Mitsubishi MUZ-HC25VA-E1, MUZ-HC35VA-E1, MUZ-HC35VA-E2, MUZ-HC35VAB-E1, MUZ-HC35VAB-E2 Service Manual

SPLIT-TYPE AIR CONDITIONERS

OUTDOOR UNIT

Revision B:

• MUZ-HC35VA-E2 and MUZ-HC35VAB-E2 have
been added.

Please void OBH467 REVISED EDITION-A.

SERVICE MANUAL

Models

MUZ-HC25VA ­MUZ-HC35VA ­MUZ-HC35VA ­MUZ-HC35VAB ­MUZ-HC35VAB -

E1

E1

E2

E1

E2

HFC

utilized

R410A

Indoor unit service manual
MSZ-HC•VA Series (OBH466)
MSZ-CHC•VA Series (OBH522)

No. OBH467

REVISED EDITION-B

NOTE:

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

CONTENTS

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

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

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

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

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

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

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

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

9. ACTUATOR CONTROL ··································· 24

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

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

12. DISASSEMBLY INSTRUCTIONS ···················· 40

PARTS CATALOG (OBB467)

Revision A:

•Table “ADDITIONAL REFRIGERANT CHARGE” of “7.

REFRIGERANT SYSTEM DIAGRAM

Revision B:

• MUZ-HC35VA-E2 and MUZ-HC35VAB-E2 have been added.

” has been corrected.

2

1

TECHNICAL CHANGES

MUZ-HA25VA -E1 → MUZ-HC25VA ­MUZ-HA35VA -E1 → MUZ-HC35VA ­MUZ-HA35VA -E1 → MUZ-HC35VAB -

1. Outdoor model has been changed.

MUZ-HC35VA -E1 → MUZ-HC35VA ­MUZ-HC35VAB -E1 → MUZ-HC35VAB -

1. REFRIGERANT SYSTEM has been changed.

E1

E1

E1

E2

E2

3

2

PART NAMES AND FUNCTIONS

MUZ-HC25VA MUZ-HC35VA MUZ-HC35VAB

Air inlet

Piping

Drain hose

Air outlet

Drain outlet

ACCESSORIES

Drain socket 1

4

3

Breaker capacity A 10
Running current 1 (Total) A 3.7 4.2 4.8 4.8 5.3 4.8
Power input 1 (Total) W 770 880 980 995 1130 995
Power factor
Starting current 1 (Total) A 4.2 4.8 5.3

Electrical data

Coeffi cient of performance (C.O.P)

Compressor

Fan motor

Dehumidifi cation /h 1.4 - 2.0 - 2.0 -
Air fl ow 1 m3/h 1,812 1,788 1,800 1,776 1,800 1,776
Sound level 1 dB(A) 46 47 47 48 47 48
Fan speed rpm 810 800 800 790 800 790
Fan speed regulator 1
Refrigerant fi lling capacity (R410A) kg 0.73 0.75

Special remarks

Refrigeration oil (Model) NEO22

NOTE: Test conditions are based on ISO 5151.
Cooling: Indoor Dry-bulb temperature 27°C Wet-bulb temperature 19°C
Outdoor Dry-bulb temperature 35°C
Heating: Indoor Dry-bulb temperature 20°C
Outdoor Dry-bulb temperature 7°C Wet-bulb temperature 6°C
Refrigerant piping length (one way): 5 m
1 Measured under rated operating frequency.

SPECIFICATION

Outdoor model MUZ-HC25VA MUZ-HC35VA MUZ-HC35VAB

Function Cooling Heating Cooling Heating Cooling Heating

Power supply Single phase 230 V, 50 Hz

Rated frequency (Min.-Max.)

Capacity

1 (Total) % 90 91 89 90 93 90

Model KNB065FDTH(C)

Output W 500 550
Current
Model RA6V21-AB or BB or BD
Current 1 A 0.24

Dimensions W × H × D mm 684 × 540 × 255

1 A 3.24 3.74 4.34 4.34 4.84 4.34

Weight kg 25

kW

1 (Total) 3.25 3.64 3.21 3.62 3.01 3.62

2.5

(0.9-3.0)

3.2

(0.9-4.4)

3.15

(1.0-3.7)

E1

E2

3.6

(0.9-4.8)

KNB073FEDH
KNB073FGDH

KNB073FGDHC

3.4

(1.0-3.7)

3.6

(0.9-4.8)

5

Specifi cations and rating conditions of main electric parts

Item

Model

MUZ-HC25

MUZ-HC35VA-

MUZ-HC35VAB-

E1

E1

MUZ-HC35VA-

MUZ-HC35VAB-

Current transformer (CT) 20 A

Smoothing capacitor (C61, C62) 500 μF 420 V
Diode module

(DB61) 15 A 600 V

(DB65) 10 A 600 V

Fuse

(F61) T20AL250V

(F701, F801) T3.15AL250V

Intelligent power module (IPM) 10 A 600 V

Expansion valve coil (LEV) — DC 12 V

Reactor (L61) 18 mH 7 A

Current-detecting resistor

(R61) 45 mΩ 5 W

(R825) 25 mΩ 5 W

Current-limiting PTC thermistor (PTC64) 33 Ω

Terminal block (TB1,TB2) 3 P
Relay

(X61) 5 A 250 V

(X63) 3 A 250 V

(X64) 20 A 250 V

R.V. coil (21S4) SHF-4-10W5

Outdoor fan motor thermal fuse Open 152°C (RA6V21-AB) or Open 126°C (RA6V21-BB or BD)
IGBT (TR821) 30 A 600 V

E2

E2

6

4

NOISE CRITERIA CURVES

MUZ-HC25VA

FUNCTION

COOLING
HEATING

90

80

70

60

50

40

30

APPROXIMATE

20

THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

10

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

SPL(dB(A)) LINE

46
47

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

MUZ-HC35VA

FUNCTION

COOLING

HEATING

90

80

70

60

50

40

30

APPROXIMATE

20

THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

10

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

SPL(dB(A))

47
48

LINE

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

MUZ-HC35VAB

FUNCTION

COOLING

HEATING

90

80

70

60

50

40

30

APPROXIMATE

20

THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

10

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

SPL(dB(A))

47
48

LINE

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

Test conditions
Cooling : Dry-bulb temperature 35°C

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

OUTDOOR UNIT

1m

MICROPHONE

7

5

OUTLINES AND DIMENSIONS

MUZ-HC25VA MUZ-HC35VA MUZ-HC35VAB

381.5

Air in

540

17.5

Handle

Air in

Air out

Drain hole

2 holes 10 × 16

33

ø

40

47.5

Bolt pitch for

22.5

264-280

installation

REQUIRED SPACE

100 mm or more

300

255

20.8

144.6

89.6

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

100 mm or more

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

Service panel

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

40°

43°

Unit : mm

100 mm or more

350 mm or more

270

10

61

243

105

Bolt pitch for installation

500

684

Service port

145.5

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

8

6

MUZ-HC25VA MUZ-HC35VA-

WIRING DIAGRAM

E1

MUZ-HC35VAB-

E1

9

MUZ-HC35VA-

E2

MUZ-HC35VAB-

E2

10

7

REFRIGERANT SYSTEM DIAGRAM

MUZ-HC25VA MUZ-HC35VA-

E1

MUZ-HC35VAB-

E1

Unit : mm

Refrigerant pipe ø9.52
(with heat insulator)

Flared connection

Flared connection

Refrigerant pipe ø6.35
(with heat insulator)

Muffler

Stop valve
(with service port)

Stop valve
(with strainer)

4-way valve

Discharge
temperature
thermistor
RT62

Capillary tube

ø

3.0 × ø1.4 × 450 (HC25)

ø

3.0 × ø1.4 × 235 (HC35)

Check

Capillary tube

valve

ø
ø

Muffler

Compressor

Defrost
thermistor
RT61

3.0 × ø1.4 × 800 (HC25)

3.0 × ø1.4 × 600 (HC35)

Refrigerant flow in cooling
Refrigerant flow in heating

Outdoor
heat
exchanger

Strainer

R.V. coil
heating ON
cooling OFF

MUZ-HC35VA-

Refrigerant pipe ø9.52
(with heat insulator)

Refrigerant pipe ø6.35
(with heat insulator)

E2

MUZ-HC35VAB-

Flared connection

Flared connection

E2

Muffler

Stop valve
(with service port)

Capillary tube

ø

3.0 × ø2.0 × 260

Stop valve
(with strainer)

4-way valve

Discharge
temperature
thermistor
RT62

LEV

Muffler

Compressor

Refrigerant flow in cooling
Refrigerant flow in heating

Outdoor
heat
exchanger

Defrost
thermistor
RT61

Strainer
#100

R.V. coil
heating ON
cooling OFF

11

MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE

MUZ-HC25VA
MUZ-HC35VA
MUZ-HC35VAB

Refrigerant piping: m

Max. Length

A

Max. Height difference

B

10 5 9.52 6.35

Indoor
unit

Max. Height

difference

B

Max. Length
A

Outdoor unit

Piping size O.D: mm

Gas Liquid

ADDITIONAL REFRIGERANT CHARGE (R410A : g)

Model

Outdoor unit

precharged

5 m 6 m 7 m 8 m 9 m 10 m

MUZ-HC25VA
MUZ-HC35VA

1,150

0 0 0 90 120 150

MUZ-HC35VAB

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

Refrigerant piping length (one way)

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

12

PERFORMANCE CURVES8

MUZ-HC25VA MUZ-HC35VA MUZ-HC35VAB

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
(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

OUTDOOR UNIT

Wet and dry-bulb
thermometers

13

8-1. CAPACITY AND INPUT CURVES

7.9

9.8

7.3

9.0

6.7

8.3

6.1

7.5

5.5

6.8

5.0

6.1

difference (degree)

4.4

5.4

Indoor air Wet-bulb temperature

at Rated frequency

MUZ-HC25VA

8.3

6.7

7.5

6.1

6.8

5.5

6.1

5.0

5.4

4.4

difference (degree)

Indoor air Wet-bulb temperature

3.9

4.8

10.8

9.9

9.1

8.2

7.4

6.7

5.9

at Rated frequency

at Rated frequency

MUZ-HC35VAB

MUZ-HC35VA

9.1

8.2

7.4

6.7

5.9

5.2

1.5

1.4

1.3

1.2

1.1

1.0

0.9

Capacity correction factor

Indoor intake air Wet-bulb temperature (°C)

18 20 25 30 35 40 43

Outdoor intake air Dry-bulb temperature (°C)

1.3

1.2

1.1

Cooling capacity

Total input (cooling)

26

24

26

24

1.0

0.9

0.8

Input correction factor

Indoor intake air Wet-bulb temperature (°C)

18 20 25 30 35 40 43

Outdoor intake air Dry-bulb temperature (°C)

22
20
18

22
20
18

at Rated frequency

MUZ-HC25VA

22.4

20.5

20.7

18.9

19.0

17.4

17.2

15.8

15.5

14.2

13.8

12.6

12.1

11.0

difference (degree)

Indoor air Wet-bulb temperature

10.3

9.5

at Rated frequency

MUZ-HC25VA

at Rated frequency

MUZ-HC35VA

MUZ-HC35VA

at Rated frequency

MUZ-HC35VAB

22.4

20.7

19.0

17.2

15.5

13.8

12.1

10.3

at Rated frequency

at Rated frequency

MUZ-HC35VAB

(°C)

ure

mperat

Indoor intake air Dry-bulb temperature (°C)

Indoor intake air Dry-bulb te

Outdoor intake air Wet-bulb temperature (°C)

Outdoor intake air Wet-bulb temperature (°C)

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

14