Mitsubishi MUX-A22WV-E1 Service Manual

SERVICE MANUAL

HFC

utilized

R410A

SPLIT-TYPE, AIR CONDITIONER

Multi system type Model

Revision A:

●MUX-A22WV - can be connected to MSC-A07/A12YV -

●PARTS LIST has partially modified.

Please void OB318.

No. OB318

REVISED EDITION-A

MUX-A22WV -

Indication of model name

NOTE:

•This manual describes technical data of outdoor unit.

•As for indoor unit MSC-A07WV - or MSC-A12WV - , refer to the service manual OB307 REVISED EDITION-C.

•As for indoor unit MSC-A07YV - or MSC-A12YV - , refer to the service manual OB329.

E1E1

CONTENTS

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

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

3. INDOOR / OUTDOOR CORRESPONDENCE TABLE ···························5

4. SPECIFICATION·················································5

5. NOISE CRITERIA CURVES·······························6

6. OUTLINES AND DIMENSIONS························ 6

7. WIRING DIAGRAM ············································7

8. REFRIGERANT SYSTEM DIAGRAM················8

9. PERFORMANCE CURVES································9

10. MICROPROCESSOR CONTROL ····················15

11. TROUBLESHOOTING ······································15

12. DISASSEMBLY INSTRUCTIONS·····················21

13. PARTS LIST······················································23

Refrigerating

oil

Refrigerant

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

Refrigerant Composition (Ratio) Refrigerant handling Chlorine Safety group (ASHRAE) Molecular weight Boiling point (:) Steam pressure [25:](Mpa) Saturated steam density [25:](Kg/K) Combustibility ODP w1 GWP w2 Refrigerant charge method Additional charge on leakage Kind Color Smell

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

New Specification Current Specification

The incompatible refrigerating 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 refrigerating oil of the upper layer to flow back to the compressor.

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

Compressor

Suction muffler

Oil back hole

Refrigerating oil

Refrigerant

Compressor

Suction muffler

Oil back hole

Refrigerating oil /Refrigerant

Compressor

Revision A:

E1E1

•MUX-A22WV - can be connected to MSC-A07/A12YV -

•Parts No. has been changed due to the color change of outdoor unit parts. WHITE➔NEW WHITE (Brighter)

TECHNICAL CHANGES

INFORMATION FOR THE AIR CONDITIONER WITH R410A REFRIGERANT

• This room air conditioner adopts an 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.

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/ff[Gauge])

Conversion chart of refrigerant temperature and pressure

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

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

No 12.7 mm

Wall thickness

Outside diameter

Pipe

For liquid For gas

6.35

9.52

12.7

0.8 mm

Heat resisting foam plastic Specific gravity 0.045 Thickness 8 mm

Insulation material

(MPa [Gauge])

4.0

3.5

3.0

2.5

2.0

1.5

R410A R22

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

international system of units(SI unit system).

1.0

0.5

Saturated liquid pressure

0.0

-0.5

-30 -20 -10 0 10 20

40 50 60

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

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

Pipe diameter

Air outlet

Drain outlet

Air inlet

Piping

Drainage hose

(Back and side)

Dimension of flare nut

6.35

9.52

12.7

R410A

17 22 26

R22

17 22 24

3.Refrigerant 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 refrigerating 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.

Union

Stop valve

Indoor unit

Refrigerant gas cylinder operating valve

Liquid pipe Gas pipe

Service port

Outdoor unit

PART NAMES AND FUNCTIONS

OUTDOOR UNIT

MUX-A22WV-

Gauge manifold valve (for R410A)

Charge hose (for R410A)

Refrigerant gas cylinder for R410A with siphon

Refrigerant (liquid)

Electronic scale for refrigerant charging

MUX-A22WV- E1

Combination

of the

connectable

indoor units

OUTDOOR UNIT

MSC-A12WV- E1 or MSC-A12YV- E1

MSC-A07WV- E1

or MSC-A07YV- E1

INDOOR / OUTDOOR CORRESPONDENCE TABLE3

MUX-A22WV -

Capacity

Electrical

Coefficient of performance (C.O.P)

Compressor

Fan

Special

SPECIFICATION

Outdoor unit power supply

Capacity Dehumidification Outdoor air flow Power outlet Running current Power input Auxiliary heater Power factor

data

Starting current Compressor motor current Fan motor current

Model Output Winding resistance (at 20:) Model Winding

motor

resistance (at 20:) Dimensions WOHOD Weight Sound level Fan speed Fan speed regulator Refrigerant filling

remarks

capacity (R410A) Refrigerating oil (Model)

Outdoor model

Function

Indoor unit No

MUX-A22WV -

Cooling

Single phase

230V,50Hz

R/h

K /h

A A

A(kW)

A A A

kg dB

rpm

kg cc

Single

3.5

1.4

5.73

1,280

97.1

5.02

2.65

Single B or C

2.4

0.9

3.64 815

97.3

2.99

2.82

MC1 : RN145VHSHT, MC2 : RN092VHSHT

MC1 : 1,000, MC2 : 600

MC1 : , MC2 :

MC1 : 620 (NEO22), MC2 : 350 (NEO22)

Double

A+B or A+C

3.5+2.4

1.4+0.9 2,460

8.92

1,975

—

96.3 48

8.01

0.57

2.88

C-R 2.43 C-S 3.80

RA6V60-GA

WHT-BLK 90 BLK-RED 146 840O640O330

67 52

730

0.85 (Room A)

0.85 (Room B+C)

Double

1.45O2

C-R 3.87 C-S 0.14

B+C

0.4

3.69 830

97.8

2.99

3.22

Triple

A+B+C

3.4+1.45O2

1.4+0.4

8.84

1,980

97.4

8.01

3.01

NOTE: Test conditions are based on ISO 5151.

Cooling : Indoor DB27°C WB19°C

Outdoor DB35°C WB24°C Indoor-Outdoor piping length 5m w Reference value

NOISE CRITERIA CURVES5

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:

COOL

FUNCTION

SPL(dB(A)) LINE

MUX-A22WV - E1

500

840 61

264

10°

Service panel

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

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

Open as a rule 500mm or more if the back, both sides and top are open

350mm or more

100mm or more

B UNIT A UNIT

Gas refrigerant pipe joint Refrigerant pipe (flared)

Liquid refrigerant pipe joint Refrigerant pipe (flared) {6.35

121

438

Air in

Air out

Air in

273

100

125

320

330

640

360

5050505050

Drainage 3holes {33

}

C UNIT

} }

C or B unit {9.52 A unit {12.7

MUX-A22WV-

OUTLINES AND DIMENSIONS

OUTDOOR UNIT

Unit: mm

123

213

123123123

21R421R3

NR61

T61

C61

LD1

WHT

OUTDOOR CONTROL P.C. BOARD

BRN

BLU

BRN

BLU

BRN

BLU

X522

X521

BLK

SR865

SR866

SR863

SR861

LD2

RED

BLK

WHT

652341

BRN BLU

BLU

TB4

CN86

CN85

CN81

CN91

CN90

TB3

TB2

X521

BLU BLU

X522

BLU

21RB

F61

CN74

CN73

CN71

TO INDOOR

UNIT B

CONNECTING

12V

CIRCUIT BREAKER

GRN/YLW

WHT

BLU

ORN

BLU

YLW

BLU

RED

TO INDOOR

UNIT A

CONNECTING

12V

MC2

TO INDOOR

UNIT C

CONNECTING

12V

MF61

MC1

BLK

TB1

POWER SUPPLY

~/N

230V

50Hz

DSAR

BRN

WIRING DIAGRAM

MUX-A22WV -

OUTDOOR UNIT

MODEL WIRING DIAGRAM

TERMINAL BLOCK

TRANSFORMER

COMPRESSOR CONTACTOR(MC1)

COMPRESSOR CONTACTOR(MC2)

SOLENOID COIL

SOLENOID COIL (B)

SOLENOID COIL (C)

T61

SYMBOL

TB2~TB4

NAME NAME

X521

X522

21R3

21RB

21R4

OUTDOOR FAN MOTOR(INNER PROTECTOR)

SURGE ABSORBER

OUTDOOR FAN RELAY

RELAY (21RB)

RELAY (C) (21R4)

RELAY (B) (21R3)

MF61

NR61

SR861

SYMBOL

NAME

COMPRESSOR CAPACITOR(MC1)

SYMBOL

SR863

COMPRESSOR CAPACITOR(MC2)

OUTDOOR FAN CAPACITOR

SURGE ABSORBER

C61

DSAR

TERMINAL BLOCK

TB1

SR865

SR866

FUSE(3.15A)

COMPRESSOR(INNER PROTECTOR)

F61

MC1

MC2

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

/: Terminal block, : Connector

3. Symbols below indicate.

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

OUTDOOR UNIT

INDOOR UNIT

UNIT A

Indoor

heat

exchanger

Indoor coil thermistor RT12

Room temperature thermistor RT11

UNIT B

Indoor

heat

exchanger

Outdoor

heat

exchanger

Indoor coil thermistor RT12

Room temperature thermistor RT11

(With insulation)

Refrigerant pipe

12.7

(With insulation)

Refrigerant pipe

9.52

(With insulation)

Refrigerant pipe

6.35

Flared connection

(With insulation)

Refrigerant pipe

6.35

Flared connection

Refrigerant pipe

9.52

(With insulation)

Refrigerant pipe

6.35

Flared connection

Stop valve with service port

Stop valve

Solenoid valve 21R3

Solenoid valve 21R4

Solenoid valve 21RB

Stop valve with service port

Capillary tube CT1

Capillary tube CT3

Capillary tube CT4

Capillary tube CT2

Capillary tube CT5

Compressor(A)

Compressor(B,C)

Refrigerant flow in cooling

UNIT C

Indoor

heat

exchanger

Indoor coil thermistor RT12

Room temperature thermistor RT11

Stop valve

Strainer #100

Muffler

[3.0 x [1.6 x 900

[3.0 x [1.4 x 1000

[3.0 x [1.6 x 900

[3.0 x [1.6 x700

[3.0 x [1.6 x 900

Strainer #100

Indoor unit A

B HLC

Indoor unit B

Indoor unit C

Outdoor unit

MUX-A22WV -

REFRIGERANT SYSTEM DIAGRAM

Unit : mm

MUX-A22WV-

MAX.REFRIGERANT PIPING LENGTH & MAX. HEIGHT DIFFERENCE

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