Mitsubishi MUZ-FD25VABH, MUZ-FD35VABH, MUZ-FD50VABH Service Manual

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Page 1

SPLIT-TYPE AIR CONDITIONERS

OUTDOOR UNIT

SERVICE MANUAL

Models

MUZ-FD25VABH MUZ-FD35VABH MUZ-FD50VABH -

HFC

utilized

R410A

No. OBH519

MUZ-FD25/35

Indoor unit service manual MSZ-FD•VA Series (OBH488)

CONTENTS

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

2. PART NAMES AND FUNCTIONS ····················· 4

3. SPECIFICATION ················································ 5

4. NOISE CRITERIA CURVES ······························ 7

5. OUTLINES AND DIMENSIONS ························ 8

6. WIRING DIAGRAM ············································ 9

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

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

9. ACTUA TOR CONTROL ··································· 24

10. SERVICE FUNCTIONS ···································· 25

11. TROUBLESHOOTING ····································· 26

12. DISASSEMBLY INSTRUCTIONS ···················· 53

PARTS CATALOG (OBB519)

NOTE:

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

Page 2

Page 3

TECHNICAL CHANGES

MUZ-FD25VABH MUZ-FD35VABH MUZ-FD50VABH -

1. New model

E1 E1

Page 4

PART NAMES AND FUNCTIONS

MUZ-FD25VABH MUZ-FD35VABH

MUZ-FD50VABH

Air inlet

(back and side)

Piping

Drain hose

Air outlet

Drain outlet

Air inlet

(back and side)

Piping

Drain hose

Air outlet

Page 5

Capacity Rated frequency (Min.-Max.)

Breaker Capacity A 10 12 16

Electrical data

Coefﬁ cient of performance (C.O.P) 1 (Total)

Compressor

Fan motor

Dimensions W × H × D mm 800 × 550 × 285 840 × 850 × 330 Weight kg 36 55

Special remarks

NOTE : Test conditions are based on ISO 5151.

Cooling : Indoor Dry-bulb temperature 27°C Wet-bulb temperature 19°C Outdoor Dry-bulb temperature 35°C Heating : Indoor Dry-bulb temperature 20°C Outdoor Dry-bulb temperature 7°C Wet-bulb temperature 6°C Refrigerant piping length (one way) : 5 m 1 Measured under rated operating frequency.

SPECIFICATION

Outdoor model MUZ-FD25VABH MUZ-FD35VABH MUZ-FD50VABH

Power supply Single phase, 230 V, 50 Hz

Cooling Heating 3.2 (1.5-6.3) 4.0 (1.3-6.6) 6.0 (1.5-8.2)

Power input 1 (Total)

Running current 1 (Total)

Power factor

Starting current 1 (Total) A 2.9 3.9 7.1

Dehumidiﬁ cation Cooling /h 1.4 2.0 1.7

Air ﬂ ow 1

Sound level 1

Fan speed

Fan speed regulator 3 2 Refrigerant ﬁ lling capacity (R410A) kg 1.15 1.55 Refrigeration oil (Model) NEO22

1 (Total)

Model SNB130FGBH SNB172FDGH Output W 900 1,200

Current

Model RC0J50-EA RC0J60-AA

Current 1

Cooling

Heating

Cooling

Heating

Cooling Heating 600 840 1,610 Cooling Heating 2.9 3.9 7.1 Cooling Heating 90 94 98

Cooling 5.15 4.19 3.31 Heating 5.33 4.76 3.73

Cooling

Heating 2.30 3.23 5.89

Cooling Heating 0.30 0.35

High

Med. – 2,940

Low 1,086 1,680

High 2,016 2,940

Med. 1,776 2,940

Low 1,386 2,100 Cooling Heating 50 56

High

Med. – 800

Low 490 480

High 870 800

Med. 770 800

Low 610 580

dB(A) 46

rpm

2.5 (1.1-3.5) 3.5 (0.8-4.0) 5.0 (1.5-5.8)

485 835 1,510

2.4 3.8 6.7

88 96 98

1.88 3.21 5.45

0.27 0.32

1,872 –

47 54

810 –

0.72

Page 6

Speciﬁ cations and rating conditions of main electric parts

Item

Current transformer

Smoothing capacitor (C61, C62, C63) 620 F 420 V

Diode module

Fuse

Defrost heater (H) 230 V 130 W Intelligent power module (IPM) 20 A 600 V Expansion valve coil (LEV) DC 12 V Reactor (L61) 23.0 mH

Current-detecting resistor

Current-limiting PTC thermistor (PTC64, PTC65) 33  Terminal block (TB1, TB2) 3 P

Relay

R.V.coil (21S4) AC 220 - 240 V Heater protector (26H) Open 45°C IGBT (TR821) 30 A 600 V

(CT761, CT781) 15 A

(F701, F801, F901) T3.15AL250V

(R937, R938, R939) 430 m 2 W

Model

(CT) 20 A

(DB61) 15 A 600 V (DB65) 25 A 600 V

(F61) T20AL250V

(R61, R62) 180 m 5 W (2 elements)

(R825) 25 m 5 W

(X63) 3 A 250 V (X64) 20 A 250 V (X66) 3 A 250 V

MUZ-FD25VABH MUZ-FD35VABH

Model

Item

Current transformer

Smoothing capacitor (CB1, CB2, CB3) 560 F 450 V

Fuse

Defrost heater (H) 230 V 130 W Expansion valve coil (LEV) DC 12 V

Intelligent power module

High pressure switch (HPS) ACB-DB156 Reactor (L) 600 H 20 A Power factor correct module (PFC) 20 A 600 V Current-detecting resistor (PTC64, PTC65) 33 

Current-limiting PTC thermistor

Solenoid coil relay (SSR61) 0.5 A 600 V Terminal block (TB1, TB2) 3 P

Relay

R.V. coil (21S4) AC 220 - 240 V Heater protector (26H) Open 45°C

(RS1, RS2, RS3, RS4)

(CT1, CT2) 20 A

(CT61) 20 A

(F64) T2.0AL250V

(F71, F801) T3.15AL250V

(IPM) 15 A 600 V

(HC930) 3 A 600 V

(R937A, R937B) 1.1  2 W

(X64) 20 A 250 V (X71) 3A 250 V

MUZ-FD50VABH

40 m 7 W (2 elements)

Page 7

NOISE CRITERIA CURVES

MUZ-FD25VABH

FUNCTION

COOLING HEATING

OCTAVE BAND SOUND PRESSURE LEVEL, 0dB re 0.0002 MICRO BAR

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

SPL(dB(A)) LINE

NC-10

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

MUZ-FD35VABH

FUNCTION

COOLING

HEATING

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

SPL(dB(A))

47 50

NC-10

LINE

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

MUZ-FD50VABH

FUNCTION

COOLING

HEATING

OCTAVE BAND SOUND PRESSURE LEVEL, 0dB re 0.0002 MICRO BAR

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

SPL(dB(A)) LINE

54 56

NC-10

Test conditions Cooling : Dry-bulb temperature 35 °C Heating : Dry-bulb temperature 7 °C Wet-bulb temperature 6 °C

OUTDOOR UNIT

1 m

MICROPHONE

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

Page 8

OUTLINES AND DIMENSIONS

MUZ-FD25VABH MUZ-FD35VABH

344.5

285

550

Air in

2 holes 10 × 21

22.3

Handle

280

400

Air in

Air out

150

302.5 500 Bolt pitch for installation

Drain hole ø33

800

17.5

Bolt pitch for

164.5

99.5

REQUIRED SPACE

100 mm or more

304-325

installation

Service panel

Liquid refrigerant pipe joint Refrigerant pipe (flared) ø6.35

170.5

Service port

200 mm or more

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

43°

35°

Gas refrigerant pipe joint Refrigerant pipe (flared) ø9.52

Unit : mm

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

100 mm or more

350 mm or more

MUZ-FD50VABH

Air in

330

170

850

430

Air in

Air out

121

500 840

4 holes 10 × 21

REQUIRED SPACE

100 mm or more

360

Open as a rule 500 mm or more if the back, both sides and top are open

155

Open as a rule 500 mm or more if the front and both sides are open

198

350 mm or more

Service panel

Liquid refrigerant pipe joint Refrigerant pipe

ø6.35

(flared)

30°

35°

Gas refrigerant pipe joint Refrigerant pipe (flared)

ø12.7

100 mm or more 200 mm or more if there are obstacles to both sides

Page 9

MUZ-FD25VABH MUZ-FD35VABH

WIRING DIAGRAM

Page 10

MUZ-FD50VABH

Page 11

REFRIGERANT SYSTEM DIAGRAM

MUZ-FD25VABH MUZ-FD35VABH

Refrigerant pipe ø9.52 (with heat insulator)

Flared connection

Refrigerant pipe ø6.35 (with heat insulator)

Muffler

Stop valve (with service port)

Capillary tube ø

3.0×ø2.0×240

Stop valve (with strainar)

4-way valve

Discharge temperature thermistor RT62

LEV

Muffler

Compressor

Defrost thermistor RT61

Capillary tube ø

3.0×ø1.8×600(×2)

Outdoor heat exchanger

temperature Outdoor heat exchanger

Refrigerant flow in cooling Refrigerant flow in heating

thermistor

RT68

Ambient

temperature

thermistor

RT65

Strainer #100

R.V. coil heating ON cooling OFF

Unit : mm

MUZ-FD50VABH

Refrigerant pipe (with heat insulator)

12.7

Flared connection

Refrigerant pipe ø6.35 (with heat insulator)

4-way valve

Stop valve (with service port)

Receiver

Stop valve

Strainer

#100

Capillary tube

3.6

Muffler

#100

Discharge temperature thermistor RT62

Compressor

2.4×50

LEV

High-pressure switch

Defrost thermistor RT61

Strainer

#100

Refrigerant flow in cooling Refrigerant flow in heating

Outdoor heat exchanger

Outdoor heat exchanger temperature thermistor RT68

R.V. coil heating ON cooling OFF

Unit : mm

Ambient temperature thermistor RT65

Page 12

MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE

Refrigerant piping : m

MUZ-FD25 MUZ-FD35

Max. Length

20 12 9.52

Max. Height difference

MUZ-FD50 30 15 12.7

Indoor unit

Max. Height

difference

Max. Length A

Outdoor unit

Piping size O.D : mm

Gas Liquid

ADDITIONAL REFRIGERANT CHARGE (R410A : g)

Model

MUZ-FD25 MUZ-FD35

Outdoor unit

precharged

1,150

5 m 6 m 7 m 8 m 9 m 10 m 11 m 12 m 13 m 14 m 15 m 20 m

0 0 0 90 120 150 180 210 240 270 300 450

Refrigerant piping length (one way)

6.35

Calculation : X g = 30 g/m × (Refrigerant piping length (m) - 5)

Model

Outdoor unit

precharged

7 m 10 m 15 m 20 m 25 m 30 m

Refrigerant piping length (one way)

MUZ-FD50 1,550 0 90 240 390 540 690

Calculation : X g = 30 g/m × (Refrigerant piping length (m) - 7)

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

Page 13

PERFORMANCE CURVES8

MUZ-FD25VABH MUZ-FD35VABH MUZ-FD50VABH

The standard specifications apply only to the operation of the air conditioner under normal conditions. Since operating condi-

tions 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 - 264 V, 50 Hz

(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 OUTDOOR UNIT

Wet and dry-bulb thermometers

8-1. CAPACITY AND INPUT CURVES

6.5

6.0

5.5

5.1

4.6

difference (°C)

4.1

3.7

Indoor air Wet-bulb temperature

9.1

8.4

7.7

7.0

6.3

5.7

5.1

10.1

9.3

8.5

7.7

7.0

6.3

5.6

1.5

1.4

1.3

1.2

1.1

1.0

Capacity correction factors

0.9

-10-5 0 5 1015202530354045

Cooling capacity (

Outdoor intake air Dry-bulb temperature(°C)

Wet and dry-bulb thermometers

at Rated frequency)

Indoor intake air Wet-bulb temperature( )

22 20 18

MUZ-FD25VABH

MUZ-FD35VABH

MUZ-FD50VABH

Page 14

5.5

5.1

4.6

4.1

difference (°C)

3.7

3.3

Indoor air Wet-bulb temperature

7.7

7.0

6.3

5.7

5.1

4.5

8.5

7.7

7.0

6.3

5.6

4.9

1.3

1.2

1.1

1.0

0.9

Input correction factors

0.8

Total input (Cooling :

at Rated frequency

)

20 18

Indoor intake air Wet-bulb temperature(°C)

-10-5 0 5 1015202530354045

Outdoor intake air Dry-bulb temperature (°C)

MUZ-FD25VABH

20.9

19.3

17.7

16.1

14.5

12.9

11.3

20.9

19.3

17.7

16.1

14.5

12.9

11.3

9.7

8.0

6.4

MUZ-FD35VABH

9.7

8.0

6.4

MUZ-FD35VABH

26.9

24.8

22.7

20.7

18.6

16.5

14.5

12.4

10.3

MUZ-FD25VABH

17.3

16.0

14.6

13.3

12.0

10.6

9.3

8.0

difference (°C)

6.7

5.3

Indoor air Dry-bulb temperature

17.3

16.0

14.6

13.3

12.0

10.6

9.3

8.0

difference (°C)

6.7

5.3

Indoor air Dry-bulb temperature

MUZ-FD50VABH

26.9

24.8

22.7

20.7

18.6

16.5

14.5

12.4

10.3

1.3

1.2

1.1

1.0

0.9

0.8

0.7

0.6

0.5

Capacity correction factor

8.3

0.4

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

MUZ-FD50VABH

1.3

1.2

1.1

1.0

0.9

0.8

0.7

0.6

Input correction factor

0.5

8.3

0.4

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

Heating capacity (

Indoor intake air Dry-bulb temperature ( )

at Rated frequency)

Outdoor intake air Wet-bulb temperature (°C)

Total input (Heating :

Indoor intake air Dry-bulb temperature (

at Rated frequency

)

Outdoor intake air Wet-bulb temperature (°C)

)

°C

20 15

MUZ-FD25VABH

MUZ-FD35VABH

MUZ-FD50VABH

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-FD25VABH

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

MUZ-FD35VABH

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

Correction of Cooling input

2.5

2.0

1.5

1.0

0.5

Input correction factors

0.0 0 50 100 150(Hz)

The operational frequency of compressor

Correction of Cooling input

1.5

1.0

0.5

Input 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

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

Correction of Heating input

Input correction factors

0 50 100 150(Hz)

The operational frequency of compressor

Correction of Heating input

Capacity correction factors

0 50 100 150(Hz)

The operational frequency of compressor

MUZ-FD50VABH

Correction of Cooling capacity

1.5

1.0

0.5

Capacity correction factors

0.0 0 50 100

The operational frequency of

compressor (Hz)

Correction of Cooling input

2.0

1.5

1.0

0.5

Input correction factors

0.0 0 50 100

The operational frequency of

compressor (Hz)

Correction of Heating capacity

1.5

1.0

0.5

Capacity correction factors

0.0 0 50 100 150

The operational frequency of

compressor (Hz)

Correction of Heating input

2.0

1.5

1.0

0.5

Capacity correction factors

0.0 050100150

The operational frequency of

compressor (Hz)

8-3. TEST RUN OPERATION (How to operate fixed-frequency operation)

1. Press EMERGENCY OPERATION switch to start COOL or HEAT mode (COOL : Press once, HEAT : Press twice).

2. Test run operation starts and continues to operate for 30 minutes.

3. Compressor operates at rated frequency in COOL mode or 58 Hz in HEAT mode.

4. Indoor fan operates at High speed.

5. After 30 minutes, test run operation finishes and EMERGENCY OPERATION starts (operation frequency of compressor varies).

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

Page 16

8-4. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT

COOL operation

Both indoor and outdoor unit are under the same temperature/

humidity condition.

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

Dry-bulb temperature (°C) Relative humidity (%)

Outdoor low pressure

20 50 25 60 30 70

MUZ-FD25VABH

1.4

1.2

1.0

MPa [Gauge]

0.8

0.6

0.4

0.2 15 20 25 30 35

50 60 70

Ambient temperature(°C) Ambient humidity(%)

14 12 10 8 6 4

[Gauge]

kgf/cm

MUZ-FD35VABH

1.4

1.2

1.0

MPa [Gauge]

0.8

0.6

0.4

0.2 15 20 25 30 35

50 60 70

Ambient temperature(°C) Ambient humidity(%)

14 12 10 8 6 4

[Gauge]

kgf/cm

MUZ-FD50VABH

1.4

1.2

1.0

MPa [Gauge]

0.8

0.6

0.4

0.2 15 20 25 30 35

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/cm

[Gauge])

Outdoor unit current

MUZ-FD25VABH

(A) (A)

2.4

2.2

2.0

MUZ-FD35VABH

4.0

3.5

3.0

MUZ-FD50VABH

(A)

6.5

6.0

5.5

5.0

50 60 70

Ambient temperature(°C) Ambient humidity(%)

14 12 10 8 6 4

[Gauge]

kgf/cm

1.8 15 205025

Ambient temperature (°C) Ambient humidity (%)

307035

2.5 15 205025

Ambient temperature (°C) Ambient humidity (%)

HEAT operation

Condition :

Dry bulb temperature (°C) 20.0 2 7 15 20.0 Wet bulb temperature (°C) 14.5 1 6 12 14.5

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

Outdoor unit current

MUZ-FD25VABH MUZ-FD35VABH

6.0

(A) (A)

5.5

5.0

4.5

4.0 510152025

Ambient temperature (°C)

Indoor Outdoor

6.0

5.5

5.0

4.5

4.0 2

510152025

Ambient temperature (°C)

4.5

30 70

15 20 25 30 35

50 60 70

Ambient temperature (°C) Ambient humidity (%)

MUZ-FD50VABH

8.5

(A)

8.0

7.5

7.0

6.5

6.0 02 5 10 15 20 25

Ambient temperature (°C)

Page 17

PERFORMANCE DATA COOL operation at Rated frequency

MUZ-FD25VABH

CAPACITY : 2.5 kW SHF : 0.85 INPUT : 485 W

INDOOR

DB (°C)

INDOOR

WB (°C)

21 18 2.94 1.97 0.67 388 2.81 1.88 0.67 407 2.70 1.81 0.67 427 2.60 1.74 0.67 446

21 20 3.06 1.68 0.55 407 2.94 1.62 0.55 432 2.85 1.57 0.55 441 2.75 1.51 0.55 461

22 18 2.94 2.09 0.71 388 2.81 2.00 0.71 407 2.70 1.92 0.71 427 2.60 1.85 0.71 446

22 20 3.06 1.81 0.59 407 2.94 1.73 0.59 432 2.85 1.68 0.59 441 2.75 1.62 0.59 461

22 22 3.19 1.50 0.47 422 3.08 1.45 0.47 449 3.00 1.41 0.47 461 2.88 1.35 0.47 480

23 18 2.94 2.20 0.75 388 2.81 2.11 0.75 407 2.70 2.03 0.75 427 2.60 1.95 0.75 446

23 20 3.06 1.93 0.63 407 2.94 1.85 0.63 432 2.85 1.80 0.63 441 2.75 1.73 0.63 461

23 22 3.19 1.63 0.51 422 3.08 1.57 0.51 449 3.00 1.53 0.51 461 2.88 1.47 0.51 480

24 18 2.94 2.32 0.79 388 2.81 2.22 0.79 407 2.70 2.13 0.79 427 2.60 2.05 0.79 446

24 20 3.06 2.05 0.67 407 2.94 1.97 0.67 432 2.85 1.91 0.67 441 2.75 1.84 0.67 461

24 22 3.19 1.75 0.55 422 3.08 1.69 0.55 449 3.00 1.65 0.55 461 2.88 1.58 0.55 480

24 24 3.35 1.44 0.43 441 3.23 1.39 0.43 466 3.15 1.35 0.43 480 3.05 1.31 0.43 504

25 18 2.94 2.44 0.83 388 2.81 2.33 0.83 407 2.70 2.24 0.83 427 2.60 2.16 0.83 446

25 20 3.06 2.17 0.71 407 2.94 2.09 0.71 432 2.85 2.02 0.71 441 2.75 1.95 0.71 461

25 22 3.19 1.88 0.59 422 3.08 1.81 0.59 449 3.00 1.77 0.59 461 2.88 1.70 0.59 480

25 24 3.35 1.57 0.47 441 3.23 1.52 0.47 466 3.15 1.48 0.47 480 3.05 1.43 0.47 504

26 18 2.94 2.56 0.87 388 2.81 2.45 0.87 407 2.70 2.35 0.87 427 2.60 2.26 0.87 446

26 20 3.06 2.30 0.75 407 2.94 2.20 0.75 432 2.85 2.14 0.75 441 2.75 2.06 0.75 461

26 22 3.19 2.01 0.63 422 3.08 1.94 0.63 449 3.00 1.89 0.63 461 2.88 1.81 0.63 480

26 24 3.35 1.71 0.51 441 3.23 1.64 0.51 466 3.15 1.61 0.51 480 3.05 1.56 0.51 504

26 26 3.45 1.35 0.39 466 3.35 1.31 0.39 490 3.30 1.29 0.39 504 3.20 1.25 0.39 519

27 18 2.94 2.67 0.91 388 2.81 2.56 0.91 407 2.70 2.46 0.91 427 2.60 2.37 0.91 446

27 20 3.06 2.42 0.79 407 2.94 2.32 0.79 432 2.85 2.25 0.79 441 2.75 2.17 0.79 461

27 22 3.19 2.14 0.67 422 3.08 2.06 0.67 449 3.00 2.01 0.67 461 2.88 1.93 0.67 480

27 24 3.35 1.84 0.55 441 3.23 1.77 0.55 466 3.15 1.73 0.55 480 3.05 1.68 0.55 504

27 26 3.45 1.48 0.43 466 3.35 1.44 0.43 490 3.30 1.42 0.43 504 3.20 1.38 0.43 519

28 18 2.94 2.79 0.95 388 2.81 2.67 0.95 407 2.70 2.57 0.95 427 2.60 2.47 0.95 446

28 20 3.06 2.54 0.83 407 2.94 2.44 0.83 432 2.85 2.37 0.83 441 2.75 2.28 0.83 461

28 22 3.19 2.26 0.71 422 3.08 2.18 0.71 449 3.00 2.13 0.71 461 2.88 2.04 0.71 480

28 24 3.35 1.98 0.59 441 3.23 1.90 0.59 466 3.15 1.86 0.59 480 3.05 1.80 0.59 504

28 26 3.45 1.62 0.47 466 3.35 1.57 0.47 490 3.30 1.55 0.47 504 3.20 1.50 0.47 519

29 18 2.94 2.91 0.99 388 2.81 2.78 0.99 407 2.70 2.67 0.99 427 2.60 2.57 0.99 446

29 20 3.06 2.66 0.87 407 2.94 2.56 0.87 432 2.85 2.48 0.87 441 2.75 2.39 0.87 461

29 22 3.19 2.39 0.75 422 3.08 2.31 0.75 449 3.00 2.25 0.75 461 2.88 2.16 0.75 480

29 24 3.35 2.11 0.63 441 3.23 2.03 0.63 466 3.15 1.98 0.63 480 3.05 1.92 0.63 504

29 26 3.45 1.76 0.51 466 3.35 1.71 0.51 490 3.30 1.68 0.51 504 3.20 1.63 0.51 519

30 18 2.94 2.94 1.00 388 2.81 2.81 1.00 407 2.70 2.70 1.00 427 2.60 2.60 1.00 446

30 20 3.06 2.79 0.91 407 2.94 2.67 0.91 432 2.85 2.59 0.91 441 2.75 2.50 0.91 461

30 22 3.19 2.52 0.79 422 3.08 2.43 0.79 449 3.00 2.37 0.79 461 2.88 2.27 0.79 480

30 24 3.35 2.24 0.67 441 3.23 2.16 0.67 466 3.15 2.11 0.67 480 3.05 2.04 0.67 504

30 26 3.45 1.90 0.55 466 3.35 1.84 0.55 490 3.30 1.82 0.55 504 3.20 1.76 0.55 519

31 18 2.94 2.94 1.00 388 2.81 2.81 1.00 407 2.70 2.70 1.00 427 2.60 2.60 1.00 446

31 20 3.06 2.91 0.95 407 2.94 2.79 0.95 432 2.85 2.71 0.95 441 2.75 2.61 0.95 461

31 22 3.19 2.65 0.83 422 3.08 2.55 0.83 449 3.00 2.49 0.83 461 2.88 2.39 0.83 480

31 24 3.35 2.38 0.71 441 3.23 2.29 0.71 466 3.15 2.24 0.71 480 3.05 2.17 0.71 504

31 26 3.45 2.04 0.59 466 3.35 1.98 0.59 490 3.30 1.95 0.59 504 3.20 1.89 0.59 519

32 18 2.94 2.94 1.00 388 2.81 2.81 1.00 407 2.70 2.70 1.00 427 2.60 2.60 1.00 446

32 20 3.06 3.03 0.99 407 2.94 2.91 0.99 432 2.85 2.82 0.99 441 2.75 2.72 0.99 461

32 22 3.19 2.77 0.87 422 3.08 2.68 0.87 449 3.00 2.61 0.87 461 2.88 2.50 0.87 480

32 24 3.35 2.51 0.75 441 3.23 2.42 0.75 466 3.15 2.36 0.75 480 3.05 2.29 0.75 504

32 26 3.45 2.17 0.63 466 3.35 2.11 0.63 490 3.30 2.08 0.63 504 3.20 2.02 0.63 519

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

21 25 27 30

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

OUTDOOR DB (°C)

Page 18

PERFORMANCE DATA COOL operation at Rated frequency

MUZ-FD25VABH

CAPACITY : 2.5 kW SHF : 0.85 INPUT : 485 W

INDOOR

DB (°C)

INDOOR

WB (°C)

21 18 2.45 1.64 0.67 475 2.25 1.51 0.67 504 2.08 1.39 0.67 524

21 20 2.58 1.42 0.55 495 2.40 1.32 0.55 519 2.23 1.22 0.55 548

22 18 2.45 1.74 0.71 475 2.25 1.60 0.71 504 2.08 1.47 0.71 524

22 20 2.58 1.52 0.59 495 2.40 1.42 0.59 519 2.23 1.31 0.59 548

22 22 2.73 1.28 0.47 514 2.55 1.20 0.47 543 2.38 1.12 0.47 563

23 18 2.45 1.84 0.75 475 2.25 1.69 0.75 504 2.08 1.56 0.75 524

23 20 2.58 1.62 0.63 495 2.40 1.51 0.63 519 2.23 1.40 0.63 548

23 22 2.73 1.39 0.51 514 2.55 1.30 0.51 543 2.38 1.21 0.51 563

24 18 2.45 1.94 0.79 475 2.25 1.78 0.79 504 2.08 1.64 0.79 524

24 20 2.58 1.73 0.67 495 2.40 1.61 0.67 519 2.23 1.49 0.67 548

24 22 2.73 1.50 0.55 514 2.55 1.40 0.55 543 2.38 1.31 0.55 563

24 24 2.88 1.24 0.43 534 2.70 1.16 0.43 558 2.55 1.10 0.43 582

25 18 2.45 2.03 0.83 475 2.25 1.87 0.83 504 2.08 1.72 0.83 524

25 20 2.58 1.83 0.71 495 2.40 1.70 0.71 519 2.23 1.58 0.71 548

25 22 2.73 1.61 0.59 514 2.55 1.50 0.59 543 2.38 1.40 0.59 563

25 24 2.88 1.35 0.47 534 2.70 1.27 0.47 558 2.55 1.20 0.47 582

26 18 2.45 2.13 0.87 475 2.25 1.96 0.87 504 2.08 1.81 0.87 524

26 20 2.58 1.93 0.75 495 2.40 1.80 0.75 519 2.23 1.67 0.75 548

26 22 2.73 1.72 0.63 514 2.55 1.61 0.63 543 2.38 1.50 0.63 563

26 24 2.88 1.47 0.51 534 2.70 1.38 0.51 558 2.55 1.30 0.51 582

26 26 3.03 1.18 0.39 553 2.85 1.11 0.39 577 2.68 1.04 0.39 601

27 18 2.45 2.23 0.91 475 2.25 2.05 0.91 504 2.08 1.89 0.91 524

27 20 2.58 2.03 0.79 495 2.40 1.90 0.79 519 2.23 1.76 0.79 548

27 22 2.73 1.83 0.67 514 2.55 1.71 0.67 543 2.38 1.59 0.67 563

27 24 2.88 1.58 0.55 534 2.70 1.49 0.55 558 2.55 1.40 0.55 582

27 26 3.03 1.30 0.43 553 2.85 1.23 0.43 577 2.68 1.15 0.43 601

28 18 2.45 2.33 0.95 475 2.25 2.14 0.95 504 2.08 1.97 0.95 524

28 20 2.58 2.14 0.83 495 2.40 1.99 0.83 519 2.23 1.85 0.83 548

28 22 2.73 1.93 0.71 514 2.55 1.81 0.71 543 2.38 1.69 0.71 563

28 24 2.88 1.70 0.59 534 2.70 1.59 0.59 558 2.55 1.50 0.59 582

28 26 3.03 1.42 0.47 553 2.85 1.34 0.47 577 2.68 1.26 0.47 601

29 18 2.45 2.43 0.99 475 2.25 2.23 0.99 504 2.08 2.05 0.99 524

29 20 2.58 2.24 0.87 495 2.40 2.09 0.87 519 2.23 1.94 0.87 548

29 22 2.73 2.04 0.75 514 2.55 1.91 0.75 543 2.38 1.78 0.75 563

29 24 2.88 1.81 0.63 534 2.70 1.70 0.63 558 2.55 1.61 0.63 582

29 26 3.03 1.54 0.51 553 2.85 1.45 0.51 577 2.68 1.36 0.51 601

30 18 2.45 2.45 1.00 475 2.25 2.25 1.00 504 2.08 2.08 1.00 524

30 20 2.58 2.34 0.91 495 2.40 2.18 0.91 519 2.23 2.02 0.91 548

30 22 2.73 2.15 0.79 514 2.55 2.01 0.79 543 2.38 1.88 0.79 563

30 24 2.88 1.93 0.67 534 2.70 1.81 0.67 558 2.55 1.71 0.67 582

30 26 3.03 1.66 0.55 553 2.85 1.57 0.55 577 2.68 1.47 0.55 601

31 18 2.45 2.45 1.00 475 2.25 2.25 1.00 504 2.08 2.08 1.00 524

31 20 2.58 2.45 0.95 495 2.40 2.28 0.95 519 2.23 2.11 0.95 548

31 22 2.73 2.26 0.83 514 2.55 2.12 0.83 543 2.38 1.97 0.83 563

31 24 2.88 2.04 0.71 534 2.70 1.92 0.71 558 2.55 1.81 0.71 582

31 26 3.03 1.78 0.59 553 2.85 1.68 0.59 577 2.68 1.58 0.59 601

32 18 2.45 2.45 1.00 475 2.25 2.25 1.00 504 2.08 2.08 1.00 524

32 20 2.58 2.55 0.99 495 2.40 2.38 0.99 519 2.23 2.20 0.99 548

32 22 2.73 2.37 0.87 514 2.55 2.22 0.87 543 2.38 2.07 0.87 563

32 24 2.88 2.16 0.75 534 2.70 2.03 0.75 558 2.55 1.91 0.75 582

32 26 3.03 1.91 0.63 553 2.85 1.80 0.63 577 2.68 1.69 0.63 601

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

35 40 46

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

OUTDOOR DB (°C)

Page 19

PERFORMANCE DATA COOL operation at Rated frequency

MUZ-FD35VABH

CAPACITY : 3.5 kW SHF : 0.85 INPUT : 835 W

INDOOR

DB (°C)

INDOOR

WB (°C)

21 18 4.11 2.76 0.67 668 3.94 2.64 0.67 701 3.78 2.53 0.67 735 3.64 2.44 0.67 768

21 20 4.29 2.36 0.55 701 4.11 2.26 0.55 743 3.99 2.19 0.55 760 3.85 2.12 0.55 793

22 18 4.11 2.92 0.71 668 3.94 2.80 0.71 701 3.78 2.68 0.71 735 3.64 2.58 0.71 768

22 20 4.29 2.53 0.59 701 4.11 2.43 0.59 743 3.99 2.35 0.59 760 3.85 2.27 0.59 793

22 22 4.46 2.10 0.47 726 4.31 2.02 0.47 772 4.20 1.97 0.47 793 4.03 1.89 0.47 827

23 18 4.11 3.08 0.75 668 3.94 2.95 0.75 701 3.78 2.84 0.75 735 3.64 2.73 0.75 768

23 20 4.29 2.70 0.63 701 4.11 2.59 0.63 743 3.99 2.51 0.63 760 3.85 2.43 0.63 793

23 22 4.46 2.28 0.51 726 4.31 2.20 0.51 772 4.20 2.14 0.51 793 4.03 2.05 0.51 827

24 18 4.11 3.25 0.79 668 3.94 3.11 0.79 701 3.78 2.99 0.79 735 3.64 2.88 0.79 768

24 20 4.29 2.87 0.67 701 4.11 2.76 0.67 743 3.99 2.67 0.67 760 3.85 2.58 0.67 793

24 22 4.46 2.45 0.55 726 4.31 2.37 0.55 772 4.20 2.31 0.55 793 4.03 2.21 0.55 827

24 24 4.69 2.02 0.43 760 4.52 1.94 0.43 802 4.41 1.90 0.43 827 4.27 1.84 0.43 868

25 18 4.11 3.41 0.83 668 3.94 3.27 0.83 701 3.78 3.14 0.83 735 3.64 3.02 0.83 768

25 20 4.29 3.04 0.71 701 4.11 2.92 0.71 743 3.99 2.83 0.71 760 3.85 2.73 0.71 793

25 22 4.46 2.63 0.59 726 4.31 2.54 0.59 772 4.20 2.48 0.59 793 4.03 2.37 0.59 827

25 24 4.69 2.20 0.47 760 4.52 2.12 0.47 802 4.41 2.07 0.47 827 4.27 2.01 0.47 868

26 18 4.11 3.58 0.87 668 3.94 3.43 0.87 701 3.78 3.29 0.87 735 3.64 3.17 0.87 768

26 20 4.29 3.22 0.75 701 4.11 3.08 0.75 743 3.99 2.99 0.75 760 3.85 2.89 0.75 793

26 22 4.46 2.81 0.63 726 4.31 2.71 0.63 772 4.20 2.65 0.63 793 4.03 2.54 0.63 827

26 24 4.69 2.39 0.51 760 4.52 2.30 0.51 802 4.41 2.25 0.51 827 4.27 2.18 0.51 868

26 26 4.83 1.88 0.39 802 4.69 1.83 0.39 843 4.62 1.80 0.39 868 4.48 1.75 0.39 893

27 18 4.11 3.74 0.91 668 3.94 3.58 0.91 701 3.78 3.44 0.91 735 3.64 3.31 0.91 768

27 20 4.29 3.39 0.79 701 4.11 3.25 0.79 743 3.99 3.15 0.79 760 3.85 3.04 0.79 793

27 22 4.46 2.99 0.67 726 4.31 2.88 0.67 772 4.20 2.81 0.67 793 4.03 2.70 0.67 827

27 24 4.69 2.58 0.55 760 4.52 2.48 0.55 802 4.41 2.43 0.55 827 4.27 2.35 0.55 868

27 26 4.83 2.08 0.43 802 4.69 2.02 0.43 843 4.62 1.99 0.43 868 4.48 1.93 0.43 893

28 18 4.11 3.91 0.95 668 3.94 3.74 0.95 701 3.78 3.59 0.95 735 3.64 3.46 0.95 768

28 20 4.29 3.56 0.83 701 4.11 3.41 0.83 743 3.99 3.31 0.83 760 3.85 3.20 0.83 793

28 22 4.46 3.17 0.71 726 4.31 3.06 0.71 772 4.20 2.98 0.71 793 4.03 2.86 0.71 827

28 24 4.69 2.77 0.59 760 4.52 2.66 0.59 802 4.41 2.60 0.59 827 4.27 2.52 0.59 868

28 26 4.83 2.27 0.47 802 4.69 2.20 0.47 843 4.62 2.17 0.47 868 4.48 2.11 0.47 893

29 18 4.11 4.07 0.99 668 3.94 3.90 0.99 701 3.78 3.74 0.99 735 3.64 3.60 0.99 768

29 20 4.29 3.73 0.87 701 4.11 3.58 0.87 743 3.99 3.47 0.87 760 3.85 3.35 0.87 793

29 22 4.46 3.35 0.75 726 4.31 3.23 0.75 772 4.20 3.15 0.75 793 4.03 3.02 0.75 827

29 24 4.69 2.95 0.63 760 4.52 2.84 0.63 802 4.41 2.78 0.63 827 4.27 2.69 0.63 868

29 26 4.83 2.46 0.51 802 4.69 2.39 0.51 843 4.62 2.36 0.51 868 4.48 2.28 0.51 893

30 18 4.11 4.11 1.00 668 3.94 3.94 1.00 701 3.78 3.78 1.00 735 3.64 3.64 1.00 768

30 20 4.29 3.90 0.91 701 4.11 3.74 0.91 743 3.99 3.63 0.91 760 3.85 3.50 0.91 793

30 22 4.46 3.53 0.79 726 4.31 3.40 0.79 772 4.20 3.32 0.79 793 4.03 3.18 0.79 827

30 24 4.69 3.14 0.67 760 4.52 3.03 0.67 802 4.41 2.95 0.67 827 4.27 2.86 0.67 868

30 26 4.83 2.66 0.55 802 4.69 2.58 0.55 843 4.62 2.54 0.55 868 4.48 2.46 0.55 893

31 18 4.11 4.11 1.00 668 3.94 3.94 1.00 701 3.78 3.78 1.00 735 3.64 3.64 1.00 768

31 20 4.29 4.07 0.95 701 4.11 3.91 0.95 743 3.99 3.79 0.95 760 3.85 3.66 0.95 793

31 22 4.46 3.70 0.83 726 4.31 3.57 0.83 772 4.20 3.49 0.83 793 4.03 3.34 0.83 827

31 24 4.69 3.33 0.71 760 4.52 3.21 0.71 802 4.41 3.13 0.71 827 4.27 3.03 0.71 868

31 26 4.83 2.85 0.59 802 4.69 2.77 0.59 843 4.62 2.73 0.59 868 4.48 2.64 0.59 893

32 18 4.11 4.11 1.00 668 3.94 3.94 1.00 701 3.78 3.78 1.00 735 3.64 3.64 1.00 768

32 20 4.29 4.24 0.99 701 4.11 4.07 0.99 743 3.99 3.95 0.99 760 3.85 3.81 0.99 793

32 22 4.46 3.88 0.87 726 4.31 3.75 0.87 772 4.20 3.65 0.87 793 4.03 3.50 0.87 827

32 24 4.69 3.52 0.75 760 4.52 3.39 0.75 802 4.41 3.31 0.75 827 4.27 3.20 0.75 868

32 26 4.83 3.04 0.63 802 4.69 2.95 0.63 843 4.62 2.91 0.63 868 4.48 2.82 0.63 893

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

21 25 27 30

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

OUTDOOR DB (°C)

Page 20

PERFORMANCE DATA COOL operation at Rated frequency

MUZ-FD35VABH

CAPACITY : 3.5 kW SHF : 0.85 INPUT : 835 W

INDOOR

DB (°C)

INDOOR

WB (°C)

21 18 3.43 2.30 0.67 818 3.15 2.11 0.67 868 2.91 1.95 0.67 902

21 20 3.61 1.98 0.55 852 3.36 1.85 0.55 893 3.12 1.71 0.55 944

22 18 3.43 2.44 0.71 818 3.15 2.24 0.71 868 2.91 2.06 0.71 902

22 20 3.61 2.13 0.59 852 3.36 1.98 0.59 893 3.12 1.84 0.59 944

22 22 3.82 1.79 0.47 885 3.57 1.68 0.47 935 3.33 1.56 0.47 969

23 18 3.43 2.57 0.75 818 3.15 2.36 0.75 868 2.91 2.18 0.75 902

23 20 3.61 2.27 0.63 852 3.36 2.12 0.63 893 3.12 1.96 0.63 944

23 22 3.82 1.95 0.51 885 3.57 1.82 0.51 935 3.33 1.70 0.51 969

24 18 3.43 2.71 0.79 818 3.15 2.49 0.79 868 2.91 2.29 0.79 902

24 20 3.61 2.42 0.67 852 3.36 2.25 0.67 893 3.12 2.09 0.67 944

24 22 3.82 2.10 0.55 885 3.57 1.96 0.55 935 3.33 1.83 0.55 969

24 24 4.03 1.73 0.43 919 3.78 1.63 0.43 960 3.57 1.54 0.43 1002

25 18 3.43 2.85 0.83 818 3.15 2.61 0.83 868 2.91 2.41 0.83 902

25 20 3.61 2.56 0.71 852 3.36 2.39 0.71 893 3.12 2.21 0.71 944

25 22 3.82 2.25 0.59 885 3.57 2.11 0.59 935 3.33 1.96 0.59 969

25 24 4.03 1.89 0.47 919 3.78 1.78 0.47 960 3.57 1.68 0.47 1002

26 18 3.43 2.98 0.87 818 3.15 2.74 0.87 868 2.91 2.53 0.87 902

26 20 3.61 2.70 0.75 852 3.36 2.52 0.75 893 3.12 2.34 0.75 944

26 22 3.82 2.40 0.63 885 3.57 2.25 0.63 935 3.33 2.09 0.63 969

26 24 4.03 2.05 0.51 919 3.78 1.93 0.51 960 3.57 1.82 0.51 1002

26 26 4.24 1.65 0.39 952 3.99 1.56 0.39 994 3.75 1.46 0.39 1035

27 18 3.43 3.12 0.91 818 3.15 2.87 0.91 868 2.91 2.64 0.91 902

27 20 3.61 2.85 0.79 852 3.36 2.65 0.79 893 3.12 2.46 0.79 944

27 22 3.82 2.56 0.67 885 3.57 2.39 0.67 935 3.33 2.23 0.67 969

27 24 4.03 2.21 0.55 919 3.78 2.08 0.55 960 3.57 1.96 0.55 1002

27 26 4.24 1.82 0.43 952 3.99 1.72 0.43 994 3.75 1.61 0.43 1035

28 18 3.43 3.26 0.95 818 3.15 2.99 0.95 868 2.91 2.76 0.95 902

28 20 3.61 2.99 0.83 852 3.36 2.79 0.83 893 3.12 2.59 0.83 944

28 22 3.82 2.71 0.71 885 3.57 2.53 0.71 935 3.33 2.36 0.71 969

28 24 4.03 2.37 0.59 919 3.78 2.23 0.59 960 3.57 2.11 0.59 1002

28 26 4.24 1.99 0.47 952 3.99 1.88 0.47 994 3.75 1.76 0.47 1035

29 18 3.43 3.40 0.99 818 3.15 3.12 0.99 868 2.91 2.88 0.99 902

29 20 3.61 3.14 0.87 852 3.36 2.92 0.87 893 3.12 2.71 0.87 944

29 22 3.82 2.86 0.75 885 3.57 2.68 0.75 935 3.33 2.49 0.75 969

29 24 4.03 2.54 0.63 919 3.78 2.38 0.63 960 3.57 2.25 0.63 1002

29 26 4.24 2.16 0.51 952 3.99 2.03 0.51 994 3.75 1.91 0.51 1035

30 18 3.43 3.43 1.00 818 3.15 3.15 1.00 868 2.91 2.91 1.00 902

30 20 3.61 3.28 0.91 852 3.36 3.06 0.91 893 3.12 2.83 0.91 944

30 22 3.82 3.01 0.79 885 3.57 2.82 0.79 935 3.33 2.63 0.79 969

30 24 4.03 2.70 0.67 919 3.78 2.53 0.67 960 3.57 2.39 0.67 1002

30 26 4.24 2.33 0.55 952 3.99 2.19 0.55 994 3.75 2.06 0.55 1035

31 18 3.43 3.43 1.00 818 3.15 3.15 1.00 868 2.91 2.91 1.00 902

31 20 3.61 3.42 0.95 852 3.36 3.19 0.95 893 3.12 2.96 0.95 944

31 22 3.82 3.17 0.83 885 3.57 2.96 0.83 935 3.33 2.76 0.83 969

31 24 4.03 2.86 0.71 919 3.78 2.68 0.71 960 3.57 2.53 0.71 1002

31 26 4.24 2.50 0.59 952 3.99 2.35 0.59 994 3.75 2.21 0.59 1035

32 18 3.43 3.43 1.00 818 3.15 3.15 1.00 868 2.91 2.91 1.00 902

32 20 3.61 3.57 0.99 852 3.36 3.33 0.99 893 3.12 3.08 0.99 944

32 22 3.82 3.32 0.87 885 3.57 3.11 0.87 935 3.33 2.89 0.87 969

32 24 4.03 3.02 0.75 919 3.78 2.84 0.75 960 3.57 2.68 0.75 1002

32 26 4.24 2.67 0.63 952 3.99 2.51 0.63 994 3.75 2.36 0.63 1035

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

35 40 46

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

OUTDOOR DB (°C)

Page 21

PERFORMANCE DATA COOL operation at Rated frequency

MUZ-FD50VABH

CAPACITY : 5.0 kW SHF : 0.77 INPUT : 1510 W

INDOOR

DB (°C)

INDOOR

WB (°C)

21 18 5.88 3.47 0.59 1208 5.63 3.32 0.59 1268 5.40 3.19 0.59 1329 5.20 3.07 0.59 1389

21 20 6.13 2.88 0.47 1268 5.88 2.76 0.47 1344 5.70 2.68 0.47 1374 5.50 2.59 0.47 1435

22 18 5.88 3.70 0.63 1208 5.63 3.54 0.63 1268 5.40 3.40 0.63 1329 5.20 3.28 0.63 1389

22 20 6.13 3.12 0.51 1268 5.88 3.00 0.51 1344 5.70 2.91 0.51 1374 5.50 2.81 0.51 1435

22 22 6.38 2.49 0.39 1314 6.15 2.40 0.39 1397 6.00 2.34 0.39 1435 5.75 2.24 0.39 1495

23 18 5.88 3.94 0.67 1208 5.63 3.77 0.67 1268 5.40 3.62 0.67 1329 5.20 3.48 0.67 1389

23 20 6.13 3.37 0.55 1268 5.88 3.23 0.55 1344 5.70 3.14 0.55 1374 5.50 3.03 0.55 1435

23 22 6.38 2.74 0.43 1314 6.15 2.64 0.43 1397 6.00 2.58 0.43 1435 5.75 2.47 0.43 1495

24 18 5.88 4.17 0.71 1208 5.63 3.99 0.71 1268 5.40 3.83 0.71 1329 5.20 3.69 0.71 1389

24 20 6.13 3.61 0.59 1268 5.88 3.47 0.59 1344 5.70 3.36 0.59 1374 5.50 3.25 0.59 1435

24 22 6.38 3.00 0.47 1314 6.15 2.89 0.47 1397 6.00 2.82 0.47 1435 5.75 2.70 0.47 1495

24 24 6.70 2.35 0.35 1374 6.45 2.26 0.35 1450 6.30 2.21 0.35 1495 6.10 2.14 0.35 1570

25 18 5.88 4.41 0.75 1208 5.63 4.22 0.75 1268 5.40 4.05 0.75 1329 5.20 3.90 0.75 1389

25 20 6.13 3.86 0.63 1268 5.88 3.70 0.63 1344 5.70 3.59 0.63 1374 5.50 3.47 0.63 1435

25 22 6.38 3.25 0.51 1314 6.15 3.14 0.51 1397 6.00 3.06 0.51 1435 5.75 2.93 0.51 1495

25 24 6.70 2.61 0.39 1374 6.45 2.52 0.39 1450 6.30 2.46 0.39 1495 6.10 2.38 0.39 1570

26 18 5.88 4.64 0.79 1208 5.63 4.44 0.79 1268 5.40 4.27 0.79 1329 5.20 4.11 0.79 1389

26 20 6.13 4.10 0.67 1268 5.88 3.94 0.67 1344 5.70 3.82 0.67 1374 5.50 3.69 0.67 1435

26 22 6.38 3.51 0.55 1314 6.15 3.38 0.55 1397 6.00 3.30 0.55 1435 5.75 3.16 0.55 1495

26 24 6.70 2.88 0.43 1374 6.45 2.77 0.43 1450 6.30 2.71 0.43 1495 6.10 2.62 0.43 1570

26 26 6.90 2.14 0.31 1450 6.70 2.08 0.31 1525 6.60 2.05 0.31 1570 6.40 1.98 0.31 1616

27 18 5.88 4.88 0.83 1208 5.63 4.67 0.83 1268 5.40 4.48 0.83 1329 5.20 4.32 0.83 1389

27 20 6.13 4.35 0.71 1268 5.88 4.17 0.71 1344 5.70 4.05 0.71 1374 5.50 3.91 0.71 1435

27 22 6.38 3.76 0.59 1314 6.15 3.63 0.59 1397 6.00 3.54 0.59 1435 5.75 3.39 0.59 1495

27 24 6.70 3.15 0.47 1374 6.45 3.03 0.47 1450 6.30 2.96 0.47 1495 6.10 2.87 0.47 1570

27 26 6.90 2.42 0.35 1450 6.70 2.35 0.35 1525 6.60 2.31 0.35 1570 6.40 2.24 0.35 1616

28 18 5.88 5.11 0.87 1208 5.63 4.89 0.87 1268 5.40 4.70 0.87 1329 5.20 4.52 0.87 1389

28 20 6.13 4.59 0.75 1268 5.88 4.41 0.75 1344 5.70 4.28 0.75 1374 5.50 4.13 0.75 1435

28 22 6.38 4.02 0.63 1314 6.15 3.87 0.63 1397 6.00 3.78 0.63 1435 5.75 3.62 0.63 1495

28 24 6.70 3.42 0.51 1374 6.45 3.29 0.51 1450 6.30 3.21 0.51 1495 6.10 3.11 0.51 1570

28 26 6.90 2.69 0.39 1450 6.70 2.61 0.39 1525 6.60 2.57 0.39 1570 6.40 2.50 0.39 1616

29 18 5.88 5.35 0.91 1208 5.63 5.12 0.91 1268 5.40 4.91 0.91 1329 5.20 4.73 0.91 1389

29 20 6.13 4.84 0.79 1268 5.88 4.64 0.79 1344 5.70 4.50 0.79 1374 5.50 4.35 0.79 1435

29 22 6.38 4.27 0.67 1314 6.15 4.12 0.67 1397 6.00 4.02 0.67 1435 5.75 3.85 0.67 1495

29 24 6.70 3.69 0.55 1374 6.45 3.55 0.55 1450 6.30 3.47 0.55 1495 6.10 3.36 0.55 1570

29 26 6.90 2.97 0.43 1450 6.70 2.88 0.43 1525 6.60 2.84 0.43 1570 6.40 2.75 0.43 1616

30 18 5.88 5.58 0.95 1208 5.63 5.34 0.95 1268 5.40 5.13 0.95 1329 5.20 4.94 0.95 1389

30 20 6.13 5.08 0.83 1268 5.88 4.88 0.83 1344 5.70 4.73 0.83 1374 5.50 4.57 0.83 1435

30 22 6.38 4.53 0.71 1314 6.15 4.37 0.71 1397 6.00 4.26 0.71 1435 5.75 4.08 0.71 1495

30 24 6.70 3.95 0.59 1374 6.45 3.81 0.59 1450 6.30 3.72 0.59 1495 6.10 3.60 0.59 1570

30 26 6.90 3.24 0.47 1450 6.70 3.15 0.47 1525 6.60 3.10 0.47 1570 6.40 3.01 0.47 1616

31 18 5.88 5.82 0.99 1208 5.63 5.57 0.99 1268 5.40 5.35 0.99 1329 5.20 5.15 0.99 1389

31 20 6.13 5.33 0.87 1268 5.88 5.11 0.87 1344 5.70 4.96 0.87 1374 5.50 4.79 0.87 1435

31 22 6.38 4.78 0.75 1314 6.15 4.61 0.75 1397 6.00 4.50 0.75 1435 5.75 4.31 0.75 1495

31 24 6.70 4.22 0.63 1374 6.45 4.06 0.63 1450 6.30 3.97 0.63 1495 6.10 3.84 0.63 1570

31 26 6.90 3.52 0.51 1450 6.70 3.42 0.51 1525 6.60 3.37 0.51 1570 6.40 3.26 0.51 1616

32 18 5.88 5.88 1.00 1208 5.63 5.63 1.00 1268 5.40 5.40 1.00 1329 5.20 5.20 1.00 1389

32 20 6.13 5.57 0.91 1268 5.88 5.35 0.91 1344 5.70 5.19 0.91 1374 5.50 5.01 0.91 1435

32 22 6.38 5.04 0.79 1314 6.15 4.86 0.79 1397 6.00 4.74 0.79 1435 5.75 4.54 0.79 1495

32 24 6.70 4.49 0.67 1374 6.45 4.32 0.67 1450 6.30 4.22 0.67 1495 6.10 4.09 0.67 1570

32 26 6.90 3.80 0.55 1450 6.70 3.69 0.55 1525 6.60 3.63 0.55 1570 6.40 3.52 0.55 1616

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

21 25 27 30

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

OUTDOOR DB (°C)

Page 22

PERFORMANCE DATA COOL operation at Rated frequency

MUZ-FD50VABH

CAPACITY : 5.0 kW SHF : 0.77 INPUT : 1510 W

INDOOR

DB (°C)

INDOOR

WB (°C)

21 18 4.90 2.89 0.59 1480 4.50 2.66 0.59 1570 4.15 2.45 0.59 1631

21 20 5.15 2.42 0.47 1540 4.80 2.26 0.47 1616 4.45 2.09 0.47 1706

22 18 4.90 3.09 0.63 1480 4.50 2.84 0.63 1570 4.15 2.61 0.63 1631

22 20 5.15 2.63 0.51 1540 4.80 2.45 0.51 1616 4.45 2.27 0.51 1706

22 22 5.45 2.13 0.39 1601 5.10 1.99 0.39 1691 4.75 1.85 0.39 1752

23 18 4.90 3.28 0.67 1480 4.50 3.02 0.67 1570 4.15 2.78 0.67 1631

23 20 5.15 2.83 0.55 1540 4.80 2.64 0.55 1616 4.45 2.45 0.55 1706

23 22 5.45 2.34 0.43 1601 5.10 2.19 0.43 1691 4.75 2.04 0.43 1752

24 18 4.90 3.48 0.71 1480 4.50 3.20 0.71 1570 4.15 2.95 0.71 1631

24 20 5.15 3.04 0.59 1540 4.80 2.83 0.59 1616 4.45 2.63 0.59 1706

24 22 5.45 2.56 0.47 1601 5.10 2.40 0.47 1691 4.75 2.23 0.47 1752

24 24 5.75 2.01 0.35 1661 5.40 1.89 0.35 1737 5.10 1.79 0.35 1812

25 18 4.90 3.68 0.75 1480 4.50 3.38 0.75 1570 4.15 3.11 0.75 1631

25 20 5.15 3.24 0.63 1540 4.80 3.02 0.63 1616 4.45 2.80 0.63 1706

25 22 5.45 2.78 0.51 1601 5.10 2.60 0.51 1691 4.75 2.42 0.51 1752

25 24 5.75 2.24 0.39 1661 5.40 2.11 0.39 1737 5.10 1.99 0.39 1812

26 18 4.90 3.87 0.79 1480 4.50 3.56 0.79 1570 4.15 3.28 0.79 1631

26 20 5.15 3.45 0.67 1540 4.80 3.22 0.67 1616 4.45 2.98 0.67 1706

26 22 5.45 3.00 0.55 1601 5.10 2.81 0.55 1691 4.75 2.61 0.55 1752

26 24 5.75 2.47 0.43 1661 5.40 2.32 0.43 1737 5.10 2.19 0.43 1812

26 26 6.05 1.88 0.31 1721 5.70 1.77 0.31 1797 5.35 1.66 0.31 1872

27 18 4.90 4.07 0.83 1480 4.50 3.74 0.83 1570 4.15 3.44 0.83 1631

27 20 5.15 3.66 0.71 1540 4.80 3.41 0.71 1616 4.45 3.16 0.71 1706

27 22 5.45 3.22 0.59 1601 5.10 3.01 0.59 1691 4.75 2.80 0.59 1752

27 24 5.75 2.70 0.47 1661 5.40 2.54 0.47 1737 5.10 2.40 0.47 1812

27 26 6.05 2.12 0.35 1721 5.70 2.00 0.35 1797 5.35 1.87 0.35 1872

28 18 4.90 4.26 0.87 1480 4.50 3.92 0.87 1570 4.15 3.61 0.87 1631

28 20 5.15 3.86 0.75 1540 4.80 3.60 0.75 1616 4.45 3.34 0.75 1706

28 22 5.45 3.43 0.63 1601 5.10 3.21 0.63 1691 4.75 2.99 0.63 1752

28 24 5.75 2.93 0.51 1661 5.40 2.75 0.51 1737 5.10 2.60 0.51 1812

28 26 6.05 2.36 0.39 1721 5.70 2.22 0.39 1797 5.35 2.09 0.39 1872

29 18 4.90 4.46 0.91 1480 4.50 4.10 0.91 1570 4.15 3.78 0.91 1631

29 20 5.15 4.07 0.79 1540 4.80 3.79 0.79 1616 4.45 3.52 0.79 1706

29 22 5.45 3.65 0.67 1601 5.10 3.42 0.67 1691 4.75 3.18 0.67 1752

29 24 5.75 3.16 0.55 1661 5.40 2.97 0.55 1737 5.10 2.81 0.55 1812

29 26 6.05 2.60 0.43 1721 5.70 2.45 0.43 1797 5.35 2.30 0.43 1872

30 18 4.90 4.66 0.95 1480 4.50 4.28 0.95 1570 4.15 3.94 0.95 1631

30 20 5.15 4.27 0.83 1540 4.80 3.98 0.83 1616 4.45 3.69 0.83 1706

30 22 5.45 3.87 0.71 1601 5.10 3.62 0.71 1691 4.75 3.37 0.71 1752

30 24 5.75 3.39 0.59 1661 5.40 3.19 0.59 1737 5.10 3.01 0.59 1812

30 26 6.05 2.84 0.47 1721 5.70 2.68 0.47 1797 5.35 2.51 0.47 1872

31 18 4.90 4.85 0.99 1480 4.50 4.46 0.99 1570 4.15 4.11 0.99 1631

31 20 5.15 4.48 0.87 1540 4.80 4.18 0.87 1616 4.45 3.87 0.87 1706

31 22 5.45 4.09 0.75 1601 5.10 3.83 0.75 1691 4.75 3.56 0.75 1752

31 24 5.75 3.62 0.63 1661 5.40 3.40 0.63 1737 5.10 3.21 0.63 1812

31 26 6.05 3.09 0.51 1721 5.70 2.91 0.51 1797 5.35 2.73 0.51 1872

32 18 4.90 4.90 1.00 1480 4.50 4.50 1.00 1570 4.15 4.15 1.00 1631

32 20 5.15 4.69 0.91 1540 4.80 4.37 0.91 1616 4.45 4.05 0.91 1706

32 22 5.45 4.31 0.79 1601 5.10 4.03 0.79 1691 4.75 3.75 0.79 1752

32 24 5.75 3.85 0.67 1661 5.40 3.62 0.67 1737 5.10 3.42 0.67 1812

32 26 6.05 3.33 0.55 1721 5.70 3.14 0.55 1797 5.35 2.94 0.55 1872

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

35 40 46

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

OUTDOOR DB (°C)

Page 23

PERFORMANCE DATA HEAT operation at Rated frequency

MUZ-FD25VABH

CAPACITY : 3.2 kW INPUT : 600 W

INDOOR

DB (°C)

15 2.02 390 2.43 468 2.85 528 3.26 570 3.68 606 4.06 624 4.48 636

21 1.92 420 2.30 498 2.72 552 3.10 594 3.52 624 3.90 642 4.30 666

26 1.73 450 2.14 528 2.53 582 2.94 624 3.36 654 3.74 672 4.16

-10 -5 0 5 10 15 20

Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT

OUTDOOR WB (°C)

MUZ-FD35VABH

CAPACITY : 4.0 kW INPUT : 840 W

INDOOR

DB (°C)

15 2.52 546 3.04 655 3.56 739 4.08 798 4.60 848 5.08 874 5.60 890

21 2.40 588 2.88 697 3.40 773 3.88 832 4.40 874 4.88 899 5.38 932

26 2.16 630 2.68 739 3.16 815 3.68 874 4.20 916 4.68 941 5.20

-10 -5 0 5 10 15 20

Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT

OUTDOOR WB (°C)

MUZ-FD50VABH

CAPACITY : 6.0 kW INPUT : 1610 W

INDOOR

DB (°C)

15 3.78 1047 4.56 1256 5.34 1417 6.12 1530 6.90 1626 7.62 1674 8.40 1707

21 3.60 1127 4.32 1336 5.10 1481 5.82 1594 6.60 1674 7.32 1723 8.07 1787

26 3.24 1208 4.02 1417 4.74 1562 5.52 1674 6.30 1755 7.02 1803 7.80

-10 -5 0 5 10 15 20

Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT

OUTDOOR WB (°C)

690

966

1852

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

Page 24

ACTUATOR CONTROL

MUZ-FD25VABH MUZ-FD35VABH MUZ-FD50VABH

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.

5 seconds 15 seconds

Compressor

OFF

Outdoor fan motor

OFF

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.

9-3. RELATION BETWEEN MAIN SENSOR AND ACTUATOR

MUZ-FD25/35

Discharge temperature thermistor

Indoor coil temperature thermistor

Defrost thermistor

Fin temperature thermistor Protection

Ambient temperature thermistor

Outdoor heat exchanger temperature thermistor

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

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

Compressor

R.V.coil

Outdoor fan motor

Sensor Purpose

ON OFF OFF

ON OFF

Protection

Cooling : Coil frost prevention

Heating : High pressure protection

Cooling : High pressure protection

Heating : Defrosting

Cooling : Low ambient temperature operation

Heating : Defrosting (Heater)

Low outside temperature operation

<COOL>

5 seconds

Compressor

LEV

      



<HEAT>

5 seconds

Actuator

Outdoor

fan motor

R.V.coil

Indoor fan

motor

Defrost

heater



Page 25

MUZ-FD50

Sensor Purpose

Discharge temperature thermistor

Indoor coil temperature thermistor

Defrost thermistor Heating : Defrosting

Fin temperature thermistor Protection

Ambient temperature thermistor

Outdoor heat exchanger temperature thermistor

Protection

Cooling : Coil frost prevention

Heating : High pressure protection

Cooling : Low ambient temperature operation

Heating : Defrosting (Heater)

Cooling : Low ambient temperature operation

Cooling : High pressure protection

Actuator

Compressor

LEV

Outdoor fan

motor

R.V.coil

Indoor fan

motor

 

 

 

Defrost

heater



SERVICE FUNCTIONS

MUZ-FD25VABH MUZ-FD35VABH MUZ-FD50VABH

10-1. CHANGE IN DEFROST SETTING

Changing defrost finish temperature MUZ-FD25/35

<JS> To change the defrost finish temperature, cut/solder the JS wire of the outdoor inverter P.C. board. (Refer to 11-6-1.)

Jumper wire Defrost ﬁ nish temperature (°C)

Soldered

MUZ-FD50

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 11-6-2.)

4th Dip Switch of SW1 Defrost ﬁ nish temperature (°C)

(Initial setting)

None

(Cut)

OFF

(Initial setting)

ON 12.2

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)

1234

8.3

MUZ-FD25/35

<JK> To activate the pre-heat control, cut the JK wire of the inverter P.C. board. (Refer to 11-6.1)

NOTE : When the inverter P.C. board is replaced, check the Jumper wires,

and cut/solder them if necessary.

MUZ-FD50 [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. (Refer to 11-6-2.)

1234

Page 26

TROUBLESHOOTING

MUZ-FD25VABH MUZ-FD35VABH MUZ-FD50VABH

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 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, 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) 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 11-2. and 11-3.

Housing point

Page 27

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 (11-3.) 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.

Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. 1

1. Regardless of normal or abnormal condition, a short

Does POWER lamp on the indoor unit blink at the interval of

0.5 seconds? Blinks: Either indoor or outdoor unit is abnormal. Beep

is emitted at the same timing as the blinking of POWER lamp.

Judgment of indoor/outdoor abnormality

Before blinking, does POWER 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. 2

Yes (Blinks)

No (OFF)

Yes

Indoor unit is normal. But the outdoor unit might be abnormal because there are some abnormalities 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 11-2.2)

The outdoor unit is abnormal. Check the blinking pattern, and conﬁ rm the abnormal point with the outdoor unit failure mode table. (Refer to 11-2.3) Make sure to check at least two consecutive blinking cycles. 3

beep is emitted once the signal is received.

Releasing the failure mode recall function

Deleting the memorized abnormal condition

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.

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.

2. Blinking pattern when the indoor unit is abnormal:

2.5-second OFF

Blinking at 0.5second interval

2.5-second OFF

Blinking at 0.5second interval

OFF

Repeated cycle Repeated cycle

Beeps

3.Blinking pattern when the outdoor unit is abnormal:

2.5-second OFF 3-second ON

Blinking at 0.5second interval

Beeps

Repeated cycle

2.5-second OFF 3-second ON

OFF

No beep Beeps

Repeated cycle

No beep Beeps

Repeated cycle

Beeps

Blinking at 0.5second interval

Repeated cycle

2727

Page 28

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 25°C.

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

Does POWER 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 POWER lamp. 2

Yes

)

(Blinks

No (OFF)

The outdoor unit is abnormal. Check the blinking pattern, and conﬁ rm the abnormal point with the out- door unit failure mode table (11-2.3.).

The outdoor unit is normal.

Make sure to check at least two consecutive blinking cycles. 2

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.

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

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" (11-2.1.).

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" men-

tioned 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.

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

2828

Blinking at 0.5-

second interval

Repeated cycle

Page 29

3. Outdoor unit failure mode table

MUZ-FD25/35

POWER lamp

(Indoor unit)

OFF None (Normal)

2-time ﬂ ash

2.5 seconds OFF

3-time ﬂ ash

2.5 seconds OFF

4-time ﬂ ash

2.5 seconds OFF

5-time ﬂ ash

2.5 seconds OFF

Abnormal point

(Failure mode / protection)

Outdoor power system

Discharge temperature thermistor

Defrost thermistor

Fin temperature thermistor 3-time ﬂ ash

P.C. board temperature thermistor

Ambient temperature thermistor

Overcurrent 11-time ﬂ ash

Compressor synchronous abnormality (Compressor start-up failure protection)

Discharge temperature

LED indication

(Outdoor P.C. board)

—— ———

Overcurrent protection stop is continuously performed 3 times within

—

1-time ﬂ ash every

2.5 seconds

2.5 seconds OFF

4-time ﬂ ash

2.5 seconds OFF

2-time ﬂ ash

2.5 seconds OFF

12-time ﬂ ash

2.5 seconds OFF

—

1 minute after the compressor gets started.

Thermistor shorts or opens during compressor running.

Large current ﬂ ows into intelligent power module.

Waveform of compressor current is distorted.

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

Condition Correspondence

Reconnect

• connectors. Refer to 11-5. "How

• to check inverter/ compressor". Check stop valve.

• Refer to 11-5.

• "Check of outdoor thermistors". Defective outdoor thermistors can be identiﬁ ed by checking the blinking pattern of LED.

Reconnect

• compressor connector. Refer to 11-5. "How

• to check inverter/ compressor". Check stop valve.

•

Reconnect

• compressor connector. Refer to 11-5. "How

• to check inverter/ compressor".

Check refrigerant

• circuit and refrigerant amount. Refer to 11-5. "Check

• of LEV".

Indoor/outdoor

unit failure

mode recall

function



—

Outdoor unit failure mode

recall function



6-time ﬂ ash

2.5 seconds OFF

7-time ﬂ ash

2.5 seconds OFF

8-time ﬂ ash

2.5 seconds OFF

9-time ﬂ ash

2.5 seconds OFF

10-time ﬂ ash

2.5 seconds OFF

11-time ﬂ ash

2.5 seconds OFF

12-time ﬂ ash

2.5 seconds OFF

14-time ﬂ ash

2.5 seconds OFF

High pressure

—

Fin temperature/ P.C. board temperature

Outdoor fan motor

Nonvolatile memory data 5-time ﬂ ash

Discharge temperature

DC voltage 8-time ﬂ ash

Each phase current of compressor

Overcurrent Compressor open-phase

Stop valve (Closed valve) 14-time ﬂ ash

7-time ﬂ ash

2.5 seconds OFF

—

2.5 seconds OFF

—

2.5 seconds OFF

9-time ﬂ ash

2.5 seconds OFF

10-time ﬂ ash

2.5 seconds OFF

Temperature indoor coil thermistor exceeds 70°C in HEAT mode. Temperature defrost thermistor exceeds 70°C in COOL mode.

Temperature of ﬁ n temperature thermistor on the inverter P.C. board exceeds 75 ~ 80°C, or temperature of P.C. board temperature thermistor on the inverter P.C. board exceeds 70 ~ 75°C.

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°C or less for 20 minutes.

DC voltage of inverter cannot be detected normally.

Each phase current of compressor cannot be detected normally.

Large current ﬂ ows 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.

Check refrigerant

• circuit and refrigerant amount. Check stop valve.

•

Check around outdoor

• unit. Check outdoor unit air

• passage. Refer to 11-5. "Check

• of outdoor fan motor".

Refer to 11-5. "Check

• of outdoor fan motor". Refer to 11-5. "Check of inverter P.C. board".

Replace the inverter

• P.C. board.

Refer to 11-5. "Check

• of LEV". Check refrigerant

•— circuit and refrigerant amount.

Refer to 11-5. "How

• to check inverter/ compressor".

Reconnect

• compressor connector. Refer to 11-5. "How

• to check inverter/ compressor".

Check stop valve •

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

—







—





2929

Page 30

MUZ-FD50

LED indication

POWER lamp

(Indoor unit)

OFF None (Normal) — — — — —

2-time ﬂ ash Outdoor power system Lighting Lighting Overcurrent protection stop is continuously

3-time ﬂ ash Discharge temperature

Abnormal point

(Failure mode / protection)

thermistor Defrost thermistor Lighting Once

(Outdoor P.C. board)

LED1 LED2

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

Lighting Once Thermistor shorts or opens during compressor

running.

Condition Correspondence

• Check the connection of the

compressor connecting wire.

• Refer to 11-5. "How to

check inverter/compressor".

• Check the stop valve.

• Refer to 11-5. "Check of

outdoor thermistors".

Indoor/outdoor

unit failure

mode recall

function



Ambient temperature thermistor

Fin temperature thermistor Lighting 3 times

P.C. board temperature thermistor

Outdoor heat exchanger temperature thermistor

4-time ﬂ ash Overcurrent Once Goes out 28 A current ﬂ ows into intelligent power module. • Reconnect compressor

5-time ﬂ ash Discharge temperature Lighting Lighting Discharge temperature exceeds 116°C during

6-time ﬂ ash High pressure Lighting Lighting The outdoor heat exchanger temperature

7-time ﬂ ash Fin temperature 3 times Goes out The ﬁ n temperature exceeds 87°C during

P.C. board temperature 4 times Goes out The P.C. board temperature exceeds 70°C

8-time ﬂ ash Outdoor fan motor Lighting Lighting Failure occurs continuously three times within

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

10-time ﬂ ash Discharge temperature Lighting Lighting The frequency of the compressor is kept 80 Hz

11-timeﬂ ash Communication error between

P.C. boards

Current sensor Lighting 7 times A short or open circuit is detected in the current

Zero cross detecting circuit 5 times Goes out Zero cross signal cannot be detected while the

Converter 5 times Goes out A failure is detected in the operation of the

Bus-bar voltage (1)

Bus-bar voltage (2)

Even if this protection stop

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

Lighting Twice

Lighting 4 times • Replace the outdoor

Lighting 9 times • Refer to 11-5. "Check of

operation. Compressor can restart if discharge temperature thermistor reads 100°C or less 3 minutes later.

exceeds 70°C during cooling or the indoor gas pipe temperature exceeds 70°C during heating.

operation.

during operation.

30 seconds after the fan gets started.

properly.

or more and the discharge temperature is kept under 39°C for more than 20 minutes.

Lighting 6 times Communication error occurs between the

5 times Goes out The bus-bar voltage exceeds 400 V or falls to

6 times Goes out The bus-bar voltage exceeds 400 V or falls to 50

electronic control P.C. board and power board for more than 10 seconds.

The communication between boards protection stop is continuously performed twice.

sensor during compressor operating.

Current sensor protection stop is continuously performed twice.

compressor is operating.

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

converter during operation.

200 V or below during compressor operating.

V or below during compressor operating.

electronic control P.C. board.

outdoor thermistors".

connector.

• Refer to 11-5.

check inverter/compressor.

• Check the stop valve.

• Check refrigerant circuit and

refrigerant amount.

• Refer to 11-5. "Check of

LEV".

• Check refrigerant circuit and

refrigerant amount.

• Check the stop valve.

• Check around outdoor unit.

• Check outdoor unit air

passage.

• Refer to 11-5.

outdoor fan motor".

• Refer to 11-5. "Check of

outdoor fan motor".

• Replace the outdoor

electronic control P.C. board.

• Check refrigerant circuit and

refrigerant amount.

• Refer to 11-5.

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.

•

Replace the power board.

"How to

"Check of

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



—



—



—



—



—

Page 31

11-3. TROUBLESHOOTING CHECK TABLE

MUZ-FD25/35

No. Symptom LED indication

Outdoor unit does not op-

erate.

'Outdoor unit stops and

restarts 3 minutes later' is repeated.

Outdoor unit

operates.

Outdoor unit operates.

1-time ﬂ ash every

2.5 seconds

6-time ﬂ ash

2.5 seconds OFF 11-time ﬂ ash

2.5 seconds OFF 14-time ﬂ ash

2.5 seconds OFF

2-time ﬂ ash

2.5 seconds OFF

3-time ﬂ ash

2.5 seconds OFF

4-time ﬂ ash

2.5 seconds OFF

5-time ﬂ ash

2.5 seconds OFF

8-time ﬂ ash

2.5 seconds OFF

10-time ﬂ ash

2.5 seconds OFF

12-time ﬂ ash

2.5 seconds OFF 13-time ﬂ ash

2.5 seconds OFF 1-time ﬂ ash

2.5 seconds OFF 3-time ﬂ ash

2.5 seconds OFF

4-time ﬂ ash

2.5 seconds OFF

7-time ﬂ ash

2.5 seconds OFF

Abnormal point/

Condition

Outdoor power system

Outdoor thermistors Discharge temperature thermistor, ﬁ n temperature thermistor,

Outdoor control system

Serial signal The communication fails between the indoor and outdoor unit

Stop valve/ Closed valve

Outdoor unit (Other abnormality)

Overcurrent protection

Discharge temperature overheat protection

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

High pressure protection

Compressor synchronous abnormality

Outdoor fan motor Outdoor fan has stopped 3 times in a row within 30 seconds

Each phase current of compressor

DC voltage DC voltage of inverter cannot be detected normally. Refer to 11-5. "How to check in-

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

Condition Correspondence

Overcurrent protection stop is continuously performed 3 times within 1 minute after the compressor gets started.

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

Nonvolatile memory data cannot be read properly.

(POWER lamp of the indoor unit lights up or ﬂ ashes 7-time.)

for 3 minutes. Closed valve is detected by compressor current. Check stop valve. •

Outdoor unit is defective. Refer to 11-2.2. "Flow chart of the

Large current ﬂ ows into intelligent power module. Reconnect connector of compres-

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

Temperature of ﬁ n temperature thermistor on the heat sink exceeds 75 ~ 80°C or temperature of P.C. board temperature thermistor on the inverter P.C.board exceeds 70 ~ 75°C.

Indoor coil thermistor exceeds 70°C in HEAT mode. Defrost thermistor exceeds 70°C in COOL mode.

The waveform of compressor current is distorted. Reconnect connector of compres-

after outdoor fan start-up.

Each phase current of compressor cannot be detected normally.

Current from power outlet is nearing breaker capacity. The unit is normal, but check the

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

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

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

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

Reconnect connector of compres-

• sor. Refer to 11-5. "How to check in-

• verter/compressor". Check stop valve.

•

Refer to 11-5. thermistors".

Replace inverter P.C. board. •

Refer to 11-5. "How to check mis-

• wiring and serial signal error.

• detailed outdoor unit failure mode recall function".

• sor. Refer to 11-5. "How to check in-

• verter/compressor". Check stop valve.

• Check refrigerant circuit and refrig-

• erant amount.

•

Refer to 11-5. "Check of LEV".

Check around outdoor unit.

• Check outdoor unit air passage.

• Refer to 11-5. "Check of outdoor

• fan motor".

Check refrigerant circuit and refrig-

• erant amount. Check stop valve.

•

• sor. Refer to 11-5. "How to check in-

• verter/compressor".

Refer to 11-5. "Check of outdoor

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

• P.C. board.

Refer to 11-5. "How to check in-

• verter/compressor".

following. Check if indoor ﬁ lters are clogged.

• Check if refrigerant is short.

• Check if indoor/outdoor unit air cir-

• culation is short cycled.

Check refrigerant circuit and refrig-

• erant amount. Refer to 11-5.

• Refer to 11-5. "Check of outdoor

• thermistors".

Refer to 11-5. "Check of LEV".

• Check refrigerant circuit and refrig-

• erant amount.

"Check of outdoor

"Check of LEV".

8-time ﬂ ash

2.5 seconds OFF

9-time ﬂ ash

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

2. LED is lighted during normal operation.

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

2.5-second OFF

OFF

2.5 seconds OFF

PAM protection PAM: Pulse Amplitude Modulation

Inverter check mode The connector of compressor is disconnected, inverter check

0.5-second ON

2.5-second OFF

The overcurrent ﬂ ows into IGBT (Insulated Gate Bipolar tran- sistor : TR821) or the bus-bar voltage reaches 320 V or more, PAM stops and restarts.

mode starts.

0.5-second ON

This is not malfunction. PAM protection will be activated in the following cases;

1 Instantaneous power voltage

drop. (Short time power failure)

2 When the power supply voltage

is high.

Check if the connector of the com-

• pressor is correctly connected. Refer to 11-5. "How to check inverter/compressor".

Inverter P.C. board (Parts side)

LED

Flashing 

Page 32

MUZ-FD50

No. Symptom

Outdoor unit does not operate.

LED indication

LED1(Red)

Lightning

Abnormal point/ Con-

LED2(Yellow)

Twice

3 times

4 times

5 times

6 times

7 times

8 times

11 times

dition

Outdoor power system

Discharge temperature thermistor

Fin temperature thermistor

P.C. board temperature thermistor

Ambient temperature thermistor

Outdoor heat exchanger temperature thermistor

Defrost thermistor A short circuit is detected in the thermistor during operation, or

Serial signal The communication fails between the indoor and outdoor unit 3

Nonvolatile memory data

Current sensor Current sensor protection stop is continuously performed twice. • Replace the power board.

Communication error between P.C. boards

Overcurrent protection stop is continuously performed 3 times within 1 minute after the compressor gets started, or when converter protection stop or bus-bar voltage protection stop is continuously performed three times within 3 minutes after startup.

A short circuit is detected in the thermistor during operation, or when 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) of compressor start-up.

an open circuit is detected in the thermistor after 5 minutes of compressor stat-up.

minutes. The nonvolatile memory data cannot be read properly. • Replace the outdoor electronic

The communication protection stop between boards is continuously performed twice.

Condition Correspondence

• Check the connection of the compressor connecting wire.

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

• Check the stop valve.

• Refer to 11-5. "Check of outdoor thermistor".

• Refer to 11-5. thermistor".

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

• Refer to 11-5. "Check of outdoor thermistor".

• Refer to 11-5. miswiring and serial signal error.

control P.C. board.

• Check the connecting wire between outdoor electronic control P.C. board and power board.

"Check of outdoor

"How to check

Zero cross detecting

’Outdoor unit stops and restarts 3 minutes later’ is

repeated.

11 3 times

12 4 times

13 5 times

14 8 times

15 9 times

16 13 times

17 Lighting 8 times

18 Lighting 11 times

19 Lighting 12 times

NOTE: 1. The location of LED is illustrated at the right ﬁ gure. Refer to 11-6.2.

2. LED is lighted during normal operation.

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

Lightning

Twice

circuit

12 times

lPM protection Overcurrent is detected after 30 minutes of compressor start-

Goes

out

Lock protection Overcurrent is detected within 30 minutes of compressor start-

Discharge tempera-

Goes

ture protection

out

Fin temperature protection

Goes

out

P.C. board temperature protection

High-Pressure pro-

Goes

tection

out

Converter protection A failure is detected in the operation of the converter during

Goes

out

Bus-bar voltage protection (1).

Goes

out

Bus-bar voltage protection (2)

Outdoor fan motor Failure occurs continuously three times within 30 seconds after

Goes

out

Current sensor protection

Communication between P.C. boards protection

Zero cross detecting circuit protection

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

up.

Discharge temperature exceeds 116°C during operation and compressor stops. Compressor can restart if discharge temperature thermistor reads 100°C or less 3 minutes later.

The ﬁ n temperature exceeds 87°C during operation. • Check around outdoor unit.

The P.C. board temperature exceeds 70°C during operation.

The outdoor heat exchanger temperature exceeds 70°C during cooling or indoor gas pipe temperature exceeds 70°C during heating.

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.

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.

• Check the connecting wire among outdoor electronic control P.C. board, noise ﬁ lter P.C. board and power board.

• Reconnect compressor connector.

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

• Check the stop valve.

• Check the power module (PAM module).

• Check the amount of gas and refrigerant circuit.

• Refer to 11-5. "Check of LEV".

• Check outdoor unit air passage.

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

• Check the amount of gas and the refrigerant circuit.

• Check the stop valve.

• Replace the power board.

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

• Replace the power board.

• Check the connecting wire between outdoor electronic control P.C. board and power board.

• Check the connecting wire among outdoor electronic control P.C. board, noise ﬁ lter P.C. board and power board.

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

LED2 LED1

Lighting



OFF

2.5-second OFF

0.5-second ON

2.5-second OFF

0.5-second ON

Page 33

No. Symptom

Outdoor unit operates.

LED indication

LED1(Red)

Once

Twice

3 times

4 times

Abnormal point/ Con-

LED2(Yellow)

Primary current protection

Lighting

Secondary current protection

High-Pressure protection

Lighting

Defrosting in cooling

Discharge temperature protection

Lighting

Low discharge temperature protection

Lighting

dition

Condition Correspondence

The input current exceeds 15 A. These symptoms do not mean any

The current of the compressor exceeds 15 A.

The indoor gas pipe temperature exceeds 45°C during heating.

The indoor gas pipe temperature falls 3°C or below during cooling.

The discharge temperature exceeds 100°C during operation. • Check refrigerant circuit and refrig-

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

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 aircirculation is short cycled.

erant amount.

• Refer to 11-5. "Check of LEV".

• Refer to 11-5. "Check of outdoor thermistors’’.

• Refer to 11-5. "Check of LEV".

• Check refrigerant circuit and refrigerant amount.

Outdoor unit operates

5 times

9 times

Lighting

Cooling high-pressure protection

Lighting

Inverter check mode The unit is operated with emergency operation switch.

Lighting

Normal

Lighting

The outdoor heat exchanger temperature exceeds 58°C during operation.

——

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.

—

Page 34

11-4. TROUBLE CRITERION OF MAIN PARTS

MUZ-FD25VABH MUZ-FD35VABH

Part name Check method and criterion Figure

Defrost thermistor (RT61)

Ambient temperature thermistor (RT65)

Outdoor heat exchanger temperature thermistor (RT68)

Discharge temperature thermistor (RT62)

Fin temperature thermistor (RT64)

Compressor

Outdoor fan motor

R. V. coil (21S4)

Measure the resistance with a tester.

Refer to 11-6. “Test point diagram and voltage”, 1. “Inverter 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 11-6. “Test point diagram and voltage”, 1. “Inverter P.C. board”, the chart of thermistor.

Measure the resistance between terminals using a tester. (Winding temperature : -20 ~ 40°C)

Normal

U-V

U-W

0.78 ~ 1.11 

V-W

Measure the resistance between lead wires using a tester. (Part temperature : -20 ~ 40°C)

Color of lead wire Normal

RED – BLK

BLK – WHT

11 ~ 16 

WHT – RED

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

Normal

1.19 ~ 1.78 k

WHT

RED BLK

Expansion valve coil (LEV)

Defrost heater

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

Color of lead wire Normal

WHT – RED RED – ORN

YLW – BRN

37 ~ 54 

BRN – BLU

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

Normal

349 ~ 428 

WHT RED ORN

YLW

LEV

BRN

BLU

Page 35

MUZ-FD50VABH

Part name Check method and criterion Figure

Defrost thermistor (RT61)

Fin temperature thermistor (RT64)

Measure the resistance with a tester.

Ambient temperature thermistor (RT65)

Outdoor heat exchanger temperature thermistor

(RT68)

Discharge temperature thermistor

(RT62)

Compressor

Outdoor fan motor

R. V. coil

Refer to 11-6. "Test point diagram and voltage", 2. "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 11-6. "Test point diagram and voltage", 2. "Outdoor electronic

control P.C. board", the chart of thermistor.

Measure the resistance between terminals using a tester. (Winding temperature : -20 ~ 40°C)

Normal

0.57 ~ 0.82 

Measure the resistance between lead wires using a tester. (Part temperature : -20 ~ 40°C)

Color of lead wire Normal

RED – BLK

12 ~ 17 BLK – WHT

WHT – RED

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

Normal

1.15 ~ 1.71 k

WHT

RED

BLK

RED

(W)

WHT

(V)

BLK

(U)

Linear expansion valve

High pressure switch (HPS)

Defrost heater

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

Color of lead wire Normal

WHT – RED RED – ORN

YLW – BRN

37 ~ 54 

BRN – BLU

Pressure

3.7 ± 0.15 MPa Close

+0.05

MPa Open

4.8

-0.1

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

Normal

349 ~ 428 

WHT

RED ORN

YLW

LEV

BRN

BLU

Page 36

11-5. TROUBLESHOOTING FLOW

A How to check inverter/compressor

MUZ-FD25/35

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.

See 11-5. “Check of open phase”.

Replace the inverter P.C. board.

See 11-5. “Check of compressor”.

3636

Page 37

MUZ-FD50

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)

After the outdoor fan starts running, wait for 1 minute or more before meas-

• uring the voltage. Output voltage is 50 - 130 V. (The voltage may differ according to the tester.)

•

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? (Refer to 11-4.)

Yes

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

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

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

Yes

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

Replace the power board.

Replace the compressor.

Refer to <<Judgement>>.

Yes

Check the refrigerant circuit. Check the stop valve.

Refer to <<Judgement>>. Replace the compressor.

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

<<Judgement>>

0 second

1 second

2 seconds

10 seconds

10 minutes

Heating part

Compressor starts

Abnormal (IPM failure) (Compressor winding short)

Abnormal (Compressor lock out) (Starting defect)

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

Abnormal (Refrigerant circuit defect) (Closed valve)

Normal

Page 38

B Check of open phase

MUZ-FD25/35

 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 is 50 - 130 V. (The voltage may differ according to the tester.)

<< Operation method>> Start cooling or heating operation by pressing EMERGENCY OPERATION switch on the indoor unit. (TEST RUN OPERA-

TION : 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 the inverter P.C. board ﬂ ashes 9 times. (Refer to 11-6.1.)

Measure AC voltage between the lead wires at 3 points.

C Check of compressor

MUZ-FD25/35

Refer to 11-5. “Check of compressor winding”. Is the compressor normal?

Yes

Refer to 11-5. “Check of compressor operation time”. Does the compressor operate continuously?

Yes

OK.

Replace the compressor.

Refer to 11-5. “Check of compressor start failure”.

Page 39

D Check of compressor winding

MUZ-FD25/35

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

Measure the resistance between the lead wires at 3 points. WHT-RED <<Judgement>> Refer to 11-4. 0 [] ················Abnormal [short] Infinite [] ·······Abnormal [open]

NOTE: Be sure to zero the ohmmeter before measurement.

E Check of compressor operation time

MUZ-FD25/35

 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 overcurrent.

F Check of compressor start failure

MUZ-FD25/35

Conﬁ rm that ~

•Electrical circuit check . Contact of the compressor connector (Including CN61) . Output voltage of inverter P.C. board and balance of them (See 11-5. ) . Direct current voltage between DB61(+) and (-) on the inverter P.C. board . Voltage between outdoor terminal block S1-S2

is normal.

<<Judgement>>

0 second

1 second

2 seconds

10 seconds

10 minutes

Compressor starts

Abnormal (IPM failure) (Compressor winding short)

Abnormal (Compressor lock out) (Starting defect)

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

Abnormal (Refrigerant circuit defect) (Closed valve)

Normal

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

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

Yes

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

Yes

Check the refrigerant circuit. Check the stop valve.

Replace the compressor.

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

Heating part

Page 40

G 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 resistance of thermistor normal? (Refer to 11-6.1. or 11-6.2.)

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.)

Replace the thermistor except RT64. When RT64 is abnormal, replace the inverter P.C. board or the outdoor power board.

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

MUZ-FD25/35

Thermistor Symbol Connector, Pin No. Board Defrost RT61 Between CN641 pin1 and pin2 Discharge temperature RT62 Between CN641 pin3 and pin4 Fin temperature RT64 Between CN642 pin1 and pin2 Ambient temperature RT65 Between CN643 pin1 and pin2 Outdoor heat exchanger temperature RT68 Between CN644 pin1 and pin3

Inverter P.C. board

MUZ-FD50

Thermistor Symbol Connector, Pin No. Board Defrost RT61 Between CN661 pin 1 and pin 2 Discharge temperature RT62 Between CN661 pin 3 and pin 4 Outdoor heat exchanger temperature RT68 Between CN661 pin 7 and pin 8 Ambient temperature RT65 Between CN663 pin 1 and pin 2 Fin temperature RT64 Between CN3 pin 1 and pin 2 Outdoor power board

Outdoor electronic control P.C. board

H Check of R.V. coil

MUZ-FD25/35

First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 11-4. 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.

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

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

Is there 230 VAC between CN721

on the inverter P.C. board 3 minutes

after the power supply is turned ON?

Replace the 4-way valve.

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

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 230 VAC between CN721 and

on the inverter P.C. board 3 minutes

after the power supply is turned ON?

Yes

and

Replace the inverter

P.C. board.

Replace the inverter

Yes

P.C. board.

Replace the 4-way valve.

Page 41

MUZ-FD50

Heating operation does not work.•

Disconnect the lead wire leading to the compressor.

3 minutes after turning on the power supply, start EMERGENCY OPERATION in HEAT mode.

Is there voltage of 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 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-

2. 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 outdoor 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.

Page 42

I Check of outdoor fan motor

MUZ-FD25/35

Disconnect CN932 from the inverter P.C. board, and measure the resistance of the outdoor fan motor.

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

Yes

Replace the inverter P.C. board.

MUZ-FD50

Disconnect CN932 from the outdoor electronic control P.C. board, and measure the resistance of the outdoor fan motor.

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

(Fixed to either 5 or 0 VDC)

Replace the outdoor fan motor.

Yes

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(-)

Replace the outdoor fan motor.

Does the voltage between each terminal become 5 and 0 VDC repeatedly?

Yes

Does the outdoor fan motor rotate smoothly?

Yes

Replace the outdoor electronic control P.C. board.

Page 43

J Check of power supply

MUZ-FD25/35

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

Does POWER lamp on the indoor unit light up?

Yes

Rectify indoor/outdoor connecting wire.

Yes

Is there voltage 230 VAC between the indoor terminal block S1 and S2?

Replace the indoor electronic control P.C.

board.

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

Check the electric parts in main circuit.

MUZ-FD50

Check the connecting of parts of main power supply circuit.

Turn ON power supply.

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

Yes

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

Yes

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

Yes

If light up, OK. If ﬂ ash, refer to 11-3.

Check the power supply cable.

Is fuse (F64) blown?

Yes

Replace the inverter

P.C. board.

DB61

Inverter P.C. board (Solder side)

Replace the noise ﬁ lter P.C. board.

280 ~ 370 VDC

Is the input voltage to the power board 230 VAC?

Yes

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

Yes

Replace the outdoor electronic control P.C. board.

Replace the fuse.

Replace the reactor.

Replace the power board.

Page 44

K Check of LEV (Expansion valve)

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 ex-

cept 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.

Expansion valve operates in full-opening direction.

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

Yes

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

Is LEV coil properly ﬁ xed to the expansion valve?

Yes

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

Replace the LEV coil.

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.

Yes

Properly ﬁ x the LEV coil to the expansion valve.

Measure each voltage between connector pins of CN724 on the inverter P.C. board or CN795 on the outdoor electronic control P.C. board.

1. Pin (-) — Pin (+)

2. Pin (-) — Pin (+)

3. Pin (-) — Pin (+)

4. Pin (-) — Pin (+) Is there about 3 ~ 5 VAC between each?

NOTE : Measure the voltage by an analog

tester.

Replace the expansion valve.

Yes

Replace the inverter P.C. board or the outdoor

electronic control P.C. board.

Page 45

L Check of inverter P.C. board

MUZ-FD25/35

Check the outdoor fan motor. (Refer to 11-5. .)

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

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

Operate the outdoor unit by starting EMERGENCY OPERATION.

Check the LED indication on the inverter P.C. board. Does the LED ﬂ ash 10 times?

Yes (10-time ﬂ ash)

Replace the inverter P.C. board.

Yes

Inverter P.C. board (Solder side)

CN932

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

Page 46

M How to check miswiring and serial signal error

Turn OFF the power supply.

Is there rated voltage in the power supply?

Turn ON the power supply.

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

Press EMERGENCY OPERATION switch once.

Does AREA-L 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. 1

Turn ON the power supply.

Yes

Check the power supply.

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

Be sure to conﬁ rm the wiring is correct before the operation

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.

Check the wiring.

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

Yes

Correct them.

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 ﬁ lter on remote control receiving section of the indoor unit.

Is serial signal error indicated 6 minutes later?

Yes

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

No (Lighted or not lighted)

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

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

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

Yes

wire.

Replace the indoor/ outdoor connecting

Yes

wire.

Page 47

N Electromagnetic noise enters into TV sets or radios

Is the unit earthed?

Yes

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

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

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

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.

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 following 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, earth 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.

Page 48

O Check of defrost heater

Check the following points before checking electric continuity.

1. Does the resistance of ambient temperature thermistor have the characteristics? Refer to 11-6.1. or 2.

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?

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

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

water etc...

Is there 230 VAC between CN722 and on the inverter P.C. board or the relay P.C. board? Refer to 11-6.1. or 2.

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

Yes

No problem of the inverter P.C. board or the relay P.C. board.

Page 49

11-6. TEST POINT DIAGRAM AND VOLTAGE

1. Inverter P.C. board

MUZ-FD25VABH MUZ-FD35VABH

Back side of unit

AC 230 V

Fuse (F901) 250 V 3.15 A

Output to drive compressor (LDU, LDV, LDW)

DB61 DC 260 - 300 V

(-)

(+)

Smoothing capacitor (C63)

Smoothing capacitor (C62)

Fuse (F801) 250 V 3.15 A

Smoothing capacitor (C61)

Fuse (F701) 250 V 3.15 A

Heater connector (CN722)

R.V.coil (CN721) 230 VAC

AC 230 V

Front side of unit

Fin temperature

thermistor /RT64

Output to drive outdoor

fan motor (CN932)

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

100

Resistance(kΩ)

-20 -10 0 10 20 30 40 Temperature(°C)

(CN642)

Ambient temperature

Outdoor heat exchanger

temperature thermistor

/RT68 (CN644)

Discharge temperature thermistor(RT62)

700

600

500

400

300

200

Resistance(kΩ)

100

0 102030405060708090100110120

Defrost thermistor

/RT61(CN641)

thermistor /RT65

(CN643)

Temperature(°C)

Discharge temperature

thermistor /RT62

LEV connector (CN724)

(CN641)

Jumper wire for changing defrost setting (JS)

Fin temperature thermistor(RT64)

200

180

160

140

120

100

Resistance(kΩ)

0 1020304050607080

Temperature(°C)

Jumper wire for pre-heat control setting (JK)

Page 50

2. Outdoor electronic control P.C. board

MUZ-FD50VABH

Discharge temperature thermistor (RT62)

700 600 500 400 300 200

Resistance (k )

100

0 102030405060708090100110120

Temperature (°C)

CN661

Fin temperature thermistor (RT64)

200 180 160 140 120 100

Resistance (k )

60 40 20

0 1020304050607080

Temperature (°C)

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

100

90 80 70 60 50

Resistance (k )

40 30 20 10

-20-100 10203040

Temperature (°C)

LED 1

LED 2

SW1

CN932

20-90V AC

To fan

motor

5V DC

CN931

pulse wave

GND

Discharge temperature

thermistor (RT62)

Defrost thermistor (RT61)

Ambient temperature

Outdoor heat exchanger

temperature thermistor (RT68)

CN663

CN701

Signal transmission

(To power board)

5V DC pulse wave

(–)

(+)

thermistor (RT65)

(From power board)

5V DC pulse wave

CN702

Signal reception

(+)

(–)

15V

GND

12V

CN781

(+)

Rush current relay

15V

GND (power board)

(–)R.V. coil

(–)

(+)

LEV

CN795

12V DC

pulse wave

(–)

CN801

325 - 370

VDC Input

F801

FUSE

250 V 3.15 A

CN681 High pressure switch

CN601

230 VAC Input

(+)

CN792

(–)

To relay P.C. board Defrost heater

Serial signal 5 - 10 VDC

CN601

Page 51

3. Noise filter P.C. board

MUZ-FD50VABH

CN901 To electronic control P.C. board

CN912 R.V. coil 230 VAC Output

230 VAC Output

CN902 To power board

CN903 To power board

230 VAC Input

CN61 230 VAC Output

4. Outdoor power board

MUZ-FD50VABH

325-370 VDC Output

(+)

(–)

(Red)

(White)

F64 FUSE 2 A / 250 V

NR64 VARISTOR

Connect to the compressor Voltage among phases: 5 to 180 V

Connect to the earth

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)

Page 52

5. Relay P.C. board

MUZ-FD50VABH

CN721 To electronic control P.C. board 12 VDC

CN722 Connect to the heater 230 VAC output

CN71 230 VAC input

Page 53

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.

12-1. MUZ-FD25VABH MUZ-FD35VABH

OPERATING PROCEDURE PHOTOS

1. Removing the cabinet

(1) Remove the screw fixing the service panel. (2) Pull down the service panel and remove it. (3) Disconnect the power supply and indoor/outdoor con-

necting wire. (4) Remove the screws fixing the top panel. (5) Remove the top panel. (6) Remove the screws fixing the cabinet. (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.

Hold the sleeve, and pull out the terminal slowly.

Connector

NOTE : Turn OFF power supply before disassembling.

Photo 1

Screws of the top panel

Screw of the cabinet

Screws of the top panel

Photo 2

Screws of the cabinet

Back

panel

Service

panel

Screw of the

service panel

Direction to remove

Screws of the cabinet

Hooks

Page 54

OPERATING PROCEDURE

PHOTOS

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

(1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the lead wire to the reactor and the following con-

nectors; <Inverter P.C. board> CN721 (R.V. coil) CN722 (Defrost heater) CN932 (Fan motor) CN641 (Defrost thermistor and discharge temperature ther-

mistor) CN643 (Ambient temperature thermistor) CN644 (Outdoor heat exchanger temperature thermistor) CN724 (LEV)

(3) Remove the compressor connector (CN61). (4) Remove the screws fixing the relay panel. (Photo 3) (5) Remove the inverter assembly. (Photo 4) (6) Remove the screw of the earth wire and screw of the

T.B.support. (Photo 4)

(7) Remove the relay panel from the inverter assembly. (8) Remove the inverter P.C. board from the relay panel.

3. Removing R.V. coil

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

Photo 3

Screws of the relay panel

Photo 4 (Inverter assembly)

Heat sink

Inverter P.C. board

Screw of the T.B.support

T.B.support

4. Removing the discharge temperature thermistor, defrost thermistor and outdoor heat exchanger temperature thermistor.

(1) Remove the cabinet and panels. (Refer to 1.)

(2) Pull out the discharge temperature thermistor from its holder.

(Photo 5) (3) Pull out the defrost thermistor from its holder. (Photo 6) (4) Pull out the outdoor heat exchanger temperature thermistor

from its holder. (Photo 6)

Relay panel

Photo 5

Screw of the earth wire

R.V. coil

Discharge temperature thermistor

Page 55

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. (Photo 7) (4) Remove the propeller. (Photo 7) (5) Remove the screws fixing the fan motor. (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 MPa (0 kg/cm2).

(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.

(Photo 8)

Photo 6

Photo 7

Outdoor heat exchanger temperature thermistor

Defrost thermistor

Screws of the outdoor fan motor

Propeller

Photo 8

Propeller nut

Welded parts of 4-way valve

Page 56

12-2. MUZ-FD50VABH

NOTE : Turn OFF power supply before disassembling.

OPERATING PROCEDURE

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) Disconnect the power supply and indoor/outdoor connect-

ing wire. (8) Remove the screws of the cabinet. (9) Remove the cabinet. (10)

Remove the screws of the back panel.

(11)

Remove the back panel.

PHOTOS

Photo 1

Screw of the top panel

Screws of the back panel

Screws of the cabinet

Photo 2

Screw of the top panel

Screws of the cabinet

Screw of the service panel

Screw of the valve cover

Screws of the back panel

Page 57

OPERATING PROCEDURE PHOTOS

2. Removing the inverter assembly, outdoor electric control P.C. board, power board, noise filter P.C. board and reactor.

(1) Remove the top panel, cabinet and service panel. (Refer to

1.) (2) Remove the back panel. (Refer to 1.) (3) Disconnect the following connectors;

<Electronic control P.C. board> CN931 and CN932 (Fan motor) CN795 (LEV) CN661 (Discharge temperature thermistor, defrost thermis-

tor and outdoor heat exchanger temperature ther-

mistor) CN663 (Ambient temperature thermistor) <Noise filter P.C. board> CN912 (R.V. coil)

(4) Remove the compressor connector. (5) Remove the screws fixing the relay panel. (6) Remove the inverter assembly. (7) Disconnect all connectors and lead wires on the electronic

control P.C. board.

(8) Remove the outdoor electronic control P.C. board from the

inverter assembly.

(9) Disconnect the reactor lead wire. (

) Remove the screws of the reactor, and remove the reactor.

(11)

Remove the screws fixing the power board assembly.

(12)

Disconnect all connectors and lead wires on the power

board.

(13)

Remove the power board from the inverter assembly.

(14)

Disconnect all connectors and lead wires on the noise filter

P.C. board.

(15)

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

bly.

Photo 3 (Inverter assembly)

Screws of the power board assembly

Screws of the relay panel

Photo 4

Screws of the reactor

Page 58

OPERATING PROCEDURE PHOTOS

3. Removing the defrost thermistor, discharge temperature thermistor, outdoor heat exchanger temperature thermistor and ambient temperature thermistor

(1) Remove the top panel, cabinet and service panel. (Refer to

1.) (2) Remove the back panel. (Refer to 1.) (3) Disconnect the following connectors;

<Electronic control P.C. board> CN661 (Discharge temperature thermistor, defrost thermis-

tor and outdoor heat exchanger temperature thermistor)

CN663 (Ambient temperature thermistor) (4) Pull out the defrost thermistor from its holder. (5) Pull out the discharge temperature thermistor from its hold-

er. (Photo 8) (6) Pull out the outdoor heat exchanger temperature thermistor

from its holder. (7) Pull out the ambient temperature thermistor from its holder.

Photo 5

Outdoor heat exchanger temperature thermistor

Defrost thermistor

Ambient temperature thermistor

4. Removing outdoor fan motor

(1) Remove the top panel, cabinet and service panel. (Refer to

1.)

(2) Remove the back panel. (Refer to 1.)

(3) Disconnect the following connectors;

CN931 and CN932 (Fan motor)

(4) Remove the propeller. (5) Remove the screws fixing the fan motor. (6) Remove the fan motor.

Photo 6

Screws of the outdoor fan motor

Page 59

OPERATING PROCEDURE PHOTOS

5. Removing the compressor and 4-way valve

(1) Remove the top panel, cabinet and service panel. (Refer to

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

NOTE: Recover gas from the pipes until the pressure gauge

shows 0 MPa (0 kg/cm2).

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

pipe connected with compressor.

(6) Remove the compressor nuts.

(7) Remove the compressor.

(8) Detach the welded part of 4-way valve and pipe.

6. Removing R.V. coil

(1) Remove the top panel, cabinet and service panel. (Refer to

1.)

(2) Remove the back panel. (Refer to 1.) (3) Disconnect the following connectors;

<Noise filter P.C. board> CN912 (R.V. coil)

(4) Remove the R.V. coil.

Photo 7

Welded part of the discharge pipe

Photo 8

Discharge temperature thermistor

Welded part of the suction pipe

Welded parts of 4-way valve

R.V. coil

Page 60

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

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

Mitsubishi MUZ-FD25VABH, MUZ-FD35VABH, MUZ-FD50VABH Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual