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

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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

No. OB387

HFC

utilized

SERVICE MANUAL R410A

Wireless type

Models

MUH-GA20VB - E1

MUH-GA25VB - E1

MUH-GA35VB - E1

CONTENTS

Indication of

model name

MUH-GA20VB - E1 MUH-GA25VB - E1 MUH-GA35VB - E1

1.TECHNICAL CHANGES ················

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

3.SPECIFICATION····················

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

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

6.WIRING DIAGRAM ··················

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

8.PERFORMANCE CURVES ···············

9.SERVICE FUNCTIONS ·················

10.TROUBLESHOOTING·················

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

12.PARTS LIST······················

NOTE:

•This manual describes technical data of outdoor units.

•As for indoor units MSC-GA20/GA25/GA35VB - E1 , refer to the service manual OB385. •As for indoor units MSC-CA20/CA25/CA35VB - E1 , refer to the service manual OB393.

1 TECHNICAL CHANGES

MUH-A07YV- E1 MUH-GA20VB- E1

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

2.Dimension of outdoor unit has been changed. (780Wo540Ho255D 800Wo550Ho285D)

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- E1 MUH-GA25VB- E1

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

2.Dimension of outdoor unit has been changed. (780Wo540Ho255D 800Wo550Ho285D)

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- E1 MUH-GA35VB- E1

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

2.Dimension of outdoor unit has been changed. (780Wo540Ho255D 800Wo550Ho285D)

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.([12.7 [9.52)

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

2

Refrigerant

INFORMATION FOR THE AIR CONDITIONER WITH R410A REFRIGERANT

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 R410A refrigerant 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

Refrigeration

oil

 

New refrigerant

Previous refrigerant

Refrigerant

R410A

R22

 

 

 

Composition (Ratio)

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

R22 (100%)

 

 

 

Refrigerant handling

Pseudo-azeotropic refrigerant

Single refrigerant

 

 

 

Chlorine

Not included

Included

 

 

 

Safety group (ASHRAE)

A1/A1

A1

 

 

 

Molecular weight

72.6

86.5

 

 

 

Boiling point (:)

-51.4

-40.8

Steam pressure [25:](Mpa)

1.557

0.94

Saturated steam density [25:](Kg/K)

64

44.4

Combustibility

Non combustible

Non combustible

ODP w1

0

0.055

 

 

 

GWP w2

1730

1700

 

 

 

Refrigerant charge method

From liquid phase in cylinder

Gas phase

 

 

 

Additional charge on leakage

Possible

Possible

Kind

Incompatible oil

Compatible oil

 

 

 

Color

Non

Light yellow

 

 

 

Smell

Non

Non

 

 

 

w1 :Ozone Destruction Parameter

: based on CFC-11

w2 :Global Warmth Parameter

: based on CO2

Compressor

 

New Specification

Current Specification

The incompatible refrigeration oil easily separates from

Since refrigerant and refrigerating oil are compatible each,

refrigerant and is in the upper layer inside the suction muffler.

refrigeration oil goes back to the compressor through the

Raising position of the oil back hole enables to back the

lower position oil back hole.

refrigeration oil of the upper layer to flow back to the

 

 

 

 

 

 

 

compressor.

 

 

 

 

 

 

Suction muffler

 

 

 

 

 

 

Suction muffler

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Oil back hole

 

 

 

 

 

 

 

Compressor

 

 

 

 

 

 

Compressor

 

 

 

 

 

 

 

 

 

 

Refrigeration oil

 

 

 

 

 

 

Oil back hole

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Refrigeration oil /Refrigerant

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/f [Gauge])

3

Conversion chart of refrigerant temperature and pressure

(MPa [Gauge])

 

 

 

 

 

 

 

 

 

 

 

 

 

4.0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

pressure

 

 

 

 

 

R410A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3.0

 

 

 

 

 

R22

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

liquid

2.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Saturated

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

-0.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

-30 -20

-10 0 10 20 30 40 50 60

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/f [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.

R410A tools

Can R22 tools be used?

Description

 

 

R410A has high pressures beyond the measurement range of existing

Gauge manifold

No

gauges. Port diameters have been changed to prevent any other refrigerant

 

 

from being charged into the unit.

 

 

 

Charge hose

No

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

resistance.

 

 

Gas leak detector

No

Dedicated for HFC refrigerant.

 

 

 

Torque wrench

Yes

6.35 mm and 9.52 mm

 

 

 

Flare tool

Yes

Clamp bar hole has been enlarged to reinforce the spring strength in the tool.

 

 

 

Flare gauge

New

Provided for flaring work (to be used with R22 flare tool).

 

 

 

Vacuum pump

New

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

adapter

vacuum pumps.

 

Electronic scale for

New

It is difficult to measure R410A with a charging cylinder because the

refrigerant charging

refrigerant bubbles due to high pressure and high-speed vaporization

 

 

 

 

No : Not Substitutable for R410A Yes : Substitutable for R410A

2.Refrigerant piping

1Specifications

Use the refrigerant pipes that meet the following specifications.

Pipe

Outside diameter

Wall

Insulation material

 

mm

thickness

 

 

 

 

 

 

For liquid

6.35

0.8 mm

Heat resisting foam plastic

For gas

9.52

0.8 mm

Specific gravity 0.045 Thickness 8 mm

 

 

 

 

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.

4

2Flaring work and flare nut

Flaring work for R410A pipe differs from that for R22 pipe.

For details of flaring work, refer to Installation manual “FLARING WORK”.

Pipe diameter

Dimension of flare nut

 

mm

R410A

R22

6.35

17

17

9.52

22

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.

Indoor unit

Refrigerant gas cylinder operating valve

Union

 

Stop valve

Liquid pipe

 

Gas pipe

Outdoor unit

Service port

Gauge manifold valve (for R410A)

Charge hose (for R410A)

Refrigerant gas cylinder for R410A with siphon

Refrigerant (liquid)

Electronic scale for refrigerant charging

5

2 PART NAMES AND FUNCTIONS

OUTDOOR UNIT

ACCESSORIES

MUH-GA20VB - E1 MUH-GA25VB - E1 MUH-GA35VB - E1

MUH-GA20VB- E1

MUH-GA25VB- E1

MUH-GA35VB- E1

Air inlet

)

 

 

back : MUH-GA20VB

<Outdoor unit: MUH type>

 

( back and side : MUH-GA25VB

1 Drain socket

1

MUH-GA35VB

 

 

 

Piping

 

 

 

Drain hose

 

 

 

Air outlet

 

 

 

Drain outlet

3 SPECIFICATION

 

 

Outdoor model

 

MUH-GA20VB - E1

 

 

Outdoor unit power supply

Single phase

 

 

230V,50Hz

 

 

 

 

 

 

Function

 

Cooling

 

Heating

Capacity

Capacity

kW

2.3

 

2.5

Outdoor air flow

K /h

0.9

1800

 

 

Dehumidification

R/h

 

 

 

Power outlet

A

 

10

 

 

Running current

A

3.00

 

2.86

Electrical

 

Power input

W

680

 

655

data

Auxiliary heater

A(kW)

 

 

 

 

 

 

Power factor

%

99

 

100

 

 

Starting current

A

 

21

 

 

Compressor motor current

A

2.76

 

2.62

 

 

Fan motor current

A

 

0.25

 

 

 

 

3.22

 

3.62

 

Coefficient of performance (C.O.P)

 

Compressor

Model

 

RN092VHSHT

resistance (at 20:)

W

C-S 6.14

 

 

Output

 

600

 

 

Winding

"

C-R 3.87

 

 

 

 

 

 

Fan

motor

Model

 

RA6V21-AD

 

Winding

"

WHT-BLK 366

 

 

 

 

 

resistance (at 20:)

 

BLK-RED 274

 

 

Dimensions WOHOD

mm

800o550o285

 

 

Weight

kg

 

32

 

 

Sound level

dB

 

47

 

remarks

Fan speed

rpm

 

745

Special

Fan speed regulator

 

 

1

capacity (R410A)

 

 

 

 

 

 

Refrigerant filling

kg

 

0.65

 

 

 

 

 

 

Refrigeration oil (Model)

cc

350

(NEO22)

 

 

Thermistor RT61 (at 0:)

k"

33.18

 

 

NOTE: Test conditions are based on ISO 5151.

 

 

Cooling : Indoor

DB27°C WB19°C

 

 

 

 

Outdoor DB35°C WB24°C

 

 

 

 

Indoor-Outdoor piping length : 5m

 

 

MUH-GA25VB - E1

 

MUH-GA35VB - E1

Single phase

 

Single phase

230V,50Hz

 

230V,50Hz

Cooling

 

Heating

 

Cooling

 

Heating

2.65

 

3.0

 

3.5

 

3.7

1.1

 

 

1.7

 

 

1902

 

1902

 

 

10

 

10

 

3.43

 

3.43

 

4.65

 

4.34

785

 

785

 

1,050

 

980

 

 

 

100

 

100

 

98

 

98

 

22

 

27

 

3.10

 

3.10

 

4.32

 

4.01

 

0.33

 

0.33

 

3.23

 

3.66

 

3.21

 

3.63

RN104VHSHT

 

RN135VHSHT

 

700

 

900

 

C-R 3.40

 

C-R 2.79

C-S 4.56

 

C-S 3.36

RA6V33-KB

 

RA6V33-KB

WHT-BLK 215

 

WHT-BLK 215

BLK-RED 307

 

BLK-RED 307

800o550o285

 

800o550o285

 

32

 

35

 

 

49

 

49

 

 

855

 

855

 

 

1

 

1

 

 

0.80

 

0.80

 

350 (NEO22)

 

620 (NEO22)

 

33.18

 

33.18

 

Heating : Indoor

DB20°C

 

 

 

Outdoor

DB 7°C/WB 6°C

 

6

4 NOISE CRITERIA CURVES

MUH-GA20VB-

E1

 

FUNCTION

SPL(dB(A))

LINE

 

COOLING

 

 

 

 

 

 

 

 

HEATING

47

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Test conditions,

 

 

 

 

 

 

 

Cooling :DB35:

WB24:

 

90

 

 

 

 

Heating :DB 7:

WB 6:

 

 

 

 

 

 

 

 

 

MICRO BAR

80

 

 

 

 

 

 

 

 

70

 

 

 

 

 

 

 

 

dB re 0.0002

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NC-70

60

 

 

 

 

 

 

 

 

LEVEL,

 

 

 

 

 

 

 

 

NC-60

 

 

 

 

 

 

 

 

 

PRESSURE

50

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NC-50

 

 

 

 

 

 

 

 

 

BAND SOUND

40

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NC-40

30

 

 

 

 

 

 

 

 

OCTAVE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NC-30

 

 

 

 

 

 

 

 

 

 

20

APPROXIMATE

 

 

 

 

 

 

 

 

TERESHOLD OF

 

 

 

 

 

 

 

 

HEARING FOR

 

 

 

 

 

NC-20

 

 

CONTINUOUS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NOISE

 

 

 

 

 

 

 

 

10

63

125

250

500

1000

2000

4000

8000

 

 

BAND CENTER FREQUENCIES, Hz

MUH-GA25VB-

E1

 

FUNCTION

SPL(dB(A))

LINE

 

 

 

 

 

MUH-GA35VB-

E1

 

COOLING

49

 

 

HEATING

 

 

 

 

 

 

 

 

 

Test conditions,

 

 

 

 

 

 

 

 

Cooling :DB35:

WB24:

 

90

 

 

 

 

Heating :DB 7:

WB 6:

 

 

 

 

 

 

 

 

 

MICRO BAR

80

 

 

 

 

 

 

 

 

70

 

 

 

 

 

 

 

 

dB re 0.0002

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NC-70

60

 

 

 

 

 

 

 

 

LEVEL,

 

 

 

 

 

 

 

 

NC-60

 

 

 

 

 

 

 

 

 

PRESSURE

50

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NC-50

 

 

 

 

 

 

 

 

 

BAND SOUND

40

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NC-40

30

 

 

 

 

 

 

 

 

OCTAVE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NC-30

 

 

 

 

 

 

 

 

 

 

20

APPROXIMATE

 

 

 

 

 

 

 

 

TERESHOLD OF

 

 

 

 

 

 

 

 

HEARING FOR

 

 

 

 

 

NC-20

 

 

CONTINUOUS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NOISE

 

 

 

 

 

 

 

 

10

63

125

250

500

1000

2000

4000

8000

 

 

BAND CENTER FREQUENCIES, Hz

OUTDOORUNIT

1m

MICROPHONE

7

5 OUTLINES AND DIMENSIONS

MUH-GA20VB - E1 MUH-GA25VB - E1 MUH-GA35VB - E1

Unit: mm

OUTDOOR UNIT

 

 

REQUIRED SPACE

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

344.5

285

550

400

Drain hole [42

Air in

 

44 Air in (MUH-GA25 /GA35VB)

2 holes 10X21

40

 

Air out

22.3

Handle

280 10

150

302.5

500 Bolt pitch for installation

800

Bolt forpitchinstallation304~325

17.5 23

 

 

 

 

or

more

 

 

 

 

 

 

 

 

 

100mm

 

 

 

100mm

 

 

 

or

 

 

 

 

 

 

 

 

 

 

 

 

 

 

more

 

 

 

 

 

 

 

 

or

more

 

350mm

or

more

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

200mm

 

 

 

 

 

 

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

Service panel

 

 

 

Liquid refrigerant pipe joint

 

 

 

Refrigerant pipe (flared) [6.35

 

 

 

-

-

 

 

 

35

43

 

164.5

 

Gas refrigerant pipe joint

 

 

 

 

 

 

Refrigerant pipe (flared) [9.52

69

 

99.5

170.5

 

 

 

 

 

 

 

 

 

 

 

Service port

 

8

6 WIRING DIAGRAM

MUH-GA20VB - E1

MUH-GA25VB - E1 MUH-GA35VB - E1

 

MODELS WIRING DIAGRAM

OUTDOOR UNIT

 

 

TO INDOOR UNIT CONNECTING 12V

POWER SUPPLY ~/N 230V 50Hz

SYMBOL

NAME

 

 

 

RT61

21S4

 

 

 

 

 

TB2

 

 

 

 

 

 

 

 

RED

 

1

CN661

CN721

 

 

 

 

 

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3 2

CN730

SR62

 

1

 

WHT

 

N

BLK

 

 

 

 

 

 

 

 

 

CN711

 

 

 

CIRCUIT

 

 

 

 

 

 

2

 

BLK

MF

 

DSAR

 

 

 

 

 

RED

BREAKER

BRN

F61

 

NR61

SR61

C653

 

TB1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L

 

 

 

T61

 

 

 

 

 

 

 

BLU

 

 

 

 

 

 

 

 

N

 

 

 

 

 

 

 

 

 

 

BRN

TAB20

 

52C

 

 

WHT

 

 

PE

 

 

 

 

 

 

 

 

 

 

 

 

 

GRN/YLW

 

 

4

3

 

 

 

C

 

 

 

 

 

 

 

 

 

 

 

BLU

 

 

 

 

RED

S

MC

R

 

 

 

 

 

 

 

 

 

 

 

 

C1

BLK

 

 

 

 

 

 

 

 

 

 

 

 

SYMBOL

 

NAME

 

SYMBOL

 

 

 

NAME

C1

COMPRESSOR CAPACITOR

MF

OUTDOOR FAN MOTOR

T61

TRANS FORMER

C65

OUTDOOR FAN CAPACITOR

(INNER FUSE)

TB1,TB2

TERMINAL BLOCK

 

 

 

 

 

 

 

DSAR

SURGE ABSORBER

NR61

VARISTOR

21S4

R.V. COIL

 

 

 

 

 

 

F61

FUSE(2A)

RT61

DEFROST THERMISTOR

52C

COMPRESSOR CONTACTOR

 

 

 

 

MC

COMPRESSOR(INNER PROTECTOR) SR61,SR62 SOLID STATE RELAY

 

 

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

9

+ 27 hidden pages