Mitsubishi MUH-GD80VB-E1 Service Manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

OUTDOOR UNIT

SERVICE MANUAL

Wireless type
Model

MUH-GD80VB -

E1

CONTENTS

HFC

utilized

R410A

Indoor unit service manual
MSH-GD•VB Series (OBH513)

No. OBH514

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

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

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

4. NOISE CRITERIA CURVES ······························ 3

5. OUTLINES AND DIMENSIONS ························ 4

6. WIRING DIAGRAM ············································ 4

7. REFRIGERANT SYSTEM DIAGRAM ··············· 5

8. PERFORMANCE CURVES ······························· 6

9. ACTUA TOR CONTROL ··································· 10

10. SERVICE FUNCTIONS ·····································11

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

12. DISASSEMBLY INSTRUCTIONS ···················· 18

PARTS CATALOG (OBB514)

NOTE:

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

1

TECHNICAL CHANGES

MUH-GD80VB -

1. New model

2

PART NAMES AND FUNCTIONS

MUH-GD80VB

E1

Air inlet

(back and side)

ACCESSORIES

Drain socket

Drain cap 33

Drain cap 16

Air outlet

MUH-GD80VB

1

2

—

2

3

SPECIFICATION

Outdoor model MUH-GD80VB
Function Cooling Heating

Power supply

Single phase
230 V, 50 Hz

Capacity kW 8.0 9.4

Breaker capacity A 25
Running current (Total)
Power input (Total) W 3,320 3,580

data

Power factor (Total) % 98

Electrical

Starting current (Total)

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

A 14.76 15.90

A90

2.41 2.63
Model NN37VAAHT
Output W 2,500

Compressor

Compressor motor current

A 13.85 14.62

Model RA6V75-AD

Fan

Fan motor current A 0.57

motor

Dimensions W H

D mm 840 850 330

Weight kg 77

Dehumidifi cation /h 4.6
Air fl ow

(High/Low)
Sound level (High/Low)
Fan speed (High/Low)
Fan speed regulator 2

Special

remarks

Refrigerant fi lling
capacity (R410A)

/h 2,940/1,470

dB 55/53

rpm 805/435

kg 2.40

-

Refrigeration oil (Model) NEO 22

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 Wet-bulb temperature 24°C
Heating: Indoor Dry-bulb temperature 20°C Wet-bulb temperature 15.5°C
Outdoor Dry-bulb temperature 7°C Wet-bulb temperature 6°C
Indoor-Outdoor piping length: 5 m

4

MUH-GD80VB

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

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

90

80

70

60

50

40

30

20

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

10

NOISE CRITERIA CURVES

FAN SPEED

High

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

SPL(dB(A)) LINE

55

OUTDOOR UNIT

1m

MICROPHONE

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

3

5

OUTLINES AND DIMENSIONS

MUH-GD80VB

51

34

330

850

430

66

299

515

121

500
840

40

REQUIRED SPACE

100 mm or more

360

Open as a rule

80

500 mm or more if the back,
both sides and top are open

155

90

198

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

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

350 mm or more

Service panel

Liquid refrigerant
pipe joint
Refrigerant pipe
(flared) 9.52

30º

35º

Gas refrigerant
pipe joint
Refrigerant pipe
(flared) 15.88

Unit: mm

6

WIRING DIAGRAM

MUH-GD80VB

4

7

REFRIGERANT SYSTEM DIAGRAM

MUH-GD80VB

Refrigerant pipe 15.88
(with heat insulator)

Stop valve
(with service port)

Flared connection

Flared connection

Receiver

Stop valve

Refrigerant pipe 9.52
(with heat insulator)

MAX. REFRIGERANT PIPING LENGTH

4-way valve

Muffler

Strainer

#100

Capillary tube

3.6 2.4 50

Muffler

#100

Discharge
temperature
thermistor
RT62

Compressor

LEV

Defrost
thermistor
RT61

Strainer

#100

Unit: mm

Outdoor
heat
exchanger

Ambient
temperature
thermistor
RT63

R.V. coil
heating ON
cooling OFF

Refrigerant flow in cooling
Refrigerant flow in heating

Model

MUH-GD80VB

Refrigerant piping: m

Max. length AMax. height

30

B

15

Piping size O.D: mm

Gas

15.88

MAX. HEIGHT DIFFERENCE

Indoor
unit

Max. Height

difference

B

ADDITIONAL REFRIGERANT CHARGE (R410A: g)

Model

Outdoor unit

precharged

Refrigerant piping length (one way)

Liquid

Max. length

A

15 m10 m7 m

9.52

20 m

Outdoor unit

25 m 30 m

MUH-GD80VB

2,400

0 165 440 715 990 1,265

Calculation: Xg = 55 g/m (Refrigerant piping length (m) - 7)

5

8

PERFORMANCE CURVES

MUH-GD80VB

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: °CWB
(2) Indoor outlet air wet-bulb temperature: °CWB
(3) Outdoor intake air dry-bulb temperature: °CDB
(4) Total input: W
(5) Indoor intake air dry-bulb temperature: °CDB
(6) Outdoor intake air wet-bulb temperature: °CWB
(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

19.2

17.4

15.6

13.9

12.4

10.8

Indoor air Wet-bulb temperature

OUTDOOR UNIT

Wet and dry-bulb
thermometers

Indoor intake air Wet-bulb temperature (°C)

Indoor intake air Wet-bulb temperature (°C)

Outdoor intake air Dry-bulb temperature (°C) Outdoor intake air Dry-bulb temperature (°C)

MUH-GD80VB

6