Mitsubishi OB453 Service Manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

HFC

utilized

R410A

OUTDOOR UNIT

SERVICE MANUAL

Wireless type
Models

No. OB453

MUZ-HA25VA ­MUZ-HA35VA -

E1

E1

Indoor unit service manual
MSZ-HA•VA Series (OB452)

CONTENTS

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

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················9

8. PERFORMANCE CURVES······························11

9. ACTUA TOR CONTROL····································19

10. SERVICE FUNCTIONS·····································20

11. TROUBLESHOOTING ······································20

12. DISASSEMBLY INSTRUCTIONS·····················35

13. PARTS LIST······················································38

14. RoHS PARTS LIST···········································42

NOTE:

This service manual describes technical data of the outdoor units.
RoHS compliant products have <G> mark on the spec name plate.
For servicing of RoHS compliant products , refer to the RoHS Parts List.

1

TECHNICAL CHANGES

MUZ-GA25VA - ➔ MUZ-HA25VA -

MUZ-GA35VA - ➔ MUZ-HA35VA -

1.Inverter P.C. board has been changed.

2.Refrigerant circuit has been changed.

• Capillary tube has been changed.

• Capillary tube for heating correction has been added.

• Bypass ciruit for low outside temperature cooling has been removed. (MUZ-HA25)

• Muffler has been removed. (MUZ-HA35)

• 4-way valve and R.V. coil have been changed. (MUZ-HA35)

• Stop valve has been changed. (MUZ-HA35)

3.Condenser has been changed.

4.Power P.C. board has been changed. (MUZ-HA35)

5.Front panel has been changed. (MUZ-HA25)

6.Base has been changed. (MUZ-HA25)

7.Condenser net has been changed. (MUZ-HA25)

8.Fan motor has been changed. (DC➔AC) (MUZ-HA35)

9.Material of propeller has been changed. (MUZ-HA35)

E1E2
E1E2

2

1

Drain socket

1

MUZ GA25VA

E1

MUZ-GA35VA -

E1

2

PART NAMES AND FUNCTIONS

MUZ-HA25VA
MUZ-HA35VA

Air inlet
(back : MUZ-HA25)
(back and side : MUZ-HA35)

Piping

Drain hose

Air outlet

Drain outlet

ACCESSORIES

3

Single phase

230V,50Hz

1,854

10

4.2

0.24

KNB065FDTH

500

V-W 1.88

800o550o285

31
46

795

1

0.70

320 (NEO22)

Cooling

2.5 (0.9-3.0)

1.4

3.7

785

92

3.24

3.18

U-V 1.88

Heating

3.2 (0.9-4.4)
—

4.2

945

98

3.74

3.39

U-W 1.88

MUZ-HA25VA

Single phase

230V,50Hz

1,920

10

4.8

0.24

KNB073FDVH

550

V-W 1.53

800o550o285

33

795

1

0.80

320 (NEO22)

Cooling

3.15 (1.0-3.7)

2.0

4.8

1,045

95

4.34

3.01

U-V 1.53

47

Heating

3.6 (0.9-4.8)
—

4.8

1,070

97

4.34

3.36

U-W 1.53

48

Outdoor model

Function

Power supply

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

(Total)

Power input ✽1

(Total)

Power factor ✽1

(Total)

Starting current ✽1

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

Model
Output
Winding
resistance(at 20:)
Model

Winding
resistance(at 20:)

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

kW

r/h

K /h

A

A
W
%

A

A

A

✽1

(Total)

W

"

"

mm

kg

dB(A)

rpm

kg
cc

Compressor

Fan

motor

Special

remarks

Coefficient of performance(C.O.P)

Capacity

Electrical

data

MUZ-HA35VA

RA6V21-AB or BB

WHT-BLK 347 or 252
BLK-RED 281 or 278

3

SPECIFICATION

NOTE : Test conditions are based on ISO 5151

Cooling : Indoor Dry-bulb temperature 27:Wet-bulb temperature 19:
Heating : Indoor Dry-bulb temperature 20:Wet-bulb temperature 15:
Refrigerant piping length (one way): 5m

✽1 Measured under rated operating frequency

Outdoor Dry-bulb temperature 35:Wet-bulb temperature(24:)
Outdoor Dry-bulb temperature 7: Wet-bulb temperature 6:

4

Specifications and rating conditions of main electric parts

Current transformer
Current transformer
Smoothing capacitor
Diode module
Fuse
Fuse
Intelligent power module
Reactor
Current-detecting resistor
Current-detecting resistor
Current-limiting resistor
Terminal block
Relay
Relay
R.V. coil
Solid state relay
Outdoor fan motor thermal fuse

(CT761, CT781)

(C63B, C63C)
(DB61, DB65)

(CT)

(F61)

(F71, F801)

(IPM)
(L61)

(R61)

(R831)

(R64A, R64B)

(TB1,TB2)

(X63)
(X64)

(21S4)

(SR61)

ETA19Z59BZ

ETQ19Z71AY

620+ 420V

D25XB60
250V 20A

250V 3.15A

PS21244-A-203

10A 23.0mH

45m" 5W (1 element)

25m" 5W

10" 5W

3P

G5NB-1a

G4A-1A-PS

SHF-4-10W5

G3MC-202PL

Open 152: (RA6V21-AB) or Open 130: (RA6V21-BB)

5

4

90

80

70

60

50

40

30

20

10

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

Test conditions,
Cooling : Dry-bulb temperature 35: Wet-bulb temperature (24:)

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

COOLING

FUNCTION

SPL(dB(A)) LINE

HEATING

46

46

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

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

COOLING

FUNCTION

SPL(dB(A))

LINE

HEATING

47
48

Test conditions,
Cooling : Dry-bulb temperature 35: Wet-bulb temperature (24:)

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

OUTDOORUNIT

MICROPHONE

1m

NOISE CRITERIA CURVES

MUZ-HA25VA

MUZ-HA35VA

6

5

10

69

800

302.5
500 Bolt pitch for installation

150

22.3

Handle

550

280

164.5

99.5

170.5

23

Service panel

Service port

285

344.5

44

400

Air in

Air out

Air in

(MUZ-HA35)

17.5

Bolt pitch for

installation

304~325

40

Liquid refrigerant pipe joint
Refrigerant pipe (flared) [6.35

Gas refrigerant pipe joint
Refrigerant pipe (flared) [9.52

43-

35-

2 holes 10X21

REQUIRED SPACE

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

350m

m

or m

ore

200m

m

or m

ore

100m

m

or m

ore

(M

UZ-HA35)

100mm or more

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

Drain hole [42

OUTLINES AND DIMENSIONS

MUZ-HA25VA
MUZ-HA35VA

Unit: mm

7

6

SYMBOL

CT,CT761,CT781

C63B,C63C

C65

DB61,DB65

DSA61

F61

F71,F801

IC801

IPM

SYMBOL

L61

L62,L63MCMF

NR63,NR64

RT61

RT62

RT64

R61,R831

SYMBOL

R64A,R64B

SR61

TB1,TB2

TR821

T801

X63,X64

21S4

NAME

CURRENT TRANSFORMER

SMOOTHING CAPACITOR

FAN MOTOR CAPACITOR

DIODE MODULE

SURGE ABSORBER

FUSE (T20AL250V)

FUSE (T3.15AL250V)

INTELLIGENT POWER DEVICE

INTELLIGENT POWER MODULE

NAME

REACTOR

CMC COIL

COMPRESSOR

FAN MOTOR(INNER FUSE)

VARISTOR

DEFROST THERMISTOR

DISCHARGE TEMP. THERMISTOR

FIN TEMP. THERMISTOR

CURRENT-DETECTING RESISTOR

NAME

CURRENT-LIMITING RESISTOR

SOLID STATE RELAY

TERMINAL BLOCK

SWITCHING POWER TRANSISTOR

TRANSFORMER

RELAY

REVERSING VALVE COIL

WIRING DIAGRAM

MUZ-HA25VA
MUZ-HA35VA

the indoor unit electric wiring diagram for

servicing.

2.Use copper conductors only. (For field wiring)

3. Symbols below indicate.

/: Terminal block, : Connector

NOTE:1. About the indoor side electric wiring refer to

8

7

Outdoor
heat
exchanger

Flared connection

Defrost
thermistor
RT61

Discharge
temperatuer
thermistor
RT62

Flared connection

Stop valve
(with strainar)

Stop valve
(with service port)

Refrigerant flow in cooling

Compressor

Muffler

Muffler

4-way valve

Refrigerant flow in heating

Refrigerant pipe [9.52
(with heat insulator)

Refrigerant pipe [6.35
(with heat insulator)

R.V. coil
heating ON
cooling OFF

Strainer

Capillary tube
[3.0 o [1.4o [800 (MUZ-HA25)
[3.0 o [1.4o [500 (MUZ-HA35)

Check
valve

Capillary tube
[3.0 o [1.4o [235

REFRIGERANT SYSTEM DIAGRAM

MUZ-HA25VA
MUZ-HA35VA

Unit:mm

9

Outdoor unit

precharged

14m

270

7m

0

6m

0

5m

0

11m

180

Model

Refrigerant piping length (one way)

8m

90

9m

120

10m

150

12m

210

13m

240

15m

300

20m

450

700
800

MUZ-HA25VA
MUZ-HA35VA

Max. length
A

Max. Height

difference

B

Indoor
unit

Outdoor unit

MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE

Max. length

A

10

Max. Height difference

B

5

Model

Gas

9.52

Liquid

6.35

Piping size O.D : mm

Refrigerant piping : m

MUZ-HA25VA
MUZ-HA35VA

ADDITIONAL REFRIGERANT CHARGE (R410A:g)

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

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

10

PERFORMANCE CURVES8

MUZ-HA25VA MUZ-HA35VA

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

(1) GUARANTEED VOLTAGE

207 ~ 253V, 50Hz

(2) AIR FLOW

Air flow should be set at MAX.

(3) MAIN READINGS

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

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

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

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

3. Check that the air filter is cleaned.

4. Open windows and doors of room.

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

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

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

}

}

Cooling

Heating

INDOOR UNIT

Wet and dry-bulb
thermometers

8-1. Capacity and input curves

6.4

5.9

5.4

4.9

4.4

difference (degree)

3.9

Indoor air Wet-bulb temperature

8.4

7.7

7.0

6.4

5.7

5.1

OUTDOOR UNIT

Wet and dry-bulb
thermometers

In

d

o

o

r in

ta

k

e

a

ir W

e

t-b

u

lb

te

m

p

e

ra

tu

re

(

:

)

Indoor intake air W

et-bulb tem

perature (

)

:

MUZ-HA25VA

MUZ-HA35VA

at Rated frequency

Outdoor intake air Dry-bulb temperature (:)

at Rated frequency

Outdoor intake air Dry-bulb temperature (:)

11

Correction of Cooling total input

Input correction factors

The operational frequency of compressor

Correction of Cooling capacity

Capacity correction factors

The operational frequency of compressor

Correction of Cooling capacity

Capacity correction factors

The operational frequency of compressor

Correction of Cooling total input

Input correction factors

The operational frequency of compressor

Correction of Heating total input

The operational frequency of compressor

Correction of Heating capacity

Capacity correction factors

The operational frequency of compressor

Correction of Heating total input

Input correction factors

The operational frequency of compressor

Correction of Heating capacity

Capacity correction factors

The operational frequency of compressor

Input correction factors

MUZ-HA25VA

MUZ-GA25VA
MUZ-GA25VAH

MUZ-GA25VA
MUZ-GA25VAH

MUZ-GA25VA
MUZ-GA25VAH

MUZ-HA35VA

MUZ-GA35VA
MUZ-GA35VAH

MUZ-GA35VA
MUZ-GA35VAH

MUZ-GA35VA
MUZ-GA35VAH

0 50 100 150(Hz)

0.0

0.5

1.0

1.5

0 50 100 150(Hz)

0.0

0.5

1.0

1.5

0 50 100 150(Hz)

0.0

0.5

1.0

1.5

2.0

0 50 100 150(Hz)

0.0

0.5

1.0

1.5

2.0

0 50 100 150(Hz)

0.0

0.5

1.0

1.5

0 50 100 150(Hz)

0.0

0.5

1.0

1.5

0 50 100 150(Hz)

0.0

0.5

1.0

1.5

2.0

0 50 100 150(Hz)

0.0

0.5

1.0

1.5

2.0

20.5

18.9

17.4

15.8

14.2

12.6

11.0

9.5

23.1

21.3

19.5

17.8

16.0

14.2

12.4

10.7

Indoor air Dry-bulb temperature

difference (degree)

In

d

o

o

r

in

ta

k

e

a

ir

D

r

y

-b

u

lb

te

m

p

e

r

a

tu

r

e

(

:

)

Outdoor intake air Wet-bulb temperature (:)

Outdoor intake air Wet-bulb temperature (:)

In

d

o

o

r

in

ta

k

e

a

ir

D

r

y

-b

u

lb

te

m

p

e

r

a

tu

re

(

:

)

at Rated frequency

at Rated frequency

MUZ-HA35VA

MUZ-HA25VA

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

defrost operation.

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

8-3. Test run operation (How to operate fixed-frequency operation)

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

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

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

4. Indoor fan operates at High speed.

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

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

varies).
remote controller.

12

8-4. Outdoor low pressure and outdoor unit current

Dry bulb temperature (°C)

Indoor

20.0

14.521

Outdoor
7
6

151220.0

14.5

Wet bulb temperature (°C)

COOL operation

1 Both indoor and outdoor unit are under the

same temperature/humidity condition.

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

MUZ-HA25VA

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

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

1.4

14

1.2

12

1.0

10

0.8

8

0.6

6

Outdoor low pressure

0.4

4
2

0.2
18

Ambient temperature(˚C)
Ambient humidity(%)

MUZ-HA35VA

1.4

14

1.2

12

1.0

10

0.8

8

0.6

6

Outdoor low pressure

0.4

4
2

0.2
18

Ambient temperature(˚C)
Ambient humidity(%)

Outdoor unit current(A)

3215 2050256030

35(˚C) 3230

70 (%)

Outdoor unit current(A)

3215 2050256030

35(˚C) 3230

70 (%)

Dry-bulb temperature(:)

MUZ-HA25VA

4

3.5

3

2.5

2

15 205025

18

Ambient temperature(˚C)
Ambient humidity(%)

60

MUZ-HA35VA

6

5

4

3

2

15 205025

18

Ambient temperature(˚C)
Ambient humidity(%)

60

20
25
30 70

35(˚C)

70 (%)

35(˚C)

70 (%)

Relative humidity(%)

50
60

HEAT operation

1 Condition :

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

MUZ-HA25VA MUZ-HA35VA

3.0

2.5

2.0

1.5

1.0

0.5

Outdoor unit current (A)

0.0
2

5 10 15 20 25(:)

Ambient temperature(˚C)

4.0

3.5

3.0

2.5

2.0

1.5

Outdoor unit current (A)

1.0
2

5 10 15 20 25(:)

Ambient temperature(˚C)

13

21 18 2.94 1.79 0.61 628 2.81 1.72 0.61 659 2.70 1.65 0.61 691 2.60 1.59 0.61 722
21 20 3.06 1.50 0.49 659 2.94 1.44 0.49 699 2.85 1.40 0.49 714 2.75 1.35 0.49 746
22 18 2.94 1.91 0.65 628 2.81 1.83 0.65 659 2.70 1.76 0.65 691 2.60 1.69 0.65 722
22 20 3.06 1.62 0.53 659 2.94 1.56 0.53 699 2.85 1.51 0.53 714 2.75 1.46 0.53 746
22 22 3.19 1.31 0.41 683 3.08 1.26 0.41 726 3.00 1.23 0.41 746 2.88 1.18 0.41 777
23 18 2.94 2.03 0.69 628 2.81 1.94 0.69 659 2.70 1.86 0.69 691 2.60 1.79 0.69 722
23 20 3.06 1.75 0.57 659 2.94 1.67 0.57 699 2.85 1.62 0.57 714 2.75 1.57 0.57 746
23 22 3.19 1.43 0.45 683 3.08 1.38 0.45 726 3.00 1.35 0.45 746 2.88 1.29 0.45 777
24 18 2.94 2.14 0.73 628 2.81 2.05 0.73 659 2.70 1.97 0.73 691 2.60 1.90 0.73 722
24 20 3.06 1.87 0.61 659 2.94 1.79 0.61 699 2.85 1.74 0.61 714 2.75 1.68 0.61 746
24 22 3.19 1.56 0.49 683 3.08 1.51 0.49 726 3.00 1.47 0.49 746 2.88 1.41 0.49 777
24 24 3.35 1.24 0.37 714 3.23 1.19 0.37 754 3.15 1.17 0.37 777 3.05 1.13 0.37 816
25 18 2.94 2.26 0.77 628 2.81 2.17 0.77 659 2.70 2.08 0.77 691 2.60 2.00 0.77 722
25 20 3.06 1.99 0.65 659 2.94 1.91 0.65 699 2.85 1.85 0.65 714 2.75 1.79 0.65 746
25 22 3.19 1.69 0.53 683 3.08 1.63 0.53 726 3.00 1.59 0.53 746 2.88 1.52 0.53 777
25 24 3.35 1.37 0.41 714 3.23 1.32 0.41 754 3.15 1.29 0.41 777 3.05 1.25 0.41 816
26 18 2.94 2.38 0.81 628 2.81 2.28 0.81 659 2.70 2.19 0.81 691 2.60 2.11 0.81 722
26 20 3.06 2.11 0.69 659 2.94 2.03 0.69 699 2.85 1.97 0.69 714 2.75 1.90 0.69 746
26 22 3.19 1.82 0.57 683 3.08 1.75 0.57 726 3.00 1.71 0.57 746 2.88 1.64 0.57 777
26 24 3.35 1.51 0.45 714 3.23 1.45 0.45 754 3.15 1.42 0.45 777 3.05 1.37 0.45 816
26 26 3.45 1.14 0.33 754 3.35 1.11 0.33 793 3.30 1.09 0.33 816 3.20 1.06 0.33 840
27 18 2.94 2.50 0.85 628 2.81 2.39 0.85 659 2.70 2.30 0.85 691 2.60 2.21 0.85 722
27 20 3.06 2.24 0.73 659 2.94 2.14 0.73 699 2.85 2.08 0.73 714 2.75 2.01 0.73 746
27 22 3.19 1.94 0.61 683 3.08 1.88 0.61 726 3.00 1.83 0.61 746 2.88 1.75 0.61 777
27 24 3.35 1.64 0.49 714 3.23 1.58 0.49 754 3.15 1.54 0.49 777 3.05 1.49 0.49 816
27 26 3.45 1.28 0.37 754 3.35 1.24 0.37 793 3.30 1.22 0.37 816 3.20 1.18 0.37 840
28 18 2.94 2.61 0.89 628 2.81 2.50 0.89 659 2.70 2.40 0.89 691 2.60 2.31 0.89 722
28 20 3.06 2.36 0.77 659 2.94 2.26 0.77 699 2.85 2.19 0.77 714 2.75 2.12 0.77 746
28 22 3.19 2.07 0.65 683 3.08 2.00 0.65 726 3.00 1.95 0.65 746 2.88 1.87 0.65 777
28 24 3.35 1.78 0.53 714 3.23 1.71 0.53 754 3.15 1.67 0.53 777 3.05 1.62 0.53 816
28 26 3.45 1.41 0.41 754 3.35 1.37 0.41 793 3.30 1.35 0.41 816 3.20 1.31 0.41 840
29 18 2.94 2.73 0.93 628 2.81 2.62 0.93 659 2.70 2.51 0.93 691 2.60 2.42 0.93 722
29 20 3.06 2.48 0.81 659 2.94 2.38 0.81 699 2.85 2.31 0.81 714 2.75 2.23 0.81 746
29 22 3.19 2.20 0.69 683 3.08 2.12 0.69 726 3.00 2.07 0.69 746 2.88 1.98 0.69 777
29 24 3.35 1.91 0.57 714 3.23 1.84 0.57 754 3.15 1.80 0.57 777 3.05 1.74 0.57 816
29 26 3.45 1.55 0.45 754 3.35 1.51 0.45 793 3.30 1.49 0.45 816 3.20 1.44 0.45 840
30 18 2.94 2.85 0.97 628 2.81 2.73 0.97 659 2.70 2.62 0.97 691 2.60 2.52 0.97 722
30 20 3.06 2.60 0.85 659 2.94 2.50 0.85 699 2.85 2.42 0.85 714 2.75 2.34 0.85 746
30 22 3.19 2.33 0.73 683 3.08 2.24 0.73 726 3.00 2.19 0.73 746 2.88 2.10 0.73 777
30 24 3.35 2.04 0.61 714 3.23 1.97 0.61 754 3.15 1.92 0.61 777 3.05 1.86 0.61 816
30 26 3.45 1.69 0.49 754 3.35 1.64 0.49 793 3.30 1.62 0.49 816 3.20 1.57 0.49 840
31 18 2.94 2.97 1.01 628 2.81 2.84 1.01 659 2.70 2.73 1.01 691 2.60 2.63 1.01 722
31 20 3.06 2.73 0.89 659 2.94 2.61 0.89 699 2.85 2.54 0.89 714 2.75 2.45 0.89 746
31 22 3.19 2.45 0.77 683 3.08 2.37 0.77 726 3.00 2.31 0.77 746 2.88 2.21 0.77 777
31 24 3.35 2.18 0.65 714 3.23 2.10 0.65 754 3.15 2.05 0.65 777 3.05 1.98 0.65 816
31 26 3.45 1.83 0.53 754 3.35 1.78 0.53 793 3.30 1.75 0.53 816 3.20 1.70 0.53 840
32 18 2.94 3.08 1.05 628 2.81 2.95 1.05 659 2.70 2.84 1.05 691 2.60 2.73 1.05 722
32 20 3.06 2.85 0.93 659 2.94 2.73 0.93 699 2.85 2.65 0.93 714 2.75 2.56 0.93 746
32 22 3.19 2.58 0.81 683 3.08 2.49 0.81 726 3.00 2.43 0.81 746 2.88 2.33 0.81 777
32 24 3.35 2.31 0.69 714 3.23 2.23 0.69 754 3.15 2.17 0.69 777 3.05 2.10 0.69 816
32 26 3.45 1.97 0.57 754 3.35 1.91 0.57 793 3.30 1.88 0.57 816 3.20 1.82 0.57 840

INDOOR INDOOR

CAPACITY:2.5(kW)

INPUT:785(W)SHF:0.79

21

OUTDOOR DB(:)

25 27 30

WB(:)

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

DB(:)

PERFORMANCE DATA COOL operation at Rated frequency

MUZ-HA25VA

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

14

PERFORMANCE DATA COOL operation at Rated frequency

MUZ-HA25VA

CAPACITY:2.5(kW)

INDOOR INDOOR

DB (:)WB (:)

21 18 2.45 1.49 0.61 769 2.25 1.37 0.61 816 2.08 1.27 0.61 848
21 20 2.58 1.26 0.49 801 2.40 1.18 0.49 840 2.23 1.09 0.49 887
22 18 2.45 1.59 0.65 769 2.25 1.46 0.65 816 2.08 1.35 0.65 848
22 20 2.58 1.36 0.53 801 2.40 1.27 0.53 840 2.23 1.18 0.53 887
22 22 2.73 1.12 0.41 832 2.55 1.05 0.41 879 2.38 0.97 0.41 911
23 18 2.45 1.69 0.69 769 2.25 1.55 0.69 816 2.08 1.43 0.69 848
23 20 2.58 1.47 0.57 801 2.40 1.37 0.57 840 2.23 1.27 0.57 887
23 22 2.73 1.23 0.45 832 2.55 1.15 0.45 879 2.38 1.07 0.45 911
24 18 2.45 1.79 0.73 769 2.25 1.64 0.73 816 2.08 1.51 0.73 848
24 20 2.58 1.57 0.61 801 2.40 1.46 0.61 840 2.23 1.36 0.61 887
24 22 2.73 1.34 0.49 832 2.55 1.25 0.49 879 2.38 1.16 0.49 911
24 24 2.88 1.06 0.37 864 2.70 1.00 0.37 903 2.55 0.94 0.37 942
25 18 2.45 1.89 0.77 769 2.25 1.73 0.77 816 2.08 1.60 0.77 848
25 20 2.58 1.67 0.65 801 2.40 1.56 0.65 840 2.23 1.45 0.65 887
25 22 2.73 1.44 0.53 832 2.55 1.35 0.53 879 2.38 1.26 0.53 911
25 24 2.88 1.18 0.41 864 2.70 1.11 0.41 903 2.55 1.05 0.41 942
26 18 2.45 1.98 0.81 769 2.25 1.82 0.81 816 2.08 1.68 0.81 848
26 20 2.58 1.78 0.69 801 2.40 1.66 0.69 840 2.23 1.54 0.69 887
26 22 2.73 1.55 0.57 832 2.55 1.45 0.57 879 2.38 1.35 0.57 911
26 24 2.88 1.29 0.45 864 2.70 1.22 0.45 903 2.55 1.15 0.45 942
26 26 3.03 1.00 0.33 895 2.85 0.94 0.33 934 2.68 0.88 0.33 973
27 18 2.45 2.08 0.85 769 2.25 1.91 0.85 816 2.08 1.76 0.85 848
27 20 2.58 1.88 0.73 801 2.40 1.75 0.73 840 2.23 1.62 0.73 887
27 22 2.73 1.66 0.61 832 2.55 1.56 0.61 879 2.38 1.45 0.61 911
27 24 2.88 1.41 0.49 864 2.70 1.32 0.49 903 2.55 1.25 0.49 942
27 26 3.03 1.12 0.37 895 2.85 1.05 0.37 934 2.68 0.99 0.37 973
28 18 2.45 2.18 0.89 769 2.25 2.00 0.89 816 2.08 1.85 0.89 848
28 20 2.58 1.98 0.77 801 2.40 1.85 0.77 840 2.23 1.71 0.77 887
28 22 2.73 1.77 0.65 832 2.55 1.66 0.65 879 2.38 1.54 0.65 911
28 24 2.88 1.52 0.53 864 2.70 1.43 0.53 903 2.55 1.35 0.53 942
28 26 3.03 1.24 0.41 895 2.85 1.17 0.41 934 2.68 1.10 0.41 973
29 18 2.45 2.28 0.93 769 2.25 2.09 0.93 816 2.08 1.93 0.93 848
29 20 2.58 2.09 0.81 801 2.40 1.94 0.81 840 2.23 1.80 0.81 887
29 22 2.73 1.88 0.69 832 2.55 1.76 0.69 879 2.38 1.64 0.69 911
29 24 2.88 1.64 0.57 864 2.70 1.54 0.57 903 2.55 1.45 0.57 942
29 26 3.03 1.36 0.45 895 2.85 1.28 0.45 934 2.68 1.20 0.45 973
30 18 2.45 2.38 0.97 769 2.25 2.18 0.97 816 2.08 2.01 0.97 848
30 20 2.58 2.19 0.85 801 2.40 2.04 0.85 840 2.23 1.89 0.85 887
30 22 2.73 1.99 0.73 832 2.55 1.86 0.73 879 2.38 1.73 0.73 911
30 24 2.88 1.75 0.61 864 2.70 1.65 0.61 903 2.55 1.56 0.61 942
30 26 3.03 1.48 0.49 895 2.85 1.40 0.49 934 2.68 1.31 0.49 973
31 18 2.45 2.47 1.01 769 2.25 2.27 1.01 816 2.08 2.10 1.01 848
31 20 2.58 2.29 0.89 801 2.40 2.14 0.89 840 2.23 1.98 0.89 887
31 22 2.73 2.10 0.77 832 2.55 1.96 0.77 879 2.38 1.83 0.77 911
31 24 2.88 1.87 0.65 864 2.70 1.76 0.65 903 2.55 1.66 0.65 942
31 26 3.03 1.60 0.53 895 2.85 1.51 0.53 934 2.68 1.42 0.53 973
32 18 2.45 2.57 1.05 769 2.25 2.36 1.05 816 2.08 2.18 1.05 848
32 20 2.58 2.39 0.93 801 2.40 2.23 0.93 840 2.23 2.07 0.93 887
32 22 2.73 2.21 0.81 832 2.55 2.07 0.81 879 2.38 1.92 0.81 911
32 24 2.88 1.98 0.69 864 2.70 1.86 0.69 903 2.55 1.76 0.69 942
32 26 3.03 1.72 0.57 895 2.85 1.62 0.57 934 2.68 1.52 0.57 973

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

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

INPUT:785(W)SHF:0.79

OUTDOOR DB(:)

35 40 46

15

21 18 3.70 2.15 0.58 836 3.54 2.06 0.58 878 3.40 1.97 0.58 920 3.28 1.90 0.58 961
21 20 3.86 1.78 0.46 878 3.70 1.70 0.46 930 3.59 1.65 0.46 951 3.47 1.59 0.46 993
22 18 3.70 2.29 0.62 836 3.54 2.20 0.62 878 3.40 2.11 0.62 920 3.28 2.03 0.62 961
22 20 3.86 1.93 0.50 878 3.70 1.85 0.50 930 3.59 1.80 0.50 951 3.47 1.73 0.50 993
22 22 4.02 1.53 0.38 909 3.87 1.47 0.38 967 3.78 1.44 0.38 993 3.62 1.38 0.38 1035
23 18 3.70 2.44 0.66 836 3.54 2.34 0.66 878 3.40 2.25 0.66 920 3.28 2.16 0.66 961
23 20 3.86 2.08 0.54 878 3.70 2.00 0.54 930 3.59 1.94 0.54 951 3.47 1.87 0.54 993
23 22 4.02 1.69 0.42 909 3.87 1.63 0.42 967 3.78 1.59 0.42 993 3.62 1.52 0.42 1035
24 18 3.70 2.59 0.70 836 3.54 2.48 0.70 878 3.40 2.38 0.70 920 3.28 2.29 0.70 961
24 20 3.86 2.24 0.58 878 3.70 2.15 0.58 930 3.59 2.08 0.58 951 3.47 2.01 0.58 993
24 22 4.02 1.85 0.46 909 3.87 1.78 0.46 967 3.78 1.74 0.46 993 3.62 1.67 0.46 1035
24 24 4.22 1.44 0.34 951 4.06 1.38 0.34 1003 3.97 1.35 0.34 1035 3.84 1.31 0.34 1087
25 18 3.70 2.74 0.74 836 3.54 2.62 0.74 878 3.40 2.52 0.74 920 3.28 2.42 0.74 961
25 20 3.86 2.39 0.62 878 3.70 2.29 0.62 930 3.59 2.23 0.62 951 3.47 2.15 0.62 993
25 22 4.02 2.01 0.50 909 3.87 1.94 0.50 967 3.78 1.89 0.50 993 3.62 1.81 0.50 1035
25 24 4.22 1.60 0.38 951 4.06 1.54 0.38 1003 3.97 1.51 0.38 1035 3.84 1.46 0.38 1087
26 18 3.70 2.89 0.78 836 3.54 2.76 0.78 878 3.40 2.65 0.78 920 3.28 2.56 0.78 961
26 20 3.86 2.55 0.66 878 3.70 2.44 0.66 930 3.59 2.37 0.66 951 3.47 2.29 0.66 993
26 22 4.02 2.17 0.54 909 3.87 2.09 0.54 967 3.78 2.04 0.54 993 3.62 1.96 0.54 1035
26 24 4.22 1.77 0.42 951 4.06 1.71 0.42 1003 3.97 1.67 0.42 1035 3.84 1.61 0.42 1087
26 26 4.35 1.30 0.30 1003 4.22 1.27 0.30 1055 4.16 1.25 0.30 1087 4.03 1.21 0.30 1118
27 18 3.70 3.04 0.82 836 3.54 2.91 0.82 878 3.40 2.79 0.82 920 3.28 2.69 0.82 961
27 20 3.86 2.70 0.70 878 3.70 2.59 0.70 930 3.59 2.51 0.70 951 3.47 2.43 0.70 993
27 22 4.02 2.33 0.58 909 3.87 2.25 0.58 967 3.78 2.19 0.58 993 3.62 2.10 0.58 1035
27 24 4.22 1.94 0.46 951 4.06 1.87 0.46 1003 3.97 1.83 0.46 1035 3.84 1.77 0.46 1087
27 26 4.35 1.48 0.34 1003 4.22 1.44 0.34 1055 4.16 1.41 0.34 1087 4.03 1.37 0.34 1118
28 18 3.70 3.18 0.86 836 3.54 3.05 0.86 878 3.40 2.93 0.86 920 3.28 2.82 0.86 961
28 20 3.86 2.86 0.74 878 3.70 2.74 0.74 930 3.59 2.66 0.74 951 3.47 2.56 0.74 993
28 22 4.02 2.49 0.62 909 3.87 2.40 0.62 967 3.78 2.34 0.62 993 3.62 2.25 0.62 1035
28 24 4.22 2.11 0.50 951 4.06 2.03 0.50 1003 3.97 1.98 0.50 1035 3.84 1.92 0.50 1087
28 26 4.35 1.65 0.38 1003 4.22 1.60 0.38 1055 4.16 1.58 0.38 1087 4.03 1.53 0.38 1118
29 18 3.70 3.33 0.90 836 3.54 3.19 0.90 878 3.40 3.06 0.90 920 3.28 2.95 0.90 961
29 20 3.86 3.01 0.78 878 3.70 2.89 0.78 930 3.59 2.80 0.78 951 3.47 2.70 0.78 993
29 22 4.02 2.65 0.66 909 3.87 2.56 0.66 967 3.78 2.49 0.66 993 3.62 2.39 0.66 1035
29 24 4.22 2.28 0.54 951 4.06 2.19 0.54 1003 3.97 2.14 0.54 1035 3.84 2.08 0.54 1087
29 26 4.35 1.83 0.42 1003 4.22 1.77 0.42 1055 4.16 1.75 0.42 1087 4.03 1.69 0.42 1118
30 18 3.70 3.48 0.94 836 3.54 3.33 0.94 878 3.40 3.20 0.94 920 3.28 3.08 0.94 961
30 20 3.86 3.16 0.82 878 3.70 3.04 0.82 930 3.59 2.94 0.82 951 3.47 2.84 0.82 993
30 22 4.02 2.81 0.70 909 3.87 2.71 0.70 967 3.78 2.65 0.70 993 3.62 2.54 0.70 1035
30 24 4.22 2.45 0.58 951 4.06 2.36 0.58 1003 3.97 2.30 0.58 1035 3.84 2.23 0.58 1087
30 26 4.35 2.00 0.46 1003 4.22 1.94 0.46 1055 4.16 1.91 0.46 1087 4.03 1.85 0.46 1118
31 18 3.70 3.63 0.98 836 3.54 3.47 0.98 878 3.40 3.33 0.98 920 3.28 3.21 0.98 961
31 20 3.86 3.32 0.86 878 3.70 3.18 0.86 930 3.59 3.09 0.86 951 3.47 2.98 0.86 993
31 22 4.02 2.97 0.74 909 3.87 2.87 0.74 967 3.78 2.80 0.74 993 3.62 2.68 0.74 1035
31 24 4.22 2.62 0.62 951 4.06 2.52 0.62 1003 3.97 2.46 0.62 1035 3.84 2.38 0.62 1087
31 26 4.35 2.17 0.50 1003 4.22 2.11 0.50 1055 4.16 2.08 0.50 1087 4.03 2.02 0.50 1118
32 18 3.70 3.78 1.02 836 3.54 3.61 1.02 878 3.40 3.47 1.02 920 3.28 3.34 1.02 961
32 20 3.86 3.47 0.90 878 3.70 3.33 0.90 930 3.59 3.23 0.90 951 3.47 3.12 0.90 993
32 22 4.02 3.13 0.78 909 3.87 3.02 0.78 967 3.78 2.95 0.78 993 3.62 2.83 0.78 1035
32 24 4.22 2.79 0.66 951 4.06 2.68 0.66 1003 3.97 2.62 0.66 1035 3.84 2.54 0.66 1087
32 26 4.35 2.35 0.54 1003 4.22 2.28 0.54 1055 4.16 2.25 0.54 1087 4.03 2.18 0.54 1118

INDOOR INDOOR

CAPACITY:3.15(kW)

INPUT:1045(W)SHF:0.76

21

OUTDOOR DB(:)

25 27 30

WB(:)

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

DB(:)

PERFORMANCE DATA COOL operation at Rated frequency

MUZ-HA35VA

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

16

PERFORMANCE DATA COOL operation at Rated frequency

MUZ-HA35VA

CAPACITY:3.15(kW)

INDOOR INDOOR

DB (:)WB (:)

21 18 3.09 1.79 0.58 1024 2.84 1.64 0.58 1087 2.61 1.52 0.58 1129
21 20 3.24 1.49 0.46 1066 3.02 1.39 0.46 1118 2.80 1.29 0.46 1181
22 18 3.09 1.91 0.62 1024 2.84 1.76 0.62 1087 2.61 1.62 0.62 1129
22 20 3.24 1.62 0.50 1066 3.02 1.51 0.50 1118 2.80 1.40 0.50 1181
22 22 3.43 1.30 0.38 1108 3.21 1.22 0.38 1170 2.99 1.14 0.38 1212
23 18 3.09 2.04 0.66 1024 2.84 1.87 0.66 1087 2.61 1.73 0.66 1129
23 20 3.24 1.75 0.54 1066 3.02 1.63 0.54 1118 2.80 1.51 0.54 1181
23 22 3.43 1.44 0.42 1108 3.21 1.35 0.42 1170 2.99 1.26 0.42 1212
24 18 3.09 2.16 0.70 1024 2.84 1.98 0.70 1087 2.61 1.83 0.70 1129
24 20 3.24 1.88 0.58 1066 3.02 1.75 0.58 1118 2.80 1.63 0.58 1181
24 22 3.43 1.58 0.46 1108 3.21 1.48 0.46 1170 2.99 1.38 0.46 1212
24 24 3.62 1.23 0.34 1150 3.40 1.16 0.34 1202 3.21 1.09 0.34 1254
25 18 3.09 2.28 0.74 1024 2.84 2.10 0.74 1087 2.61 1.93 0.74 1129
25 20 3.24 2.01 0.62 1066 3.02 1.87 0.62 1118 2.80 1.74 0.62 1181
25 22 3.43 1.72 0.50 1108 3.21 1.61 0.50 1170 2.99 1.50 0.50 1212
25 24 3.62 1.38 0.38 1150 3.40 1.29 0.38 1202 3.21 1.22 0.38 1254
26 18 3.09 2.41 0.78 1024 2.84 2.21 0.78 1087 2.61 2.04 0.78 1129
26 20 3.24 2.14 0.66 1066 3.02 2.00 0.66 1118 2.80 1.85 0.66 1181
26 22 3.43 1.85 0.54 1108 3.21 1.74 0.54 1170 2.99 1.62 0.54 1212
26 24 3.62 1.52 0.42 1150 3.40 1.43 0.42 1202 3.21 1.35 0.42 1254
26 26 3.81 1.14 0.30 1191 3.59 1.08 0.30 1244 3.37 1.01 0.30 1296
27 18 3.09 2.53 0.82 1024 2.84 2.32 0.82 1087 2.61 2.14 0.82 1129
27 20 3.24 2.27 0.70 1066 3.02 2.12 0.70 1118 2.80 1.96 0.70 1181
27 22 3.43 1.99 0.58 1108 3.21 1.86 0.58 1170 2.99 1.74 0.58 1212
27 24 3.62 1.67 0.46 1150 3.40 1.56 0.46 1202 3.21 1.48 0.46 1254
27 26 3.81 1.30 0.34 1191 3.59 1.22 0.34 1244 3.37 1.15 0.34 1296
28 18 3.09 2.65 0.86 1024 2.84 2.44 0.86 1087 2.61 2.25 0.86 1129
28 20 3.24 2.40 0.74 1066 3.02 2.24 0.74 1118 2.80 2.07 0.74 1181
28 22 3.43 2.13 0.62 1108 3.21 1.99 0.62 1170 2.99 1.86 0.62 1212
28 24 3.62 1.81 0.50 1150 3.40 1.70 0.50 1202 3.21 1.61 0.50 1254
28 26 3.81 1.45 0.38 1191 3.59 1.36 0.38 1244 3.37 1.28 0.38 1296
29 18 3.09 2.78 0.90 1024 2.84 2.55 0.90 1087 2.61 2.35 0.90 1129
29 20 3.24 2.53 0.78 1066 3.02 2.36 0.78 1118 2.80 2.19 0.78 1181
29 22 3.43 2.27 0.66 1108 3.21 2.12 0.66 1170 2.99 1.98 0.66 1212
29 24 3.62 1.96 0.54 1150 3.40 1.84 0.54 1202 3.21 1.74 0.54 1254
29 26 3.81 1.60 0.42 1191 3.59 1.51 0.42 1244 3.37 1.42 0.42 1296
30 18 3.09 2.90 0.94 1024 2.84 2.66 0.94 1087 2.61 2.46 0.94 1129
30 20 3.24 2.66 0.82 1066 3.02 2.48 0.82 1118 2.80 2.30 0.82 1181
30 22 3.43 2.40 0.70 1108 3.21 2.25 0.70 1170 2.99 2.09 0.70 1212
30 24 3.62 2.10 0.58 1150 3.40 1.97 0.58 1202 3.21 1.86 0.58 1254
30 26 3.81 1.75 0.46 1191 3.59 1.65 0.46 1244 3.37 1.55 0.46 1296
31 18 3.09 3.03 0.98 1024 2.84 2.78 0.98 1087 2.61 2.56 0.98 1129
31 20 3.24 2.79 0.86 1066 3.02 2.60 0.86 1118 2.80 2.41 0.86 1181
31 22 3.43 2.54 0.74 1108 3.21 2.38 0.74 1170 2.99 2.21 0.74 1212
31 24 3.62 2.25 0.62 1150 3.40 2.11 0.62 1202 3.21 1.99 0.62 1254
31 26 3.81 1.91 0.50 1191 3.59 1.80 0.50 1244 3.37 1.69 0.50 1296
32 18 3.09 3.15 1.02 1024 2.84 2.89 1.02 1087 2.61 2.67 1.02 1129
32 20 3.24 2.92 0.90 1066 3.02 2.72 0.90 1118 2.80 2.52 0.90 1181
32 22 3.43 2.68 0.78 1108 3.21 2.51 0.78 1170 2.99 2.33 0.78 1212
32 24 3.62 2.39 0.66 1150 3.40 2.25 0.66 1202 3.21 2.12 0.66 1254
32 26 3.81 2.06 0.54 1191 3.59 1.94 0.54 1244 3.37 1.82 0.54 1296

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

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

INPUT:1045(W)SHF:0.76

OUTDOOR DB(:)

35 40 46

17

PERFORMANCE DATA HEAT operation at Rated frequency

CAPACITY:3.2(kW)

INPUT:945(W)

OUTDOOR WB(:)

INDOOR

-10 -5 0 5 10 15 20

DB(:)

Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT
15 2.02 614 2.43 737 2.85 832 3.26 898 3.68 954 4.06 983 4.48 1002
21 1.92 662 2.30 784 2.72 869 3.10 936 3.52 983 3.90 1011 4.30 1049
26 1.73 709 2.14 832 2.53 917 2.94 983 3.36 1030 3.74 1058 4.16 1087

CAPACITY:3.6(kW)

INPUT:1070(W)

OUTDOOR WB(:)

INDOOR

-10 -5 0 5 10 15 20

DB(:)

Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT
15 2.27 696 2.74 835 3.20 942 3.67 1017 4.14 1081 4.57 1113 5.04 1134
21 2.16 749 2.59 888 3.06 984 3.49 1059 3.96 1113 4.39 1145 4.84 1188
26 1.94 803 2.41 942 2.84 1038 3.31 1113 3.78 1166 4.21 1198 4.68 1231

MUZ-HA25VA

MUZ-HA35VA

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

18

9

Discharge temperature thermistor
Indoor coil temperature thermistor

Defrost thermistor

Fin temperature thermistor

Purpose

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

Protection

Compressor

Outdoor

fan motor

Indoor

fan motor

R.V. coil

Sensor

Actuator

ON

OFF

ON

OFF

Outdoor fan
motor

Compressor

5 seconds 15 seconds

ON
OFF

Compressor

Outdoor fan
motor

R.V.coil

ON
OFF

ON
OFF

<COOL>

5 seconds

<HEAT>

5 seconds

ON or OFF

ON or OFF

ACTUATOR CONTROL

MUZ-HA25VA MUZ-HA35VA

9-1. Outdoor fan motor control

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

9-2. R.V. coil control

Heating

Cooling . . . . . . . . . . . . . . . . . OFF

Dry

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

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

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

ON
OFF

9-3. Relation between main sensor and actuator

19

10

Jumper wire

Defrost finish temperature

JS

none

(cut)

soldered

(Initial setting)

8:

5:

Housing point

SERVICE FUNCTIONS

MUZ-HA25VA MUZ-HA35VA

CHANGE IN DEFROST SETTING

<JS> When the JS wire of the outdoor Inverter P.C. board is cut/ soldered, the defrost finish temperature is changed.

(Refer to 11-6-1.)

11

TROUBLESHOOTING

MUZ-HA25VA MUZ-HA35VA

11-1. Cautions on troubleshooting

1. Before troubleshooting, check the following:

1) Check the power supply voltage.

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

2. Take care the following during servicing.

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

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

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

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

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

Lead wiring

3. Troubleshooting procedure

1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality.
To make sure, check how many times the abnormality indication is flashing on and off before starting service work.

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

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

4) When troubleshooting, refer to 11-2. and 11-3.

20

Operational procedure

Yes

(Blinks)

No

(OFF)

Yes

No

Releasing the failure mode recall function

Note1.Make sure to release the failure mode recall function once it's set up, otherwise the unit cannot operate properly.

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

W2. Blinking pattern when the indoor unit is abnormal:

W3.Blinking pattern when the outdoor unit is abnormal:

ON

OFF

Beeps

Repeated cycle Repeated cycle

ON

OFF

No beep Beeps

Repeated cycle

2.5-second OFF

Blinking at 0.5­second interval

2.5-second OFF 3-second ON

Blinking at 0.5­second interval

Beeps

Repeated cycle

2.5-second OFF

Blinking at 0.5­second interval

No beep Beeps

Repeated cycle

2.5-second OFF 3-second ON

Blinking at 0.5­second interval

Repeated cycle

Beeps

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

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

Setting up the failure mode recall function

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

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

Turn ON the power supply.
<

Preparation of the remote controller

>
1 While pressing both OPERATION SELECT
button and TOO COOL button on the remote controller at the same time, press
RESET button.
2 First, release RESET button.
And release the other two buttons after all LCD in operation display section of the

remote controller is displayed after 3 seconds.

Deleting the abnormal memorized condition

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

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

mentioned above.

Repair the defective parts.

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

Judgment of indoor/outdoor abnormality

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

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

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

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

11-2. Failure mode recall function

Outline of the function
This air conditioner can memorize the abnormal condition which has occurred once.
Even though LED indication listed on the troubleshooting check table (11-4.) disappears, the memorized failure details
can be recalled.
This mode is very useful when the unit needs to be repaired for the abnormality which doesn't recur.

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

21

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

Operational procedure

Note1. Make sure to release the failure mode recall function once it's set up, otherwise the unit cannot operate properly.

2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.
W2.Blinking pattern when outdoor unit is abnormal:

Yes

(Blinks)

No

(OFF)

ON

OFF

No beep

Beeps

Repeated cycle

2.5-second OFF 3-second ON

Blinking at 0.5­second interval

No beep Beeps

Repeated cycle

2.5-second OFF 3-second ON

Blinking at 0.5-

second interval

Repeated cycle

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

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

Deleting the abnormal memorized condition

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

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

mentioned above.

Repair the defective parts.

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

The outdoor unit is normal.

Releasing the failure mode recall function

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

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

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

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

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

22

3. Outdoor unit failure mode table

None (Normal)
Outdoor power system

Discharge temperature thermistor
Defrost thermistor
Fin temperature thermistor

P.C. board temperature thermistor

Overcurrent

Compressor synchronous
abnormality (Compressor start-up
failure protection)

Discharge temperature

High pressure

Fin temperature/ P.C. board
temperature

Nonvolatile memory data

Discharge temperature

DC voltage

Each phase current of compressor

Overcurrent
Compressor open-phase

Outdoor unit
(Other abnormality)

Abnormal point

(Failure mode / protection)

When it consecutively occurs 3 times
that the compressor stops for
overcurrent protection within
1 minute after stat-up.

When thermistor shorts or opens
during compressor running.

When 12A(MUZ-HA25)/ 14A(MUZ­HA35)

current flow into intelligent

power module.

When waveform of compressor current
is distorted.

When temperature of discharge
temperature thermistor exceeds 116:,

compressor stops.
Compressor can restart if discharge
temperature thermistor reads 100: or
less 3 minutes later.

When temperature of indoor coil
thermistor exceeds 70: in HEAT mode.
When defrost thermistor exceeds 70:
in COOL mode.
When temperature of fin temperature
thermistor on the inverter P.C. board
exceeds 82:(MUZ-HA25)/83:
(MUZ-HA35), or temperature of P.C.
board temperature thermistor on the
inverter P.C. board exceeds 81:
(MUZ-HA25)/ 85:(MUZ-HA35).
When nonvolatile memory data cannot
be read properly.
When temperature of discharge tempe­rature thermistor has been 50: or less
for 20 minutes.

When DC voltage of inverter cannot be
detected normally.

When each phase current of compre­ssor cannot be detected normally.

When 12A(MUZ-HA25)/ 14A(MUZ­HA35) current flow into intelligent
power module (IPM).
When the open-phase operation of
compressor is detected.
When the interphase short out occurs in
the output of the intelligent power
module (IPM).
When the compressor winding shorts out.
When the inverter P.C. board is
defective.

Condition

•Reconnect connectors.

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

•Check stop valve.

•Refer to 11-5.

G"Check

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

•Reconnect compressor
connector.

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

•Check stop valve.

•Reconnect compressor
connector.

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

•Check refrigerant circuit
and refrigerant amount.

•Check refrigerant circuit
and refrigerant amount.

•Check stop valve.

•Check around outdoor unit.

•Check outdoor unit air
passage.

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

•Replace the inverter P.C.
board.

•Check refrigerant circuit
and refrigerant amount.

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

•Reconnect compressor
connector.

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

•Replace the inverter P.C.
board.

Correspondence

Indoor/outdoor

unit failure mode

recall function

Outdoor unit
failure mode

recall function

1-time flash every

2.5 seconds
3-time flash

2.5 seconds OFF
4-time flash

2.5 seconds OFF

11-time flash

2.5 seconds OFF

12-time flash

2.5 seconds OFF

7-time flash

2.5 seconds OFF

5-time flash

2.5 seconds OFF

8-time flash

2.5 seconds OFF
9-time flash

2.5 seconds OFF
10-time flash

2.5 seconds OFF

LED indication

(Outdoor P.C. board)

OFF
2-time flash

2.5 seconds OFF

3-time flash

2.5 seconds OFF

4-time flash

2.5 seconds OFF

5-time flash

2.5 seconds OFF

6-time flash

2.5 seconds OFF

7-time flash

2.5 seconds OFF

9-time flash

2.5 seconds OFF
10-time flash

2.5 seconds OFF

11-time flash

2.5 seconds OFF

12-time flash

2.5 seconds OFF

14-time flash

2.5 seconds OFF

The left lamp of

OPERATION INDICAOR

lamp(Indoor unit)

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

23

Abnormal point/ Condition

When it consecutively occurs 3 times that the compressor stops
for overcurrent protection within 1minute after start-up.

When discharge temperature thermistor, fin temperature
thermistor, defrost thermistor, P.C. board temperature
thermistor shorts or opens during compressor running.

When nonvolatile memory data cannot be read properly.
(When the left lamp of OPERATION INDICATOR lamp of the

indoor unit lights up or flashes 7-time.)

When 12A(MUZ-HA25)/ 14A(MUZ-HA35) current flows into
intelligent power module.

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

When temperature of fin temperature thermistor on the heat
sink exceeds 82:(MUZ-HA25)/ 83:(MUZ-HA35) or
temperature of P.C. board temperature thermistor on the
inverter P.C.board exceeds 81:(MUZ-HA25)/ 85:(MUZ­HA35).

When indoor coil thermistor exceeds 70: in HEAT mode.
When the defrost thermistor exceeds 70: in COOL mode.

When current from power outlet exceeds 5.2A(MUZ-HA25)/

6.1A(MUZ-HA35), compressor frequency lowers.

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

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

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

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

No.

1

2

3

6

7

8

9

13

14

15

16

17

Symptom

LED indication

Condition

Correspondence

Outdoor unit
does not
operate.

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

Outdoor unit
operates.

Outdoor unit
operates.

1-time flash every

2.5 seconds

2-time flash

2.5 seconds OFF

3-time flash

2.5 seconds OFF

4-time flash

2.5 seconds OFF

5-time flash

2.5 seconds OFF

1-time flash

2.5 seconds OFF

3-time flash

2.5 seconds OFF

4-time flash

2.5 seconds OFF

7-time flash

2.5 seconds OFF

Outdoor power
system

Outdoor
thermistors

Outdoor control
system

Overcurrent
protection

Discharge
temperature
overheat
protection

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

High pressure
protection

Frequency drop by
current protection

Frequency drop by
high pressure
protection

Frequency drop by
defrosting in COOL
mode

Frequency drop by
discharge
temperature
protection

Low discharge
temperature
protection

·

Reconnect connector of compressor.

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

· Check stop valve.

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

·

Reconnect connector of compressor.

· Refer to 11-5.A "How to check

inverter/compressor".

· Check stop valve.

Replace inverter P.C. board.

· Check refrigerant circuit and
refrigerant amount.

·.

· Check around outdoor unit.

· Check outdoor unit air passage.

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

· Check refrigerant circuit and
refrigerant amount.

· Check stop valve.

The unit is normal, but check the
following.

· Check if indoor filters are clogged.

· Check if refrigerant is short.

· Check if indoor/outdoor unit air
circulation is short cycled.

· Check refrigerant circuit and
refrigerant amount.

Inverter P.C. board (Parts side)

LED

Flashing

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

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

serial signal

8-time flash

2.5 seconds OFF

Compressor
synchronous
abnormality

When the waveform of compressor current is distorted.

·

Reconnect connector of compressor.

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

8-time flash

2.5 seconds OFF

PAM protection
PAM:

Pulse
Amplitude
Modulation

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

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

9-time flash

2.5 seconds OFF

Inverter check
mode

When the connector of compressor is disconnected, inverter
check mode starts.

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

4

10

18

6-time flash

2.5 seconds OFF

11

12

12-time flash

2.5 seconds OFF

Each phase
current of
compressor

When each phase current of compressor cannot be detected
normally

· Refer to 11-5.A "How to check

inverter/compressor".

13-time flash

2.5 seconds OFF

DC voltage

When DC voltage of inverter cannot be detected normally.

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

· Check refrigerant circuit and
refrigerant amount.

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

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

When outdoor unit is defective.

Outdoor unit
(Other abnormality)

5

14-time flash

2.5 seconds OFF

11-3. Troubleshooting check table

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

The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF.

2. LED is lighted during normal operation.

(Example) When the flashing frequency is “2”.

ON
OFF

2.5-second OFF

0.5-second ON

2.5-second OFF

0.5-second ON

24

11-4. Trouble criterion of main parts

Part name FigureCheck method and criterion

Outdoor fan motor(MF)
INNER FUSE
RA6V21-AB
152i : CUT OFF
RA6V21-BB
130: CUT OFF

0
5

R.V. coil(21S4)

Measure the resistance between the terminals with a tester.
(Part temperature –10˚C ~ 40˚C)

Measure the resistance between the terminals with a tester.
(Part temperature –10˚C ~ 40˚C)

Normal

1.32 k" ~ 1.62 k"

Measure the resistance between the terminals with a tester.
(Part temperature –10˚C ~ 40˚C)

Compressor(MC)

U-V

U-W

V-W

Normal

1.34 " ~ 1.66 "

1.65 " ~ 2.03"

MUZ-HA35VA

MUZ-HA25VA

23

W

U

V

1

WHT

RED BLK

WHT

RED

BLK

FUSE

Measure the resistance with a tester.

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

Refer to 11-6. "Test point diagram and voltage", 1. "Inverter P.C. board",
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.

Defrost thermistor
(RT61)

Fin temperature
thermistor (RT64)

Normal

RA6V21-BB

RA6V21-AB

WHT – BLK

BLK – RED

Color of the

lead wire

305 " ~ 374 "
247 " ~ 304 "

222 " ~ 272 "
245 " ~ 300 "

Model

MUZ-HA25VA MUZ-HA35VA

25

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

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

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

<<Measurement point>>

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

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

2. Measure the voltage by analog type tester.

3. During this check, LED of inverter P.C. board flashes 9 times.

●Measure the resistance between the terminals on the intelligent
power module.

<<Measurement point>>
at 6 points
BLK-WHT, WHT-BLK
BLK-RED, RED-BLK
WHT-RED, RED-WHT

<<Judgement>>
Infinite ["]···········Normal
0~dozens of ······Abnormal (short)

Output voltage 115V

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

ohmmeter indication

Normal
(infinite)

Abnormal
(0~dozens of ")

X1

"

X1

"

LED

Inverter P.C. board
(Parts side)

9-time flash

2.5-second OFF

Flashing

11-5. Troubleshooting flow

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

A

How to check inverter/ compressor

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

Check the voltage
between terminals.

Are the voltages

balanced?

Yes

Check the
compressor.

B

Check of open phase

See 11-5.B “Check of open phase” .

No

Check the resistance of the intelligent
power module.

See 11-5.D “Check of compressor” .

See 11-5.C 'Check of intelligent power module'.

Is the resistance
infinite?

No
(0~several

Yes

Replace the inverter P.C.
board.

")

Replace the inverter P.C.
board and compressor.

C

Check of intelligent power module

26

D

Check of compressor

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

Yes

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

Does the compressor
operate continuously?

Yes

Ok

E

Check of compressor winding

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

<<Measurement point>>

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

<<Judgement>>

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

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

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

No

No

Replace the compressor.

Is the compressor
operation time more than
10 seconds?

Yes

Check the refrigerant circuit.

No

Replace the compressor.

Check of compressor operation time

F

●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 outdoor fan running to the stop of

compressor due to over current.

<<Judgement>>

For reference
0~10 seconds·····················Abnormal (compressor short or poor contact)
(compressor lock-out)
10 seconds~5 minutes·······Abnormal (refrigerant circuit defect)
more than 5 minutes···········Normal

27

0 second

10 seconds

5 minutes

Outdoor fan starts
Abnormal
(Compressor winding short or layer short)
(Compressor connector poor contact)
(Compressor lock-out)

Abnormal
(Refrigerant circuit defect, etc.)

Normal

When OPERATION INDICATOR lamp flashes 6-time.

Measure the
resistance
between CN641
1 and 2.

Measure the
resistance
between CN642
1 and 2.

No

Yes

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

Replace the inverter

P.C. board.

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

(Check the characteristics of each thermistor.)

Defrost thermistor RT61

Measure the
resistance
between CN641
3 and 4.

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

Discharge
temperature
thermistor RT62

Fin temperature
thermistor RT64

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

No

Yes

Does the unit operate
10 minutes or more?

OK.
(Cause is poor
contact.)

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

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

Yes

No

Replace the
power P.C. board.

Replace the 4-way valve.

Replace the 4-way valve.

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

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

No

Yes

Replace the
power P.C. board.

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

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

CN721

Power P.C. board
(Soldered side)

The thermistors in the outdoor unit are abnormal.

G

Check of outdoor thermistors

Check of R.V. coil

H

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

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

28

Outdoor fan motor does not operate.

Replace the
outdoor fan motor.

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

Is the resistance of fan
motor normal?

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

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

Yes

Yes

No

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

Replace the
power P.C. board.

No

Replace the outdoor
fan motor.

I

Check of outdoor fan motor

29

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

Turn ON the power
supply and press
EMERGENCY
OPERATION switch.

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

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

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

No

Yes

No

No

Yes

Yes

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

Replace the power P.C.board.

Replace the power P.C. board.

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

Inverter does not operate.

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

Check the electric
parts in main circuit.

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

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

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

Yes

Yes

Yes

No

No

Replace the indoor

electronic control
P.C. board.

No

Yes

No

Replace the inverter
P.C. board.

DB61

280V~370V DC

Inverter P.C. board
(Solder side)

Is there voltage 230V AC

between the indoor
terminal block S1 and
S2?

Rectify indoor/ outdoor
connecting wire.

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

Check of power supply

J

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

Check of current-limiting resistor

K

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

30

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

Is there rated voltage in
the power supply?

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

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

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

W3. Be sure to check this within 3 minutes after turning ON.

After 3 minutes, LED blinks 6 times. Even when
the inverter P.C.board or the outdoor electronic control
P.C.board is normal, LED blinks 6 times after 3 minutes.
(Except for outdoor unit of multi system type)

(Lighted or
not lighted)

No

Yes

No

Yes

Yes

No

Yes

No

Yes

W2 Be careful to the residual
voltage of smoothing capacitor.

No

No

Yes

No

Yes

Yes

Turn OFF the power supply.

Turn ON the power supply.

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

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

Press EMERGENCY OPERATION switch once.

Check the power
supply.

A

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

Short-circuit outdoor terminal block S2 and
S3.
W1

B

Turn ON the power supply.

Check the wiring.

Make them correct.

Turn OFF the power supply.
Remove the short-circuit between
outdoor terminal block S2 and S3.
Turn ON the power supply.
Is there amplitude of 10 to 20V DC
between indoor terminal block S2
and S3? <Confirmation of serial
signal>
Is there rated voltage between
indoor terminal block S1 and S2?
<Confirmation of power voltage>

No

No

No

Yes

Yes

Yes

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

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

No

Replace the
indoor/outdoor
connecting wire.

Is serial signal
error indicated
6 minutes later?

Yes

No

· Turn OFF inverter-controlled lighting
equipment.

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

· Press EMERGENCY OPERATION
switch.

B

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

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

A

Is serial signal error indicated 6 minutes later?

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

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

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

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

Does the LED on the inverter P.C. board
or the outdoor electronic control P.C. board
repeat "3.6-second-OFF and 0.8-second-ON
quick blinking"? W3

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

Replace the indoor
electronic control P.C. board.

Indoor unit does not operate.

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

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

L

31

M

Electromagnetic noise enters into TV sets or radios

Is the unit earthed?

Yes

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

No

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

No

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

No

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

No

Yes

Yes

Yes

Yes

Earth the unit.

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

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

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

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

No

Even if all of the above conditions is fulfilled, the electromagnetic noise may enter, depending on
the electric field strength or the installation condition (combination of specific conditions such as
antennas or wiring).
Check the followings before asking for service.

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

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

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

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

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

6.Presence or absence of amplifier such as booster

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

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

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

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

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

After checking the above, consult the service representative.

32

-20 -10 0 10 20 30 40

0

10

20

30

40

50

60

70

80

90

100

Temperature(:)

Defrost thermistor(RT61)

Temperature(:)

Discharge temperature thermistor(RT62)

0 102030405060708090100110120

0

100

200

300

400

500

600

700

0 1020304050607080

0

20

40

60

80

100

120

140

160

180

200

Temperature(:)

Fin temperature thermistor(RT64)

Resistance(k")

Resistance(k")

Resistance(k")

11-6. Test point diagram and voltage

1. Inverter P.C. board

MUZ-HA25VA
MUZ-HA35VA

Back side of unit

DB61
280V ~ 370V
DC

(+)

(-)

Output to
drive
compressor
(LDW,
LDV,
LDU)

230V AC
DB61

Smoothing capacitor
(C63C)

Smoothing capacitor
(C63B)

FUSE
(F801)

LED monitor
lamp

Jumper wire for change
in defrost setting (JS)

Front side of unit

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

33

(CN641)

Defrost thermistor/RT61

(CN641)

Discharge temperature

thermistor/RT62

Fin temperature

thermistor/RT64

(CN642)

Connector for indoor/
outdoor communication
(CN601)

2. Power P.C. board

MUZ-HA25VA
MUZ-HA35VA

Back side of unit

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

FUSE
(F71)

Varistor
(NR63)

V aristor
(NR62)

Varistor
(NR64)

Front side of unit

230V AC

Output to drive outdoor
Fan motor(CN771)
230V AC

R.V.coil(CN721)
230V AC

34

12

DISASSEMBLY INSTRUCTIONS

<"Terminal with locking mechanism" Detaching points>

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

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

Sleeve

1Slide the sleeve.
2Pull the terminal while

Locking lever

pushing the locking
lever.

MUZ-HA25VA MUZ-HA35VA

OPERATING PROCEDURE

1. Removing the cabinet.

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

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

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

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

Connector

PHOTOS

Photo 1

Screws
of the
top panel

Screw of
the cabinet

Screws of
the top panel

Photo 2

Screws of
the cabinet

Screw of the

service panel

Direction to
remove

Hooks

Screws of
the cabinet

Back
panel

Service

panel

35

OPERATING PROCEDURE

PHOTOS

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

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

(Refer to 1.)

(2) Disconnect the power supply and indoor/outdoor

connecting wire and remove the back panel. (Refer to 1.)

(3) Disconnect the ground wires (See Photo 3.), the lead wire

to the reactor and the following connectors;
<Power P.C. board>
CN721 (4-way valve)
CN771 (Fan motor)
<Inverter P.C. board>
CN641 (Defrost thermistor and discharge temperature

thermistor)
(4) Remove the compressor connector (CN61).
(5) Remove the screws fixing the relay panel. (See Photo 3.)
(6) Remove the inverter assembly. (See Photo 3.)
(7) Disconnect all connectors and lead wires on the inverter

P.C. board. (See Photo 4.)
(8) Remove the inverter P.C. board from the inverter assembly.
(9) Remove the screw fixing the power P.C. board. (See Photo

4.)

(10)

Disconnect all connectors and lead wires on the power P.C.

board.

(11)

Remove the power P.C. board from the inverter assembly.

Photo 3

Photo 4

Heat sink

Screws of the
relay panel

(This picture shows MUZ-HA35.)

Inverter
P.C. board

Screws of
the ground
wires

Power
P.C. board

3. Removing R.V. coil

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

(Refer to 1.)
(2) Disconnect the power supply and indoor/outdoor

connecting wire and remove the back panel. (Refer to 1.)
(3) Remove the inverter assembly. (Refer to 2.)
(4) Remove the R.V. coil. (See Photo 5.)

4. Removing the discharge temperature thermistor and
defrost thermistor

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

(Refer to 1.)

(2) Disconnect the power supply and indoor/outdoor

connecting wire and remove the back panel. (Refer to 1.)
(3) Remove the inverter assembly. (Refer to 2.)
(4) Pull out the discharge temperature thermistor from its

holder. (See Photo 5.)
(5) Pull out the defrost thermistor from its holder. (See Photo 6.)

Photo 5

Screw of the
power P.C. board

R.V. coil

36

Discharge temperature thermistor

OPERATING PROCEDURE

PHOTOS

5. Removing outdoor fan motor

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

(Refer to 1.)

(2) Disconnect the power supply and indoor/outdoor

connecting wire and remove the back panel. (Refer to 1.)
(3) Disconnect the connectors for outdoor fan motor.
(4) Remove the propeller nut.
(5) Remove the propeller.
(6) Remove the screws fixing the fan motor. (See Photo 7.)
(7) 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) Disconnect the power supply and indoor/outdoor

connecting wire and 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/cm

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

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

valve. (See Photo 8.)

2

(0 MPa).

Photo 6

Defrost
thermistor

Photo 7

Screws of the outdoor fan motor

37

Propeller

Photo 8

Welded parts of 4-way valve

13

PARTS LIST (non-RoHS compliant)

MUZ-HA25VA MUZ-HA35VA

13-1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS

1(W)

15

17

16(W)

13

14 12

11

10

9

3

2

WThis picture shows MUZ-HA35.

13-2. OUTDOOR UNIT ELECTRICAL PARTS

1

4

5

6

9

3

7

8

8

7

6

5

42

38

REACTOR
POWER P.C. BOARD
R.V. COIL
THERMISTOR SET
FUSE HOLDER
FUSE
TERMINAL BLOCK
TERMINAL BLOCK
INVERTER P.C. BOARD
INVERTER P.C. BOARD
FUSE
VARISTOR
VARISTOR

E02 838 337
E02 A89 444
E02 928 490
E02 927 306
E02 735 241
E02 735 382
E02 573 375
E02 927 374
E02 A89 451
E02 A90 451
E02 127 382
E02 661 385
E02 927 385

1
2
3
4
5
6
7
8

9

10
11
12

Symbol

in Wiring

Diagram

Q'ty/unit

DEFROST, DISCHARGE

T20AL250V
3P
3P
Including heat sink and RT64
Including heat sink and RT64
T3.15AL250V

Remarks

Part No.

No.

Part Name

L61

21S4

RT61,RT62

F61
TB1
TB2

F71,F801
NR62,NR63,NR64

1
1
1
1
1
1
1
1
1

1
1
1

1
1
1
1
1
1
1
1

1
1
1
1

MUZ-HA25VA- E1MUZ-HA35VA-

E1

PARTS LIST (non-RoHS compliant)

MUZ-HA25VA MUZ-HA35VA

13-1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS

Part numbers that are circled are not shown in the illustration.

Part No.

No.

E02 927 232

1

E02 A89 232
E02 927 521

2

E02 931 501

3

E02 A89 290

4

E02 A45 290
E02 928 900

5

E02 927 900
E02 065 506

6

E02 927 661

7

E02 927 662

8

E02 927 245

9

E02 927 233

10

E02 931 961

11

E02 899 523

12

E02 838 523
E02 927 293

13

E02 899 515

14

E02 927 297

15

E02 A90 630

16

E02 A89 630
E02 A89 301

17

E02 096 936
E02 156 936

18

E02 A89 936
E02 891 642

19

Part Name

CABINET
CABINET
GRILLE
PROPELLER
BASE
BASE
COMPRESSOR
COMPRESSOR
COMPRESSOR RUBBER SET
STOP VALVE (GAS)
STOP VALVE (LIQUID)
SERVICE PANEL
BACK PANEL
4-WAY VALVE
CONDENSER NET
CONDENSER NET
SEPARATOR
MOTOR SUPPORT
TOP PANEL
OUTDOOR HEAT EXCHANGER
OUTDOOR HEAT EXCHANGER
OUTDOOR FAN MOTOR
CAPILLARY TUBE
CAPILLARY TUBE
CAPILLARY TUBE
CHECK VALVE

Symbol

in Wiring

Diagram

MC
MC

MF

MUZ-HA25VA- E1MUZ-HA35VA-

1
1
1
1

1

3
1
1
1
1
1
1

1
1
1

1
1
1

1
1

Q'ty/unit

1

1
1

1

1
3
1
1
1
1
1

1
1
1
1
1

1

1
1
1

Remarks

E1

KNB065FDTH
KNB073FDVH
3RUBBERS/SET

{9.52
{6.35

RA6V21­{3.0O

1.4O800

{3.0O

1.4O500

{3.0O

1.4O235

13-2. OUTDOOR UNIT ELECTRICAL PARTS

Part numbers that are circled are not shown in the illustration.

39

PARTS LIST (non-RoHS compliant)

MUZ-HA25VA MUZ-HA35VA
13-3. DRAIN SOCKET

1

40

PARTS LIST (non-RoHS compliant)

MUZ-HA25VA MUZ-HA35VA
13-3. DRAIN SOCKET

Parts No. Parts Name

No.

1

E02 838 704

DRAIN SOCKET

Symbol

in Wiring

Diagram

MUZ-HA25VA-

11

Q'ty/unit

E1

MUZ-HA35VA-

E1

Remarks

41

14

RoHS PARTS LIST (RoHS compliant)

MUZ-HA25VA MUZ-HA35VA

14-1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS

1(W)

15

16(W)

17

13

14 12

11

10

9

3

2

WThis picture shows MUZ-HA35.

14-2. OUTDOOR UNIT ELECTRICAL PARTS

1

4

5

6

9

3

7

8

8

7

6

5

42

42

REACTOR
POWER P.C. BOARD
R.V. COIL
THERMISTOR SET
FUSE HOLDER
FUSE
TERMINAL BLOCK
TERMINAL BLOCK
INVERTER P.C. BOARD
INVERTER P.C. BOARD
FUSE
VARISTOR
VARISTOR

E12 838 337
E12 A89 444
E12 928 490
E12 927 306
E12 735 241
E12 735 382
E12 573 375
E12 927 374
E12 A89 451
E12 A90 451
E12 127 382
E12 661 385
E12 927 385

1
2
3
4
5
6
7
8

9

10
11
12

G
G
G
G
G
G
G
G
G
G

G
11
12

Symbol

in Wiring

Diagram

Q'ty/unit

DEFROST, DISCHARGE

T20AL250V
3P
3P
Including heat sink and RT64
Including heat sink and RT64
T3.15AL250V

Remarks

Part No.

No.

Part Name

L61

21S4

RT61,RT62

F61
TB1
TB2

F71,F801
NR62,NR63,NR64

1
1
1
1
1
1
1
1
1

1
1
1

1
1
1
1
1
1
1
1

1
1
1
1

MUZ-HA25VA- E1MUZ-HA35VA-

E1

RoHS

RoHS PARTS LIST (RoHS compliant)

MUZ-HA25VA MUZ-HA35VA

14-1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS

Part numbers that are circled are not shown in the illustration.

No.

1
2

3
4

5
6

7
8

9
10
11

12
13

14
15

16
17

18

19

Part No.

RoHS

E12 927 232

G

E12 A89 232

G

E12 927 521

G

E12 931 501

G

E12 A89 290

G

E12 A45 290

G

E12 928 900

G

E12 927 900

G

E12 065 506

G

E12 927 661

G

E12 927 662

G

E12 927 245

G

E12 927 233

G

E12 931 961

G

E12 899 523

G

E12 838 523

G

E12 927 293

G

E12 899 515

G

E12 927 297

G

E12 A90 630

G

E12 A89 630

G

E12 A89 301

G

E12 096 936

G

E12 156 936

G

E12 A89 936

G

E12 891 642

G

Part Name

CABINET
CABINET
GRILLE
PROPELLER
BASE
BASE
COMPRESSOR
COMPRESSOR
COMPRESSOR RUBBER SET
STOP VALVE (GAS)
STOP VALVE (LIQUID)
SERVICE PANEL
BACK PANEL
4-WAY VALVE
CONDENSER NET
CONDENSER NET
SEPARATOR
MOTOR SUPPORT
TOP PANEL
OUTDOOR HEAT EXCHANGER
OUTDOOR HEAT EXCHANGER
OUTDOOR FAN MOTOR
CAPILLARY TUBE
CAPILLARY TUBE
CAPILLARY TUBE
CHECK VALVE

Symbol

in Wiring

Diagram

MC
MC

MF

MUZ-HA25VA- E1MUZ-HA35VA-

1
1
1
1

1

3
1
1
1
1
1
1

1
1
1

1
1
1

1
1

Q'ty/unit

1

1
1

1

1
3
1
1
1
1
1

1
1
1
1
1

1

1
1
1

Remarks

E1

KNB065FDTH
KNB073FDVH
3RUBBERS/SET

{9.52
{6.35

RA6V21-

{3.0O1.4O800
{3.0O1.4O500
{3.0O1.4O235

14-2. OUTDOOR UNIT ELECTRICAL PARTS

Part numbers that are circled are not shown in the illustration.

43

Symbol

in Wiring

Diagram

Q'ty/unit

Remarks

Parts No. Parts Name

MUZ-HA25VA-

E1

MUZ-HA35VA-

E1

E12 838 704

1G

DRAIN SOCKET

No.

11

RoHS

RoHS PARTS LIST (RoHS compliant)

MUZ-HA25VA MUZ-HA35VA
14-3. DRAIN SOCKET

CC

Copyright 2006 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD
Distributed in Apr. 2006. No. OB453 6
Made in Japan

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New publication, effective Apr. 2006
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