1.96 0.77 745 2.38 1.83 0.77 771

2.88 1.87 0.65 732 2.70 1.76 0.65 765 2.55 1.66 0.65 798

3.03 1.60 0.53 758 2.85 1.51 0.53 791 2.68 1.42 0.53 825

2.45 2.57 1.05 652 2.25 2.36 1.05 692 2.08 2.18 1.05 718

2.58 2.39 0.93 678 2.40 2.23 0.93 712 2.23 2.07 0.93 751

2.73 2.21 0.81 705 2.55 2.07 0.81 745 2.38 1.92 0.81 771

2.88 1.98 0.69 732 2.70 1.86 0.69 765 2.55 1.76 0.69 798

3.03 1.72 0.57 758 2.85 1.62 0.57 791 2.68 1.52 0.57 825

PERFORMANCE DATA COOL operation at Rated frequency

MUZ-GC25VA MUZ-GC25VAH

NOTE: Q : Total capacity (kW) SHF : Sensible heat factor DB : Dry-bulb temperature

SHC : Sensible heat capacity (kW) INPUT : Total power input (W) WB : Wet-bulb temperature

Page 19

PERFORMANCE DATA COOL operation at Rated frequency

MUZ-GC35VA MUZ-GC35VAH

CAPACITY:3.5(kW)

INDOOR INDOOR

DB(:)

NOTE: Q : Total capacity (kW) SHF : Sensible heat factor DB : Dry-bulb temperature

WB(:)

SHC : Sensible heat capacity (kW) INPUT : Total power input (W) WB : Wet-bulb temperature

Q SHC SHF Q SHC SHF Q SHC SHF Q SHC SHFINPUT INPUT INPUT INPUT

4.11 2.39 0.58 860 3.94 2.28 0.58 903 3.78 2.19 0.58 946 3.64 2.11 0.58 989

4.29 1.97 0.46 903 4.11 1.89 0.46 957 3.99 1.84 0.46 978 3.85 1.77 0.46 1021

4.11 2.55 0.62 860 3.94 2.44 0.62 903 3.78 2.34 0.62 946 3.64 2.26 0.62 989

4.29 2.14 0.50 903 4.11 2.06 0.50 957 3.99 2.00 0.50 978 3.85 1.93 0.50 1021

4.46 1.70 0.38 935 4.31 1.64 0.38 994 4.20 1.60 0.38 1021 4.03 1.53 0.38 1064

4.11 2.71 0.66 860 3.94 2.60 0.66 903 3.78 2.49 0.66 946 3.64 2.40 0.66 989

4.29 2.32 0.54 903 4.11 2.22 0.54 957 3.99 2.15 0.54 978 3.85 2.08 0.54 1021

4.46 1.87 0.42 935 4.31 1.81 0.42 994 4.20 1.76 0.42 1021 4.03 1.69 0.42 1064

4.11 2.88 0.70 860 3.94 2.76 0.70 903 3.78 2.65 0.70 946 3.64 2.55 0.70 989

4.29 2.49 0.58 903 4.11 2.39 0.58 957 3.99 2.31 0.58 978 3.85 2.23 0.58 1021

4.46 2.05 0.46 935 4.31 1.98 0.46 994 4.20 1.93 0.46 1021 4.03 1.85 0.46 1064

4.69 1.59 0.34 978 4.52 1.54 0.34 1032 4.41 1.50 0.34 1064 4.27 1.45 0.34 1118

4.11 3.04 0.74 860 3.94 2.91 0.74 903 3.78 2.80 0.74 946 3.64 2.69 0.74 989

4.29 2.66 0.62 903 4.11 2.55 0.62 957 3.99 2.47 0.62 978 3.85 2.39 0.62 1021

4.46 2.23 0.50 935 4.31 2.15 0.50 994 4.20 2.10 0.50 1021 4.03 2.01 0.50 1064

4.69 1.78 0.38 978 4.52 1.72 0.38 1032 4.41 1.68 0.38 1064 4.27 1.62 0.38 1118

4.11 3.21 0.78 860 3.94 3.07 0.78 903 3.78 2.95 0.78 946 3.64 2.84 0.78 989

4.29 2.83 0.66 903 4.11 2.71 0.66 957 3.99 2.63 0.66 978 3.85 2.54 0.66 1021

4.46 2.41 0.54 935 4.31 2.32 0.54 994 4.20 2.27 0.54 1021 4.03 2.17 0.54 1064

4.69 1.97 0.42 978 4.52 1.90 0.42 1032 4.41 1.85 0.42 1064 4.27 1.79 0.42 1118

4.83 1.45 0.30 1032 4.69 1.41 0.30 1086 4.62 1.39 0.30 1118 4.48 1.34 0.30 1150

4.11 3.37 0.82 860 3.94 3.23 0.82 903 3.78 3.10 0.82 946 3.64 2.98 0.82 989

4.29 3.00 0.70 903 4.11 2.88 0.70 957 3.99 2.79 0.70 978 3.85 2.70 0.70 1021

4.46 2.59 0.58 935 4.31 2.50 0.58 994 4.20 2.44 0.58 1021 4.03 2.33 0.58 1064

4.69 2.16 0.46 978 4.52 2.08 0.46 1032 4.41 2.03 0.46 1064 4.27 1.96 0.46 1118

4.83 1.64 0.34 1032 4.69 1.59 0.34 1086 4.62 1.57 0.34 1118 4.48 1.52 0.34 1150

4.11 3.54 0.86 860 3.94 3.39 0.86 903 3.78 3.25 0.86 946 3.64 3.13 0.86 989

4.29 3.17 0.74 903 4.11 3.04 0.74 957 3.99 2.95 0.74 978 3.85 2.85 0.74 1021

4.46 2.77 0.62 935 4.31 2.67 0.62 994 4.20 2.60 0.62 1021 4.03 2.50 0.62 1064

4.69 2.35 0.50 978 4.52 2.26 0.50 1032 4.41 2.21 0.50 1064 4.27 2.14 0.50 1118

4.83 1.84 0.38 1032 4.69 1.78 0.38 1086 4.62 1.76 0.38 1118 4.48 1.70 0.38 1150

4.11 3.70 0.90 860 3.94 3.54 0.90 903 3.78 3.40 0.90 946 3.64 3.28 0.90 989

4.29 3.34 0.78 903 4.11 3.21 0.78 957 3.99 3.11 0.78 978 3.85 3.00 0.78 1021

4.46 2.95 0.66 935 4.31 2.84 0.66 994 4.20 2.77 0.66 1021 4.03 2.66 0.66 1064

4.69 2.53 0.54 978 4.52 2.44 0.54 1032 4.41 2.38 0.54 1064 4.27 2.31 0.54 1118

4.83 2.03 0.42 1032 4.69 1.97 0.42 1086 4.62 1.94 0.42 1118 4.48 1.88 0.42 1150

4.11 3.87 0.94 860 3.94 3.70 0.94 903 3.78 3.55 0.94 946 3.64 3.42 0.94 989

4.29 3.52 0.82 903 4.11 3.37 0.82 957 3.99 3.27 0.82 978 3.85 3.16 0.82 1021

4.46 3.12 0.70 935 4.31 3.01 0.70 994 4.20 2.94 0.70 1021 4.03 2.82 0.70 1064

4.69 2.72 0.58 978 4.52 2.62 0.58 1032 4.41 2.56 0.58 1064 4.27 2.48 0.58 1118

4.83 2.22 0.46 1032 4.69 2.16 0.46 1086 4.62 2.13 0.46 1118 4.48 2.06 0.46 1150

4.11 4.03 0.98 860 3.94 3.86 0.98 903 3.78 3.70 0.98 946 3.64 3.57 0.98 989

4.29 3.69 0.86 903 4.11 3.54 0.86 957 3.99 3.43 0.86 978 3.85 3.31 0.86 1021

4.46 3.30 0.74 935 4.31 3.19 0.74 994 4.20 3.11 0.74 1021 4.03 2.98 0.74 1064

4.69 2.91 0.62 978 4.52 2.80 0.62 1032 4.41 2.73 0.62 1064 4.27 2.65 0.62 1118

4.83 2.42 0.50 1032 4.69 2.35 0.50 1086 4.62 2.31 0.50 1118 4.48 2.24 0.50 1150

4.11 4.19 1.02 860 3.94 4.02 1.02 903 3.78 3.86 1.02 946 3.64 3.71 1.02 989

4.29 3.86 0.90 903 4.11 3.70 0.90 957 3.99 3.59 0.90 978 3.85 3.47 0.90 1021

4.46 3.48 0.78 935 4.31 3.36 0.78 994 4.20 3.28 0.78 1021 4.03 3.14 0.78 1064

4.69 3.10 0.66 978 4.52 2.98 0.66 1032 4.41 2.91 0.66 1064 4.27 2.82 0.66 1118

4.83 2.61 0.54 1032 4.69 2.53 0.54 1086 4.62 2.49 0.54 1118 4.48 2.42 0.54 1150

INPUT:1075(W)SHF:0.76

OUTDOOR DB(:)

25 27 30

Page 20

35 40 46

CAPACITY:3.5(kW)

INPUT:1075(W)SHF:0.76

OUTDOOR DB(:)

INDOOR INDOOR

DB (:) WB (:)

Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT

3.43 1.99 0.58 1054 3.15 1.83 0.58 1118 2.91 1.68 0.58 1161

3.61 1.66 0.46 1097 3.36 1.55 0.46 1150 3.12 1.43 0.46 1215

3.43 2.13 0.62 1054 3.15 1.95 0.62 1118 2.91 1.80 0.62 1161

3.61 1.80 0.50 1097 3.36 1.68 0.50 1150 3.12 1.56 0.50 1215

3.82 1.45 0.38 1140 3.57 1.36 0.38 1204 3.33 1.26 0.38 1247

3.43 2.26 0.66 1054 3.15 2.08 0.66 1118 2.91 1.92 0.66 1161

3.61 1.95 0.54 1097 3.36 1.81 0.54 1150 3.12 1.68 0.54 1215

3.82 1.60 0.42 1140 3.57 1.50 0.42 1204 3.33 1.40 0.42 1247

3.43 2.40 0.70 1054 3.15 2.21 0.70 1118 2.91 2.03 0.70 1161

3.61 2.09 0.58 1097 3.36 1.95 0.58 1150 3.12 1.81 0.58 1215

3.82 1.75 0.46 1140 3.57 1.64 0.46 1204 3.33 1.53 0.46 1247

4.03 1.37 0.34 1183 3.78 1.29 0.34 1236 3.57 1.21 0.34 1290

3.43 2.54 0.74 1054 3.15 2.33 0.74 1118 2.91 2.15 0.74 1161

3.61 2.24 0.62 1097 3.36 2.08 0.62 1150 3.12 1.93 0.62 1215

3.82 1.91 0.50 1140 3.57 1.79 0.50 1204 3.33 1.66 0.50 1247

4.03 1.53 0.38 1183 3.78 1.44 0.38 1236 3.57 1.36 0.38 1290

3.43 2.68 0.78 1054 3.15 2.46 0.78 1118 2.91 2.27 0.78 1161

3.61 2.38 0.66 1097 3.36 2.22 0.66 1150 3.12 2.06 0.66 1215

3.82 2.06 0.54 1140 3.57 1.93 0.54 1204 3.33 1.80 0.54 1247

4.03 1.69 0.42 1183 3.78 1.59 0.42 1236 3.57 1.50 0.42 1290

4.24 1.27 0.30 1226 3.99 1.20 0.30 1279 3.75 1.12 0.30 1333

3.43 2.81 0.82 1054 3.15 2.58 0.82 1118 2.91 2.38 0.82 1161

3.61 2.52 0.70 1097 3.36 2.35 0.70 1150 3.12 2.18 0.70 1215

3.82 2.21 0.58 1140 3.57 2.07 0.58 1204 3.33 1.93 0.58 1247

4.03 1.85 0.46 1183 3.78 1.74 0.46 1236 3.57 1.64 0.46 1290

4.24 1.44 0.34 1226 3.99 1.36 0.34 1279 3.75 1.27 0.34 1333

3.43 2.95 0.86 1054 3.15 2.71 0.86 1118 2.91 2.50 0.86 1161

3.61 2.67 0.74 1097 3.36 2.49 0.74 1150 3.12 2.31 0.74 1215

3.82 2.37 0.62 1140 3.57 2.21 0.62 1204 3.33 2.06 0.62 1247

4.03 2.01 0.50 1183 3.78 1.89 0.50 1236 3.57 1.79 0.50 1290

4.24 1.61 0.38 1226 3.99 1.52 0.38 1279 3.75 1.42 0.38 1333

3.43 3.09 0.90 1054 3.15 2.84 0.90 1118 2.91 2.61 0.90 1161

3.61 2.81 0.78 1097 3.36 2.62 0.78 1150 3.12 2.43 0.78 1215

3.82 2.52 0.66 1140 3.57 2.36 0.66 1204 3.33 2.19 0.66 1247

4.03 2.17 0.54 1183 3.78 2.04 0.54 1236 3.57 1.93 0.54 1290

4.24 1.78 0.42 1226 3.99 1.68 0.42 1279 3.75 1.57 0.42 1333

3.43 3.22 0.94 1054 3.15 2.96 0.94 1118 2.91 2.73 0.94 1161

3.61 2.96 0.82 1097 3.36 2.76 0.82 1150 3.12 2.55 0.82 1215

3.82 2.67 0.70 1140 3.57 2.50 0.70 1204 3.33 2.33 0.70 1247

4.03 2.33 0.58 1183 3.78 2.19 0.58 1236 3.57 2.07 0.58 1290

4.24 1.95 0.46 1226 3.99 1.84 0.46 1279 3.75 1.72 0.46 1333

3.43 3.36 0.98 1054 3.15 3.09 0.98 1118 2.91 2.85 0.98 1161

3.61 3.10 0.86 1097 3.36 2.89 0.86 1150 3.12 2.68 0.86 1215

3.82 2.82 0.74 1140 3.57 2.64 0.74 1204 3.33 2.46 0.74 1247

4.03 2.50 0.62 1183 3.78 2.34 0.62 1236 3.57 2.21 0.62 1290

4.24 2.12 0.50 1226 3.99 2.00 0.50 1279 3.75 1.87 0.50 1333

3.43 3.50 1.02 1054 3.15 3.21 1.02 1118 2.91 2.96 1.02 1161

3.61 3.24 0.90 1097 3.36 3.02 0.90 1150 3.12 2.80 0.90 1215

3.82 2.98 0.78 1140 3.57 2.78 0.78 1204 3.33 2.59 0.78 1247

4.03 2.66 0.66 1183 3.78 2.49 0.66 1236 3.57 2.36 0.66 1290

4.24 2.29 0.54 1226 3.99 2.15 0.54 1279 3.75 2.02 0.54 1333

PERFORMANCE DATA COOL operation at Rated frequency

MUZ-GC35VA MUZ-GC35VAH

NOTE: Q : Total capacity (kW) SHF : Sensible heat factor DB : Dry-bulb temperature

SHC : Sensible heat capacity (kW) INPUT : Total power input (W) WB : Wet-bulb temperature

Page 21

PERFORMANCE DATA HEAT operation at Rated frequency

CAPACITY:3.2(kW)

INPUT:835(W)

OUTDOOR WB(:)

INDOOR

-10 -5 0 5 10 15 20

DB(:)

Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT 15 21 26

2.02 543 2.43 651 2.85 735 3.26 793 3.68 843 4.06 868 4.48 885

1.92 585 2.30 693 2.72 768 3.10 827 3.52 868 3.90 893 4.30 927

1.73 626 2.14 735 2.53 810 2.94 868 3.36 910 3.74 935 4.16 960

CAPACITY:4.0(kW)

INPUT:1055(W)

OUTDOOR WB(:)

INDOOR

-10 -5 0 5 10 15 20

DB(:)

Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT 15 21 26

2.52 686 3.04 823 3.56 928 4.08 1002 4.60 1066 5.08 1097 5.60 1118

2.40 739 2.88 876 3.40 971 3.88 1044 4.40 1097 4.88 1129 5.38 1171

2.16 791 2.68 928 3.16 1023 3.68 1097 4.20 1150 4.68 1182 5.20 1213

MUZ-GC25VA MUZ-GC25VAH

MUZ-GC35VA MUZ-GC35VAH

NOTE: Q:Total capacity (kW) INPUT:Total power input (W) DB : Dry-bulb temperature WB : Wet-bulb temperature

Page 22

OFF

Outdoor fan motor

Compressor

5 seconds 15 seconds

ON OFF

Compressor

Outdoor fan motor

R.V.coil

ON OFF

<COOL>

5 seconds

<HEAT>

5 seconds

Discharge temperature thermistor Indoor coil temperature thermistor

Defrost thermistor

Fin temperature thermistor Ambient temperature thermistor

Compressor

LEV

Outdoor

fan motor

Indoor

fan motor

Defrost

heater

R.V. coil

Sensor Purpose

Actuator

w1 MUZ-GC35VA

MUZ-GC35VAH

Protection Cooling : Coil frost prevention Heating : High pressure protection Cooling : High pressure protection Heating : Defrosting

Protection Cooling : Low outside temperature operation Heating : Defrosting (Heater)

ACTUATOR CONTROL

MUZ-GC25VA MUZ-GC35VA MUZ-GC25VAH MUZ-GC35VAH

9-1. 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.

9-2. R.V. coil control

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

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

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

ON OFF OFF

9-3. Relation between main sensor and actuator

Page 23

Housing point

SERVICE FUNCTIONS

MUZ-GC25VA MUZ-GC35VA MUZ-GC25VAH MUZ-GC35VAH

10-1. CHANGE IN DEFROST SETTING

<JS> When the JS wire of the outdoor Inverter P.C. board is cut/ soldered, the defrost finish temperature is changed. (Refer to 11-6-1.)

Jumper wire

(Initial setting)

soldered

none (cut)

Defrost finish temperature (:)

MUZ-GC25VA MUZ-GC35VA

MUZ-GC25VAH MUZ-GC35VAH

10-2. PRE-HEAT CONTROL SETTING

PRE-HEAT CONTROL

When moisture gets into the refrigerant cycle, it may interfere the start-up of the compressor at low outside temperature. The pre-heat control prevents this interference. The pre-heat control turns ON when outside temperature is 20°C or below. When pre-heat control is turned ON, compressor is energized. (about 50 W)

MUZ-GC25 <JK> When the JK wire of the inverter P.C. board is cut, pre-heat control is activated.(Refer to 11-6.1) MUZ-GC35 Inverter P.C.board needs to changed.

NOTE: When the inverter P.C. board is replaced, check the Jumper wires, and cut/solder them if necessary.

TROUBLESHOOTING

MUZ-GC25VA MUZ-GC35VA MUZ-GC25VAH MUZ-GC35VAH

11-1. Cautions on troubleshooting

1. Before troubleshooting, check the following:

1) Check the power supply voltage.

2) Check the indoor/outdoor connecting wire for mis-wiring.

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, and 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

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) If the electronic control P.C. board is supposed to be defective, check the copper foil pattern for disconnection and

the components for bursting and discoloration.

4) Refer to 11-2. and 11-3.

Page 24

Operational procedure

Yes

(Blinks)

(OFF)

Yes

Releasing the failure mode recall function

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.

W2. Blinking pattern when the indoor unit is abnormal:

W3.Blinking pattern when the outdoor unit is abnormal:

OFF

Beeps

Repeated cycle Repeated cycle

OFF

No beep Beeps

Repeated cycle

2.5-second OFF

Blinking at 0.5second interval

2.5-second OFF 3-second ON

Blinking at 0.5second interval

Beeps

Repeated cycle

2.5-second OFF

Blinking at 0.5second interval

No beep Beeps

Repeated cycle

2.5-second OFF 3-second ON

Blinking at 0.5second interval

Repeated cycle

Beeps

Does upper 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 are emitted at the same timing as the blinking of upper lamp of OPERATION INDICATOR lamp. W2

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

Setting up the failure mode recall function

Before blinking, does upper 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 confirm 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. W2

Turn ON the power supply. <

Preparation of the remote controller

> 1 While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button. 2 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.

Deleting the memorized abnormal condition

1After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall function" mentioned above. 2Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit.

3Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted. 4Release the failure mode recall function according to "Releasing the failure mode recall function"

mentioned above.

Repair the defective parts.

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.

Judgment of indoor/outdoor abnormality

Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. W1

Indoor unit is normal. But the outdoor unit might be abnormal because there are some abnormalities that can't be recalled with this way. Confirm if outdoor unit is abnormal according to the detailed outdoor unit failure mode recall function.(Refer to 11-2.2)

The outdoor unit is abnormal. Check the blinking pattern, and confirm the abnormal point with the outdoor unit failure mode table (Refer to 11-2.3). Make sure to check at least two consecutive blinking cycles. W3

W1. Regardless of normal or abnormal condition, a short beep is emitted once the signal is received.

11-2. 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 (11-4.) 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

Page 25

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

Operational procedure

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. W2.Blinking pattern when outdoor unit is abnormal:

Yes

(Blinks)

(OFF)

OFF

No beep

Beeps

Repeated cycle

2.5-second OFF 3-second ON

Blinking at 0.5second interval

No beep Beeps

Repeated cycle

2.5-second OFF 3-second ON

Blinking at 0.5-

second interval

Repeated cycle

W1. Regardless of normal or abnormal condition, 2 short beeps are emitted as the signal is received.

Does upper lamp of OPERATION INDICATOR lamp on the indoor unit blink at the interval of 0.5 seconds? Blinks: The outdoor unit is abnormal. Beep are emitted at the same timing as the blinking of upper lamp of OPERATION INDICATOR lamp. W2

Deleting the memorized abnormal condition

3Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted. 4Release the failure mode recall function according to "Releasing the failure mode recall function"

mentioned above.

Repair the defective parts.

With the remote controller headed towards the indoor unit, press TOO COOL or TOO WARM button to adjust the set temperature to 25:. W1

The outdoor unit is normal.

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.

The outdoor unit is abnormal. Check the blinking pattern, and confirm the abnormal point with the outdoor unit failure mode table (Refer to 11-2.3.). Make sure to check at least two consecutive blinking cycles. W2

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

Confirm that the remote controller is in the failure mode recall function.

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

Page 26

3. Outdoor unit failure mode table

2-time flash

2.5 seconds OFF

3-time flash

2.5 seconds OFF

4-time flash

2.5 seconds OFF

5-time flash

2.5 seconds OFF

6-time flash

2.5 seconds OFF

7-time flash

2.5 seconds OFF

8-time flash

2.5 seconds OFF

9-time flash

2.5 seconds OFF 10-time flash

2.5 seconds OFF

11-time flash

2.5 seconds OFF

12-time flash

2.5 seconds OFF

14-time flash

2.5 seconds OFF

None (Normal) Outdoor power system

Discharge temperature thermistor Defrost thermistor Fin temperature thermistor

P.C. board temperature thermistor Ambient temperature thermistor Overcurrent

Compressor synchronous abnormality (Compressor start-up failure protection)

Discharge temperature

High pressure

Fin temperature/ P.C. board temperature

Outdoor fan motor

Nonvolatile memory data

Discharge temperature

DC voltage Each phase current of compressor Overcurrent

Compressor open-phase

Stop valve (Closed valve)

Abnormal point

(Failure mode / protection)

Over current protection stop is continuously performed three times within 1 minute after the compressor gets started.

Thermistor shorts or opens during compressor running.

14 A (MUZ-GC25)/24 A (MUZ-GC35) current flow into intelligent power module.

Waveform of compressor current is distorted.

Temperature of discharge temperature thermistor exceeds 116:, compressor stops. Compressor can restart if discharge temperature thermistor reads 100: or less 3 minutes later. Temperature indoor coil thermistor exceeds 70: in HEAT mode. Temperature defrost thermistor exceeds 70: in COOL mode. Temperature of fin temperature thermistor on the inverter P.C. board exceeds 82 : (MUZ-GC25)/83: (MUZ

-GC35), or temperature of P.C. board temperature thermistor on the inverter P.C. board exceeds 81: (MUZ-GC25) /85: (MUZ-GC35).

Outdoor fan has stopped 3 times in a row within 30 seconds after outdoor fan start-up.

Nonvolatile memory data cannot be read properly. Temperature of discharge temperature thermistor has been 50: or less for 20 minutes.

DC voltage of inverter cannot be detected normally. Each phase current of compressor cannot be detected normally. 14 A (MUZ-GC25) / 24 A (MUZ-GC35) current flow into intelligent power module (IPM). The open-phase operation of compressor is detected. The interphase short out occurs in the output of the intelligent power module (IPM). The compressor winding shorts out.

Closed valve is detected by compressor current.

Condition

•Reconnect connectors.

•Refer to 11-5. A"How to

check inverter/ compressor".

•Check stop valve.

•Refer to 11-5.G"Check

of outdoor thermistors". ❈Defective outdoor thermistors can be identified by checking the blinking pattern of LED.

•Reconnect compressor connector.

•Refer to 11-5.A"How to check inverter/ compressor".

•Check stop valve.

•Reconnect compressor

connector.

•Refer to 11-5.A"How to check inverter/ compressor".

•Check refrigerant circuit and refrigerant amount.

•Refer to 11-5.L"Check of LEV".

•Check refrigerant circuit and refrigerant amount.

•Check stop valve.

•Check around outdoor unit.

•Check outdoor unit air

passage.

•Refer to 11-5.I"Check of outdoor fan motor".

Refer to 11-5.M"Check of inverter P.C. board".

•Replace the inverter P.C. board.

•Refer to 11-5.L"Check of LEV".

•Check refrigerant circuit and refrigerant amount.

•Refer to 11-5.A"How to check inverter/ compressor".

•Reconnect compressor connector.

•Refer to 11-5. A"How to check inverter/ compressor".

•Check stop valve

Correspondence

Indoor/outdoor

unit failure mode

recall function

Outdoor unit failure mode

recall function

1-time flash every

2.5 seconds 3-time flash

2.5 seconds OFF 4-time flash

2.5 seconds OFF 2-time flash

2.5 seconds OFF 11-time flash

2.5 seconds OFF

12-time flash

2.5 seconds OFF

7-time flash

2.5 seconds OFF

5-time flash

2.5 seconds OFF

8-time flash

2.5 seconds OFF 9-time flash

2.5 seconds OFF 10-time flash

2.5 seconds OFF

LED indication

(Outdoor P.C. board)

OFF

The upper lamp of

OPERATION INDICATOR

lamp(Indoor unit)

14-time flash

2.5 seconds OFF

NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-3.).

Page 27

Abnormal point/ Condition

Over current protection stop is continuously performed three times within 1 minute after the compressor gets started, or failure of restart of compressor has repeated 24 times.

Discharge temperature thermistor, fin temperature thermistor, defrost thermistor, P.C. board temperature thermistor or ambient temperature thermistor shorts or opens during compressor running.

Nonvolatile memory data cannot be read properly. (When the upper lamp of OPERATION INDICATOR lamp of the

indoor unit lights up or flashes 7-time.)

14 A (MUZ-GC25)/ 24 A (MUZ-GC35) current flows into intelligent power module, or compressor repeats after 15 seconds when overcurrent protection occures with in 10 seconds after compressor starts. (Repeated 24 times at Maximum)

Temperature of discharge temperature thermistor exceeds 116:, compressor stops. Compressor can restart if discharge temperature thermistor reads 100: or less 3 minutes later.

Temperature of fin temperature thermistor on the heat sink exceeds 82: (MUZ-GC25)/ 83: (MUZ-GC35) or temperature of P.C. board temperature thermistor on the inverter P.C.board exceeds 81: (MUZ-GC25)/ 85: (MUZ-GC35).

Indoor coil thermistor exceeds 70: in HEAT mode. Defrost thermistor exceeds 70: in COOL mode.

Current from power outlet exceeds 5.5 A (MUZ-GC25)/ 5.2 A (MUZ-GC35 in COOL mode)/6.1 A (MUZ-GC35 in HEAT mode), compressor frequency lowers.

Temperature of indoor coil thermistor exceeds 55: in HEAT mode, compressor frequency lowers.

Indoor coil thermistor reads 8: or less in COOL mode, compressor frequency lowers.

Temperature of discharge temperature thermistor exceeds 111:, compressor frequency lowers.

Temperature of discharge temperature thermistor has been 50: or less for 20 minutes.

No.

Symptom

LED indication

Condition

Correspondence

Outdoor unit does not operate.

'Outdoor unit stops and restarts 3 minutes later' is repeated.

Outdoor unit operates.

1-time flash every

2.5 seconds

2-time flash

2.5 seconds OFF

3-time flash

2.5 seconds OFF

4-time flash

2.5 seconds OFF

5-time flash

2.5 seconds OFF

1-time flash

2.5 seconds OFF

3-time flash

2.5 seconds OFF

4-time flash

2.5 seconds OFF

7-time flash

2.5 seconds OFF

Outdoor power system

Outdoor thermistors

Outdoor control system

Overcurrent protection

Discharge temperature overheat protection

Fin temperature /P.C. board temperature thermistor overheat protection

High pressure protection

Frequency drop by current protection

Frequency drop by high pressure protection

Frequency drop by defrosting in COOL mode

Frequency drop by discharge temperature protection

Low discharge temperature protection

Reconnect connector of compressor.

· Refer to 11-5.A "How to check inverter/ compressor".

· Check stop valve.

· Refer to 11-5.G "Check of outdoor

thermistors".

Reconnect connector of compressor.

· Refer to 11-5.A "How to check

inverter/compressor".

· Check stop valve.

Replace inverter P.C. board.

· Check refrigerant circuit and refrigerant amount.

· Refer to 11-5.L "Check of LEV".

· Check around outdoor unit.

· Check outdoor unit air passage.

· Refer to 11-5.I "Check of outdoor

fan motor".

· Check refrigerant circuit and refrigerant amount.

· Check stop valve.

The unit is normal, but check the following.

· Check if indoor filters are clogged.

· Check if refrigerant is short.

· Check if indoor/outdoor unit air

circulation is short cycled.

· Refer to 11-5.L "Check of LEV".

· Check refrigerant circuit and

refrigerant amount.

Inverter P.C. board (Parts side)

LED

Flashing

Refer to 11-5.N "How to check miswiring and serial signal error.

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

Serial signal

8-time flash

2.5 seconds OFF

Compressor synchronous abnormality

The waveform of compressor current is distorted.

Reconnect connector of compressor.

· Refer to 11-5.A "How to check inverter/compressor".

8-time flash

2.5 seconds OFF

PAM protection PAM:

Pulse Amplitude Modulation

The overcurrent flows into IGBT(Insulated Gate Bipolar transistor : TR821) or when the bus-bar voltage reaches 320 V or more, PAM stops and restarts.

This is not malfunction. PAM protection will be activated in the following cases; 1Instantaneous power voltage drop (Short time power failure) 2When the power supply voltage is high.

9-time flash

2.5 seconds OFF

Inverter check mode

The connector of compressor is disconnected, inverter check mode starts.

Check if the connector of the compressor is correctly connected. Refer to 11-5.A "How to check inverter/ compressor".

10-time flash

2.5 seconds OFF

Outdoor fan motor

6-time flash

2.5 seconds OFF

· Check stop valve.

Closed valve is detected by compressor current.

Stop valve/ Closed valve

11-time flash

2.5 seconds OFF

Outdoor fan has stopped 3 times in a row within 30 seconds after outdoor fan start-up.

· Refer to 11-5.I "Check of outdoor

fan motor.

· Refer to 11-5.M "Check of inverter

P.C. board.

12-time flash

2.5 seconds OFF

Each phase current of compressor

Each phase current of compressor cannot be detected normally

· Refer to 11-5.A "How to check inverter/compressor".

13-time flash

2.5 seconds OFF

DC voltage

DC voltage of inverter cannot be detected normally.

· Refer to 11-5.A "How to check inverter/compressor".

· Check refrigerant circuit and refrigerant amount.

· Refer to 11-5.L "Check of LEV".

· Refer to 11-5.G "Check of

outdoor thermistors".

Refer to 11-2.2. "Flow chart of the detailed outdoor unit failure mode recall function".

Outdoor unit is defective.

Outdoor unit (Other abnormality)

14-time flash

2.5 seconds OFF

11-3. Troubleshooting check table

NOTE: 1. The location of LED is illustrated at the right figure. Refer to 11-6.1.

2. LED is lighted during normal operation.

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

2.5-second OFF

OFF

0.5-second ON

2.5-second OFF

0.5-second ON

Page 28

11-4. Trouble criterion of main parts

Part name FigureCheck method and criterion

Outdoor fan motor (MF) INNER FUSE (Only MUZ-GC25) RA6V21-AB 152 : CUT OFF RA6V21-BB 126i2 : CUT OFF

-5

R.V. coil (21S4)

Expansion valve coil (LEV)

Measure the resistance between the terminals with a tester. (Part temperature –20˚C ~ 40˚C)

WHT – BLK BLK – RED

RED – WHT

Normal

Measure the resistance between the terminals with a tester. (Part temperature –20˚C ~ 40˚C)

Normal

1.26 k" ~ 1.62 k" 1.21 k" ~ 1.56 k"

WHT – RED RED – ORN YLW – BRN

BRN – BLU

Normal

38 " ~ 50 "

Measure the resistance with a tester. (Part temperature –20˚C ~ 40˚C)

Measure the resistance with a tester.

Refer to 11-7. "Test point diagram and voltage", 1. "Inverter P.C. board", the chart of thermistor.

Color of the lead wire

Discharge temperature thermistor (RT62)

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

Defrost thermistor (RT61)

Fin temperature thermistor (RT64)

Ambient temperature thermistor (RT65)

31 " ~ 41 " 31 " ~ 41 " 31 " ~ 41 "

Measure the resistance between the terminals with a tester. (Part temperature –20˚C ~ 40˚C)

Compressor (MC)

MUZ-GC25

U-V

U-W

V-W

Normal

1.43 " ~ 1.84 "

1.58 " ~ 2.03"

MUZ-GC35

MUZ-GC25

MUZ-GC35MUZ-GC25

Measure the resistance with a tester. (Part temperature –20˚C ~ 40˚C)

MUZ-GC35

MUZ-GC25

WHT

RED BLK

WHT

RED BLK

WHT

RED

BLK

FUSE

MUZ-GC35

Defrost heater (H)

Normal

313 " ~ 402 " 333 " ~ 428 "

MUZ-GC35MUZ-GC25

RA6V21-BB

RA6V21-AB

292 " ~ 374 " 236 " ~ 304 "

212 " ~ 272 " 234 " ~ 300 "

LEV

WHT6

RED1

ORN4

YLW5

BRN2

BLU3

MUZ-GC25VA MUZ-GC35VA MUZ-GC25VAH MUZ-GC35VAH

Page 29

11-5. Troubleshooting flow

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

How to check inverter/ compressor

Disconnect the connector (CN61) between compressor and the intelligent power module (IPM).

Check the voltage between terminals.

Are the voltages

balanced?

Yes

Check the compressor.

Check of open phase

●With the connector between the compressor and the intelligent power module disconnected, activate the inverter and check if the inverter is normal by measuring the balance of voltage between the terminals.

Output voltage 115V

<< Operation method>> Start cooling or heating operation by pressing EMERGENCY OPERATION switch on

the indoor unit. (Test run operation : refer to 8-3.)

<<Measurement point>>

at 3 points BLK (U)-WHT (V) BLK (U)-RED (W) WHT(V)-RED (W)

NOTE: 1. Output voltage varies according to power supply voltage.

2. Measure the voltage by analog type tester.

3. During this check, LED of inverter P.C. board flashes 9 times. (Refer to 11-6.1.)

See 11-5.B “Check of open phase” .

Replace the inverter P.C. board.

See 11-5.C “Check of compressor” .

w Measure AC voltage between the lead wires at 3 points.

9-time flash

2.5-second OFF

Check of compressor

Refer to 11-5.D "Check of compressor winding". Is the compressor normal?

Refer to 11-5.E "Check of compressor operation time".

Does the compressor operate continuously?

Yes

(MUZ-GC25)

(MUZ-GC35)

Replace the compressor.

Refer to 11-5.F "Check of compressor start failure".

Is the compressor operation time more than 10 seconds?

Yes

Check the refrigerant circuit. Check stop valve.

Replace the compressor.

Page 30

Check of compressor winding

● Disconnect the connector (CN61) between the compressor and intelligent power module, and measure the resistance between the compressor terminals.

<<Measurement point>>

at 3 points BLK-WHT BLK-RED WHT-RED

<<Judgement>>

Refer to 11-4. 0["] ···············Abnormal [short] Infinite["] ·······Abnormal [open] NOTE: 1. Be sure to zero the ohmmeter before measurement.

2. Winding resistance for each phase at 20:. Refer to 3.SPECIFICATION.

Check of compressor operation time

●Connect the compressor and activate the inverter. Then measure the time until the inverter stops due to over current.

<<Operation method>> Start heating or cooling operation by pressing EMERGENCY OPERATION switch on the indoor unit.

(Test run operation : Refer to 8-3.)

<<Measurement>> Measure the time from the start of compressor to the stop of compressor

due to over current.

w Measure the resistance between the lead wires at 3 points.

<<Judgement>> For refrence

0 second 1 second

2 seconds

Compressor starts

Abnormal (IPM failure) (Compressor winding short)

Abnormal (Compressor lock out) (Starting defect)

Check of compressor start failure

Confirm that 1~5 is normal.

•Electrical circuit check

1Contact of the compressor connector (including CN61) 2Output voltage of inverter P.C.board and balance of them (See 11-5.B) 3Direct current voltage between DB61(+) and (-) on inverter P.C.board 4Voltage 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.

10 seconds

10 minutes

Abnormal (Poor contact,) (Outdoor P.C.board defect) (disconnected connector)

Abnormal (Refrigerant circuit defect) (closed valve)

Normal

After the compressor is heated with a drier, does the compressor start? w1

Yes

Compressor start failure. Activate pre-heat control. (Refer to 10-2. "PRE-HEAT CONTROL SETTING")

Replace the compressor

w1 Heat with a drier for about 20 minutes. Do not recover refrigerant gas while heating compressor with a drier.

Heating part

Page 31

When OPERATION INDICATOR lamp flashes 6-time.

Measure the resistance between CN641 1 and 2.

Measure the resistance between CN642 1 and 2.

Yes

Replace the thermistor except RT64. In case that RT64 is abnormal, replace the inverter P.C. board, since RT64 is combined with the inverter P.C. board.

Replace the inverter

P.C. board.

Disconnect the connectors CN641, CN642 and CN643 from the inverter P.C. board.

(Check the characteristics of each thermistor.)

Defrost thermistor RT61

Measure the resistance between CN641 3 and 4.

Reconnect the connectors CN641, CN642 and CN643. Turn ON the power supply and press EMERGENCY OPERATION switch.

Discharge temperature thermistor RT62

Fin temperature thermistor RT64

Is the resistance of thermistor normal? (Refer to 11-6.1.)

Yes

Does the unit operate 10 minutes or more?

OK. (Cause is poor contact.)

Measure the resistance between CN643 1 and 2.

Ambient temperature thermistor RT65

Disconnect connector (CN61) between the compressor and intelligent power module. Turn ON the power supply and press EMERGENCY OPERATION switch twice (HEAT mode).

Is there 230V AC between CN7211 and 2 on the inverter P.C.board(GC25) or power P.C. board(GC35) 3 minutes after the power supply is turned ON?

Yes

Replace the inverter P.C.board(GC25) or power P.C.board(GC35).

Replace the 4-way valve.

Disconnect connector (CN61) between the compressor and the intelligent power module. Turn ON the power supply and press EMERGENCY OPERATION switch once (COOL mode).

Is there 230V AC between CN7211 and 2 on the inverter P.C.board(GC25) or power P.C.board(GC35) 3 minutes after the power supply is turned ON?

Yes

w First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 11-4. w In case CN721 is not connected or R.V. coil is open, voltage is generated between the

terminal pins of the connector although any signal is not being transmitted to R.V. coil. Check if CN721 is connected.

CN721

Inverter P.C.board (Soldered side)

MUZ-GC25

CN721

Power P.C.board (Soldered side)

MUZ-GC35

Replace the inverter P.C.board(GC25) or power P.C.board(GC35).

The thermistors in the outdoor unit are abnormal.

Check of outdoor thermistors

Check of R.V. coil

Unit operates COOL mode even if it is set to HEAT mode.

Unit operates HEAT mode even if it is set to COOL mode.

Page 32

Outdoor fan motor does not operate.

Replace the outdoor fan motor.

Does upper lamp of OPERATION INDICATOR lamp on the indoor unit light up?

Is the resistance of fan motor normal?

3 minutes after, is there voltage 230V AC between CN771 2 and 3 on the inverter P.C. board?

Disconnect the connector CN771 on inverter P.C. board. Disconnect the connector (CN61) between compressor and power transistor module. Turn ON the power supply and press the EMERGENCY OPERATION switch.

Yes

Check the resistance of fan motor. (Refer to 11-4.)

Replace the inverter P.C. board.

Replace the outdoor fan motor.

Does the voltage between each terminal repeat 5V and 0V DC by turns?

Does the outdoor fan rotate smoothly?

Check the inverter P.C. board. (Refer to 11-5. M)

Yes

( Fixed to either 5V or 0V DC)

Yes

Rotate the outdoor fan slowly by hand, and measure the voltage of CN931 (Measurement of feedback output). Between 1(+) and 5(-) Between 2(+) and 5(-) Between 3(+) and 5(-)

Is the resistance between each terminal of outdoor fan motor normal? (Refer to 11-4.)

Disconnect CN932 from the inverter P.C. board.

Replace the outdoor fan motor.

CN931

CN932

Inverter P.C. board (Solder side)

Turn ON the power supply.

Check of outdoor fan motor

MUZ-GC25VA MUZ-GC25VAH

MUZ-GC35VA MUZ-GC35VAH

Page 33

● Check other electric parts in the main circuit together in the case that the current-limiting resistor is defective.

Turn ON the power supply and press EMERGENCY OPERATION switch.

Replace the inverter P.C. board or the compressor.

Replace the power P.C. board or the inverter P.C. board.

Does the rush current limiting relay(X64) work properly? (Normally it closes 1 second after outdoor unit power ON.)

Yes

Is the resistance of current-limiting resistor (R64A or R64B) on the power P.C. board normal? (Normal resistance : 5' i5%)

Replace the power P.C.board.

Replace the power P.C. board.

Does LED on the inverter P.C. board light up?

Inverter does not operate.

Disconnect the connector (CN61) between compressor and intelligent power module. Turn ON power supply and press EMERGENCY OPERATION switch.

Check the electric parts in main circuit.

If light up,ok. If flash, refer to 11-3.

Is there voltage 280V ~ 370V DC between DB61 (+) and DB61 (–) on the inverter P.C. board? (Refer to 11-6.1.)

Dose LED on the inverter P.C. board light up or flash? (Refer to 11-6.1.)

Yes

Replace the indoor

electronic control P.C. board.

Yes

Replace the inverter P.C. board.

DB61

280V~370V DC

Inverter P.C. board (Solder side)

Is there voltage 230V AC

between the indoor terminal block S1 and S2?

Rectify indoor/ outdoor connecting wire.

Does the upper lamp of OPERATION INDICATOR lamp on the indoor unit light up?

Check of power supply

Outdoor unit does not operate at all, or stops immediately due to overcurrent.

Check of current-limiting resistor

MUZ-GC35VA MUZ-GC35VAH

When the current-limiting resistor is open, the rush current limiting relay (X64) may not work properly.

Page 34

Heating/Cooling does not work sufficiently.

Replace the LEV.

Expansion valve operates in full-opening direction.

Is LEV properly fixed to the expansion valve?

Do you hear the expansion valve "click, click·······"? Do you feel the expansion valve vibrate on touching it ?

Does the resistance of LEV have the characteristics? (Refer to 11-4.)

Measure each voltage between connector pins of CN724 on the inverter P.C. board.

1.Pin3(-) Pin1(+)

2.Pin4(-) Pin1(+)

3.Pin5(-) Pin1(+)

4.Pin6(-) Pin1(+) Is there about 3~5V AC between each? NOTE: Measure the voltage by an analog tester.

Yes

Replace the expansion valve.

Yes

Properly fix the LEV to the expansion valve.

Replace the inverter P.C. board.

NOTE : After check of LEV, do the undermentioned operations.

1. Turn OFF the power supply and turn ON it again.

2. Press RESET button on the remote controller.

W1. Regardless of normal or abnormal condition, a short beep is emitted once the signal is received.

Turn ON the power supply. <

Preparation of the remote controller

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

controller at the same time, press RESET button. 2 First, release RESET button. And release the other two buttons after all LCD

except the set temperature in operation display

section of the remote controller is displayed after

3 seconds.

Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. W1

Check of LEV (Expansion valve)

Page 35

Yes (10-time flash)

Yes

Check the LED indication on the inverter P.C. board. Does the LED flash 10-time?

Is the fuse (F901) blown on the inverter P.C. board?

Replace the inverter P.C. board.

CN931

CN932

Inverter P.C.board (Solder side)

Check the corresponding parts following LED indication. (Refer to 11-3.)

Operate the outdoor unit by starting EMERGENCY OPERATION.

Check the connection of the connectors. (CN931, CN932) of outdoor fan motor. If the connection is poor, make it correct.

Check the outdoor fan motor.

(Refer to11-5.I.)

Outdoor fan motor does not operate , or stops immediately after starting up.

Check of inverter P.C. board

MUZ-GC35VA MUZ-GC35VAH

Page 36

• When unit cannot operate neither by the remote controller nor by EMERGENCY OPERATION switch.

Is there rated voltage in the power supply?

Is there any mis-wiring, poor contact, or wire disconnection of the indoor/outdoor connecting wire?

W1. Mis-wiring may damage indoor P.C. board during the

operation. Be sure to confirm the wiring is correct before the operation starts.

W3. 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.

(Lighted or not lighted)

Yes

W2 Be careful to the residual voltage of smoothing capacitor.

Yes

Turn OFF the power supply.

Turn ON the power supply.

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

Does the upper lamp of OPERATION INDICATOR lamp light up? <Confirmation of the power to the indoor unit>

Press EMERGENCY OPERATION switch once.

Check the power supply.

Turn OFF the power supply. Check once more if the indoor/outdoor connecting wire is not mis-wiring.

Short-circuit outdoor terminal block S2 and S3. W1

Turn ON the power supply.

Check the wiring.

Correct them.

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 20V DC between indoor terminal block S2 and S3? <Confirmation of serial signal> Is there rated voltage between indoor terminal block S1 and S2? <Confirmation of power voltage>

Yes

Replace the inverter P.C. board or the outdoor electronic control P.C.board. W2

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?

Replace the indoor/outdoor connecting wire.

Is serial signal error indicated 6 minutes later?

Yes

· Turn OFF inverter-controlled lighting equipment.

· Turn OFF the power supply and then turn ON again.

· Press EMERGENCY OPERATION switch.

· Reinstall either the unit or the light each other away.

· Attach a filter on remote control receiving section of the indoor unit.

Is serial signal error indicated 6 minutes later?

Is there 2V DC or less between CN10A3(+) and JPG(GND)(–) on the indoor electronic control P.C. board?

Is there 2V DC or less between CN10A4(+) and JPG(GND)(–) on the indoor electronic control P.C. board?

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

Is there 2V DC or less between CN10A4(+) and JPG(GND)(–) on the indoor electronic control P.C. board?

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-second-ON quick blinking"? W3

Replace the indoor power / terminal P.C. board.

Replace the indoor electronic control P.C. board.

Indoor unit does not operate.

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

How to check mis-wiring and serial signal error (when outdoor unit does not work)

Page 37

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

Yes

Is the distance between the antennas and the indoor unit within 3m, or is the distance between the antennas and the outdoor unit within 3m?

Is the distance between the TV sets or radios and the indoor unit within 1m, or is the distance between the TV sets or radios and the outdoor unit within 3m?

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?

Even if all of the above conditions are fulfilled, the electromagnetic noise may enter, depending on the electric field strength or the installation condition (combination of specific 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 field intensity of the broadcast station affected by the electromagnetic noise

6.Presence or absence of amplifier 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.

After checking the above, consult the service representative.

Is the unit earthed?

Earth 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.

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

Electromagnetic noise enters into TV sets or radios

Page 38

Replace the inverter P.C. board.

Is there 230V AC between CN722 1 and 3 on the inverter P.C. board(GC25) or power P.C. board(GC35)? Refer to 11-6.

Yes

No problem of the inverter P.C. board(GC25) or power P.C. board(GC35).

Is the voltage between CN726 2(+)-3(-) on the power P.C. board 0V DC? Refer to 11-6.

Yes

Replace the power P.C. board.

NOTE: In case both thermistors are more than the above temperature, cool them with cold water etc...

In HEAT mode, for more than 5 minutes, let the ambient temperature thermistor continue to read 5: or below, and let the defrost thermistor continue to read -1: or below.

3 2 1

230V AC

(MUZ-GC25VAH)

(MUZ-GC35VAH)

230V AC

MUZ-GC25VAH Inverter P.C board

MUZ-GC35VAH Power P.C board

Check the following points before checking electric continuity.

1) Does the resistance of ambient temperature thermistor have the characteristics? Refer to 11-6.1.

2) Is the resistance of defrost heater normal? Refer to 11-4.

3) Does the heater protector remain conducted (not open)?

4) Are both ambient temperature thermistor and circuit of defrost heater securely connected to connectors?

26H

CN726

CN722

26H

CN722

Outdoor base gets frozen.

Check of defrost heater

MUZ-GC25VAH MUZ-GC35VAH

Page 39

11-6. Test point diagram and voltage

1. Inverter P.C. board

MUZ-GC25VA MUZ-GC25VAH

Back side of unit

DB61 280V ~ 370V DC

(+)

(-)

230V AC DB61

Smoothing capacitor (C62)

Fuse (F801)

Smoothing capacitor (C61)

Varistor (NR63)

Varistor (NR62)

Varistor (NR61)

Jumper wire for change

in defrost setting (JS)

Output to drive compressor (LDW, LDV, LDU)

LED monitor lamp

Front side of unit

(CN643)

Fin temperature

thermistor/RT64

(CN642)

Defrost thermistor/RT61

(CN641)

Ambient temperature

thermistor /RT65

Discharge temperature

thermistor/RT62

(CN641)

LEV connector (CN724)

R.V.coil (CN721)

Output to drive outdoor fan motor

(CN771)

Fuse (F701)

Heater connector

(CN722)

MUZ-

GC25VAH

Jumper wire for pre-heat

control setting (JK)

Defrost thermistor(RT61) Ambient temperature thermistor(RT65)

100

90 80 70 60 50 40 30

Resistance(k")

20 10

-20 -10 0 10 20 30 40 Temperature(:)

Discharge temperature thermistor(RT62)

700

600

500

400

300

200

Resistance(k")

100

0 10 20 30 40 50 60 70 80 90 100 110 120

Temperature(:)

Fin temperature thermistor(RT64)

200 180 160 140 120 100

80 60

Resistance(k")

40 20

0 1020304050607080

Temperature(:)

Page 40

1. Inverter P.C. board

-20 -10 0 10 20 30 40

100

Temperature(:)

Ambient temperature thermistor(RT65)

Defrost thermistor(RT61)

Temperature(:)

Discharge temperature thermistor(RT62)

0 10 20 30 40 50 60 70 80 90 100 110 120

100

200

300

400

500

600

700

0 1020304050607080

100

120

140

160

180

200

Temperature(:)

Fin temperature thermistor(RT64)

Resistance(k")

MUZ-GC35VA MUZ-GC35VAH

Back side of unit

DB61 280V ~ 370V DC

(+)

(-)

Output to drive compressor (LDW, LDV, LDU)

230V AC DB61

Smoothing capacitor (C63C)

Smoothing capacitor (C63B)

Smoothing capacitor (C63A)

FUSE (F801)

FUSE (F901)

LED monitor lamp

fan motor CN931)

1(+) 2(+) 3(+) 45V 5GND

Rotational frequency

feedback signal of outdoor

Jumper wire for change in defrost setting (JS)

Front side of unit

Connecting wire with power P.C. board (CN725)

LEV connector (CN724)

(CN641)

Defrost thermistor/RT61

(CN641)

Discharge temperature

thermistor/RT62

Ambient temperature

thermistor /RT65

(CN643)

thermistor/RT64

(CN642)

Fin temperature

Output to drive outdoor fan motor

(CN932)

Connector for indoor/ outdoor communication (CN601)

Page 41

2. Power P.C. board

MUZ-GC35VA MUZ-GC35VAH

Back side of unit

Connecting wire with inverter P.C.board (CN726)

FUSE (F71)

Varistor (NR63)

230V AC

Heater connector (CN722)

MUZ-GC35V AH

Varistor (NR62)

Varistor (NR64)

Front side of unit

230V AC

R.V.coil(CN721) 230V AC

Page 42

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

1Slide the sleeve. 2Pull the terminal while

Locking lever

pushing the locking lever.

12-1. MUZ-GC25VA MUZ-GC25VAH

OPERATING PROCEDURE

1. Removing cabinet and panels

(1) Remove the screw fixing the service panel. (See Photo 2.) (2) Pull down the service panel and remove it. (See Photo 2.) (3)

Disconnect the power supply and indoor/outdoor connecting wire. (4) Remove the screws fixing the top panel. (See Photo 1.) (5) Remove the top panel. (See Photo 1.) (6) Remove the screws fixing the cabinet. (See Photo 1.) (7) Remove the cabinet. (8) Remove the screws fixing the back panel. (9) Remove the back panel.

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

1Hold the sleeve, and pull out the terminal slowly.

Connector

NOTE : Turn OFF power supply before disassembling.

PHOTOS

Photo 1

Screws of the top panel

Screws of

the top panel

Photo 2

Screw of the

service panel

Direction to remove

Hooks

Screws of the cabinet

Service

panel

Page 43

OPERATING PROCEDURE

PHOTOS

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

(1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the earth wires (See Photo 3.), the lead wire to

the reactor and the following connectors; <Inverter P.C. board> CN641 (Defrost thermistor and discharge temperature

thermistor) CN643 (Ambient temperature thermistor) CN721 (4-way valve) CN771 (Fan motor) CN724 (LEV) CN772 (Defrost heater GC25VAH)

(3) Disconnect the compressor connector (CN61). (4) Remove the screws fixing the relay panel. (See Photo 3.) (5) Remove the inverter assembly. (See Photo 4.) (6) Remove the inverter P.C. board from the inverter assembly.

3. Removing R.V. coil

(1) Remove the cabinet and panels. (Refer to 1.) (2) Remove the R.V. coil. (See Photo 5.)

Photo 3

Screws of the relay panel

Screw of the earth wires

Photo 4 (Inverter assembly)

Inverter P.C. board

Heat sink

4. Removing the discharge temperature thermistor and defrost thermistor

(1) Remove the cabinet and panels. (Refer to 1.) (2) Pull out the discharge temperature thermistor from its

holder. (See Photo 6.)

(3) Pull out the defrost thermistor from its holder. (See Photo 5.)

Photo 5

R.V. coil

Defrost thermistor

Page 44

OPERATING PROCEDURE

PHOTOS

5. Removing outdoor fan motor

(1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the connectors for outdoor fan motor. (3) Remove the propeller nut. (See Photo 7.) (4) Remove the propeller. (See Photo 7.) (5) Remove the screws fixing the fan motor. (See Photo 7.) (6) Remove the fan motor.

6. Removing the compressor and 4-way valve

(1) Remove the cabinet and panels. (Refer to 1.) (2) Remove the inverter assembly. (Refer to 2.) (3) Recover gas from the refrigerant circuit.

NOTE: Recover gas from the pipes until the pressure

gauge shows 0 kg/cm

(4) Detach the welded part of the suction and the discharge

pipe connected with compressor. (5) Remove the nuts of compressor legs. (6) Remove the compressor. (7) Detach the welded part of pipes connected with 4-way

valve. (See Photo 8.)

(0 MPa).

Photo 6

Discharge temperature thermistor

Photo 7

Propeller

Screws of the outdoor fan motor

Photo 8

Welded parts of 4-way valve

Page 45

12-2. MUZ-GC35VA MUZ-GC35VAH

NOTE : Turn OFF power supply before disassembling.

OPERATING PROCEDURE

1. Removing the cabinet

(1) Remove the screw fixing the service panel. (See Photo 2.) (2) Pull down the service panel and remove it. (See Photo 2.)

Disconnect the power supply and indoor/outdoor connecting wire.

(3) (4) Remove the screws fixing the top panel. (See Photo 1.) (5) Remove the top panel. (See Photo 1.) (6) Remove the screws fixing the cabinet. (7) Remove the cabinet. (8) Remove the screws fixing the back panel. (9) Remove the back panel.

Photo 1

Screws of the top panel

Screws of the cabinet

PHOTOS

Screw of the cabinet

Screws of the top panel

Back panel

Service

panel

Photo 2

Screws of the cabinet

Screw of the

service panel

Direction to remove

Hooks

Page 46

OPERATING PROCEDURE

PHOTOS

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

(1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the earth wires (See Photo 3.), the lead wire to

the reactor and the following connectors; <Power P.C. board> CN721 (4-way valve) CN722 (Defrost heater) MUZ-GC35VAH <Inverter P.C. board> CN931,CN932 (Fan motor) CN641 (Defrost thermistor and discharge temperature

thermistor) CN643 (Ambient temperature thermistor) CN724 (LEV)

(3) Remove the compressor connector (CN61). (4) Remove the screws fixing the relay panel. (See Photo 3.) (5) Remove the inverter assembly. (See Photo 4.) (6) Remove the inverter P.C. board from the inverter assembly. (7) Remove the screw fixing the power P.C. board. (See Photo

4.)

(8) Remove the power P.C. board from the inverter assembly.

Photo 3

Screws of the relay panel

Photo 4 (inverter assembly)

Heat sink

Inverter P.C. board

Screws of the earth wires

Power P.C. board

3. Removing R.V. coil

(1) Remove the cabinet and panels. (Refer to 1.) (2) Remove the R.V. coil. (See Photo 5.)

4. Removing the discharge temperature thermistor and defrost thermistor

(1) Remove the cabinet and panels. (Refer to 1.) (2) Pull out the discharge temperature thermistor from its

holder. (See Photo 5.)

(3) Pull out the defrost thermistor from its holder. (See Photo

6.)

Photo 5

Screw of the power P.C. board

R.V. coil

Discharge temperature thermistor

Page 47

OPERATING PROCEDURE

PHOTOS

5. Removing outdoor fan motor

6. Removing the compressor and 4-way valve

(1) Remove the cabinet and panels. (Refer to 1.) (2) Remove the inverter assembly. (Refer to 2.) (3) Recover gas from the refrigerant circuit.

NOTE: Recover gas from the pipes until the pressure

gauge shows 0kg/cm

(4) Detach the welded part of the suction and the discharge

pipe connected with compressor. (5) Remove the nuts of compressor legs. (6) Remove the compressor. (7) Detach the welded part of pipes connected with 4-way

valve. (See Photo 8.)

(0 MPa).

Photo 6

Photo 7

Defrost thermistor

Screws of the outdoor fan motor

Propeller

Photo 8

Welded parts of 4-way valve

Page 48

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

New publication, effective Jan. 2007 Specifications subject to change without notice.