Mitsubishi Electric MUFZ-KJ25VE-E1, MUFZ-KJ25VE-ER1, MUFZ-KJ35VE-E1, MUFZ-KJ35VE-ER1, MUFZ-KJ50VE-E1 Service Manual

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Page 1

SERVICE MANUAL

CONTENTS

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

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

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

4. NOISE CRITERIA CURVES ······························ 6

5. OUTLINES AND DIMENSIONS ························ 7

6. WIRING DIAGRAM ············································ 8

7. REFRIGERANT SYSTEM DIAGRAM ············· 10

8. PERFORMANCE CURVES ····························· 12

9. ACTUA TOR CONTROL ··································· 23

10. SERVICE FUNCTIONS ···································· 24

11. TROUBLESHOOTING ····································· 25

12. DISASSEMBLY INSTRUCTIONS ···················· 46

Models

SPLIT-TYPE AIR CONDITIONERS

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

HFC

utilized

R410A

No. OBH667

REVISED EDITION-B

OUTDOOR UNIT

Indoor unit service manual MFZ-KJ•VE Series (OBH666)

PARTS CATALOG (OBB667)

MUFZ-KJ25VE

E1, ER1

MUFZ-KJ35VE

E1, ER1

MUFZ-KJ50VE

E1, ER1

MUFZ-KJ25VE MUFZ-KJ35VE

Please void OBH667 REVISED EDITION-A.

Revision B:

•

MUFZ-KJ25VE -

ER1

, MUFZ-KJ35VE -

ER1

and

MUFZ-KJ50VE -

ER1

have been added.

Page 2

Prepare the proper tools. Prepare the proper protectors. Provide adequate ventilation. After stopping the operation of the air conditioner, turn off the power-supply breaker and remove the power plug. Discharge the capacitor before the work involving the electric parts.

Do not perform the work involving the electric parts with wet hands. Do not pour water into the electric parts. Do not touch the refrigerant. Do not touch the hot or cold areas in the refrigeration cycle. When the repair or the inspection of the circuit needs to be done without turning off the power, exercise great caution not to

touch the live parts.

Use the speciﬁ ed refrigerant only

Never use any refrigerant other than that specified.

Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of. Correct refrigerant is specified in the manuals and on the spec labels provided with our products. We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to follow the instructions.

Revision A:

•

MUFZ-KJ50VE -E1 has been added.

Revision B:

•

MUFZ-KJ25VE -

ER1

, MUFZ-KJ35VE -

ER1

and MUFZ-KJ50VE -

ER1

have been added.

OBH667B

Page 3

MUFZ-KJ25VE -

ER1

MUFZ-KJ35VE -

ER1

MUFZ-KJ50VE -

ER1

1. New model

TECHNICAL CHANGES

Air outlet

Drain outlet

Piping

Drain hose

Air inlet

(back and side)

MUFZ-KJ25VE MUFZ-KJ35VE

PART NAMES AND FUNCTIONS

ACCESSORIES

Model

MUFZ-KJ25VE MUFZ-KJ35VE MUFZ-KJ50VE

Drain socket 1

Piping

Air outlet

Drain outlet

Air inlet

(back and side)

Drain hose

MUFZ-KJ50VE

OBH667B

Page 4

Outdoor model MUFZ-KJ25VE MUFZ-KJ35VE MUFZ-KJ50VE

Power supply Single phase, 230 V, 50 Hz

Capacity Rated frequency (Min.-Max.)

Cooling

2.5 (0.5 - 3.4) 3.5 (0.5 - 3.7) 5.0 (1.6 - 5.7)

Heating 3.4 (1.2 - 4.6) 4.3 (1.2 - 5.5) 6.0 (2.2 - 8.2)

Breaker Capacity A 10 16

Electrical data

Power input 1 (Total)

Cooling

540 940 1,410

Heating 770 1,110 1,610

Running current

(Total)

Cooling

2.7 4.2 6.2

Heating 3.6 5.1 7.1

Power factor

1 (Total)

Cooling

87 98

Heating 91 93 98

Starting current

1 (Total) A 3.6 5.1 7.1

Coefﬁ cient of performance (COP)

1 (Total)

Cooling 4.63 3.72 3.55 Heating 4.42 3.91 3.73

Compressor

Model SNB140FRUMT SNB172FEKMT Output W 950 1,200

Current

Cooling

2.19 3.69 5.18

Heating 3.16 4.61 5.94

Refrigeration oil (Model) L 0.35 (FV50S) 0.40 (FV50S)

Fan motor

Model RC0J50-CI RC0J60-BC

Current

Cooling

0.28 0.82

Heating 0.31 0.82 Dimensions W × H × D mm 800 × 550 × 285 840 × 880 × 330 Weight kg 37 55

Special remarks

Dehumidiﬁ cation Cooling L/h 0.6 1.4 2.0

Air ﬂ ow 1

Cooling

Med.

m3/h

1,806 2,748

Low 1,038 1,632

Heating

High 2,016 2,856

Med. 1,710 2,748

Low 1,326 2,274

Sound level

Cooling

dB(A)

46 47 49

Heating 51

Fan speed

Cooling

Med.

rpm

810 780

Low 490 480

Heating

High 900 810

Med. 770 780

Low 610 650 Fan speed regulator 3 Refrigerant ﬁ lling capacity (R410A) kg 1.10 1.50

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

OBH667B

Page 5

Speciﬁ cations and rated conditions of main electric parts

Model

Item

MUFZ-KJ25VE MUFZ-KJ35VE

Smoothing capacitor

(C61, C62) 600 μF/ 620 μF 420 V

Diode module (DB61) 15 A 600 V

Fuse

(F61) T20AL250V

(F701, F801, F901)

T3.15AL250V

Power module

(IC700) 15 A 600 V

(IC932) 8A600V

Expansion valve coil

(LEV) 12 V DC

Reactor (L61) 23 mH

Power factor controller

(IC820) 20A 600V

Circuit protection

(PTC64, PTC65) 33 Ω

Terminal block (TB) 5 P

Relay

(X63) 3 A 250 V

(X64) 20 A 250 V

(X69) 10A 250V

R.V.coil (21S4) 220 - 240 V AC

Speciﬁ cations and rated conditions of main electric parts

Model

Item

MUZ-KJ50VE

Smoothing capacitor

(CB1, CB2, CB3)

560 μF 450 V

Fuse

(F601, F880, F901)

T3.15AL250 V

IGBT module

(IC932) 5 A 600 V

(IC700) 20 A 600 V

Expansion valve coil

(LEV) 12 V DC

Reactor (L) 340 μH Diode module (IC820) 20 A 600 V

Circuit protection

(PTC64, PTC65) 33 Ω

Terminal block (TB1, TB2) 3 P

Relay

(X64) 20 A 250 V (X65) 20 A 250 V

(X69) 10 A 250 V (X601) 3 A 250 V (X602) 3 A 250 V

R.V. coil (21S4) 220 - 240 V AC

OBH667B

Page 6

63 125 250 500 1000 2000 4000 8000

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

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

BAND CENTER FREQUENCIES, Hz

COOLING

FUNCTION

SPL(dB(A)) LINE

HEATING

46 51

NC-10

MUFZ-KJ25VE

63 125 250 500 1000 2000 4000 8000

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

COOLING

FUNCTION

SPL(dB(A))

LINE

HEATING

47 51

NC-10

MUFZ-KJ35VE

NOISE CRITERIA CURVES

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

OUTDOOR UNIT

MICROPHONE

1 m

63 125 250 500 1000 2000 4000 8000

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

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

BAND CENTER FREQUENCIES, Hz

NC-10

COOLING

FUNCTION

SPL(dB(A)) LINE

HEATING

49 51

MUFZ-KJ50VE

OBH667B

Page 7

800

302.5 500 Bolt pitch for installation

150

22.3

Handle

550

280

164.5

99.5

170.5

Service panel

Service port

285

344.5

400

Air in

Air out

Air in

17.5

Bolt pitch for

installation

304~325

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

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

2 holes 10 X 21

Drain hole ø42

REQUIRED SPACE

350 mm or more

100 mm or more

*1 100 mm or more when front and sides of the unit are clear

*2 When any 2 sides of left, right and rear of the unit are clear

Clear *1

200 mm or

more *2

Unit: mm

MUFZ-KJ25VE MUFZ-KJ35VE

OUTLINES AND DIMENSIONS

MUFZ-KJ50VE

417.5

Drain hole

175

500

330

Air in

Air out

2-holes 10 21

360

840

109

880

452

Service panel

99.5

164.5 195

Liquid refrigerant pipe joint Refrigerant pipe (flared)

Ø 6.35

Gas refrigerant pipe joint Refrigerant pipe (flared)

Ø 12.7

350 mm or more

100 mm or more

REQUIRED SPACE

100 mm or more

500 mm

or more *2

*1 500 mm or more when front and sides of the unit are clear

*2 When any 2 sides of left, right and rear of the unit are clear

Clear *1

OBH667B

Page 8

WIRING DIAGRAM

MUFZ-KJ25VE MUFZ-KJ35VE

OBH667B

Page 9

MUFZ-KJ50VE

OBH667B

Page 10

Unit: mm

MUFZ-KJ25VE MUFZ-KJ35VE

Outdoor heat exchanger

Flared connection

Defrost thermistor RT61

Discharge temperature thermistor RT62

Flared connection

Stop valve (with strainar)

Stop valve

Refrigerant flow in cooling

Compressor

4-way valve

Refrigerant flow in heating

Refrigerant pipe ø9.52 (with heat insulator)

Refrigerant pipe ø6.35 (with heat insulator)

R.V. coil heating ON cooling OFF

Strainer #100

LEV

Ambient temperature thermistor RT65

Muffler

Capillary tube ø4.0×ø2.4×240

Outdoor heat exchanger temperature thermistor RT68

Capillary tube ø3.0×ø2.0×210

Muffler

REFRIGERANT SYSTEM DIAGRAM

MUFZ-KJ50VE

Outdoor heat exchanger

Flared connection

Defrost thermistor RT61

Discharge temperature thermistor RT62

Flared connection

Stop valve

Capillary tube

4.0

2.4×100 Refrigerant flow in cooling

Compressor

4-way valve

Refrigerant flow in heating

Refrigerant pipe

12.7

(with heat insulator)

Refrigerant pipe ø6.35 (with heat insulator)

LEV

Muffler

R.V. coil heating ON cooling OFF

Muffler

#100

Strainer

#100

Outdoor heat exchanger temperature thermistor RT68

Ambient temperature thermistor RT65

Strainer

#100

OBH667B

Page 11

Max. Length A

Max. Height

difference

Indoor unit

Outdoor unit

MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE

Model

Refrigerant piping: m Piping size O.D: mm

Max. Length A Max. Height difference B Gas Liquid

MUFZ-KJ25/35 20 12 9.52 6.35 MUFZ-KJ50 30 15 12.7 6.35

ADDITIONAL REFRIGERANT CHARGE (R410A: g)

Model

Outdoor unit

precharged

Refrigerant piping length (one way)

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

MUFZ-KJ25/35 1,100

0 30 60 90 120 150 180 210 240 390

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

Model

Outdoor unit

precharged

Refrigerant piping length (one way)

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

MUFZ-KJ50 1,500 0 60 160 260 360 460

Calculation: X g = 20 g/m × (Refrigerant piping length (m) – 7)

OBH667B

Page 12

PERFORMANCE CURVES8

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

(1) GUARANTEED VOLTAGE

198 ~ 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]

}

Cooling

(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]

}

Heating(6) Outdoor intake air wet-bulb temperature: °C [WB] (7) Total input: W Indoor air wet and dry bulb temperature difference on the left side of the following chart shows the difference between the indoor intake air wet and dry bulb temperature and the indoor outlet air wet and dry bulb temperature for your reference at service.

How to measure the indoor air wet and 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.

MUFZ-KJ25VE MUFZ-KJ35VE MUFZ-KJ50VE

INDOOR UNIT OUTDOOR UNIT

Wet and dry bulb thermometers FRONT VIEW

Wet and dry bulb thermometers BACK VIEW

Cooling capacity (

at Rated frequency)

0.9

1.0

1.1

1.2

1.3

1.4

1.5

-10-5 0 5 1015202530354045 Outdoor intake air Dry-bulb temperature(°C)

Capacity correction factors

20 18

Indoor intake air Wet-bulb temperature( )

MUFZ-KJ35VE

MUFZ-KJ25VE

Indoor air Wet-bulb temperature

difference (°C)

8.5

7.9

7.2

6.6

6.0

5.4

4.8

12.9

11.8

10.8

9.8

8.8

7.9

7.0

14.6

13.4

12.2

11.0

9.9

8.9

7.8

MUFZ-KJ50VE

8-1. CAPACITY AND INPUT CURVES

OBH667B

Page 13

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

0.8

0.9

1.0

1.1

1.2

1.3

-10-5 0 5 1015202530354045 Outdoor intake air Dry-bulb temperature (°C)

Input correction factors

22 20 18

Indoor intake air Wet-bulb temperature( )

Indoor air Wet-bulb temperature

difference (°C)

7.2

6.6

6.0

5.4

4.8

4.2

10.8

9.8

8.8

7.9

7.0

6.1

MUFZ-KJ35VE

12.2

11.0

9.9

8.9

7.8

6.8

MUFZ-KJ50VE

MUFZ-KJ25VE

Total input (Cooling :

at Rated frequency

)

Indoor air Dry-bulb temperature

difference (°C)

22.9

21.2

19.4

17.6

15.9

14.1

12.3

10.6

8.8

7.1

MUFZ-KJ25VE

29.0

26.8

24.5

22.3

20.1

17.8

15.6

13.4

11.1

8.9

MUFZ-KJ35VE

28.0

25.9

23.7

21.6

19.4

17.2

15.1

12.9

10.8

8.6

MUFZ-KJ50VE

Outdoor intake air Wet-bulb temperature (°C)

-15 -10 -5 0 5 10 15

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

Heating capacity (

at Rated frequency)

Capacity correction factor

Indoor intake air Dry-bulb temperature ( )

Indoor air Dry-bulb temperature

difference (°C)

22.9

21.2

19.4

17.6

15.9

14.1

12.3

10.6

8.8

7.1

MUFZ-KJ25VE

29.0

26.8

24.5

22.3

20.1

17.8

15.6

13.4

11.1

8.9

MUFZ-KJ35VE

28.0

25.9

23.7

21.6

19.4

17.2

15.1

12.9

10.8

8.6

MUFZ-KJ50VE

Outdoor intake air Wet-bulb temperature (°C)

-15 -10 -5 0 5 10 15

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

Total input (Heating :

at Rated frequency

)

Input correction factor

Indoor intake air Dry-bulb temperature ( )

OBH667B

Page 14

8-2. CAPACITY AND INPUT CORRECTION BY OPERATIONAL FREQUENCY OF COMPRESSOR

0 50 100

0.5

1.0

1.5

0 50 100

0.5

1.0

1.5

0 50 100

0.5

1.0

1.5

0 50 100

150

0.5

1.0

1.5

2.0

050100

150

0 50 100

150

0.5

1.0

1.5

2.0

050100

150

MUFZ-KJ25VE

MUFZ-KJ35VE

Correction of Coolin g capacity

The operational frequency of compressor (Hz)

Capacity correction factors

Correction of Cooling input

The operationalfrequency of compressor (Hz)

Input correction factors

Correction of Heating capacity

The operational frequency of compressor (Hz)

Capacity correction factors

Correction of Heati nginput

The operational frequency of compressor (Hz)

Input correction factors

Correction of Cooling capacity

The operational frequency of compressor (Hz)

Capacity correction factors

Correction of Cooling input

The operational frequency of compressor (Hz)

Input correction factors

Correction of Heati ngcapacity

The operational frequency of compressor (Hz)

Capacity correction factors

Correction of Heati nginput

The operational frequenc y of compressor (Hz)

Input correction factors

Correction of Cooling capacity

Capacity correction factors

Correction of Cooling input

Input correction factors

Correction of Heating capacity

Capacity correction factors

MUFZ-KJ50VE

Correction of Heating input

Capacity correction factors

The operational frequency of compressor (Hz)

The operational frequency of compressor (H z)

The operational frequency of compressor (Hz)

0 50 100

0.5

1.0

1.5

2.0

0 50 100

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

8-3. 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.

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.

OBH667B

Page 15

15 20 25 30 35

0.4

0.5

0.6

0.7

0.8

0.9

15 20 25 30 35

0.4

0.5

0.6

0.7

0.8

Ambient temperature(°C) Ambient humidity(%)

15 20 25 30 35

0.3

0.4

0.5

0.6

0.7

0.8

(kgf/cm2[Gauge])(MPa [Gauge])

50 60 70

Ambient temperature(°C) Ambient humidity(%)

50 60 70

Ambient temperature(°C) Ambient humidity(%)

Outdoor low pressure

MUFZ-KJ25VE MUFZ-KJ35VE

MUFZ-KJ50VE

(kgf/cm2[Gauge])(MPa [Gauge])

50 60 70

COOL operation

Both indoor and outdoor unit are under the same temperature/

humidity condition.

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

8-4. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT

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

20 50 25 60 30 70

NOTE: The unit of pressure has been changed to MPa on the international system of units (SI unit system) The conversion factor is: 1 (MPa [Gauge]) = 10.2 (kgf/cm2 [Gauge])

15 20 25 30 35

1.5

2.0

2.5

3.0

15 20 25 30 35

2.5

3.0

3.5

4.0

4.5

Ambient temperature (°C) Ambient humidity(%)

50 60 70 50 60 70 50 60 70

Outdoor current (A)

Ambient temperature (°C) Ambient humidity(%)

Outdoor current (A)

MUFZ-KJ35VEMUFZ-KJ25VE

Outdoor unit current

15 20 25 30 35

MUFZ-KJ50VE

Ambient temperature (°C) Ambient humidity(%)

Outdoor current (A)

0510

15 20 25

2.5

3.0

3.5

4.0

4.5

0 5 10 15 20 25

0510

15 20 25

4.0

4.5

5.0

5.5

6.0

Ambient temperature (°C)

Outdoor current (A)

MUFZ-KJ35VEMUFZ-KJ25VE

Outdoor unit current

MUFZ-KJ50VE

Ambient temperature (°C)

Outdoor current (A)

Ambient temperature (°C)

Outdoor current (A)

Condition:

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

HEAT operation

Indoor Outdoor

Dry bulb temperature (°C) 20.0 2 7 15 20.0

Wet bulb temperature (°C) 14.5 1 6 12 14.5

OBH667B

Page 16

PERFORMANCE DATA COOL operation at Rated frequency

MUFZ-KJ25VE

CAPACITY: 2.5 kW SHF: 0.85 INPUT: 540 W

INDOOR

DB (°C)

INDOOR

WB (°C)

OUTDOOR DB (°C)

21 25 27 30

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

21 18 2.94 1.97 0.67 432 2.81 1.88 0.67 454 2.70 1.81 0.67 475 2.60 1.74 0.67 497

21 20 3.06 1.68 0.55 454 2.94 1.62 0.55 481 2.85 1.57 0.55 491 2.75 1.51 0.55 513

22 18 2.94 2.09 0.71 432 2.81 2.00 0.71 454 2.70 1.92 0.71 475 2.60 1.85 0.71 497

22 20 3.06 1.81 0.59 454 2.94 1.73 0.59 481 2.85 1.68 0.59 491 2.75 1.62 0.59 513

22 22 3.19 1.50 0.47 470 3.08 1.45 0.47 500 3.00 1.41 0.47 513 2.88 1.35 0.47 535

23 18 2.94 2.20 0.75 432 2.81 2.11 0.75 454 2.70 2.03 0.75 475 2.60 1.95 0.75 497

23 20 3.06 1.93 0.63 454 2.94 1.85 0.63 481 2.85 1.80 0.63 491 2.75 1.73 0.63 513

23 22 3.19 1.63 0.51 470 3.08 1.57 0.51 500 3.00 1.53 0.51 513 2.88 1.47 0.51 535

24 18 2.94 2.32 0.79 432 2.81 2.22 0.79 454 2.70 2.13 0.79 475 2.60 2.05 0.79 497

24 20 3.06 2.05 0.67 454 2.94 1.97 0.67 481 2.85 1.91 0.67 491 2.75 1.84 0.67 513

24 22 3.19 1.75 0.55 470 3.08 1.69 0.55 500 3.00 1.65 0.55 513 2.88 1.58 0.55 535

24 24 3.35 1.44 0.43 491 3.23 1.39 0.43 518 3.15 1.35 0.43 535 3.05 1.31 0.43 562

25 18 2.94 2.44 0.83 432 2.81 2.33 0.83 454 2.70 2.24 0.83 475 2.60 2.16 0.83 497

25 20 3.06 2.17 0.71 454 2.94 2.09 0.71 481 2.85 2.02 0.71 491 2.75 1.95 0.71 513

25 22 3.19 1.88 0.59 470 3.08 1.81 0.59 500 3.00 1.77 0.59 513 2.88 1.70 0.59 535

25 24 3.35 1.57 0.47 491 3.23 1.52 0.47 518 3.15 1.48 0.47 535 3.05 1.43 0.47 562

26 18 2.94 2.56 0.87 432 2.81 2.45 0.87 454 2.70 2.35 0.87 475 2.60 2.26 0.87 497

26 20 3.06 2.30 0.75 454 2.94 2.20 0.75 481 2.85 2.14 0.75 491 2.75 2.06 0.75 513

26 22 3.19 2.01 0.63 470 3.08 1.94 0.63 500 3.00 1.89 0.63 513 2.88 1.81 0.63 535

26 24 3.35 1.71 0.51 491 3.23 1.64 0.51 518 3.15 1.61 0.51 535 3.05 1.56 0.51 562

26 26 3.45 1.35 0.39 518 3.35 1.31 0.39 545 3.30 1.29 0.39 562 3.20 1.25 0.39 578

27 18 2.94 2.67 0.91 432 2.81 2.56 0.91 454 2.70 2.46 0.91 475 2.60 2.37 0.91 497

27 20 3.06 2.42 0.79 454 2.94 2.32 0.79 481 2.85 2.25 0.79 491 2.75 2.17 0.79 513

27 22 3.19 2.14 0.67 470 3.08 2.06 0.67 500 3.00 2.01 0.67 513 2.88 1.93 0.67 535

27 24 3.35 1.84 0.55 491 3.23 1.77 0.55 518 3.15 1.73 0.55 535 3.05 1.68 0.55 562

27 26 3.45 1.48 0.43 518 3.35 1.44 0.43 545 3.30 1.42 0.43 562 3.20 1.38 0.43 578

28 18 2.94 2.79 0.95 432 2.81 2.67 0.95 454 2.70 2.57 0.95 475 2.60 2.47 0.95 497

28 20 3.06 2.54 0.83 454 2.94 2.44 0.83 481 2.85 2.37 0.83 491 2.75 2.28 0.83 513

28 22 3.19 2.26 0.71 470 3.08 2.18 0.71 500 3.00 2.13 0.71 513 2.88 2.04 0.71 535

28 24 3.35 1.98 0.59 491 3.23 1.90 0.59 518 3.15 1.86 0.59 535 3.05 1.80 0.59 562

28 26 3.45 1.62 0.47 518 3.35 1.57 0.47 545 3.30 1.55 0.47 562 3.20 1.50 0.47 578

29 18 2.94 2.91 0.99 432 2.81 2.78 0.99 454 2.70 2.67 0.99 475 2.60 2.57 0.99 497

29 20 3.06 2.66 0.87 454 2.94 2.56 0.87 481 2.85 2.48 0.87 491 2.75 2.39 0.87 513

29 22 3.19 2.39 0.75 470 3.08 2.31 0.75 500 3.00 2.25 0.75 513 2.88 2.16 0.75 535

29 24 3.35 2.11 0.63 491 3.23 2.03 0.63 518 3.15 1.98 0.63 535 3.05 1.92 0.63 562

29 26 3.45 1.76 0.51 518 3.35 1.71 0.51 545 3.30 1.68 0.51 562 3.20 1.63 0.51 578

30 18 2.94 2.94 1.00 432 2.81 2.81 1.00 454 2.70 2.70 1.00 475 2.60 2.60 1.00 497

30 20 3.06 2.79 0.91 454 2.94 2.67 0.91 481 2.85 2.59 0.91 491 2.75 2.50 0.91 513

30 22 3.19 2.52 0.79 470 3.08 2.43 0.79 500 3.00 2.37 0.79 513 2.88 2.27 0.79 535

30 24 3.35 2.24 0.67 491 3.23 2.16 0.67 518 3.15 2.11 0.67 535 3.05 2.04 0.67 562

30 26 3.45 1.90 0.55 518 3.35 1.84 0.55 545 3.30 1.82 0.55 562 3.20 1.76 0.55 578

31 18 2.94 2.94 1.00 432 2.81 2.81 1.00 454 2.70 2.70 1.00 475 2.60 2.60 1.00 497

31 20 3.06 2.91 0.95 454 2.94 2.79 0.95 481 2.85 2.71 0.95 491 2.75 2.61 0.95 513

31 22 3.19 2.65 0.83 470 3.08 2.55 0.83 500 3.00 2.49 0.83 513 2.88 2.39 0.83 535

31 24 3.35 2.38 0.71 491 3.23 2.29 0.71 518 3.15 2.24 0.71 535 3.05 2.17 0.71 562

31 26 3.45 2.04 0.59 518 3.35 1.98 0.59 545 3.30 1.95 0.59 562 3.20 1.89 0.59 578

32 18 2.94 2.94 1.00 432 2.81 2.81 1.00 454 2.70 2.70 1.00 475 2.60 2.60 1.00 497

32 20 3.06 3.03 0.99 454 2.94 2.91 0.99 481 2.85 2.82 0.99 491 2.75 2.72 0.99 513

32 22 3.19 2.77 0.87 470 3.08 2.68 0.87 500 3.00 2.61 0.87 513 2.88 2.50 0.87 535

32 24 3.35 2.51 0.75 491 3.23 2.42 0.75 518 3.15 2.36 0.75 535 3.05 2.29 0.75 562

32 26 3.45 2.17 0.63 518 3.35 2.11 0.63 545 3.30 2.08 0.63 562 3.20 2.02 0.63 578

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

OBH667B

Page 17

PERFORMANCE DATA COOL operation at Rated frequency

MUFZ-KJ25VE

CAPACITY: 2.5 kW SHF: 0.85 INPUT: 540 W

INDOOR

DB (°C)

INDOOR

WB (°C)

OUTDOOR DB (°C)

35 40 46

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

21 18 2.45 1.64 0.67 529 2.25 1.51 0.67 562 2.08 1.39 0.67 583

21 20 2.58 1.42 0.55 551 2.40 1.32 0.55 578 2.23 1.22 0.55 610

22 18 2.45 1.74 0.71 529 2.25 1.60 0.71 562 2.08 1.47 0.71 583

22 20 2.58 1.52 0.59 551 2.40 1.42 0.59 578 2.23 1.31 0.59 610

22 22 2.73 1.28 0.47 572 2.55 1.20 0.47 605 2.38 1.12 0.47 626

23 18 2.45 1.84 0.75 529 2.25 1.69 0.75 562 2.08 1.56 0.75 583

23 20 2.58 1.62 0.63 551 2.40 1.51 0.63 578 2.23 1.40 0.63 610

23 22 2.73 1.39 0.51 572 2.55 1.30 0.51 605 2.38 1.21 0.51 626

24 18 2.45 1.94 0.79 529 2.25 1.78 0.79 562 2.08 1.64 0.79 583

24 20 2.58 1.73 0.67 551 2.40 1.61 0.67 578 2.23 1.49 0.67 610

24 22 2.73 1.50 0.55 572 2.55 1.40 0.55 605 2.38 1.31 0.55 626

24 24 2.88 1.24 0.43 594 2.70 1.16 0.43 621 2.55 1.10 0.43 648

25 18 2.45 2.03 0.83 529 2.25 1.87 0.83 562 2.08 1.72 0.83 583

25 20 2.58 1.83 0.71 551 2.40 1.70 0.71 578 2.23 1.58 0.71 610

25 22 2.73 1.61 0.59 572 2.55 1.50 0.59 605 2.38 1.40 0.59 626

25 24 2.88 1.35 0.47 594 2.70 1.27 0.47 621 2.55 1.20 0.47 648

26 18 2.45 2.13 0.87 529 2.25 1.96 0.87 562 2.08 1.81 0.87 583

26 20 2.58 1.93 0.75 551 2.40 1.80 0.75 578 2.23 1.67 0.75 610

26 22 2.73 1.72 0.63 572 2.55 1.61 0.63 605 2.38 1.50 0.63 626

26 24 2.88 1.47 0.51 594 2.70 1.38 0.51 621 2.55 1.30 0.51 648

26 26 3.03 1.18 0.39 616 2.85 1.11 0.39 643 2.68 1.04 0.39 670

27 18 2.45 2.23 0.91 529 2.25 2.05 0.91 562 2.08 1.89 0.91 583

27 20 2.58 2.03 0.79 551 2.40 1.90 0.79 578 2.23 1.76 0.79 610

27 22 2.73 1.83 0.67 572 2.55 1.71 0.67 605 2.38 1.59 0.67 626

27 24 2.88 1.58 0.55 594 2.70 1.49 0.55 621 2.55 1.40 0.55 648

27 26 3.03 1.30 0.43 616 2.85 1.23 0.43 643 2.68 1.15 0.43 670

28 18 2.45 2.33 0.95 529 2.25 2.14 0.95 562 2.08 1.97 0.95 583

28 20 2.58 2.14 0.83 551 2.40 1.99 0.83 578 2.23 1.85 0.83 610

28 22 2.73 1.93 0.71 572 2.55 1.81 0.71 605 2.38 1.69 0.71 626

28 24 2.88 1.70 0.59 594 2.70 1.59 0.59 621 2.55 1.50 0.59 648

28 26 3.03 1.42 0.47 616 2.85 1.34 0.47 643 2.68 1.26 0.47 670

29 18 2.45 2.43 0.99 529 2.25 2.23 0.99 562 2.08 2.05 0.99 583

29 20 2.58 2.24 0.87 551 2.40 2.09 0.87 578 2.23 1.94 0.87 610

29 22 2.73 2.04 0.75 572 2.55 1.91 0.75 605 2.38 1.78 0.75 626

29 24 2.88 1.81 0.63 594 2.70 1.70 0.63 621 2.55 1.61 0.63 648

29 26 3.03 1.54 0.51 616 2.85 1.45 0.51 643 2.68 1.36 0.51 670

30 18 2.45 2.45 1.00 529 2.25 2.25 1.00 562 2.08 2.08 1.00 583

30 20 2.58 2.34 0.91 551 2.40 2.18 0.91 578 2.23 2.02 0.91 610

30 22 2.73 2.15 0.79 572 2.55 2.01 0.79 605 2.38 1.88 0.79 626

30 24 2.88 1.93 0.67 594 2.70 1.81 0.67 621 2.55 1.71 0.67 648

30 26 3.03 1.66 0.55 616 2.85 1.57 0.55 643 2.68 1.47 0.55 670

31 18 2.45 2.45 1.00 529 2.25 2.25 1.00 562 2.08 2.08 1.00 583

31 20 2.58 2.45 0.95 551 2.40 2.28 0.95 578 2.23 2.11 0.95 610

31 22 2.73 2.26 0.83 572 2.55 2.12 0.83 605 2.38 1.97 0.83 626

31 24 2.88 2.04 0.71 594 2.70 1.92 0.71 621 2.55 1.81 0.71 648

31 26 3.03 1.78 0.59 616 2.85 1.68 0.59 643 2.68 1.58 0.59 670

32 18 2.45 2.45 1.00 529 2.25 2.25 1.00 562 2.08 2.08 1.00 583

32 20 2.58 2.55 0.99 551 2.40 2.38 0.99 578 2.23 2.20 0.99 610

32 22 2.73 2.37 0.87 572 2.55 2.22 0.87 605 2.38 2.07 0.87 626

32 24 2.88 2.16 0.75 594 2.70 2.03 0.75 621 2.55 1.91 0.75 648

32 26 3.03 1.91 0.63 616 2.85 1.80 0.63 643 2.68 1.69 0.63 670

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

OBH667B

Page 18

PERFORMANCE DATA COOL operation at Rated frequency

MUFZ-KJ35VE

CAPACITY: 3.5 kW SHF: 0.73 INPUT: 940 W

INDOOR

DB (°C)

INDOOR

WB (°C)

OUTDOOR DB (°C)

21 25 27 30

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

21 18 4.11 2.26 0.55 752 3.94 2.17 0.55 790 3.78 2.08 0.55 827 3.64 2.00 0.55 865

21 20 4.29 1.84 0.43 790 4.11 1.77 0.43 837 3.99 1.72 0.43 855 3.85 1.66 0.43 893

22 18 4.11 2.43 0.59 752 3.94 2.32 0.59 790 3.78 2.23 0.59 827 3.64 2.15 0.59 865

22 20 4.29 2.02 0.47 790 4.11 1.93 0.47 837 3.99 1.88 0.47 855 3.85 1.81 0.47 893

22 22 4.46 1.56 0.35 818 4.31 1.51 0.35 870 4.20 1.47 0.35 893 4.03 1.41 0.35 931

23 18 4.11 2.59 0.63 752 3.94 2.48 0.63 790 3.78 2.38 0.63 827 3.64 2.29 0.63 865

23 20 4.29 2.19 0.51 790 4.11 2.10 0.51 837 3.99 2.03 0.51 855 3.85 1.96 0.51 893

23 22 4.46 1.74 0.39 818 4.31 1.68 0.39 870 4.20 1.64 0.39 893 4.03 1.57 0.39 931

24 18 4.11 2.76 0.67 752 3.94 2.64 0.67 790 3.78 2.53 0.67 827 3.64 2.44 0.67 865

24 20 4.29 2.36 0.55 790 4.11 2.26 0.55 837 3.99 2.19 0.55 855 3.85 2.12 0.55 893

24 22 4.46 1.92 0.43 818 4.31 1.85 0.43 870 4.20 1.81 0.43 893 4.03 1.73 0.43 931

24 24 4.69 1.45 0.31 855 4.52 1.40 0.31 902 4.41 1.37 0.31 931 4.27 1.32 0.31 978

25 18 4.11 2.92 0.71 752 3.94 2.80 0.71 790 3.78 2.68 0.71 827 3.64 2.58 0.71 865

25 20 4.29 2.53 0.59 790 4.11 2.43 0.59 837 3.99 2.35 0.59 855 3.85 2.27 0.59 893

25 22 4.46 2.10 0.47 818 4.31 2.02 0.47 870 4.20 1.97 0.47 893 4.03 1.89 0.47 931

25 24 4.69 1.64 0.35 855 4.52 1.58 0.35 902 4.41 1.54 0.35 931 4.27 1.49 0.35 978

26 18 4.11 3.08 0.75 752 3.94 2.95 0.75 790 3.78 2.84 0.75 827 3.64 2.73 0.75 865

26 20 4.29 2.70 0.63 790 4.11 2.59 0.63 837 3.99 2.51 0.63 855 3.85 2.43 0.63 893

26 22 4.46 2.28 0.51 818 4.31 2.20 0.51 870 4.20 2.14 0.51 893 4.03 2.05 0.51 931

26 24 4.69 1.83 0.39 855 4.52 1.76 0.39 902 4.41 1.72 0.39 931 4.27 1.67 0.39 978

26 26 4.83 1.30 0.27 902 4.69 1.27 0.27 949 4.62 1.25 0.27 978 4.48 1.21 0.27 1006

27 18 4.11 3.25 0.79 752 3.94 3.11 0.79 790 3.78 2.99 0.79 827 3.64 2.88 0.79 865

27 20 4.29 2.87 0.67 790 4.11 2.76 0.67 837 3.99 2.67 0.67 855 3.85 2.58 0.67 893

27 22 4.46 2.45 0.55 818 4.31 2.37 0.55 870 4.20 2.31 0.55 893 4.03 2.21 0.55 931

27 24 4.69 2.02 0.43 855 4.52 1.94 0.43 902 4.41 1.90 0.43 931 4.27 1.84 0.43 978

27 26 4.83 1.50 0.31 902 4.69 1.45 0.31 949 4.62 1.43 0.31 978 4.48 1.39 0.31 1006

28 18 4.11 3.41 0.83 752 3.94 3.27 0.83 790 3.78 3.14 0.83 827 3.64 3.02 0.83 865

28 20 4.29 3.04 0.71 790 4.11 2.92 0.71 837 3.99 2.83 0.71 855 3.85 2.73 0.71 893

28 22 4.46 2.63 0.59 818 4.31 2.54 0.59 870 4.20 2.48 0.59 893 4.03 2.37 0.59 931

28 24 4.69 2.20 0.47 855 4.52 2.12 0.47 902 4.41 2.07 0.47 931 4.27 2.01 0.47 978

28 26 4.83 1.69 0.35 902 4.69 1.64 0.35 949 4.62 1.62 0.35 978 4.48 1.57 0.35 1006

29 18 4.11 3.58 0.87 752 3.94 3.43 0.87 790 3.78 3.29 0.87 827 3.64 3.17 0.87 865

29 20 4.29 3.22 0.75 790 4.11 3.08 0.75 837 3.99 2.99 0.75 855 3.85 2.89 0.75 893

29 22 4.46 2.81 0.63 818 4.31 2.71 0.63 870 4.20 2.65 0.63 893 4.03 2.54 0.63 931

29 24 4.69 2.39 0.51 855 4.52 2.30 0.51 902 4.41 2.25 0.51 931 4.27 2.18 0.51 978

29 26 4.83 1.88 0.39 902 4.69 1.83 0.39 949 4.62 1.80 0.39 978 4.48 1.75 0.39 1006

30 18 4.11 3.74 0.91 752 3.94 3.58 0.91 790 3.78 3.44 0.91 827 3.64 3.31 0.91 865

30 20 4.29 3.39 0.79 790 4.11 3.25 0.79 837 3.99 3.15 0.79 855 3.85 3.04 0.79 893

30 22 4.46 2.99 0.67 818 4.31 2.88 0.67 870 4.20 2.81 0.67 893 4.03 2.70 0.67 931

30 24 4.69 2.58 0.55 855 4.52 2.48 0.55 902 4.41 2.43 0.55 931 4.27 2.35 0.55 978

30 26 4.83 2.08 0.43 902 4.69 2.02 0.43 949 4.62 1.99 0.43 978 4.48 1.93 0.43 1006

31 18 4.11 3.91 0.95 752 3.94 3.74 0.95 790 3.78 3.59 0.95 827 3.64 3.46 0.95 865

31 20 4.29 3.56 0.83 790 4.11 3.41 0.83 837 3.99 3.31 0.83 855 3.85 3.20 0.83 893

31 22 4.46 3.17 0.71 818 4.31 3.06 0.71 870 4.20 2.98 0.71 893 4.03 2.86 0.71 931

31 24 4.69 2.77 0.59 855 4.52 2.66 0.59 902 4.41 2.60 0.59 931 4.27 2.52 0.59 978

31 26 4.83 2.27 0.47 902 4.69 2.20 0.47 949 4.62 2.17 0.47 978 4.48 2.11 0.47 1006

32 18 4.11 4.07 0.99 752 3.94 3.90 0.99 790 3.78 3.74 0.99 827 3.64 3.60 0.99 865

32 20 4.29 3.73 0.87 790 4.11 3.58 0.87 837 3.99 3.47 0.87 855 3.85 3.35 0.87 893

32 22 4.46 3.35 0.75 818 4.31 3.23 0.75 870 4.20 3.15 0.75 893 4.03 3.02 0.75 931

32 24 4.69 2.95 0.63 855 4.52 2.84 0.63 902 4.41 2.78 0.63 931 4.27 2.69 0.63 978

32 26 4.83 2.46 0.51 902 4.69 2.39 0.51 949 4.62 2.36 0.51 978 4.48 2.28 0.51 1006

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

OBH667B

Page 19

PERFORMANCE DATA COOL operation at Rated frequency

MUFZ-KJ35VE

CAPACITY: 3.5 kW SHF: 0.73 INPUT: 940 W

INDOOR

DB (°C)

INDOOR

WB (°C)

OUTDOOR DB (°C)

35 40 46

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

21 18 3.43 1.89 0.55 921 3.15 1.73 0.55 978 2.91 1.60 0.55 1015

21 20 3.61 1.55 0.43 959 3.36 1.44 0.43 1006 3.12 1.34 0.43 1062

22 18 3.43 2.02 0.59 921 3.15 1.86 0.59 978 2.91 1.71 0.59 1015

22 20 3.61 1.69 0.47 959 3.36 1.58 0.47 1006 3.12 1.46 0.47 1062

22 22 3.82 1.34 0.35 996 3.57 1.25 0.35 1053 3.33 1.16 0.35 1090

23 18 3.43 2.16 0.63 921 3.15 1.98 0.63 978 2.91 1.83 0.63 1015

23 20 3.61 1.84 0.51 959 3.36 1.71 0.51 1006 3.12 1.59 0.51 1062

23 22 3.82 1.49 0.39 996 3.57 1.39 0.39 1053 3.33 1.30 0.39 1090

24 18 3.43 2.30 0.67 921 3.15 2.11 0.67 978 2.91 1.95 0.67 1015

24 20 3.61 1.98 0.55 959 3.36 1.85 0.55 1006 3.12 1.71 0.55 1062

24 22 3.82 1.64 0.43 996 3.57 1.54 0.43 1053 3.33 1.43 0.43 1090

24 24 4.03 1.25 0.31 1034 3.78 1.17 0.31 1081 3.57 1.11 0.31 1128

25 18 3.43 2.44 0.71 921 3.15 2.24 0.71 978 2.91 2.06 0.71 1015

25 20 3.61 2.13 0.59 959 3.36 1.98 0.59 1006 3.12 1.84 0.59 1062

25 22 3.82 1.79 0.47 996 3.57 1.68 0.47 1053 3.33 1.56 0.47 1090

25 24 4.03 1.41 0.35 1034 3.78 1.32 0.35 1081 3.57 1.25 0.35 1128

26 18 3.43 2.57 0.75 921 3.15 2.36 0.75 978 2.91 2.18 0.75 1015

26 20 3.61 2.27 0.63 959 3.36 2.12 0.63 1006 3.12 1.96 0.63 1062

26 22 3.82 1.95 0.51 996 3.57 1.82 0.51 1053 3.33 1.70 0.51 1090

26 24 4.03 1.57 0.39 1034 3.78 1.47 0.39 1081 3.57 1.39 0.39 1128

26 26 4.24 1.14 0.27 1072 3.99 1.08 0.27 1119 3.75 1.01 0.27 1166

27 18 3.43 2.71 0.79 921 3.15 2.49 0.79 978 2.91 2.29 0.79 1015

27 20 3.61 2.42 0.67 959 3.36 2.25 0.67 1006 3.12 2.09 0.67 1062

27 22 3.82 2.10 0.55 996 3.57 1.96 0.55 1053 3.33 1.83 0.55 1090

27 24 4.03 1.73 0.43 1034 3.78 1.63 0.43 1081 3.57 1.54 0.43 1128

27 26 4.24 1.31 0.31 1072 3.99 1.24 0.31 1119 3.75 1.16 0.31 1166

28 18 3.43 2.85 0.83 921 3.15 2.61 0.83 978 2.91 2.41 0.83 1015

28 20 3.61 2.56 0.71 959 3.36 2.39 0.71 1006 3.12 2.21 0.71 1062

28 22 3.82 2.25 0.59 996 3.57 2.11 0.59 1053 3.33 1.96 0.59 1090

28 24 4.03 1.89 0.47 1034 3.78 1.78 0.47 1081 3.57 1.68 0.47 1128

28 26 4.24 1.48 0.35 1072 3.99 1.40 0.35 1119 3.75 1.31 0.35 1166

29 18 3.43 2.98 0.87 921 3.15 2.74 0.87 978 2.91 2.53 0.87 1015

29 20 3.61 2.70 0.75 959 3.36 2.52 0.75 1006 3.12 2.34 0.75 1062

29 22 3.82 2.40 0.63 996 3.57 2.25 0.63 1053 3.33 2.09 0.63 1090

29 24 4.03 2.05 0.51 1034 3.78 1.93 0.51 1081 3.57 1.82 0.51 1128

29 26 4.24 1.65 0.39 1072 3.99 1.56 0.39 1119 3.75 1.46 0.39 1166

30 18 3.43 3.12 0.91 921 3.15 2.87 0.91 978 2.91 2.64 0.91 1015

30 20 3.61 2.85 0.79 959 3.36 2.65 0.79 1006 3.12 2.46 0.79 1062

30 22 3.82 2.56 0.67 996 3.57 2.39 0.67 1053 3.33 2.23 0.67 1090

30 24 4.03 2.21 0.55 1034 3.78 2.08 0.55 1081 3.57 1.96 0.55 1128

30 26 4.24 1.82 0.43 1072 3.99 1.72 0.43 1119 3.75 1.61 0.43 1166

31 18 3.43 3.26 0.95 921 3.15 2.99 0.95 978 2.91 2.76 0.95 1015

31 20 3.61 2.99 0.83 959 3.36 2.79 0.83 1006 3.12 2.59 0.83 1062

31 22 3.82 2.71 0.71 996 3.57 2.53 0.71 1053 3.33 2.36 0.71 1090

31 24 4.03 2.37 0.59 1034 3.78 2.23 0.59 1081 3.57 2.11 0.59 1128

31 26 4.24 1.99 0.47 1072 3.99 1.88 0.47 1119 3.75 1.76 0.47 1166

32 18 3.43 3.40 0.99 921 3.15 3.12 0.99 978 2.91 2.88 0.99 1015

32 20 3.61 3.14 0.87 959 3.36 2.92 0.87 1006 3.12 2.71 0.87 1062

32 22 3.82 2.86 0.75 996 3.57 2.68 0.75 1053 3.33 2.49 0.75 1090

32 24 4.03 2.54 0.63 1034 3.78 2.38 0.63 1081 3.57 2.25 0.63 1128

32 26 4.24 2.16 0.51 1072 3.99 2.03 0.51 1119 3.75 1.91 0.51 1166

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

OBH667B

Page 20

PERFORMANCE DATA COOL operation at Rated frequency

MUFZ-KJ50VE

CAPACITY: 5.0 kW SHF: 0.71 INPUT: 1410 W

INDOOR

DB (°C)

INDOOR

WB (°C)

OUTDOOR DB (°C)

21 25 27 30

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

21 18 5.88 3.11 0.53 1128 5.63 2.98 0.53 1184 5.40 2.86 0.53 1241 5.20 2.76 0.53 1297

21 20 6.13 2.51 0.41 1184 5.88 2.41 0.41 1255 5.70 2.34 0.41 1283 5.50 2.26 0.41 1340

22 18 5.88 3.35 0.57 1128 5.63 3.21 0.57 1184 5.40 3.08 0.57 1241 5.20 2.96 0.57 1297

22 20 6.13 2.76 0.45 1184 5.88 2.64 0.45 1255 5.70 2.57 0.45 1283 5.50 2.48 0.45 1340

22 22 6.38 2.10 0.33 1227 6.15 2.03 0.33 1304 6.00 1.98 0.33 1340 5.75 1.90 0.33 1396

23 18 5.88 3.58 0.61 1128 5.63 3.43 0.61 1184 5.40 3.29 0.61 1241 5.20 3.17 0.61 1297

23 20 6.13 3.00 0.49 1184 5.88 2.88 0.49 1255 5.70 2.79 0.49 1283 5.50 2.70 0.49 1340

23 22 6.38 2.36 0.37 1227 6.15 2.28 0.37 1304 6.00 2.22 0.37 1340 5.75 2.13 0.37 1396

24 18 5.88 3.82 0.65 1128 5.63 3.66 0.65 1184 5.40 3.51 0.65 1241 5.20 3.38 0.65 1297

24 20 6.13 3.25 0.53 1184 5.88 3.11 0.53 1255 5.70 3.02 0.53 1283 5.50 2.92 0.53 1340

24 22 6.38 2.61 0.41 1227 6.15 2.52 0.41 1304 6.00 2.46 0.41 1340 5.75 2.36 0.41 1396

24 24 6.70 1.94 0.29 1283 6.45 1.87 0.29 1354 6.30 1.83 0.29 1396 6.10 1.77 0.29 1466

25 18 5.88 4.05 0.69 1128 5.63 3.88 0.69 1184 5.40 3.73 0.69 1241 5.20 3.59 0.69 1297

25 20 6.13 3.49 0.57 1184 5.88 3.35 0.57 1255 5.70 3.25 0.57 1283 5.50 3.14 0.57 1340

25 22 6.38 2.87 0.45 1227 6.15 2.77 0.45 1304 6.00 2.70 0.45 1340 5.75 2.59 0.45 1396

25 24 6.70 2.21 0.33 1283 6.45 2.13 0.33 1354 6.30 2.08 0.33 1396 6.10 2.01 0.33 1466

26 18 5.88 4.29 0.73 1128 5.63 4.11 0.73 1184 5.40 3.94 0.73 1241 5.20 3.80 0.73 1297

26 20 6.13 3.74 0.61 1184 5.88 3.58 0.61 1255 5.70 3.48 0.61 1283 5.50 3.36 0.61 1340

26 22 6.38 3.12 0.49 1227 6.15 3.01 0.49 1304 6.00 2.94 0.49 1340 5.75 2.82 0.49 1396

26 24 6.70 2.48 0.37 1283 6.45 2.39 0.37 1354 6.30 2.33 0.37 1396 6.10 2.26 0.37 1466

26 26 6.90 1.73 0.25 1354 6.70 1.68 0.25 1424 6.60 1.65 0.25 1466 6.40 1.60 0.25 1509

27 18 5.88 4.52 0.77 1128 5.63 4.33 0.77 1184 5.40 4.16 0.77 1241 5.20 4.00 0.77 1297

27 20 6.13 3.98 0.65 1184 5.88 3.82 0.65 1255 5.70 3.71 0.65 1283 5.50 3.58 0.65 1340

27 22 6.38 3.38 0.53 1227 6.15 3.26 0.53 1304 6.00 3.18 0.53 1340 5.75 3.05 0.53 1396

27 24 6.70 2.75 0.41 1283 6.45 2.64 0.41 1354 6.30 2.58 0.41 1396 6.10 2.50 0.41 1466

27 26 6.90 2.00 0.29 1354 6.70 1.94 0.29 1424 6.60 1.91 0.29 1466 6.40 1.86 0.29 1509

28 18 5.88 4.76 0.81 1128 5.63 4.56 0.81 1184 5.40 4.37 0.81 1241 5.20 4.21 0.81 1297

28 20 6.13 4.23 0.69 1184 5.88 4.05 0.69 1255 5.70 3.93 0.69 1283 5.50 3.80 0.69 1340

28 22 6.38 3.63 0.57 1227 6.15 3.51 0.57 1304 6.00 3.42 0.57 1340 5.75 3.28 0.57 1396

28 24 6.70 3.02 0.45 1283 6.45 2.90 0.45 1354 6.30 2.84 0.45 1396 6.10 2.75 0.45 1466

28 26 6.90 2.28 0.33 1354 6.70 2.21 0.33 1424 6.60 2.18 0.33 1466 6.40 2.11 0.33 1509

29 18 5.88 4.99 0.85 1128 5.63 4.78 0.85 1184 5.40 4.59 0.85 1241 5.20 4.42 0.85 1297

29 20 6.13 4.47 0.73 1184 5.88 4.29 0.73 1255 5.70 4.16 0.73 1283 5.50 4.02 0.73 1340

29 22 6.38 3.89 0.61 1227 6.15 3.75 0.61 1304 6.00 3.66 0.61 1340 5.75 3.51 0.61 1396

29 24 6.70 3.28 0.49 1283 6.45 3.16 0.49 1354 6.30 3.09 0.49 1396 6.10 2.99 0.49 1466

29 26 6.90 2.55 0.37 1354 6.70 2.48 0.37 1424 6.60 2.44 0.37 1466 6.40 2.37 0.37 1509

30 18 5.88 5.23 0.89 1128 5.63 5.01 0.89 1184 5.40 4.81 0.89 1241 5.20 4.63 0.89 1297

30 20 6.13 4.72 0.77 1184 5.88 4.52 0.77 1255 5.70 4.39 0.77 1283 5.50 4.24 0.77 1340

30 22 6.38 4.14 0.65 1227 6.15 4.00 0.65 1304 6.00 3.90 0.65 1340 5.75 3.74 0.65 1396

30 24 6.70 3.55 0.53 1283 6.45 3.42 0.53 1354 6.30 3.34 0.53 1396 6.10 3.23 0.53 1466

30 26 6.90 2.83 0.41 1354 6.70 2.75 0.41 1424 6.60 2.71 0.41 1466 6.40 2.62 0.41 1509

31 18 5.88 5.46 0.93 1128 5.63 5.23 0.93 1184 5.40 5.02 0.93 1241 5.20 4.84 0.93 1297

31 20 6.13 4.96 0.81 1184 5.88 4.76 0.81 1255 5.70 4.62 0.81 1283 5.50 4.46 0.81 1340

31 22 6.38 4.40 0.69 1227 6.15 4.24 0.69 1304 6.00 4.14 0.69 1340 5.75 3.97 0.69 1396

31 24 6.70 3.82 0.57 1283 6.45 3.68 0.57 1354 6.30 3.59 0.57 1396 6.10 3.48 0.57 1466

31 26 6.90 3.11 0.45 1354 6.70 3.02 0.45 1424 6.60 2.97 0.45 1466 6.40 2.88 0.45 1509

32 18 5.88 5.70 0.97 1128 5.63 5.46 0.97 1184 5.40 5.24 0.97 1241 5.20 5.04 0.97 1297

32 20 6.13 5.21 0.85 1184 5.88 4.99 0.85 1255 5.70 4.84 0.85 1283 5.50 4.68 0.85 1340

32 22 6.38 4.65 0.73 1227 6.15 4.49 0.73 1304 6.00 4.38 0.73 1340 5.75 4.20 0.73 1396

32 24 6.70 4.09 0.61 1283 6.45 3.93 0.61 1354 6.30 3.84 0.61 1396 6.10 3.72 0.61 1466

32 26 6.90 3.38 0.49 1354 6.70 3.28 0.49 1424 6.60 3.23 0.49 1466 6.40 3.14 0.49 1509

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

OBH667B

Page 21

PERFORMANCE DATA COOL operation at Rated frequency

MUFZ-KJ50VE

CAPACITY: 5.0 kW SHF: 0.71 INPUT: 1410 W

INDOOR

DB (°C)

INDOOR

WB (°C)

OUTDOOR DB (°C)

35 40 46

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

21 18 4.90 2.60 0.53 1382 4.50 2.39 0.53 1466 4.15 2.20 0.53 1523

21 20 5.15 2.11 0.41 1438 4.80 1.97 0.41 1509 4.45 1.82 0.41 1593

22 18 4.90 2.79 0.57 1382 4.50 2.57 0.57 1466 4.15 2.37 0.57 1523

22 20 5.15 2.32 0.45 1438 4.80 2.16 0.45 1509 4.45 2.00 0.45 1593

22 22 5.45 1.80 0.33 1495 5.10 1.68 0.33 1579 4.75 1.57 0.33 1636

23 18 4.90 2.99 0.61 1382 4.50 2.75 0.61 1466 4.15 2.53 0.61 1523

23 20 5.15 2.52 0.49 1438 4.80 2.35 0.49 1509 4.45 2.18 0.49 1593

23 22 5.45 2.02 0.37 1495 5.10 1.89 0.37 1579 4.75 1.76 0.37 1636

24 18 4.90 3.19 0.65 1382 4.50 2.93 0.65 1466 4.15 2.70 0.65 1523

24 20 5.15 2.73 0.53 1438 4.80 2.54 0.53 1509 4.45 2.36 0.53 1593

24 22 5.45 2.23 0.41 1495 5.10 2.09 0.41 1579 4.75 1.95 0.41 1636

24 24 5.75 1.67 0.29 1551 5.40 1.57 0.29 1621 5.10 1.48 0.29 1692

25 18 4.90 3.38 0.69 1382 4.50 3.11 0.69 1466 4.15 2.86 0.69 1523

25 20 5.15 2.94 0.57 1438 4.80 2.74 0.57 1509 4.45 2.54 0.57 1593

25 22 5.45 2.45 0.45 1495 5.10 2.30 0.45 1579 4.75 2.14 0.45 1636

25 24 5.75 1.90 0.33 1551 5.40 1.78 0.33 1621 5.10 1.68 0.33 1692

26 18 4.90 3.58 0.73 1382 4.50 3.29 0.73 1466 4.15 3.03 0.73 1523

26 20 5.15 3.14 0.61 1438 4.80 2.93 0.61 1509 4.45 2.71 0.61 1593

26 22 5.45 2.67 0.49 1495 5.10 2.50 0.49 1579 4.75 2.33 0.49 1636

26 24 5.75 2.13 0.37 1551 5.40 2.00 0.37 1621 5.10 1.89 0.37 1692

26 26 6.05 1.51 0.25 1607 5.70 1.43 0.25 1678 5.35 1.34 0.25 1748

27 18 4.90 3.77 0.77 1382 4.50 3.47 0.77 1466 4.15 3.20 0.77 1523

27 20 5.15 3.35 0.65 1438 4.80 3.12 0.65 1509 4.45 2.89 0.65 1593

27 22 5.45 2.89 0.53 1495 5.10 2.70 0.53 1579 4.75 2.52 0.53 1636

27 24 5.75 2.36 0.41 1551 5.40 2.21 0.41 1621 5.10 2.09 0.41 1692

27 26 6.05 1.75 0.29 1607 5.70 1.65 0.29 1678 5.35 1.55 0.29 1748

28 18 4.90 3.97 0.81 1382 4.50 3.65 0.81 1466 4.15 3.36 0.81 1523

28 20 5.15 3.55 0.69 1438 4.80 3.31 0.69 1509 4.45 3.07 0.69 1593

28 22 5.45 3.11 0.57 1495 5.10 2.91 0.57 1579 4.75 2.71 0.57 1636

28 24 5.75 2.59 0.45 1551 5.40 2.43 0.45 1621 5.10 2.30 0.45 1692

28 26 6.05 2.00 0.33 1607 5.70 1.88 0.33 1678 5.35 1.77 0.33 1748

29 18 4.90 4.17 0.85 1382 4.50 3.83 0.85 1466 4.15 3.53 0.85 1523

29 20 5.15 3.76 0.73 1438 4.80 3.50 0.73 1509 4.45 3.25 0.73 1593

29 22 5.45 3.32 0.61 1495 5.10 3.11 0.61 1579 4.75 2.90 0.61 1636

29 24 5.75 2.82 0.49 1551 5.40 2.65 0.49 1621 5.10 2.50 0.49 1692

29 26 6.05 2.24 0.37 1607 5.70 2.11 0.37 1678 5.35 1.98 0.37 1748

30 18 4.90 4.36 0.89 1382 4.50 4.01 0.89 1466 4.15 3.69 0.89 1523

30 20 5.15 3.97 0.77 1438 4.80 3.70 0.77 1509 4.45 3.43 0.77 1593

30 22 5.45 3.54 0.65 1495 5.10 3.32 0.65 1579 4.75 3.09 0.65 1636

30 24 5.75 3.05 0.53 1551 5.40 2.86 0.53 1621 5.10 2.70 0.53 1692

30 26 6.05 2.48 0.41 1607 5.70 2.34 0.41 1678 5.35 2.19 0.41 1748

31 18 4.90 4.56 0.93 1382 4.50 4.19 0.93 1466 4.15 3.86 0.93 1523

31 20 5.15 4.17 0.81 1438 4.80 3.89 0.81 1509 4.45 3.60 0.81 1593

31 22 5.45 3.76 0.69 1495 5.10 3.52 0.69 1579 4.75 3.28 0.69 1636

31 24 5.75 3.28 0.57 1551 5.40 3.08 0.57 1621 5.10 2.91 0.57 1692

31 26 6.05 2.72 0.45 1607 5.70 2.57 0.45 1678 5.35 2.41 0.45 1748

32 18 4.90 4.75 0.97 1382 4.50 4.37 0.97 1466 4.15 4.03 0.97 1523

32 20 5.15 4.38 0.85 1438 4.80 4.08 0.85 1509 4.45 3.78 0.85 1593

32 22 5.45 3.98 0.73 1495 5.10 3.72 0.73 1579 4.75 3.47 0.73 1636

32 24 5.75 3.51 0.61 1551 5.40 3.29 0.61 1621 5.10 3.11 0.61 1692

32 26 6.05 2.96 0.49 1607 5.70 2.79 0.49 1678 5.35 2.62 0.49 1748

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

OBH667B

Page 22

PERFORMANCE DATA HEAT operation at Rated frequency

MUFZ-KJ25VE

CAPACITY: 3.4 kW INPUT: 770 W

INDOOR

DB (°C)

OUTDOOR WB (°C)

-10 -5 0 5 10 15 20

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

15 2.14 501 2.58 601 3.03 678 3.47 732 3.91 778 4.32 801 4.76 816

21 2.04 539 2.45 639 2.89 708 3.30 762 3.74 801 4.15 824 4.57 855

26 1.84 578 2.28 678 2.69 747 3.13 801 3.57 839 3.98 862 4.42 886

MUFZ-KJ35VE

CAPACITY: 4.3 kW INPUT: 1100 W

INDOOR

DB (°C)

OUTDOOR WB (°C)

-10 -5 0 5 10 15 20

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

15 2.71 715 3.27 858 3.83 968 4.39 1045 4.95 1111 5.46 1144 6.02 1166

21 2.58 770 3.10 913 3.66 1012 4.17 1089 4.73 1144 5.25 1177 5.78 1221

26 2.32 825 2.88 968 3.40 1067 3.96 1144 4.52 1199 5.03 1232 5.59 1265

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

MUFZ-KJ50VE

CAPACITY: 6.0 kW INPUT: 1610 W

INDOOR

DB (°C)

OUTDOOR WB (°C)

-10 -5 0 5 10 15 20

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

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 1852

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

OBH667B

Page 23

MUFZ-KJ25VE MUFZ-KJ35VE MUFZ-KJ50VE

9-2. R.V. COIL CONTROL

Heating

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

Cooling

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

OFF

Dry

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

OFF

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

OFF

Outdoor fan motor

Compressor

5 seconds 15 seconds

ON OFF

Compressor

Outdoor fan motor

R.V.coil

ON OFF

<COOL>

5 seconds

<HEAT>

5 seconds

9-1. OUTDOOR FAN MOTOR CONTROL

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

9-3. RELATION BETWEEN MAIN SENSOR AND ACTUATOR

Sensor Purpose

Actuator

Compressor

LEV

Outdoor fan

motor

R.V.coil

Indoor fan

motor

Defrost

heater

Discharge temperature thermistor

Protection

○○

Indoor coil temperature thermistor

Cooling: Coil frost prevention

○

Heating: High pressure protection

○○

Defrost thermistor Heating: Defrosting

○○○○○

Fin temperature thermistor Protection

○○

Ambient temperature thermistor

Cooling: Low ambient temperature operation

○○○

Heating: Defrosting (Heater)

○

Outdoor heat exchanger temperature thermistor

Cooling: Low ambient temperature operation

○○○

Cooling: High pressure protection

○○○

ACTUATOR CONTROL

OBH667B

Page 24

SERVICE FUNCTIONS

10-1. CHANGE IN DEFROST SETTING Changing defrost finish temperature

<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 (Initial setting) 5

None (Cut) 10

10-2. PRE-HEAT CONTROL SETTING

PRE-HEAT CONTROL MUFZ-KJ25/35

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 the discharge temperature thermistor is 20°C or below. When the pre-heat control turns ON, the compressor is energized. (About 50 W)

MUFZ-KJ50

Prolonged low load operation, in which the thermostat is OFF for a long time, at low outside temperature (0°C or less) may cause the following troubles. To prevent those troubles, activate the pre-heat control.

1) If moisture gets into the refrigerant cycle and freezes, it may interfer the start-up of the compressor.

2) If liquid refrigerant collects in the compressor, a failure in the compressor may occur.

The pre-heat control turns ON when the compressor temperature is 20°C or below. When the pre-heat control turns ON, the compressor is energized. (About 70 W)

Pre-heat control setting

<JK> ON: To activate the pre-heat control, cut JK wire of the inverter P.C. board. OFF: To deactivate the pre-heat control, solder 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.

MUFZ-KJ25VE MUFZ-KJ35VE MUFZ-KJ50VE

OBH667B

Page 25

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 of 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.

TROUBLESHOOTING

3. Troubleshooting procedure

1) 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 OPERATION INDICATOR lamp is flashing on and off before starting serv-

ice 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.

Lead wiring

Housing point

MUFZ-KJ25VE MUFZ-KJ35VE MUFZ-KJ50VE

OBH667B

Page 26

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.

11-2. FAILURE MODE RECALL FUNCTION

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

NOTE: 1. Make sure to release the failure mode recall function after it is 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.

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

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

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

Yes

The cause of abnormality cannot be found because the abnormality does not recur.

Setting up the failure mode recall function

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

While pressing OPERATION SELECT (MODE) button and TEMP

button on the

remote controller at the same time, press RESET button.

First, release RESET button.

Hold down the other two buttons for another 3 seconds. Make sure that the indicators

on the LCD screen shown in the right ﬁ gure are all displayed. Then release the but- tons.

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

Judgment of indoor/outdoor abnormality

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

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

Releasing the failure mode recall function

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

Repair the failure parts.

Deleting the memorized abnormal condition

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. 4 Release the failure mode recall function according to "Releasing the failure mode recall function"

mentioned above.

Operational procedure

Yes (Blinks)

No (OFF)

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

2. Blinking pattern when the indoor unit is abnormal:

3.Blinking pattern when the outdoor unit is abnormal:

OFF

Beeps

Repeated cycle Repeated cycle

OFF

No beep Beeps

Repeated cycle

2.5-second OFF

Blinking at 0.5second interval

2.5-second OFF 3-second ON

Blinking at 0.5second interval

Beeps

Repeated cycle

2.5-second OFF

Blinking at 0.5second interval

No beep Beeps

Repeated cycle

2.5-second OFF 3-second ON

Blinking at 0.5second interval

Repeated cycle

Beeps

AMPM AM PM

NOTE: It takes up to 1 minute to indicate the outdoor unit abnormality. Even if the OPERATION INDICATOR lamp is not lighting, keep checking

at least 1 minute or longer.

4 The information regarding whether the connected

outdoor unit is a low-standby-power model or a non-lowstandby-power model will also be initialized.

(Default= compatible with a low-standby-power model)

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

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Page 27

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

2.Blinking pattern when outdoor unit is abnormal:

OFF

No beep

Beeps

Repeated cycle

2.5-second OFF 3-second ON

Blinking at 0.5second interval

No beep Beeps

Repeated cycle

2.5-second OFF 3-second ON

Blinking at 0.5-

second interval

Repeated cycle

Does the left lamp of the OPERATION INDICATOR lamp on the indoor unit blink at the interval of 0.5 seconds? Blinks:

The outdoor unit is abnormal. Beep is emitted at the same timing as the blinking of the left lamp of the OPERATION INDICATOR lamp. 2

Yes (Blinks

)

No (OFF)

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

Operational procedure

Make sure that the remote controller is set to the failure mode recall function.

With the remote controller headed towards the indoor unit, press TEMP

button to adjust the set temperature to 25°C. 1

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

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

Releasing the failure mode recall function

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

Repair the failure parts.

The outdoor unit is normal.

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

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. 3 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 after it is 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.

The information regarding whether the

connected outdoor unit is a low-standby-

power model or a non-low-standby-power model will also be initialized.

(Default= compatible with a low-standby-

power model)

NOTE: It takes up to 1 minute to indicate the outdoor unit abnormality. Even if the OPERATION INDICATOR lamp is not lighting, keep

checking at least 1 minute or longer.

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Page 28

3. Outdoor unit failure mode table

Left lamp

of the

OPERATION

INDICATOR

lamp

(Indoor unit)

Abnormal point

(Failure mode/protection)

LED indication

(Outdoor P.C. board)

Condition Remedy

Indoor/outdoor

unit failure

mode recall

function

Outdoor unit failure mode

recall function

OFF None (Normal)

—— ———

1-time ﬂ ash

2.5 seconds OFF

Indoor/outdoor communication, receiving error

—

Any signals from the inverter P.C. board cannot be received normally for 3 minutes.

•Refer to 11-5.

How to check miswiring and serial signal error.

○○

Indoor/outdoor communication, receiving error

—

Although the inverter P.C. board sends signal "0", signal "1" has been received 30 consecutive times.

•Refer to 11-5.

How to check miswiring and serial signal error.

2-time ﬂ ash

2.5 seconds OFF

Outdoor power system

—

Overcurrent protection cut-out operates 3 consecutive times within 1 minute after the compressor gets started.

Reconnect the connectors. Refer to 11-5. "How to check inverter/ compressor". Check the stop valve.

•

○○

3-time ﬂ ash

2.5 seconds OFF

Discharge temperature thermistor

1-time ﬂ ash every

2.5 seconds

Thermistor shorts or opens during compressor running.

Refer to 11-5. "Check of outdoor thermistors". Defective the outdoor thermistors can be identiﬁ ed by checking the blinking pattern of LED.

•

○○

Defrost thermistor

Fin temperature thermistor 3-time ﬂ ash

2.5 seconds OFF

P.C. board temperature thermistor

4-time ﬂ ash

2.5 seconds OFF

Ambient temperature thermistor

2-time ﬂ ash

2.5 seconds OFF

Outdoor heat exchanger temperature thermistor

—

4-time ﬂ ash

2.5 seconds OFF

Overcurrent 11-time ﬂ ash

2.5 seconds OFF

Large current ﬂ ows into power module (IC700) (KJ25/35)/ IGBT module (IC700) (KJ50).

Reconnect the compressor connector. Refer to 11-5. "How to check inverter/ compressor". Check the stop valve.

•

—

○

Compressor synchronous abnormality (Compressor start-up failure protection)

12-time ﬂ ash

2.5 seconds OFF

Waveform of compressor current is distorted.

Reconnect the compressor connector. Refer to 11-5. "How to check inverter/ compressor".

•

• —

○

5-time ﬂ ash

2.5 seconds OFF

Discharge temperature

—

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.

Check the refrigerant circuit and the refrigerant amount. Refer to 11-5. "Check of LEV".

•

—

○

6-time ﬂ ash

2.5 seconds OFF

High pressure

—

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

Check the refrigerant circuit and the refrigerant amount. Check the stop valve.

•

—

○

7-time ﬂ ash

2.5 seconds OFF

Fin temperature/ P.C. board temperature

7-time ﬂ ash

2.5 seconds OFF

Temperature of ﬁ n temperature thermistor on the inverter P.C. board exceeds 75 ~ 86°C(KJ25/35)/ 75 ~ 80°C (KJ50), or temperature of P.C. board temperature thermistor on the inverter P.C. board exceeds 72 ~ 85°C (KJ25/35)/ 70 ~ 75°C (KJ50).

Check around the outdoor unit. Check the outdoor unit air passage. Refer to 11-5. "Check of outdoor fan motor".

•

—

○

8-time ﬂ ash

2.5 seconds OFF

Outdoor fan motor

—

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

Refer to 11-5.

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

•

—

○

9-time ﬂ ash

2.5 seconds OFF

Nonvolatile memory data 5-time ﬂ ash

2.5 seconds OFF

Nonvolatile memory data cannot be read properly.

Replace the inverter P.C. board.

•

○○

Power module (IC700) (KJ25/35) IGBT module (IC700) (KJ50).

6-time ﬂ ash

2.5 seconds OFF

The interface short circuit occurs in the output of the power module (IC700)(KJ25/35)/ IGBT module (IC700) (KJ50). The compressor winding shorts circuit.

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

•

10-time ﬂ ash

2.5 seconds OFF

Discharge temperature

—

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

Refer to 11-5. "Check of LEV". Check the refrigerant circuit and the refrigerant amount.

•

—

○

11-time ﬂ ash

2.5 seconds OFF

Bus-bar voltage (DC) 8-time ﬂ ash

2.5 seconds OFF

Bus-bar voltage of inverter cannot be detected normally.

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

•

—

○

Each phase current of compressor

9-time ﬂ ash

2.5 seconds OFF

Each phase current of compressor cannot be detected normally.

14-time ﬂ ash

2.5 seconds OFF

Stop valve (Closed valve) 14-time ﬂ ash

2.5 seconds OFF

Closed valve is detected by compressor current.

Check the stop valve.•

○○

4-way valve/ Pipe temperature

16-time ﬂ ash

2.5 seconds OFF

The 4-way valve does not work properly. The indoor coil thermistor detects an abnormal temperature.

Check the 4-way valve. Replace the inverter P.C. board.

•

NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (11-3.).

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Page 29

11-3. TROUBLESHOOTING CHECK TABLE

No. Symptom LED indication

Abnormal point/

Condition

Condition Remedy

Outdoor unit does not operate.

1-time ﬂ ash every

2.5 seconds

Outdoor power system

Overcurrent protection cut-out operates 3 consecutive times within 1 minute after the compressor gets started.

Reconnect the connector of the compressor. Refer to 11-5. "How to check inverter/compressor". Check the stop valve.

•

Outdoor thermistors Discharge temperature thermistor, ﬁ n temperature thermistor,

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

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

•

Outdoor control system

Nonvolatile memory data cannot be read properly.

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

Replace the inverter P.C. board. •

6-time ﬂ ash

2.5 seconds OFF

Serial signal The communication fails between the indoor and outdoor unit

for 3 minutes.

Check connection between the inverter P.C. board and the relay P.C. board. (KJ50) Refer to 11-5. "How to check miswiring and serial signal error.

•

11-time ﬂ ash

2.5 seconds OFF

Stop valve/ Closed valve

Closed valve is detected by compressor current.

Check the stop valve. •

14-time ﬂ ash

2.5 seconds OFF

Outdoor unit (Other abnormality)

Outdoor unit is defective.

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

•

16-time ﬂ ash

2.5 seconds OFF

4-way valve/

Pipe temperature

The 4-way valve does not work properly. The indoor coil thermistor detects an abnormal temperature.

Refer to 11-5. "Check of R.V. coil". Replace the inverter P.C. board.

•

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

2-time ﬂ ash

2.5 seconds OFF

Overcurrent protection

Large current ﬂ ows into power module (IC700)(KJ25/35)/ IGBT module (IC700) (KJ50).

Reconnect the connector of the compressor. Refer to 11-5. "How to check inverter/compressor". Check the stop valve.

•

3-time ﬂ ash

2.5 seconds OFF

Discharge temperature overheat protection

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.

Check the refrigerant circuit and the refrigerant amount. Refer to 11-5. "Check of LEV".

•

4-time ﬂ ash

2.5 seconds OFF

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

Temperature of ﬁ n temperature thermistor on the heat sink ex- ceeds 75 ~ 86°C (KJ25/35)/75 ~ 80°C(KJ50) or temperature of P.C. board temperature thermistor on the inverter P.C.board exceeds 72 ~ 85°C(KJ25/35)/70 ~ 75°C(KJ50).

Check around the outdoor unit. Check the outdoor unit air passage. Refer to 11-5. "Check of outdoor fan motor".

•

5-time ﬂ ash

2.5 seconds OFF

High pressure protection

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

Check the refrigerant circuit and the refrigerant amount. Check the stop valve.

•

8-time ﬂ ash

2.5 seconds OFF

Compressor synchronous abnormality

The waveform of compressor current is distorted.

Reconnect the connector of the compressor. Refer to 11-5. "How to check inverter/compressor".

•

10-time ﬂ ash

2.5 seconds OFF

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

after outdoor fan start-up.

Refer to 11-5.

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

•

12-time ﬂ ash

2.5 seconds OFF

Each phase current of compressor

Each phase current of compressor cannot be detected normally.

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

•

13-time ﬂ ash

2.5 seconds OFF

Bus-bar voltage (DC)

Bus-bar voltage of inverter cannot be detected normally. It occurs with following case.

Instantaneous power voltage drop. (Short time power failure) (KJ50) Refer to 11-5.

"Check of power

supply". (KJ50) Refer to 11-5. "How to check inverter/compressor".

•

Outdoor unit operates.

1-time ﬂ ash

2.5 seconds OFF

Frequency drop by current protection

KJ25/35 When the input current exceeds approximately

10A (KJ25)/10.5A (KJ35), compressor frequency lowers.

The unit is normal, but check the following. Check if the indoor ﬁ lters are clogged. Check if the refrigerant is short. Check if the indoor/outdoor unit air circulation is short cycled.

•

KJ50 Current from power outlet is nearing breaker ca-

pacity.

3-time ﬂ ash

2.5 seconds OFF

Frequency drop by high pressure protection

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

Frequency drop by defrosting in COOL mode

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

4-time ﬂ ash

2.5 seconds OFF

Frequency drop by discharge temperature protection

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

Check the refrigerant circuit and the refrigerant amount. Refer to 11-5.

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

•

5-time ﬂ ash

2.5 seconds OFF

Outside temperature thermistor protection

When the outside temperature thermistor shorts or opens, protective operation without that thermistor is performed.

Refer to 11-5. Check of outdoor thermistors.

•

OBH667B

Page 30

No. Symptom LED indication

Abnormal point/

Condition

Condition Remedy

Outdoor unit operates.

7-time ﬂ ash

2.5 seconds OFF

Low discharge temperature protection

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

Refer to 11-5. "Check of LEV". Check the refrigerant circuit and the refrigerant amount.

•

8-time ﬂ ash

2.5 seconds OFF

MUFZ-KJ25/35

PAM protection PAM: Pulse Amplitude Modulation

The overcurrent ﬂ ows into PFC (Power factor correction : IC820) or the bus-bar voltage reaches 394 V or more, PAM stops and restarts.

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.

MUFZ-KJ50

Zero cross detecting circuit

Zero cross signal cannot be detected. It occurs with following cases.

1 Instantaneous power voltage

drop. (Short time power failure)

2 Distortion of primary voltage Refer to 11-5. "Check of power supply".

•

9-time ﬂ ash

2.5 seconds OFF

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

mode starts.

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

•

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”.

OFF

2.5-second OFF

0.5-second ON

0.5-second ON LED

Flashing →

MUFZ-KJ50VE

LED

→

Flashing

MUFZ-KJ25/35VE

Inverter P.C. board

OBH667B

Page 31

11-4. TROUBLE CRITERION OF MAIN PARTS

MUFZ-KJ25VE MUFZ-KJ35VE

MUFZ-KJ50VE

Part name Check method and criterion Figure

Defrost thermistor (RT61)

Fin temperature thermistor (RT64)

Ambient temperature thermistor (RT65)

Outdoor heat exchanger temperature thermistor (RT68)

Measure the resistance with a tester.

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

Discharge temperature thermistor (RT62)

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”, for the chart of thermistor.

Compressor

Measure the resistance between terminals using a tester. (Temperature: -10 ~ 40°C)

Normal (Ω)

MUFZ-KJ25/35VE MUFZ-KJ50VE

U-V U-W V-W

1.66 ~ 2.26 0.87 ~ 1.18

Outdoor fan motor

Measure the resistance between lead wires using a tester. (Temperature: -10 ~ 40°C)

Color of lead wire

Normal (Ω)

MUFZ-KJ25/35VE MUFZ-KJ50VE

RED – BLK

BLK – WHT

WHT – RED

12 ~ 16 12 ~ 17

R. V. coil (21S4)

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

Normal (kΩ)

MUFZ-KJ25/35VE MUFZ-KJ50VE

1.41 ~ 2.00 1.19 ~ 1.78

Expansion valve coil (LEV)

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

Color of lead wire

Normal (Ω)

MUFZ-KJ25/35/50VE

RED – ORN

37 ~ 54

RED – WHT

RED – BLU

RED – YLW

RED

(+12V)

YLW

BLU

WHT

ORN

LEV

WHT

RED BLK

WHT

RED BLK

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Page 32

11-5. TROUBLESHOOTING FLOW

A How to check inverter/compressor

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

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

OK.

Yes

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

Replace the compressor.

Yes

B Check of open phase

C Check of compressor

● With the connector between the compressor and the power module (IC700)(MUFZ-KJ25/35)/ IGBT module (IC700)(MUFZ- KJ50) disconnected, activate the inverter and check if the inverter is normal by measuring the voltage balance 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.

Are the voltages balanced?

Disconnect the connector between the compressor and the power module (IC700)(MUFZ-KJ25/35)/ IGBT module (IC700)(MUFZ-KJ50).

Replace the inverter P.C. board.

Check the voltage between terminals.

Check the compressor.

See 11-5. “Check of compressor”.

Yes

See 11-5. “Check of open phase”.

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Page 33

F Check of compressor start failure

D Check of compressor winding

E Check of compressor operation time

● Disconnect the connector between the compressor and the power module (IC700)(MUFZ-KJ25/35)/ IGBT module (IC700)(MUFZ-KJ50), and measure the resistance between the compressor terminals.

<<Measurement point>> At 3 points BLK-WHT BLK-RED WHT-RED <<Judgement>> Refer to 11-4. 0 [Ω] ················Abnormal [short] Infinite [Ω] ·······Abnormal [open] NOTE: Be sure to zero the ohmmeter before measurement.

Measure the resistance between the lead wires at 3 points.

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

Heating part

● 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.

Compressor starts

Abnormal (IC700 failure) (Compressor winding short)

Abnormal (Compressor lock out) (Starting defect)

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

Abnormal (Refrigerant circuit defect) (Closed valve)

Normal

0 second

1 second

2 seconds

10 seconds

10 minutes

<<Judgement>>

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

Replace the compressor.

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

Yes

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

Check the refrigerant circuit. Check the stop valve.

Yes

Conﬁ rm that ~ is normal.

•Electrical circuit check . Contact of the compressor connector . Output voltage of inverter P.C. board and balance of them (See 11-5. ) . Direct current voltage between DB61(+) and (-)(MUFZ-KJ25/35)/ JP715(+)

and JP30(-)(MUFZ-KJ50)on the inverter P.C. board

. Voltage between outdoor terminal block S1-S2

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Page 34

G Check of outdoor thermistors

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

Replace the inverter P.C. board.

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

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?

OK. (Cause is poor contact.)

Yes

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

MUFZ-KJ25/35

Thermistor Symbol Connector, Pin No. Board

Defrost RT61 Between CN641 pin1 and pin2

Inverter P.C. board

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

MUFZ-KJ50

Thermistor Symbol Connector, Pin No. Board

Defrost RT61 Between CN671 pin1 and pin2

Inverter P.C. board

Discharge temperature RT62 Between CN671 pin3 and pin4 Fin temperature RT64 Between CN673 pin1 and pin2 Ambient temperature RT65 Between CN672 pin1 and pin2 Outdoor heat exchanger temperature RT68 Between CN671 pin5 and pin6

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Page 35

H Check of R.V. coil

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 disconnected or R.V. coil is open, voltage is generated between the terminal pins of the connector

although no signal is being transmitted to R.V. coil.

Check if CN721 is connected.

Is there 230 VAC between CN721 and

on the inverter P.C. board 3 minutes

after the power supply is turned ON?

Yes

Replace the inverter P.C. board.

Replace the 4-way valve.

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

Is there 230 VAC between CN721 and

on the inverter P.C. board 3 minutes

after the power supply is turned ON?

Yes

Replace the inverter P.C. board.

Replace the 4-way valve.

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

Disconnect connector between the compressor and the power module (IC700). Turn ON the power supply and press EMERGENCY OPERATION switch twice (HEAT mode).

Disconnect connector between the compressor and the power module (IC700). Turn ON the power supply and press EMERGENCY OPERATION switch once (COOL mode).

First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 11-4. In case CN602 is disconnected or R.V. coil is open, voltage is generated between the terminal pins of the connector

although no signal is being transmitted to R.V. coil.

Check if CN602 is connected.

Is there 230 VAC between CN602 and

on the inverter P.C. board 3 minutes

after the power supply is turned ON?

Yes

Replace the inverter P.C. board.

Replace the 4-way valve.

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

Is there 230 VAC between CN602 and

on the inverter P.C. board 3 minutes

after the power supply is turned ON?

Yes

Replace the inverter P.C. board.

Replace the 4-way valve.

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

Disconnect connector between the compressor and the IGBT module (IC700). Turn ON the power supply and press EMERGENCY OPERATION switch twice (HEAT mode).

Disconnect connector between the compressor and the IGBT module (IC700). Turn ON the power supply and press EMERGENCY OPERATION switch once (COOL mode).

MUFZ-KJ25/35

MUFZ-KJ50

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Page 36

I Check of outdoor fan motor

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

Disconnect CN932 from the inverter P.C. board, and turn on the power supply.

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

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

Does the outdoor fan motor rotate smoothly?

Replace the outdoor fan motor.

Replace the inverter P.C. board.

Yes

(Fixed to either 5 or 0 VDC)

Yes

Disconnect the connectors CN931 and CN932 from the inverter P.C. board. Check the connection between the connector CN931 and CN932.

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Page 37

J Check of power supply

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

Yes

Replace the indoor electronic control P.C. board.

Rectify indoor/outdoor connecting wire.

Yes

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

Does POWER lamp on the indoor unit light up?

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

Replace the inverter P.C. board.

Is there bus-bar voltage 260 - 370 VDC between DB61 (+) and DB61 (–) (MUFZ-KJ25/35)/325 - 370 VDC between JP715 (+) and JP30 (–) (MUFZ-KJ50) on the inverter P.C. board? (Refer to 11-6.1.)

Check the electric parts in main circuit.

Yes

Disconnect the connector between the compressor and the power module (IC700) (MUFZ-KJ25/35)/IGBT module (IC700) (MUFZ-KJ50). Turn ON power supply and press EMERGENCY OPERATION switch.

Inverter P.C. board (Solder side)

DB61

260 - 370 VDC

MUFZ-KJ25/35

325 -370 VDC

JP30

JP715

MUFZ-KJ50

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Page 38

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

Expansion valve operates in full-opening direction.

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

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

2. Press RESET button on the remote controller.

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

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

Properly ﬁ x the LEV coil to the expansion valve.

Replace the inverter P.C. board.

Replace the LEV coil.

Replace the expansion valve.

Is LEV coil properly ﬁ xed to the expansion valve?

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

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

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

While pressing both OPERATION SELECT (MODE) button and TEMP button on the remote controller at the same time, press RESET button. First, release RESET button.

Hold down the other two buttons for another 3 sec-

onds. Make sure that the indicators on the LCD screen shown in the right ﬁ gure are all displayed. Then re- lease the buttons.

Yes

K Check of LEV (Expansion valve)

AMPM AM PM

OBH667B

Page 39

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 (CN931, 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?

Replace the inverter P.C. board.

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

Yes

Yes (10-time ﬂ ash)

L Check of inverter P.C. board

OBH667B

Page 40

How to check miswiring and serial signal error

Turn OFF inverter-controlled lighting equipment. Turn OFF the power supply and then turn it ON again. Press EMERGENCY OPERATION switch.

•

Is serial signal error indicated 6 minutes later?

Yes

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

•

Turn OFF the power supply.

Is there rated voltage in the power supply?

Yes

Turn ON the power supply.

Check the power supply.

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

Yes

Check the wiring.

Press EMERGENCY OPERATION switch once.

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

Yes

Correct the wiring.

Is the serial signal error indicated 6 minutes later?

Yes

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

Yes

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

Yes

Check for miswiring, broken wires, and loose wire connection between the power supply and outdoor terminal block S1 and between the power supply and outdoor terminal block S2.

Wait for 2 or more minutes after the power supply is turned on. Touch S2 and S3 with tester probes and start the emergency operation.

Turn the power supply ON.

When the emergency operation starts, does the rated voltage occur for 2 seconds between indoor terminal block S2 and S3?

Yes

Replace the indoor electronic control P.C. board.

Does the left lamp of the OPERATION INDICATOR lamp on the indoor unit blink continuously 6 minutes after the emergency operation starts?

Does the outdoor LED light up?

Yes

Does the outdoor LED blink 6 times?

Yes

Conﬁ rm that the thermostat is OFF and wiring is not loose.

Does DC (6V or more) occur between indoor terminal block S2 and S3?

Yes

Replace the outdoor inverter P.C. board. 1

Turn the power supply OFF. Replace the indoor electronic control P.C. board.

1. Electric charge may remain immediately after the power supply is turned OFF. Perform the procedure after 3 minutes.

Replace the outdoor inverter P.C. board. 1

Yes

MUFZ-KJ25/35

Was the indoor unit ever connected to the Multi (MXZ) series and operated (turned on)?

The connection information to the Multi series is stored in the indoor unit. Refer to “Deleting the memorized abnormal condition” described in 11-2.1 to clear the error history. When the error history is being cleared, the connection information also will be initialized. The indoor unit will be compatible with a low-standby-power model after initialization.

Yes

MFZ-KJ25/35VE-

E2,ER2

OBH667B

Page 41

MUFZ-KJ50

Turn the power supply OFF.

Is there rated voltage in the power supply?

Yes

Check for incorrect indoor-outdoor connecting wiring.

Check the power supply.

Turn OFF inverter-controlled lighting equipment. Turn OFF the power supply and then turn ON again. Press EMERGENCY OPERATION switch.

•

Is serial signal error indicated 6 minutes later?

Yes

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

•

NOTE: Refer to the indoor unit service manual.

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

Check for miswiring, broken wires, and loose wire connection between the power supply and outdoor terminal block S1 and between the power supply and

outdoor terminal block S2. Wait for 2 or more minutes after the power supply is turned on. Touch S2 and S3 with tester probes and start the emergency operation.

When the emergency operation starts, does the rated voltage occur for 2 seconds between indoor terminal block S2 and S3?

Yes

Replace the indoor electronic control P.C. board.

Does the left lamp of the OPERATION INDICATOR lamp on the indoor unit blink continuously 6 minutes after the emergency operation starts?

Does DC (10 V or more) occur between L68A and L68B on the outdoor relay P.C. board?

Yes

Does the outdoor LED blink 6 times?

Yes

Replace the outdoor relay P.C. board.

Does DC (more than 0 V) occur between indoor terminal block S2 and S3?

Yes

Replace the outdoor inverter P.C. board.

Turn the power supply OFF.

Start the emergency operation.

Repair has been completed.

Replace the outdoor inverter P.C. board and the outdoor relay P.C. board. 1

1. Electric charge may remain immediately after the power supply is turned OFF. Perform the procedure after 3 minutes.

Replace the outdoor inverter P.C. board and the outdoor relay P.C. board. 1

Turn the power supply ON.

Does the left lamp of the OPERATION INDICATOR lamp on the indoor unit blink continuously 6 minutes after the emergency operation starts?

Yes

Replace the indoor electronic control P.C. board.

Yes

Replace the outdoor inverter P.C. board and the outdoor relay P.C. board. 1

Yes

B Turn the power supply ON.

Was the indoor unit ever connected to the Multi (MXZ) series and operated (turned on)?

Yes

OBH667B

Page 42

N Electromagnetic noise enters into TV sets or radios

Yes

Is the unit earthed?

Earth the unit.

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?

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

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?

Yes

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

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

Yes

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

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

Yes

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.

OBH667B

Page 43

-20 -10 0 10 20 30 40

100

Temperature( )

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

Temperature( )

Discharge temperature thermistor(RT62)

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

100

200

300

400

500

600

700

0 1020304050607080

100

120

140

160

180

200

Temperature( )

Fin temperature thermistor(RT64)

Resistance(k )

1. Inverter P.C. board

MUFZ-KJ25VE MUFZ-KJ35VE

11-6. TEST POINT DIAGRAM AND VOLTAGE

Fin temperature

thermistor/RT64

(CN642)

Ambient temperature

thermistor/RT65

(CN643)

Discharge temperature

thermistor/RT62

(CN641)

Defrost thermistor

/RT61(CN641)

DB61 260 - 370 VDC

Front side of unit

230 VAC

Smoothing capacitor (C62)

Output to drive compressor (LDU, LDV, LDW)

(+)

(-)

Fuse (F701) T3.15AL250V

Smoothing capacitor (C61)

Fuse (F901) T3.15AL250V

R.V.coil (CN721) 230 VAC

Jumper wire for changing defrost setting (JS)

Signal of outdoor

fan motor (CN931)

230 VAC

Outdoor heat exchanger

temperature thermistor

/RT68 (CN644)

Jumper wire for pre-heat control setting (JK)

Fuse (F801) T3.15AL250V

Back side of unit

LEV connector

(CN724)

Output to drive outdoor fan motor (CN932)

LED

OBH667B

Page 44

MUFZ-KJ50VE

-20 -10 0 10 20 30 40

100

Temperature( )

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

Temperature( )

Discharge temperature thermistor(RT62)

0 102030405060708090100110120

100

200

300

400

500

600

700

0 1020304050607080

100

120

140

160

180

200

Temperature( )

Fin temperature thermistor(RT64)

Resistance(k )

Fin temperature thermistor/RT64 (CN673)

Ambient temperature thermistor/RT65 (CN672)

Discharge temperature thermistor/RT62 (CN671)

Defrost thermistor /RT61 (CN671)

Output to drive outdoor fan motor (CN932)

Outdoor heat exchanger temperature thermistor /RT68 (CN671)

Fuse (F901) T3.15AL250V

Fuse (F880) T3.15AL250V

LEV connector (CN724)

Jumper wire for changing defrost setting (JS)

Jumper wire for pre-heat control setting (JK)

Fuse (F601) T3.15AL250V

Signal of outdoor fan motor (CN931)

R.V. coil (CN602) 230VAC

325 - 370 VDC

JP715 (+)

JP30 (-)

LED

Heater (CN601) 230VAC

To relay P.C. board CN680 (CN681)

OBH667B

Page 45

2. Relay P.C. board

MUFZ-KJ50VE

To inverter P.C. board CN681 (CN680)

CN60

L68B(-)

L68A(+)

10 VDC

OBH667B

Page 46

12-1. MUFZ-KJ25VE MUFZ-KJ35VE

NOTE: Turn OFF power supply before disassembly.

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.

Photo 1

Photo 2

(1) Slide the sleeve and check if there is a locking lever or not. (2) The terminal with this connector has the

locking mechanism.

Slide the sleeve. Pull the terminal while pushing the locking lever.

Hold the sleeve, and pull out the terminal slowly.

Connector

Sleeve

Locking lever

Back panel

Service

panel

Screws of the top panel

Screws of the cabinet

Screws of the top panel

Screw of the service panel

Direction to remove

Screws of the cabinet

Hooks

<"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.

DISASSEMBLY INSTRUCTIONS

Screw of the

cabinet

Screws of the back panel

Screws of the terminal block support and the back panel

OBH667B

Page 47

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:

CN721 (R.V. coil) CN931, 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 heat sink support and the sep-

arator.

(5) Remove the fixing screws of the terminal block support and

the back panel.

(6) Remove the inverter assembly. (7) Remove the screw of the earth wire and screw of the termi-

nal block support.

(8) Remove the heat sink support from the P.C. board support. (9) Remove the screw of the inverter P.C. board and remove the

inverter P.C. board from the P.C. board support.

Photo 3

Photo 4 (Inverter assembly)

Photo 5

3. Removing R.V. coil

(1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the following connectors: <Inverter P.C. board>

CN721 (R.V. coil)

(3) Remove the R.V. coil.

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

(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> CN641 (Defrost thermistor and discharge temperature ther-

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

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

from its holder. (Photo 6)

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

Discharge temperature thermistor

Screw of the R.V. coil

Heat sink

Screw of the earth wire

Screw of the

Terminal block support

Screw of the inverter P.C. board

Heat sink support

P.C. board support

Terminal block support

Screws of the heat sink support and the separator

Screws of the terminal block support and the back panel

OBH667B

Page 48

OPERATING PROCEDURE

PHOTOS

5. Removing outdoor fan motor

(1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the following connectors: <Inverter P.C. board>

CN931, CN932 (Fan motor) (3) Remove the propeller nut. (4) Remove the propeller. (5) Remove the screws fixing the fan motor. (6) Remove the fan motor.

Photo 6

Photo 7

Photo 8

6. Removing the compressor and 4-way valve

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

NOTE: Recover gas from the pipes until the pressure gauge

shows 0 kg/cm2 (0 MPa).

(4) Detach the brazed 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 brazed part of pipes connected with 4-way valve.

Propeller nut

Screws of the outdoor fan motor

Propeller

Photo 9

Brazed parts of 4-way valve

Suction pipe brazed part

Discharge pipe brazed part

Defrost thermistor

Outdoor heat exchanger temperature thermistor

Ambient temperature thermistor

OBH667B

Page 49

12-2. MUFZ-KJ50VE

NOTE: Turn OFF power supply before disassembly.

OPERATING PROCEDURE

PHOTOS

1. Removing the cabinet

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

Photo 2

Photo 1

Screws of the cabinet

Screws of the top panel

Screws of the cabinet

Screws of the top panel

Screw of the back panel

Screws of the cabinet

Screws of the service panel

Screw of the valve cover

Screws of the cabinet

Screws of the back panel

OBH667B

Page 50

OPERATING PROCEDURE

PHOTOS

2. Removing the inverter assembly, inverter P.C. board and relay 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> CN602 (R.V. coil) CN931, CN932 (Fan motor) CN671 (Defrost thermistor, discharge temperature thermistor

and outdoor heat exchanger temperature thermistor) CN672 (Ambient temperature thermistor) CN724 (LEV)

(3) Remove the compressor connector. (4) Remove the screws fixing the relay panel. (5) Remove the relay panel. (6) Remove the earth wires and the lead wires of the inverter P.C.

board. (7) Remove the screws of the P.B. support. (8) Remove the inverter P.C. board from the relay panel. (9) Disconnect the following connectors:

<Relay P.C. board> CN60 (Terminal block) CN680 (Inverter P.C. board) TAB65 (Inverter P.C. board) TB71

(10)

Remove the screws fixing the P.B. holder.

(11)

Remove the relay P.C. board from the P.B. holder.

Photo 3

Photo 4

3. Removing R.V. coil

(1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the following connector: <Inverter P.C. board>

CN602 (R.V. coil)

(3) Remove the R.V. coil.

Screws of the P.B. support

Screws of the relay panel

Inverter P.C. board

Earth wires

Screw of the P.B. holder

Screws of the P.B. support

Brazed parts of 4-way valve

Screw of the R.V. coil

Screw of the relay panel

Relay P.C board

OBH667B

Page 51

OPERATING PROCEDURE PHOTOS

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

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

connectors: <Inverter P.C. board>

CN671 (Defrost thermistor, discharge temperature thermis-

tor and outdoor heart exchanger temperature thermistor)

CN672 (Ambient temperature thermistor)

(3) Pull out the discharge temperature thermistor from its hold-

er. (Photo 7) (4) Pull out the defrost thermistor from its holder. (5) Pull out the outdoor heat exchanger temperature thermistor

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

Photo 5

Photo 6

Photo 7

5. Removing outdoor fan motor

(1)

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

(2) Disconnect the following connectors:

CN931 and CN932 (Fan motor)

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

6. 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 kg/cm2 (0 MPa).

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

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

Screws of the outdoor fan motor

Outdoor heat exchanger temperature thermistor

Ambient temperature thermistor

Defrost thermistor

Brazed part of the discharge pipe

Brazed part of the suction pipe

Discharge temperature

thermistor

OBH667B

Page 52

© Copyright 2013 MITSUBISHI ELECTRIC CORPORATION Distributed in Jan. 2014. No. OBH667 REVISED EDITION-B Distributed in Oct. 2013. No. OBH667 REVISED EDITION-A Distributed in Jun. 2013. No. OBH667 Made in Japan

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

New publication, effective Jan. 2014 Specifications are subject to change without notice.

Mitsubishi Electric MUFZ-KJ25VE-E1, MUFZ-KJ25VE-ER1, MUFZ-KJ35VE-E1, MUFZ-KJ35VE-ER1, MUFZ-KJ50VE-E1 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual