Mitsubishi MUH-GD80VB-E1 Service Manual

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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

OUTDOOR UNIT

SERVICE MANUAL

Wireless type Model

MUH-GD80VB -

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.

TECHNICAL CHANGES

MUH-GD80VB -

1. New model

PART NAMES AND FUNCTIONS

MUH-GD80VB

Air inlet

(back and side)

ACCESSORIES

Drain socket

Drain cap 33

Drain cap 16

Air outlet

MUH-GD80VB

—

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

MUH-GD80VB

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

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

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

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

OUTDOOR UNIT

MICROPHONE

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

OUTLINES AND DIMENSIONS

MUH-GD80VB

330

850

430

299

515

121

500 840

REQUIRED SPACE

100 mm or more

360

Open as a rule

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

155

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

WIRING DIAGRAM

MUH-GD80VB

REFRIGERANT SYSTEM DIAGRAM

MUH-GD80VB

Refrigerant pipe 15.88 (with heat insulator)

Stop valve (with service port)

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

Piping size O.D: mm

Gas

15.88

MAX. HEIGHT DIFFERENCE

Indoor unit

Max. Height

difference

ADDITIONAL REFRIGERANT CHARGE (R410A: g)

Model

Outdoor unit

precharged

Refrigerant piping length (one way)

Liquid

Max. length

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)

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)

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

MUH-GD80VB

38.4

35.5

32.5

29.6

26.6

23.6

20.7

17.7

Indoor air Dry-bulb temperature

Indoor intake air Dry-bulb temperature (°C)

Outdoor intake air Wet-bulb temperature (°C)

NOTE: The above curves are for the heating operation without any frost.

MUH-GD80VB

OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation

Both indoor and outdoor unit are under the same temperature/humidity condition.

Dry-bulb temperature

20 25 30

Air flow should be set at MAX. The unit of pressure has been changed to MPa on the international system of units (SI unit system).

The conversion factor is: 1(MPa [Gauge]) = 10.2 (kgf/ [Gauge])

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

Outdoor low pressure

15 20

Ambient temperature (˚C) Ambient humidity (%)

Relative humidity(%)

50 60 70

MUH-GD80VB

25 60

30 35

70 (%)

230 V

MUH-GD80VB

Outdoor unit current(A)

15 20

Ambient temperature (˚C) Ambient humidity (%)

25 60

230 V

30 35

70 (%)

HEAT operation

Condition indoor: Dry bulb temperature 20.0°C Wet bulb temperature 14.5°C

Outdoor: Dry bulb temperature 7,15, 20°C Wet bulb temperature 6,12, 14.5°C

MUH-GD80VB

230 V

Outdoor unit current(A)

5 10152025

Ambient temperature (˚C)

PERFORMANCE DATA COOL operation

MSH-GD80VB: MUH-GD80VB (230V)

CAPACITY : 8.0(kW) SHF : 0.62 INPUT : 3320(W)

OUTDOOR DB(°C)

INDOOR INDOOR DB(°C) WB(°C)

21 18 9.40 4.14 0.44 2656 9.00 3.96 0.44 2789 8.64 3.80 0.44 2922 8.32 3.66 0.44 3054 21 20 9.80 3.14 0.32 2789 9.40 3.01 0.32 2955 9.12 2.92 0.32 3021 8.80 2.82 0.32 3154 22 18 9.40 4.51 0.48 2656 9.00 4.32 0.48 2789 8.64 4.15 0.48 2922 8.32 3.99 0.48 3054 22 20 9.80 3.53 0.36 2789 9.40 3.38 0.36 2955 9.12 3.28 0.36 3021 8.80 3.17 0.36 3154 22 22 10.20 2.45 0.24 2888 9.84 2.36 0.24 3071 9.60 2.30 0.24 3154 9.20 2.21 0.24 3287 23 18 9.40 4.89 0.52 2656 9.00 4.68 0.52 2789 8.64 4.49 0.52 2922 8.32 4.33 0.52 3054 23 20 9.80 3.92 0.40 2789 9.40 3.76 0.40 2955 9.12 3.65 0.40 3021 8.80 3.52 0.40 3154 23 22 10.20 2.86 0.28 2888 9.84 2.76 0.28 3071 9.60 2.69 0.28 3154 9.20 2.58 0.28 3287 24 18 9.40 5.26 0.56 2656 9.00 5.04 0.56 2789 8.64 4.84 0.56 2922 8.32 4.66 0.56 3054 24 20 9.80 4.31 0.44 2789 9.40 4.14 0.44 2955 9.12 4.01 0.44 3021 8.80 3.87 0.44 3154 24 22 10.20 3.26 0.32 2888 9.84 3.15 0.32 3071 9.60 3.07 0.32 3154 9.20 2.94 0.32 3287 24 24 10.72 2.14 0.20 3021 10.32 2.06 0.20 3187 10.08 2.02 0.20 3287 9.76 1.95 0.20 3453 25 18 9.40 5.64 0.60 2656 9.00 5.40 0.60 2789 8.64 5.18 0.60 2922 8.32 4.99 0.60 3054 25 20 9.80 4.70 0.48 2789 9.40 4.51 0.48 2955 9.12 4.38 0.48 3021 8.80 4.22 0.48 3154 25 22 10.20 3.67 0.36 2888 9.84 3.54 0.36 3071 9.60 3.46 0.36 3154 9.20 3.31 0.36 3287 25 24 10.72 2.57 0.24 3021 10.32 2.48 0.24 3187 10.08 2.42 0.24 3287 9.76 2.34 0.24 3453 26 18 9.40 6.02 0.64 2656 9.00 5.76 0.64 2789 8.64 5.53 0.64 2922 8.32 5.32 0.64 3054 26 20 9.80 5.10 0.52 2789 9.40 4.89 0.52 2955 9.12 4.74 0.52 3021 8.80 4.58 0.52 3154 26 22 10.20 4.08 0.40 2888 9.84 3.94 0.40 3071 9.60 3.84 0.40 3154 9.20 3.68 0.40 3287 26 24 10.72 3.00 0.28 3021 10.32 2.89 0.28 3187 10.08 2.82 0.28 3287 9.76 2.73 0.28 3453 26 26 11.04 1.77 0.16 3187 10.72 1.72 0.16 3353 10.56 1.69 0.16 3453 10.24 1.64 0.16 3552 27 18 9.40 6.39 0.68 2656 9.00 6.12 0.68 2789 8.64 5.88 0.68 2922 8.32 5.66 0.68 3054 27 20 9.80 5.49 0.56 2789 9.40 5.26 0.56 2955 9.12 5.11 0.56 3021 8.80 4.93 0.56 3154 27 22 10.20 4.49 0.44 2888 9.84 4.33 0.44 3071 9.60 4.22 0.44 3154 9.20 4.05 0.44 3287 27 24 10.72 3.43 0.32 3021 10.32 3.30 0.32 3187 10.08 3.23 0.32 3287 9.76 3.12 0.32 3453 27 26 11.04 2.21 0.20 3187 10.72 2.14 0.20 3353 10.56 2.11 0.20 3453 10.24 2.05 0.20 3552 28 18 9.40 6.77 0.72 2656 9.00 6.48 0.72 2789 8.64 6.22 0.72 2922 8.32 5.99 0.72 3054 28 20 9.80 5.88 0.60 2789 9.40 5.64 0.60 2955 9.12 5.47 0.60 3021 8.80 5.28 0.60 3154 28 22 10.20 4.90 0.48 2888 9.84 4.72 0.48 3071 9.60 4.61 0.48 3154 9.20 4.42 0.48 3287 28 24 10.72 3.86 0.36 3021 10.32 3.72 0.36 3187 10.08 3.63 0.36 3287 9.76 3.51 0.36 3453 28 26 11.04 2.65 0.24 3187 10.72 2.57 0.24 3353 10.56 2.53 0.24 3453 10.24 2.46 0.24 3552 29 18 9.40 7.14 0.76 2656 9.00 6.84 0.76 2789 8.64 6.57 0.76 2922 8.32 6.32 0.76 3054 29 20 9.80 6.27 0.64 2789 9.40 6.02 0.64 2955 9.12 5.84 0.64 3021 8.80 5.63 0.64 3154 29 22 10.20 5.30 0.52 2888 9.84 5.12 0.52 3071 9.60 4.99 0.52 3154 9.20 4.78 0.52 3287 29 24 10.72 4.29 0.40 3021 10.32 4.13 0.40 3187 10.08 4.03 0.40 3287 9.76 3.90 0.40 3453 29 26 11.04 3.09 0.28 3187 10.72 3.00 0.28 3353 10.56 2.96 0.28 3453 10.24 2.87 0.28 3552 30 18 9.40 7.52 0.80 2656 9.00 7.20 0.80 2789 8.64 6.91 0.80 2922 8.32 6.66 0.80 3054 30 20 9.80 6.66 0.68 2789 9.40 6.39 0.68 2955 9.12 6.20 0.68 3021 8.80 5.98 0.68 3154 30 22 10.20 5.71 0.56 2888 9.84 5.51 0.56 3071 9.60 5.38 0.56 3154 9.20 5.15 0.56 3287 30 24 10.72 4.72 0.44 3021 10.32 4.54 0.44 3187 10.08 4.44 0.44 3287 9.76 4.29 0.44 3453 30 26 11.04 3.53 0.32 3187 10.72 3.43 0.32 3353 10.56 3.38 0.32 3453 10.24 3.28 0.32 3552 31 18 9.40 7.90 0.84 2656 9.00 7.56 0.84 2789 8.64 7.26 0.84 2922 8.32 6.99 0.84 3054 31 20 9.80 7.06 0.72 2789 9.40 6.77 0.72 2955 9.12 6.57 0.72 3021 8.80 6.34 0.72 3154 31 22 10.20 6.12 0.60 2888 9.84 5.90 0.60 3071 9.60 5.76 0.60 3154 9.20 5.52 0.60 3287 31 24 10.72 5.15 0.48 3021 10.32 4.95 0.48 3187 10.08 4.84 0.48 3287 9.76 4.68 0.48 3453 31 26 11.04 3.97 0.36 3187 10.72 3.86 0.36 3353 10.56 3.80 0.36 3453 10.24 3.69 0.36 3552 32 18 9.40 8.27 0.88 2656 9.00 7.92 0.88 2789 8.64 7.60 0.88 2922 8.32 7.32 0.88 3054 32 20 9.80 7.45 0.76 2789 9.40 7.14 0.76 2955 9.12 6.93 0.76 3021 8.80 6.69 0.76 3154 32 22 10.20 6.53 0.64 2888 9.84 6.30 0.64 3071 9.60 6.14 0.64 3154 9.20 5.89 0.64 3287 32 24 10.72 5.57 0.52 3021 10.32 5.37 0.52 3187 10.08 5.24 0.52 3287 9.76 5.08 0.52 3453 32 26 11.04 4.42 0.40 3187 10.72 4.29 0.40 3353 10.56 4.22 0.40 3453 10.24 4.10 0.40 3552

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

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

21 25 27 30

PERFORMANCE DATA COOL operation

MSH-GD80VB: MUH-GD80VB (230V)

CAPACITY : 8.0(kW) SHF : 0.62 INPUT : 3320(W)

INDOOR INDOOR DB(°C) WB(°C)

21 18 7.84 3.45 0.44 3254 7.20 3.17 0.44 3453 6.92 3.04 0.44 3519 21 20 8.24 2.64 0.32 3386 7.68 2.46 0.32 3552 7.40 2.37 0.32 3652 22 18 7.84 3.76 0.48 3254 7.20 3.46 0.48 3453 6.92 3.32 0.48 3519 22 20 8.24 2.97 0.36 3386 7.68 2.76 0.36 3552 7.40 2.66 0.36 3652 22 22 8.72 2.09 0.24 3519 8.16 1.96 0.24 3718 7.88 1.89 0.24 3785 23 18 7.84 4.08 0.52 3254 7.20 3.74 0.52 3453 6.92 3.60 0.52 3519 23 20 8.24 3.30 0.40 3386 7.68 3.07 0.40 3552 7.40 2.96 0.40 3652 23 22 8.72 2.44 0.28 3519 8.16 2.28 0.28 3718 7.88 2.21 0.28 3785 24 18 7.84 4.39 0.56 3254 7.20 4.03 0.56 3453 6.92 3.88 0.56 3519 24 20 8.24 3.63 0.44 3386 7.68 3.38 0.44 3552 7.40 3.26 0.44 3652 24 22 8.72 2.79 0.32 3519 8.16 2.61 0.32 3718 7.88 2.52 0.32 3785 24 24 9.20 1.84 0.20 3652 8.64 1.73 0.20 3818 8.40 1.68 0.20 3901 25 18 7.84 4.70 0.60 3254 7.20 4.32 0.60 3453 6.92 4.15 0.60 3519 25 20 8.24 3.96 0.48 3386 7.68 3.69 0.48 3552 7.40 3.55 0.48 3652 25 22 8.72 3.14 0.36 3519 8.16 2.94 0.36 3718 7.88 2.84 0.36 3785 25 24 9.20 2.21 0.24 3652 8.64 2.07 0.24 3818 8.40 2.02 0.24 3901 26 18 7.84 5.02 0.64 3254 7.20 4.61 0.64 3453 6.92 4.43 0.64 3519 26 20 8.24 4.28 0.52 3386 7.68 3.99 0.52 3552 7.40 3.85 0.52 3652 26 22 8.72 3.49 0.40 3519 8.16 3.26 0.40 3718 7.88 3.15 0.40 3785 26 24 9.20 2.58 0.28 3652 8.64 2.42 0.28 3818 8.40 2.35 0.28 3901 26 26 9.68 1.55 0.16 3785 9.12 1.46 0.16 3951 8.84 1.41 0.16 4034 27 18 7.84 5.33 0.68 3254 7.20 4.90 0.68 3453 6.92 4.71 0.68 3519 27 20 8.24 4.61 0.56 3386 7.68 4.30 0.56 3552 7.40 4.14 0.56 3652 27 22 8.72 3.84 0.44 3519 8.16 3.59 0.44 3718 7.88 3.47 0.44 3785 27 24 9.20 2.94 0.32 3652 8.64 2.76 0.32 3818 8.40 2.69 0.32 3901 27 26 9.68 1.94 0.20 3785 9.12 1.82 0.20 3951 8.84 1.77 0.20 4034 28 18 7.84 5.64 0.72 3254 7.20 5.18 0.72 3453 6.92 4.98 0.72 3519 28 20 8.24 4.94 0.60 3386 7.68 4.61 0.60 3552 7.40 4.44 0.60 3652 28 22 8.72 4.19 0.48 3519 8.16 3.92 0.48 3718 7.88 3.78 0.48 3785 28 24 9.20 3.31 0.36 3652 8.64 3.11 0.36 3818 8.40 3.02 0.36 3901 28 26 9.68 2.32 0.24 3785 9.12 2.19 0.24 3951 8.84 2.12 0.24 4034 29 18 7.84 5.96 0.76 3254 7.20 5.47 0.76 3453 6.92 5.26 0.76 3519 29 20 8.24 5.27 0.64 3386 7.68 4.92 0.64 3552 7.40 4.74 0.64 3652 29 22 8.72 4.53 0.52 3519 8.16 4.24 0.52 3718 7.88 4.10 0.52 3785 29 24 9.20 3.68 0.40 3652 8.64 3.46 0.40 3818 8.40 3.36 0.40 3901 29 26 9.68 2.71 0.28 3785 9.12 2.55 0.28 3951 8.84 2.48 0.28 4034 30 18 7.84 6.27 0.80 3254 7.20 5.76 0.80 3453 6.92 5.54 0.80 3519 30 20 8.24 5.60 0.68 3386 7.68 5.22 0.68 3552 7.40 5.03 0.68 3652 30 22 8.72 4.88 0.56 3519 8.16 4.57 0.56 3718 7.88 4.41 0.56 3785 30 24 9.20 4.05 0.44 3652 8.64 3.80 0.44 3818 8.40 3.70 0.44 3901 30 26 9.68 3.10 0.32 3785 9.12 2.92 0.32 3951 8.84 2.83 0.32 4034 31 18 7.84 6.59 0.84 3254 7.20 6.05 0.84 3453 6.92 5.81 0.84 3519 31 20 8.24 5.93 0.72 3386 7.68 5.53 0.72 3552 7.40 5.33 0.72 3652 31 22 8.72 5.23 0.60 3519 8.16 4.90 0.60 3718 7.88 4.73 0.60 3785 31 24 9.20 4.42 0.48 3652 8.64 4.15 0.48 3818 8.40 4.03 0.48 3901 31 26 9.68 3.48 0.36 3785 9.12 3.28 0.36 3951 8.84 3.18 0.36 4034 32 18 7.84 6.90 0.88 3254 7.20 6.34 0.88 3453 6.92 6.09 0.88 3519 32 20 8.24 6.26 0.76 3386 7.68 5.84 0.76 3552 7.40 5.62 0.76 3652 32 22 8.72 5.58 0.64 3519 8.16 5.22 0.64 3718 7.88 5.04 0.64 3785 32 24 9.20 4.78 0.52 3652 8.64 4.49 0.52 3818 8.40 4.37 0.52 3901 32 26 9.68 3.87 0.40 3785 9.12 3.65 0.40 3951 8.84 3.54 0.40 4034

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

35 40 43

OUTDOOR DB(°C)

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

PERFORMANCE DATA HEAT operation

MSH-GD80VB: MUH-GD80VB (230V)

CAPACITY : 9.4(kW) INPUT : 3580(W)

OUTDOOR WB(°C)

INDOOR DB(°C)

15 5.92 2327 7.14 2792 8.37 3150 9.59 3401 10.81 3616 11.94 3723 13.16 3795

21 5.64 2506 6.77 2971 7.99 3294 9.12 3544 10.34 3723 11.47 3831 12.64 3974

26 5.08 2685 6.30 3150 7.43 3473 8.65 3723 9.87 3902 11.00 4010 12.22 4117

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

-10 -5 0 5 10 15 20

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

ACTUATOR CONTROL

MUH-GD80VB

9-1. R.V. COIL CONTROL

SERVICE FUNCTIONS

MUH-GD80VB

10-1. COMPULSORY DEFROSTING MODE FOR SERVICE

By short circuit of the connector JPG1 and R871 on the outdoor deicer P.C. board, defrosting mode can be accomplished regardless of the defrost interval restriction. (Refer to 11-4.) Defrost thermistor RT61 must read below -3°C.

10-2. CHANGE IN DEFROST SETTING

<JRF> When the JRF wire of the deicer P.C. board is cut, the defrost interval time will be changed. <JRG> When the JRG wire of the deicer P.C. board is cut, the defrost temperature will be changed. (Refer to 11-4.)

Model Change point

MUH-GD80VB

TROUBLESHOOTING

Jumper wire

JRF

JRG

Defrost interval time changes from 40 minutes to 15 minutes.

Defrost start temperature does not change.(-3.0 ) Defrost finish temperature changes from 13 to 15 .

MUH-GD80VB

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 con-

firming 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 electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the com-

ponents.

(4) 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 OPERATION INDICATOR lamp is flashing ON and OFF before starting serv-

ice work. (2) Before servicing check that the connector and terminal are connected properly. (3) If the electronic control P.C. board seems to be defective, check the copper foil pattern for disconnection and the compo-

nents for bursting and discoloration.

Housing point

11-2. TROUBLE CRITERION OF MAIN PARTS

MUH-GD80VB

Part name FigureCheck method and criterion

Measure the resistance with a tester.

Defrost thermistor (RT61)

Discharge temperature thermistor (RT62)

Ambient temperature thermistor (RT63)

Compressor (MC)

INNER PROTECTOR 160± 5°C OPEN 90±10°C CLOSE

(Part temperature –10°C ~ 40°C)

Refer to 11-4. "Test point diagram and voltage", "Outdoor deicer P.C. board", the chart of thermistor.

Measure the resistance with a tester. Before measurement, hold the thermistor with your hands to warm it up. (Part temperature 0°C ~ 40°C)

Refer to 11-4. "Test point diagram and voltage", "Outdoor deicer P.C. board", the chart of thermistor.

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

Refer to 11-4. "Test point diagram and voltage", "Outdoor deicer P.C. board", the chart of thermistor.

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

Terminal

C – R C – S

Normal

0.56 Ω ~ 0.71 Ω

1.43 Ω ~ 1.76 Ω

WHT

AUX.

RED

MAIN

BLK

Outdoor fan motor (MF)

INNER PROTECTOR 135± 5°C OPEN ( 83±15°C CLOSE )

R.V. coil (21S4)

LEV (Expansion valve)

Reference value

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

Color of

lead wire

WHT – BLK

BLK – YLW

YLW – RED

Normal

55 Ω ~ 68 Ω 49 Ω ~ 61 Ω 22 Ω ~ 29 Ω

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

Normal

2.673 kΩ ~ 3.268 kΩ

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

Color of lead wire

Normal WHT – RED RED – ORN

YLW – BRN

41.0 Ω ~ 49.0 Ω

BRN – BLU

MAIN

AUX.1AUX.2

REDORN WHT

BLK

YLW

LEV

: INNER PROTECTOR

11-3. TROUBLESHOOTING FLOW

Compressor and/or outdoor fan motor doesn’t operate.

Check of outdoor unit

Turn ON the power supply.

Is there 230 V AC to between on the outdoor terminal block

Yes

Check the outdoor power supply

Compressor does not operate.

Is there 5 V DC between J101 - J401 on the deicer

P.C. board?

Operate the unit in COOL or HEAT mode by pressing the EMERGENCY OPERATION switch.

3 minutes after the power supply turns ON, is there 230 V AC between A1-A2 on the compressor contactor (52C)?

Is there 230 V AC between 2/T1 on the compressor contactor (52C) and on the outdoor terminal block?

Check the compressor. Refer to 11-2.

and connection of wiring.

Yes

Replace the deicer P.C. board.

Replace the compressor contactor (52C).

Yes

Rectify the connecting wire.

Outdoor fan motor does not operate.

Is there 5 V DC between J101 - J401 on the deicer

P.C. board?

Yes

Operate the unit in COOL or HEAT mode by pressing the EMERGENCY OPERATION switch.

Yes

Check the outdoor fan motor. Refer to 11-2.

Yes

Replace the deicer P.C. board.

Rectify the connecting wire.

Compressor and/or outdoor fan motor doesn’t stop.

Check of outdoor unit

Turn OFF the power supply. After 30 seconds, turn ON the power supply again. Operate the unit in COOL or HEAT mode by pressing the EMERGENCY OPERATION switch. Operate the unit for 1 minute or more and stop it by pressing the EMERGENCY OPERATION switch again.

After 30 seconds, does compressor stop?

After 30 seconds, does outdoor fan motor stop?

Check of R.V. coil

Yes

Is there 230 V AC between

A1-A2 on the compressor contactor (52C)?

Replace the deicer P.C. board.

Yes

Is there 230 V AC between

2/T1 on the compressor contactor (52C) and on the

outdoor terminal block?

Replace the compressor contactor (52C).

Yes

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

First, measure the resistance of R.V. coil to confirm it is disconnected or is not short-circuit.

Disconnect the TAB52 on the deicer P.C. board. Turn ON the power supply and operate the indoor unit in COOL mode by pressing the EMERGENCY OPERATION switch.

After 3 minutes, does the unit operate in HEAT mode?

Yes

Is there 230 V AC between CN721 – on the deicer P.C. board?

Yes

Replace the deicer P.C. board.

Replace the R.V. coil.

Rectify the connecting wire.

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

First, measure the resistance of R.V. coil to confirm it is disconnected or is not short-circuit.

Disconnect the TAB52 on the deicer P.C. board. Turn ON the power supply and operate the indoor unit in HEAT mode by pressing the EMERGENCY OPERATION switch.

After 3 minutes, does the unit operate in COOL mode?

Yes

Is there 230 V AC between CN721 – on the deicer P.C. board?

Yes

Replace the R.V. coil.

Replace the deicer P.C. board

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

How to check mis-wiring

• Turn ON the power supply. (indoor/outdoor unit)

• Press EMERGENCY OPERATION switch once.

After 3 minutes, mis-wiring is indicated (0.5-second ON, 0.5-second OFF) on OPERATION INDICATOR lamp on indoor unit.

Correct them.

1. Turn OFF the power supply (indoor/outdoor unit) and disconnect indoor/outdoor connecting wire on indoor side.

2. Short-circuit terminal block - by lead wire. Turn ON the power supply (indoor unit) and press EMERGENCY OPERATION switch once.

Yes

Is this mis-wiring, poor contact, or wire disconnection?

Is there 20 V DC between both ends of R132 on the indoor electronic control P.C. board ? ( By tester, the stylus is between 0 ~ 20 V. )

• Turn OFF the power supply. (indoor unit)

• Connect indoor/outdoor connecting wire.

Start

Yes

Short circuit of JPG and JPS on the indoor electronic control P.C. board enables self -check to be displayed in 3 seconds.

Replace the indoor electronic control P.C. board.

Turn ON the power supply. (outdoor unit)

Is there 230 V AC between on the outdoor terminal block?

Yes

Is there 5 V DC between J101 + -J401 - on the deicer P.C. board?(Refer to 11-4.)

Yes

During EMERGENCY OPERATION, is there 10 V DC between both ends of R601 on the deicer P.C. board? (Refer to 11-4.) (By tester, the stylus is between 5 ~10 V.)

Yes

Replace the deicer P.C. board.

Check the outdoor power supply and connection of wiring.

Replace the deicer P.C. board.

Make the wiring between CN730 on the deicer P.C. board and outdoor terminal block correct. (Refer to 11-4.)

Refer to indoor unit service manual.

When OPERATION INDICATOR lamp flashes 10-time. Heating/Cooling doesn't operate.

Check of LEV (Expansion valve)

Turn ON the power supply. During pressing both the OPERATION SELECT button and the TOO COOL button on the remote controller at the same time, press the RESET button. First, release the RESET button. And release the other two buttons since all LCD in operation display section of the remote controller is displayed after 3 seconds.

With remote controller set toward the indoor unit, press OPERATE/STOP (ON/OFF) button and confirm one beep tone.

LEV operates in full-opening direction.

CLOCK

°C

AMPM

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

Is LEV properly fixed to the expansion valve?

Yes

Does the resistance of LEV have the characteristics on 11-2?

Replace the LEV.

Yes

Properly fix the LEV to the expansion valve.

Replace the deicer P.C. board.

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

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

2. Press the RESET button on the remote controller.

When OPERATION INDICATOR lamp flashes 6-time. Thermistors in the outdoor unit are abnormal.

Check of outdoor thermistor

Disconnect the connectors CN661 and/or CN662 from the deicer P.C. board.

(Check the characteristics of each thermistor.)

Defrost thermistor(RT61)

Measure resistance between CN661 and .

Turn OFF the power supply.

Discharge temperature thermistor(RT62)

Measure resistance between CN662 and .

Ambient temperature thermistor(RT63)

Measure resistance between CN662 and .

Does the resistance of thermistor have the characteristics on 11-4?

Replace the thermistor.

Connect CN661 and CN662. Turn ON the power

Yes

supply and press the EMERGENCY OPERATION switch.

Replace the deicer P.C.

board.

Does the unit operate 10 minutes or more?

Yes

OK .

It probably had contact failure of the connectors.

11-4. TEST POINT DIAGRAM AND VOLTAGE

MUH-GD80VB Outdoor deicer P.C. board

Defrost thermistor (RT61)

Ambient temperature thermistor (RT63)

100

Resistance (kΩ)

-20 -10 0 10 20 30 40 Temperature (°C)

Discharge temperature thermistor (RT62)

900

800

700

600

500

400

300

Resistance (kΩ)

200

100

0 102030405060708090100110120

Temperature (°C)

Defrost

interval time short pin(JPG1, R871)

(Refer to

10-1.)

J101 5 V DC

J401

(Refer to 11-3. or 11-3. .)

CN661 Defrost thermistor (RT61) (Refer to 11-3. )

}

CN662 Discharge temperature thermistor (RT62)

(Refer to 11-3. )

CN662 Ambient temperature thermistor (RT63)

(Refer to 11-3.

)

LEV connector (CN724)

Fan motor connector (CN711)

Varistor (NR62)

R.V. coil

}

(CN721)

12 V DC

}

Fuse T3.15AL250V

Varistor (NR61)

CN730 -

}

230 V AC

(Refer to 11-3. 11-3.

or .)

Jumper wire for change in defrost setting (JRF, JRG) (Refer to 10-2.)

}

R601 10 V DC (Refer to 11-3. .)

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

Locking lever

MUH-GD80VB

OPERATING PROCEDURE

1.Removing the cabinet

(1) Remove the screws of the service panel. (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover. (4) Remove the service panel. (5) Remove the top panel. (6) Remove the valve cover. (7) Remove the screws of the cabinet. (8) Remove the cabinet. (9) Remove the screws of the back panel. (10)

Remove the back panel.

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

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

Hold the sleeve, and pull out the terminal slowly.

Connector

PHOTOS

Photo 1

Screws of the cabinet

Screw of the top panel

Photo 3

Screws of the back panel

Screw of the motor support

Screws of the back panel

Screws of the cabinet

Photo 2

Screw of the service panel

Screws of the top panel

Screws of the cabinet

Screw of the valve cover

OPERATING PROCEDURE

PHOTOS

2. Removing the deicer P.C. board

(1) Remove the service panel and the cabinet. (2) Disconnect all the connectors and the terminals on the

deicer P.C. board.

(3) Remove the deicer P.C. board.

3. Removing the propeller and the outdoor fan motor

(1) Remove the cabinet. (Refer to 1.) (2) Remove the propeller nut and the propeller.

NOTE: Loose the propeller in the rotating direction for removal.

When attaching the propeller, align the mark on the propeller and the motor shaft cut section. Set the propeller fan in position by using the cut on

the shaft and the mark on the propeller. (3) Remove the clamp of outdoor fan motor lead wire and disconnect the outdoor fan motor connector. (4) Remove the screws fixing the outdoor fan motor. (5) Remove the outdoor fan motor.

Photo 4

Screws of the relay panel

Photo 5

Propeller

nut

Propeller

Deicer P.C. board

Screws of the relay panel

Screws of the outdoor fan motor

Terminal

blocks

4. Removing the compressor

(1) Remove the cabinet. (Refer to 1.) (2) Remove the relay panel. (3) Remove the soundproof felt. (4) Remove the terminal cover on the compressor. (5) Disconnect lead wires from the compressor. (6) Recover gas from the refrigerant circuit.

NOTE:

Recover gas from the pipes until the pressure gauge shows 0 kg/cm (7) Disconnect the welded part of the discharge pipe. (8) Disconnect the welded part of the suction pipe. (9) Remove nuts fixing the compressor.

(10)

(0 MPa).

Remove the compressor.

Screws of the outdoor fan motor

Photo 6

Discharge pipe

Suction pipe

Terminal cover

Compressor nuts

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

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

Mitsubishi MUH-GD80VB-E1 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual