Pioneer MUH-GA20VB, MUH-GA25VB, MUH-GA35VB User Manual

SERVICE MANUAL

HFC

utilized

R410A

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

Wireless type Models

No. OB387

MUH-GA20VB MUH-GA25VB MUH-GA35VB -

Indication of model name

MUH-GA20VB MUH-GA25VB MUH-GA35VB -

CONTENTS

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

2. PART NAMES AND FUNCTIONS······················6

3. SPECIFICATION·················································6

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

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

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

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

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

9. SERVICE FUNCTIONS ····································22

10. TROUBLESHOOTING ······································22

11. DISASSEMBLY INSTRUCTIONS·····················29

12. PARTS LIST······················································32

NOTE:

•This manual describes technical data of outdoor units.

•As for indoor units MSC-GA20/GA25/GA35VB - , refer to the service manual OB385.

•As for indoor units MSC-CA20/CA25/CA35VB - , refer to the service manual OB393.

TECHNICAL CHANGES

MUH-A07YV- ➔MUH-GA20VB-

1. Indication of capacity has been changed. (BTU base ➔ kw)

2. Dimension of outdoor unit has been changed. (780W

3. Stop valve cover has been added.

4. Outdoor fan motor has been changed. (RC6V20-AB ➔ RA6V21-AD)

5. Outdoor fan motor capacitor has been changed.

6. Compressor capacitor has been changed.

7. Outdoor heat exchanger has been changed. (L-BEND ➔ FLAT)

MUH-A09YV- ➔MUH-GA25VB-

1. Indication of capacity has been changed. (BTU base ➔ kw)

2. Dimension of outdoor unit has been changed. (780Wo540Ho255D ➔ 800Wo 550Ho285D)

3. Stop valve cover has been added.

4. Outdoor fan motor has been changed. (RA6V33-FB ➔ RA6V33-KB)

5. Outdoor fan motor capacitor has been changed.

6. Compressor capacitor has been changed.

7. Outdoor heat exchanger has been changed. (2 Row ➔ 1 Row)

MUH-A12YV- ➔MUH-GA35VB-

1. Indication of capacity has been changed. (BTU base ➔ kw)

2. Dimension of outdoor unit has been changed. (780Wo540Ho255D ➔ 800Wo 550Ho285D)

3. Stop valve cover has been added.

4. Outdoor fan motor has been changed. (RA6V33-FB ➔ RA6V33-KB)

5. Outdoor fan motor capacitor has been changed.

6. Compressor capacitor has been changed.

7. Size of stop valve (gas) has been changed.(

8. Outdoor heat exchanger has been changed. (2 Row ➔ 1 Row)

E1E1

o540Ho255D ➔ 800Wo550Ho285D)

E1E1

[12.7 ➔ [9.52)

INFORMATION FOR THE AIR CONDITIONER WITH R410A REFRIGERANT

New Specification Current Specification

The incompatible refrigeration oil easily separates from refrigerant and is in the upper layer inside the suction muffler. Raising position of the oil back hole enables to back the refrigeration oil of the upper layer to flow back to the compressor.

Since refrigerant and refrigerating oil are compatible each, refrigeration oil goes back to the compressor through the lower position oil back hole.

Compressor

Suction muffler

Oil back hole

Refrigeration oil

Refrigerant

Compressor

Suction muffler

Oil back hole

Refrigeration oil /Refrigerant

Compressor

• This room air conditioner adopts HFC refrigerant (R410A) which never destroys the ozone layer.

• Pay particular attention to the following points, though the basic installation procedure is same as that for R22 conditioners.

1 As R410A has working pressure approximate 1.6 times as high as that of R22, some special tools and piping parts/

materials are required. Refer to the table below.

2 Take sufficient care not to allow water and other contaminations to enter the R410Arefrigerant during storage and

installation, since it is more susceptible to contaminations than R22.

3 For refrigerant piping, use clean, pressure-proof parts/materials specifically designed for R410A. (Refer to 2. Refrigerant

piping.)

4 Composition change may occur in R410A since it is a mixed refrigerant. When charging, charge liquid refrigerant to prevent

composition change.

Refrigerant Composition (Ratio) Refrigerant handling Chlorine Safety group (ASHRAE) Molecular weight Boiling point (:) Steam pressure [25:](Mpa)

Refrigerant

Saturated steam density [25:](Kg/K) Combustibility ODP w1 GWP w2 Refrigerant charge method Additional charge on leakage Kind Color

oil

Smell

Refrigeration

w1:Ozone Destruction Parameter : based on CFC-11 w2 :Global Warmth Parameter : based on CO

New refrigerant

R410A

HFC-32: HFC-125 (50%:50%)

Pseudo-azeotropic refrigerant

Not included

A1/A1

72.6

-51.4

1.557 64

Non combustible

1730

From liquid phase in cylinder

Possible

Incompatible oil

Non Non

Previous refrigerant

R22

R22 (100%)

Single refrigerant

Included

86.5

-40.8

0.94

44.4

Non combustible

0.055 1700

Gas phase

Possible

Compatible oil

Light yellow

Non

NOTE : The unit of pressure has been changed to MPa on the international system of units(SI unit system).

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

[Gauge])

Wall thickness

Outside diameter

Pipe

mm For liquid For gas

6.35

9.52

0.8 mm

Heat resisting foam plastic Specific gravity 0.045 Thickness 8 mm

Insulation material

-30 -20 -10 0 10 20

40 50 60

-0.5

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

(MPa [Gauge])

R410A R22

Conversion chart of refrigerant temperature and pressure

Saturated liquid pressure

(:)

NOTE : The unit of pressure has been changed to MPa on the

R410A tools Can R22 tools be used?

Gas leak detector

R410A has high pressures beyond the measurement range of existing gauges. Port diameters have been changed to prevent any other refrigerant from being charged into the unit.

Hose material and cap size have been changed to improve the pressure resistance.

Dedicated for HFC refrigerant.

6.35 mm and 9.52 mm

Description

Clamp bar hole has been enlarged to reinforce the spring strength in the tool. Provided for flaring work (to be used with R22 flare tool).

Provided to prevent the back flow of oil. This adapter enables you to use vacuum pumps.

It is difficult to measure R410A with a charging cylinder because the refrigerant bubbles due to high pressure and high-speed vaporization

Yes Yes

New

Gauge manifold

Charge hose

Torque wrench

Flare tool Flare gauge

Vacuum pump adapter

Electronic scale for refrigerant charging

No : Not Substitutable for R410A Yes : Substitutable for R410A

international system of units(SI unit system).

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

1.Tools dedicated for the air conditioner with R410A refrigerant

The following tools are required for R410A refrigerant. Some R22 tools can be substituted for R410A tools. The diameter of the service port on the stop valve in outdoor unit has been changed to prevent any other refrigerant being charged into the unit. Cap size has been changed from 7/16 UNF with 20 threads to 1/2 UNF with 20 threads.

2.Refrigerant piping

1 Specifications

Use the refrigerant pipes that meet the following specifications.

• Use a copper pipe or a copper-alloy seamless pipe with a thickness of 0.8 mm. Never use any pipe with a thickness less than 0.8mm, as the pressure resistance is insufficient.

2 Flaring work and flare nut

Electronic scale for refrigerant charging

Outdoor unit

Refrigerant gas cylinder operating valve

Refrigerant gas cylinder for R410A with siphon

Refrigerant (liquid)

Service port

Gauge manifold valve (for R410A)

Union

Liquid pipe Gas pipe

Stop valve

Indoor unit

Charge hose (for R410A)

Flaring work for R410A pipe differs from that for R22 pipe. For details of flaring work, refer to Installation manual “FLARING WORK”.

Pipe diameter

6.35

9.52

Dimension of flare nut

R410A

17 22

R22

17 22

3.Refrigeration oil

Apply the special refrigeration oil (accessories: packed with indoor unit) to the flare and the union seat surfaces.

4.Air purge

• Do not discharge the refrigerant into the atmosphere. Take care not to discharge refrigerant into the atmosphere during installation, reinstallation, or repairs to the refrigerant

circuit.

• Use the vacuum pump for air purging for the purpose of environmental protection.

5.Additional charge

For additional charging, charge the refrigerant from liquid phase of the gas cylinder. If the refrigerant is charged from the gas phase, composition change may occur in the refrigerant inside the cylinder and the outdoor unit. In this case, ability of the refrigeration cycle decreases or normal operation can be impossible. However, charging the liquid refrigerant all at once may cause the compressor to be locked. Thus, charge the refrigerant slowly.

( )

Air inlet

Air outlet

Drain outlet

Piping

Drain hose

back : MUH-GA20VB back and side : MUH-GA25VB MUH-GA35VB

Capacity Dehumidification Outdoor air flow Power outlet Running current Power input Auxiliary heater Power factor Starting current Compressor motor current Fan motor current

Model Output Winding resistance (at 20:) Model Winding resistance (at 20:) Dimensions WOHOD Weight Sound level Fan speed Fan speed regulator Refrigerant filling capacity (R410A) Refrigeration oil (Model) Thermistor RT61 (at 0:)

R/h

K /h

A A

A(kW)

A A A

rpm

kg cc

MUH-GA20VB -

Single phase

230V,50Hz

1800

—

0.25

RN092VHSHT

600 C-R 3.87 C-S 6.14

RA6V21-AD

WHT-BLK 366

BLK-RED 274 800o550o285

32 47

745

0.65

350 (NEO22)

33.18

Cooling

2.3

0.9

3.00 680

2.76

3.22

Heating

2.5 —

2.86 655

100

2.62

3.62

MUH-GA25VB - E1

Single phase

230V,50Hz

1902

—

0.33

RN104VHSHT

700

C-R 3.40

C-S 4.56

RA6V33-KB WHT-BLK 215 BLK-RED 307 800o550o285

32 49

855

0.80

350 (NEO22)

33.18

Cooling

2.65

1.1

3.43 785

100

3.10

3.23

Heating

3.0 —

3.43 785

100

3.10

3.66

MUH-GA35VB -

Single phase

230V,50Hz

1902

—

0.33

RN135VHSHT

900 C-R 2.79 C-S 3.36

RA6V33-KB

WHT-BLK 215

BLK-RED 307 800o550o285

35 49

855

0.80

620 (NEO22)

33.18

Cooling

3.5

1.7

4.65

1,050

4.32

3.21

Heating

3.7 —

4.34 980

4.01

3.63

Compressor

Electrical

data

Fan

motor

Special

remarks

Capacity

Coefficient of performance (C.O.P)

Outdoor unit power supply

Function

Outdoor model

PART NAMES AND FUNCTIONS

OUTDOOR UNIT

MUH-GA20VB MUH-GA25VB MUH-GA35VB -

SPECIFICATION

ACCESSORIES

MUH-GA20VBMUH-GA25VBMUH-GA35VB-

Drain socket

NOTE: Test conditions are based on ISO 5151.

Cooling : Indoor DB27°C WB19°C Heating : Indoor DB20°C Indoor-Outdoor piping length : 5m

Outdoor DB35°C WB24°C Outdoor DB 7°C/WB 6°C

63 125 250 500 1000 2000 4000 8000

APPROXIMATE TERESHOLD OF HEARING FOR CONTINUOUS NOISE

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 :DB35: WB24:

Heating :DB 7: WB 6:

MUH-GA25VB- E1 MUH-GA35VB- E1

COOLING

FUNCTION

HEATING

SPL(dB

(A)) LINE

OUTDOORUNIT

MICROPHONE

63 125 250 500 1000 2000 4000 8000

APPROXIMATE TERESHOLD OF HEARING FOR CONTINUOUS NOISE

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 :DB35: WB24: Heating :DB 7: WB 6:

MUH-GA20VB- E1

COOLING

FUNCTION

HEATING

SPL(dB

(A)) LINE

NOISE CRITERIA CURVES

800

302.5 500 Bolt pitch for installation

150

22.3

Handle

550

280

164.5

99.5

170.5

Service panel

Service port

285

344.5

400

Air in

Air out

Air in

17.5

Bolt pitch for

installation

304~325

Liquid refrigerant pipe joint Refrigerant pipe (flared) [6.35

Gas refrigerant pipe joint Refrigerant pipe (flared) [9.52

43-

35-

2 holes 10X21

(MUH-GA25

/GA35VB)

REQUIRED SPACE

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

350mm or more

200mm or more

100mm or more

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

Drain hole [42

OUTLINES AND DIMENSIONS

MUH-GA20VB - MUH-GA25VB - MUH-GA35VB -

OUTDOOR UNIT

E1E1E1

Unit: mm

SYMBOL

T61

TB1,TB2

21S4

52C

SYMBOL

NR61 RT61

SR61,SR62

SYMBOL

C65

DSAR

F61

NAME

NAME NAME COMPRESSOR CAPACITOR OUTDOOR FAN CAPACITOR SURGE ABSORBER FUSE(2A) COMPRESSOR(INNER PROTECTOR)

VARISTOR DEFROST THERMISTOR SOLID STATE RELAY

TRANS FORMER TERMINAL BLOCK R.V. COIL COMPRESSOR CONTACTOR

OUTDOOR FAN MOTOR (INNER FUSE)

TAB20

TB2

TB1

BRN

321

CN711

CN730

BLU

NR61

RT61

21S4

CN661

C65

123

SR61

SR62

CN721

T61

WHT

RED BLK

F61

BRN

DSAR

CIRCUIT BREAKER

BLU

POWER SUPPLY

~/N 230V 50Hz

12V

TO INDOOR

UNIT

CONNECTING

RED

BLK

GRN/YLW

52C

BLK

WHT

RED

WIRING DIAGRAM

MUH-GA20VB - MUH-GA25VB - MUH-GA35VB -

OUTDOOR UNIT

MODELS WIRING DIAGRAM

E1E1E1

NOTE:1. About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing.

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

3. Symbols below indicate.

/: Terminal block, : Connector

REFRIGERANT SYSTEM DIAGRAM

MUH-GA20VB - MUH-GA25VB - MUH-GA35VB -

OUTDOOR UNIT

Refrigerant pipe [ 9.52

(with heat insulator)

Flared connection

Refrigerant pipe [6.35

(with heat insulator)

Stop valve (with service port)

Strainer #100

Stop valve

4-way valve

Muffler

Capillary tube

[3.0x[1.4x700 (MUH-GA20VB) [3.0x[1.4x1000(MUH-GA25VB) [3.0x[1.4x500 (MUH-GA35VB)

Check valve

Capillary tube

[3.0x[1.4x500 (MUH-GA20VB) [3.0x[1.4x600 (MUH-GA25VB) [3.0x[1.4x300 (MUH-GA35VB)

E1E1E1

Defrost thermistor RT61

Compressor

Unit:mm

Outdoor heat exchanger

R.V. coil heating ON cooling OFF

Refrigerant flow in cooling Refrigerant flow in heating

MAX. REFRIGERANT PIPING LENGTH

Refrigerant piping

Model

Max. length : m

Piping size O.D : mm Length of connecting pipe : m

Gas

Liquid

Indoor unit

Outdoor unit

MUH-GA20VB - E1 MUH-GA25VB - E1

MUH-GA35VB - E1

9.52

MAX. HEIGHT DIFFERENCE

Indoor unit

Height difference should be within 10m regardless of which unit, indoor or outdoor position is high.

w Max. Height difference 10m

ADDITIONAL REFRIGERANT CHARGE(R410A : g)

Model

MUH-GA20VB - E1

Outdoor unit precharged

650

Gas 0.43

6.35 Liquid 0.5

Refrigerant Piping

Max.length

Refrigerant piping length (one way)

10m

15m

20m

Gas 0

Liquid 0

Outdoor unit

25m

MUH-GA25VB - E1

MUH-GA35VB - E1

PERFORMANCE CURVES

800

MUH-GA20VB - MUH-GA25VB - MUH-GA35VB -

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.

160

Calculation : Xg = 20g/m x (A-7)m

E1E1E1

260

360

(1) GUARANTEED VOLTAGE

198~264V

(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 chart on page 10 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.

Cooling

}

Heating

}

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