Mitsubishi Electric SUZ-KA35VA2 Manuale operativo

TECHNICAL & SERVICE MANUAL

No.OCH472

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

R410A

Outdoor unit

[model names]

[Service Ref.]

SUZ-KA25VA2 SUZ-KA25VA2.TH

SUZ-KA35VA2 SUZ-KA35VA2.TH

SUZ-KA50VA2 SUZ-KA50VA2.TH

SUZ-KA60VA2 SUZ-KA60VA2.TH

SUZ-KA71VA2 SUZ-KA71VA2.TH

CONTENTS

COMBINATION OF INDOOR AND OUTDOOR UNITS

.......

2. TECHNICAL CHANGES

....................................

3. PART NAMES AND FUNCTIONS......................6

4. SPECIFICATION.................................................

5. NOISE CRITERIA CURVES...............................9

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

7. WIRING DIAGRAM...........................................13

8. REFRIGERANT SYSTEM DIAGRAM..............17

9. ACTUATOR CONTROL....................................21

10. SERVICE FUNCTIONS.....................................22

11. TROUBLESHOOTING......................................22

12. DISASSEMBLY INSTRUCTIONS.....................63

Indication of

model name

NOTE:

This service manual describes technical data of the

outdoor units.

RoHS compliant products have <G> mark on the spec

name plate.

For servicing of RoHS compliant products, refer to the

RoHS Parts List.

HFC

utilized

R410A

SUZ-KA25VA2.TH

SUZ-KA35VA2.TH

May 2010

PARTS CATALOG (OCB472)

1COMBINATION OF INDOOR AND OUTDOOR UNITS

Heat pump type

Outdoor unit

SUZ-

SLZ-KA25VA(L).TH

SLZ-KA35VA(L).TH

SLZ-KA50VA(L).TH

SEZ-KD25VA(L).TH

SEZ-KD35VA(L).TH

SEZ-KD50VA(L).TH

SEZ-KD60VA(L).TH

SEZ-KD71VA(L).TH

MFZ-KA25VA-E4

MFZ-KA35VA-E4

MFZ-KA50VA-E4

—

OC320

OB409

Indoor unit

Service

Manual No.

Service Ref.

Heat pump without electric heater

KA25VA2.TH

KA60VA2.TH KA71VA2.THKA50VA2.TH

HWE0711

KA35VA2.TH

(NOTE) • Please refer to the service manual of indoor unit or the technical data book for the combination data.

1-1. INDOOR UNIT SERVICE MANUAL

2TECHNICAL CHANGES

Refrigerant

oil

Refrigerant

New refrigerant

R410A

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

Pseudo-azeotropic refrigerant

Not included

A1/A1

72.6

-51.4

1.557

Non combustible

1730

From liquid phase in cylinder

Possible

Incompatible oil

None

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

None

Refrigerant

Composition (Ratio)

Refrigerant handling

Chlorine

Safety group (ASHRAE)

Molecular weight

Boiling point ()

Steam pressure [25](Mpa)

Saturated steam density [25](Kg/*)

Combustibility

ODP +1

GWP +2

Refrigerant charge method

Additional charge on leakage

Kind

Color

Smell

+1: Ozone Depletion Potential : based on CFC-11

+2: Global Warming Potential : based on CO2

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.

2Take 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.

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

piping.)

4Composition 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/cm2[Gauge])

New Specification Current Specification

The incompatible refrigerant 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

refrigerant oil of the upper layer to flow back to the

compressor.

Since refrigerant and refrigerant oil are compatible with

each other, refrigerant oil backs to the compressor through

the lower position oil back hole.

Compressor

Suction muffler

Oil back hole

Refrigerant oil

Refrigerant

Compressor

Suction muffler

Oil back hole

Refrigerant oil /Refrigerant

Compressor

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 and 15.88 mm

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.

-30 -20 -10 0 10 20 30 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

international system of units (SI unit system).

The conversion factor is: 1 (MPa [Gauge]) =10.2 (kgf/cm2[Gauge])

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)

R410A

Pipe diameter (mm)

6.35

9.52

12.7

15.88

Dimension of flare nut (mm)

R22

• 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.

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”.

3. Refrigerant oil

Apply the special refrigerant 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.

2. Refrigerant piping

1Specifications

Use the refrigerant pipes that meet the following specifications.

Wall thickness

Outside diameter

Pipe mm mm

For liquid

For gas

6.35

9.52

12.7

15.88

0.8

1.0

Heat resisting foam plastic

Specific gravity 0.045 Thickness

8 mm

Insulation material

3PART NAMES AND FUNCTIONS

SUZ-KA25VA2.TH SUZ-KA35VA2.TH

SUZ-KA50VA2.TH SUZ-KA60VA2.TH

SUZ-KA71VA2.TH

Air outlet

Drain outlet

Piping

Drain hose

Air inlet

(back and side)

Piping

Air outlet

Air inlet

(back and side)

Drain hose

Drain outlet

Model SUZ-KA25/35VA2.TH SUZ-KA50/60VA2.TH SUZ-KA71VA2.TH

Drain socket 1 1 1

Drain cap - 2 -

Piping

Air outlet

Drain outlet

Air inlet

(back and side)

Drain hose

SPECIFICATION

Function

Power supply

Outdoor Service Ref.

Starting current *1

Compressor motor current *1

Fan motor current *1

Model

Output

Winding

resistance (at 20)

Model

Winding

resistance(at 20)

Air flow(High/Low+)

Dimensions WHD

Weight

Sound level

Fan speed(High+/Low+, High+/Med+/Low+)

Fan speed regulator

Refrigerant filling

capacity(R410A)

Refrigerating oil (Model)



*/h

rpm

810+/650+

880+/810+/650+

Compressor

Fan

motor

Special

remarks

Electrical

data

SUZ-KA25VA2.TH

Single phase

230V, 50Hz

3.65

KNB073FFDH(C)

550

U-V 1.70 U-W 1.70

V-W 1.70

RC0J50-DB

WHT-BLK 37.0

BLK-RED 37.0

RED-WHT 37.0

800%550%285

0.80

320 (NEO22)

Cooling

2.74

0.31

2,058

Heating

3.37

0.28

1,938

SUZ-KA35VA2.TH SUZ-KA50VA2.TH SUZ-KA60VA2.TH SUZ-KA71VA2.TH

840+/760+

880+/800+/630+

Single phase

230V, 50Hz

4.75

KNB092FFAH(C)

650

U-V 1.91 U-W 1.91

V-W 1.91

RC0J50-DB

WHT-BLK 37.0

BLK-RED 37.0

RED-WHT 37.0

2,004

800%550%285

1.05

320 (NEO22)

Cooling

4.22

0.33

Heating

4.42

0.33

840/480+800/620+

Single phase

230V, 50Hz

6.75

0.30

SNB130FGBH(T)

900

U-V 0.98 U-W 0.98

V-W 0.98

RC0J60-AA

WHT-BLK 15.2

BLK-RED 15.2

RED-WHT 15.2

840%850%330

1.60

450 (NEO22)

Cooling

6.45

2,940/1,650+

53/51+

Heating

6.05

2,940/2,210+

55/53+

840/480+800/620+

Single phase

230V, 50Hz

9.75

0.30

SNB130FGBH(T)

900

U-V 0.98 U-W 0.98

V-W 0.98

RC0J60-AA

WHT-BLK 15.2

BLK-RED 15.2

RED-WHT 15.2

840%850%330

1.80

450 (NEO22)

Cooling

8.05

2,940/1,650+

53/51+

Heating

9.45

2,940/2,210+

55/53+

950/840/450+810/810/650+

Single phase

230V, 50Hz

8.89

SNB172FEKMT

1200

U-V 1.04 U-W 1.04

V-W 1.04

RC0J60-BC

WHT-BLK 15.0

BLK-RED 15.0

RED-WHT 15.0

840%880%330

1.80

400 (FV50S)

Cooling

8.00

0.83

3,.425/3,006

/1,512+

55+

Heating

8.07

0.82

2,892/2,892

/2,280+

55+

NOTE : Test conditions are based on ISO 5151

Cooling : Indoor D.B. 27: W.B. 19:

Outdoor D.B. 35:W.B. 24:

Heating : Indoor D.B. 20:W.B. 15:

Outdoor D.B. 7:W.B. 6:

Refrigerant piping length (one way): 5m

*1 Measured under rated operating frequency.

wReference value

SUZ-KA25VA2.TH SUZ-KA35VA2.TH

SUZ-KA50VA2.TH SUZ-KA60VA2.TH

SUZ-KA71VA2.TH

Specifications and rating conditions of main electric parts

Model

Item

SUZ-KA25VA2.

TH SUZ0KA35VA2.

TH SUZ-KA50VA2.

TH SUZ-KA60VA2.

TH SUZ-KA71VA2.

Current

transformer

(CT) 20A

(CT1, 2)

ETQ19Z68AY

(CT61)

ETQ19Z53AY

(CT761, CT781) 15A

Smoothing

capacitor

(C61)

620+420V

(C62, C63) 620+420V

(CB1, 2, 3)

560F 450V 560F 350V

Diode module (DB61) 15A 600V 25A 600V

(DB65) 25A 600V

Fuse

(F61) T20A L250V

(F62)

T20A L250V

(F63)

---

(F64)

250V 2A

(F701, F801, F901) T3.15A L250V

(F911)

250V 1A

Inteligent power

module

(IPM) 15A 600V 20A 600V 15A 600V 20A 600V

(HC930)

3A 450V

(IC932)

5A 600V

Power factor

controller (PFC)

PS51259-A 20A 600V

Expansion valve

coil (LEV) DC12V

High pressure

switch (HPS)

ACB-DB156

(for R2)

Reactor (L61) 23mH

(L)

340H 20A 340H

Current-detecting

resistor

(R61) 45m5W

(1 element)

100m5W

(2 elements)

(R61, R62)

180m5W

(2 elements)

(R64A, R64B)

1010W

(R825) 25m5W

(R937, R938, R939)

430m2W

(R937A, R937B)

1.12W 1.12W 2%

Resistor (RS1~4)

0.047W

Current-Limiting

PTC thermistoe (PTC64, PTC65) 33

33

Terminal block (TB1, TB2) 3P

Relay

(X63) 3A 250V

(X64) 20A 250V 20A 250V 20A 250V

(X601)

3A 250V

(X602)

3A 250V

Solenoid coil relay (SSR61)

TLP3506

R.V. coil (21S4) AC220-240V

IGBT (TR821) 30A 600V

NOISE CRITERIA CURVES

10 63 125 250 500 1000 2000 4000 8000

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

APPROXIMATE

THRESHOLD OF

HEARING FOR

CONTINUOUS

NOISE

COOLING

FUNCTION SPL(dB(A)) LINE

High

Med.

FAN SPEED

HEATING

Test conditions,

Cooling : Dry-bulb temperature 35Wet-bulb temperature (24)

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

SUZ-KA25VA2.TH

10 63 125 250 500 1000 2000 4000 8000

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

APPROXIMATE

THRESHOLD OF

HEARING FOR

CONTINUOUS

NOISE

COOLING

FUNCTION SPL(dB(A)) LINE

FAN SPEED

HEATING

Test conditions,

Cooling : Dry-bulb temperature 35Wet-bulb temperature (24)

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

High

Med.

SUZ-KA35VA2.TH

COOLING

FUNCTION SPL(dB(A)) LINE

High

FAN SPEED

HEATING

10 63 125 250 500 1000 2000 4000 8000

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

BAND CENTER FREQUENCIES, Hz

Test conditions,

Cooling : Dry-bulb temperature 35Wet-bulb temperature (24)

APPROXIMATE

THRESHOLD OF

HEARING FOR

CONTINUOUS

NOISE

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

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

SUZ-KA50VA2.TH SUZ-KA60VA2.TH

Test conditions

Cooling: Dry-bulb temperature 35°C

Heating: Dry-bulb temperature 7°C

Wet-bulb temperature 6°C

OUTDOOR UNIT

MICROPHONE

1 m

SUZ-KA71VA2.TH

10 63 125 250 500 1000 2000 4000 8000

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, 0dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

NC-10

COOLING

FUNCTION SPL(dB(A)) LINE

High

FAN SPEED

HEATING

Test conditions,

Cooling : Dry-bulb temperature 35Wet-bulb temperature (24)

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

6OUTLINES AND DIMENSIONS

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-Oval holes 10×21

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

Unit: mm

SUZ-KA25VA2.TH SUZ-KA35VA2.TH

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