Mitsubishi SUZ-KA25VA2.TH, SUZ-KA35VA2.TH, SUZ-KA50VA2.TH, SUZ-KA60VA2.TH, SUZ-KA71VA2.TH Service Manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

TECHNICAL & SERVICE MANUAL

R410A

Outdoor unit
[model names]

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

[Service Ref.]

May 2010

No.OCH472

HFC

utilized

R410A

Indication of
model name

SUZ-KA25VA2.TH
SUZ-KA35VA2.TH

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.

CONTENTS

1.

COMBINATION OF INDOOR AND OUTDOOR UNITS

2. TECHNICAL CHANGES

3. PART NAMES AND FUNCTIONS

4. SPECIFICATION

5. NOISE CRITERIA CURVES

6. OUTLINES AND DIMENSIONS

7. WIRING DIAGRAM

8. REFRIGERANT SYSTEM DIAGRAM

9. ACTUA TOR CONTROL

10. SERVICE FUNCTIONS

11. TROUBLESHOOTING

12. DISASSEMBLY INSTRUCTIONS

PARTS CATALOG (OCB472)

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10
13

17

21
22

22

63

2

3
6
7
9

1

COMBINATION OF INDOOR AND OUTDOOR UNITS

1-1. INDOOR UNIT SERVICE MANUAL

Indoor unit

Service Ref.

SLZ-KA25VA(L).TH

Service

Manual No.

KA25VA2.TH

KA35VA2.TH

—

Outdoor unit

Heat pump type

SUZ-

—

KA60VA2.TH KA71VA2.THKA50VA2.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

Heat pump without electric heater

MFZ-KA35VA-E4

MFZ-KA50VA-E4

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

OC320

HWE0711

OB409

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

2

2

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.

Refrigerant
Composition (Ratio)
Refrigerant handling
Chlorine
Safety group (ASHRAE)
Molecular weight
Boiling point ()
Steam pressure [25](Mpa)
Saturated steam density [25](Kg/*)

Refrigerant

Combustibility
ODP +1
GWP +2
Refrigerant charge method
Additional charge on leakage
Kind
Color

oil

Smell

Refrigerant

+1: Ozone Depletion Potential : based on CFC-11
+2: Global Warming Potential : based on CO

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.

Suction muffler

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

Pseudo-azeotropic refrigerant

From liquid phase in cylinder

2

New refrigerant

R410A

Not included

A1/A1

72.6

-51.4

1.557
64

Non combustible

0

1730

Possible

Incompatible oil

None
None

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

Previous refrigerant

R22

R22 (100%)

Single refrigerant

Included

A1

86.5

-40.8

0.94

44.4

Non combustible

0.055
1700

Gas phase

Possible

Compatible oil

Light yellow

None

Suction muffler

Compressor

Compressor

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/cm

Oil back hole

Refrigerant oil

Refrigerant

Compressor

2

[Gauge])

Oil back hole

Refrigerant oil /Refrigerant

3

Conversion chart of refrigerant temperature and pressure

(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

30

40 50 60

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

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

Gas leak detector

Torque wrench

No

No

Yes

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

Dedicated for HFC refrigerant.

6.35 mm and 9.52 mm

No 12.7 mm and 15.88 mm

Flare tool

Flare gauge
Vacuum pump

adapter
Electronic scale for

refrigerant charging

Yes

New

New

New

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

No: Not substitutable for R410A Yes: Substitutable for R410A

Description

4

2. Refrigerant piping

1 Specifications
Use the refrigerant pipes that meet the following specifications.

Pipe

For liquid

For gas

• 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 (mm)

Outside diameter

mm mm

6.35

9.52

9.52

12.7

15.88

6.35

9.52

12.7

15.88

Wall thickness

0.8

0.8

0.8

0.8

1.0

R410A

17
22
26
29

Insulation material

Heat resisting foam plastic
Specific gravity 0.045 Thickness
8 mm

Dimension of flare nut (mm)

R22

17
22
24
27

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.

Union

Stop valve

Indoor unit

Refrigerant gas
cylinder
operating valve

Charge hose (for R410A)

Refrigerant gas cylinder
for R410A with siphon

Refrigerant (liquid)

Electronic scale for refrigerant charging

Liquid pipe

Gas pipe

Service port

Gauge manifold
valve (for R410A)

Outdoor unit

5

3

PART NAMES AND FUNCTIONS

SUZ-KA25VA2.TH SUZ-KA35VA2.TH

SUZ-KA50VA2.TH SUZ-KA60VA2.TH

Air inlet

(back and side)

Piping

Drain hose

Air outlet

Drain outlet

Air inlet

(back and side)

SUZ-KA71VA2.TH

Piping

Drain hose

Air outlet

Drain outlet

Air inlet

(back and side)

Piping

Drain hose

Air outlet

Drain outlet

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

Drain socket 1 1 1
Drain cap - 2 -

6

4

SPECIFICATION

Outdoor Service Ref.

Function

Power supply

Starting current *1
Compressor motor current *1
Fan motor current *1

Electrical

data

Model
Output
Winding
resistance (at 20)

Compressor

Model

Winding

Fan

motor

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

Special

remarks

capacity(R410A)
Refrigerating oil (Model)

*1

SUZ-KA25VA2.TH

Cooling

A
A
A

KNB073FFDH(C)

W

U-V 1.70 U-W 1.70



WHT-BLK 37.0



BLK-RED 37.0

RED-WHT 37.0

*/h

mm

kg
dB

rpm

810+/650

kg

cc

Heating

Single phase

230V, 50Hz

3.65

2.74

0.31

550

V-W 1.70

RC0J50-DB

2,058

800%550%285

30
46

+

880+/810+/650

2

0.80

320 (NEO22)

3.37

0.28

1,938

3

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

Cooling

KNB092FFAH(C)

U-V 1.91 U-W 1.91

WHT-BLK 37.0

BLK-RED 37.0

RED-WHT 37.0

+

840+/760

320 (NEO22)

Heating

Single phase

230V, 50Hz

4.75

4.22

0.33

RC0J50-DB

800%550%285

47

650

V-W 1. 91

2,004

2

1.05

4.42

0.33

33

48

+

880+/800+/630

3

+

Cooling

SNB130FGBH(T)

U-V 0.98 U-W 0.98

WHT-BLK 15.2

BLK-RED 15.2

RED-WHT 15.2

2,940/1,650+

53/51

840/480

450 (NEO22)

Heating

Single phase

230V, 50Hz

6.75

6.45

RC0J60-AA

840%850%330

6.05

0.30

900

V-W 0.98

2,940/2,210+

53

+

55/53

+

800/620

2

1.60

Cooling

SNB130FGBH(T)

U-V 0.98 U-W 0.98

WHT-BLK 15.2

BLK-RED 15.2

RED-WHT 15.2

2,940/1,650+

+

53/51

+

840/480

Heating

Single phase

230V, 50Hz

9.75

8.05

RC0J60-AA

840%850%330

450 (NEO22)

9.45

0.30

900

V-W 0.98

2,940/2,210+

53

+

55/53

+

800/620

2

1.80

Cooling

Single phase

230V, 50Hz

8.89

8.00

0.83

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

3,.425/3,006

/1,512+

840%880%330

53

+

+

55

+

950/840/450

400 (FV50S)

+

3

1.80

Heating

8.07

0.82

2,892/2,892

/2,280+

+

55

+

810/810/650

NOTE : Test conditions are based on ISO 5151
Cooling : Indoor D.B. 27: W.B. 1 9:
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.
w Reference value

7

Specifications and rating conditions of main electric parts

SUZ-KA25VA2.TH SUZ-KA35VA2.TH
SUZ-KA50VA2.TH SUZ-KA60VA2.TH
SUZ-KA71VA2.TH

Model

Item

Current
transformer

(CT761, CT781) 15A

Smoothing
capacitor

Diode module

Fuse

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

Inteligent power
module

Power factor
controller

Expansion valve
coil

High pressure
switch

Reactor

Current-detecting
resistor

(R937, R938, R939)

(R937A, R937B)
Resistor (RS1~4)
Current-Limiting

PTC thermistoe
Terminal block (TB1, TB2) 3P

Relay

Solenoid coil relay (SSR61)
R.V. coil (21S4) AC220-240V
IGBT (TR821) 30A 600V

(PTC64, PTC65) 33

(CT1, 2)

(CT61)

(C62, C63) 620+ 420V
(CB1, 2, 3)

(DB61) 15A 600V 25A 600V
(DB65) 25A 600V

(F911)

(HC930)

(IC932)

(PFC)

(HPS)

(R61, R62)

(R64A, R64B)

(R825) 25m 5W

(X601)
(X602)

SUZ-KA25VA2.THSUZ0KA35VA2.THSUZ-KA50VA2.THSUZ-KA60VA2.THSUZ-KA71VA2.

(CT) 20A

-

-

(C61)

(F61) T20A L250V
(F62)
(F63)
(F64)

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

(LEV) DC12V

(L61) 23mH

(L)

(R61)

(X63) 3A 250V
(X64) 20A 250V 20A 250V 20A 250V

45m 5W

(1 element)

-

-

--

---

-

-

-

-

-

-

100m 5W

(2 elements)

-

-

430m 2W

-

-

-

620+ 420V

-

180m 5W

(2 elements)

1.1 2W 1.1 2W 2%

-

-

TH

-­ETQ19Z68AY
ETQ19Z53AY

--

--

--

560F 450V 560F 350V

--

--

--

250V 2A

250V 1A

3A 450V

PS51259-A 20A 600V

ACB-DB156

(for R2)

-

340H 20A 340H

-

-

10 10W

-

-

0.04 7W

-

-

TLP3506

--

-

-

T20A L250V

-

-

-

-

5A 600V

-

-

-

33

3A 250V
3A 250V

-

8

5

NOISE CRITERIA CURVES

SUZ-KA25VA2.TH

FAN SPEED

High
Med.

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

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

90

80

70

60

50

40

30

APPROXIMATE

20

THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

10

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

FUNCTION

COOLING

HEATING

SPL(dB(A))

46

46

LINE

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

SUZ-KA35VA2.TH

SPL(dB(A))

47

48

LINE

High

FUNCTION

COOLING

HEATING

FAN SPEED

Med.

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

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

90

80

70

60

50

40

30

APPROXIMATE

20

THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

10

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

SUZ-KA50VA2.TH SUZ-KA60VA2.TH

FAN SPEED

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

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

90

80

70

60

50

40

30

APPROXIMATE

20

THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

10

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

High

FUNCTION

COOLING

HEATING

SPL(dB(A)) LINE

53

55

Test conditions
Cooling: Dry-bulb temperature 35°C
Heating: Dry-bulb temperature 7°C
Wet-bulb temperature 6°C

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

SUZ-KA71VA2.TH

FAN SPEED

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

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

90

80

70

60

50

40

30

20

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

10

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

High

FUNCTION

COOLING

HEATING

MICROPHONE

SPL(dB(A)) LINE

55

55

NC-10

OUTDOOR UNIT

1 m

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

99

6

OUTLINES AND DIMENSIONS

SUZ-KA25VA2.TH SUZ-KA35VA2.TH

REQUIRED SPACE

Unit: mm

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

344.5

Air in

285

2-Oval holes 10×21

22.3

Handle

550

280

400

Air in

44

Air out

10

150

302.5

500 Bolt pitch for installation

800

Drain hole :42

40

69

17.5

Bolt pitch for

23

164.5

99.5

304~325

installation

Service port

100mm or more

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

Service panel

Liquid refrigerant pipe joint
Refrigerant pipe (flared) :6.35

35

43

Gas refrigerant pipe joint
Refrigerant pipe (flared) :9.52

170.5

200mm or more

100mm or more

350mm or more

10

SUZ-KA50VA2.TH SUZ-KA60VA2.TH

Drain holes :33

515

330

51

Air in

299

66

Air in

34

40

REQUIRED SPACE

100mm or more

360

installation

Bolt pitch for

Unit: mm

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

4-Oval holes 10×21

850

430

Air out

121

500

840

81

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

155

90

198

350mm or more

Service panel

Liquid refrigerant
pipe joint
Refrigerant pipe(flared)
:6.35

30

35

Gas refrigerant
pipe joint
Refrigerant pipe(flared)

:12.7·····(SUZ-KA50VA2.TH)
:15.88···(SUZ-KA60VA2.TH)

1111

SUZ-KA71VA2.TH

Unit: mm

330

50

Air in

880

175

417.5

Air in

Air out

500

109

840

Drain hole

40

2-Oval holes 10 21

42

Bolt pitch for

81

REQUIRED SPACE

100 mm or more

360

installation

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

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

350 mm or more

Service panel

Liquid refrigerant
pipe joint
Refrigerant pipe
(flared)

Ø 9.52

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

452

164.5

99.5

195

35

44

Gas refrigerant
pipe joint
Refrigerant pipe
(flared)

Ø 15.88

12

7

WIRING DIAGRAM

SUZ-KA25VA2.TH
SUZ-KA35VA2.TH

NOTES: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

1313

SUZ-KA50VA2.TH

BLK

TB1

230V~

S3S1S2

BLU

CONNECTING
UNIT
TO INDOOR

BRN

~/N 230V 50Hz
POWER SUPPLY

BREAKER

TB2

BRN

BLU

12-24V

RED

CIRCUIT

L

N

GRN/YLW

L61

ORN YLW

21S4

CN721

2

1

X63

LD66LD70

X64

C61

C62C63

F701

IC802

T801

PTC64

LD63

F801

LD-E1

PTC65

CT

R937B

R937A

R61

DSA

L62

U

INVERTER P.C. BOARD

HC930

F901

LD-S

LD62

U

U

LD61

6

CN724

1
4

CN641

1
2

CN643

1

3

CN644

1
2

CN642

1

1

3

CN932

5

CN931

1

F61

BRN

diagram for servicing.

refer to the indoor unit electric wiring

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

1. About the indoor side electric wiring,NOTES:

3. Symbols below indicate.

6

:Terminal block

M

LEV

NAME

RT62

RT61

RT65

CURRENT-DETECTING RESISTOR

CURRENT-DETECTING RESISTOR

R61

R825

SYMBOL

CURRENT-DETECTING RESISTOR

TERMINAL BLOCK

SWITCHING POWER TRANSISTOR

TR821

TB1,TB52

R937A, B

TRANSFORMER

REVERSING VALVE COIL

RELAY

T801

21S4

X63,X64

RT68

RT64

NAME

3

MF

MS

3~

5

EXPANSION VALVE COIL

FAN MOTOR

COMPRESSOR

MF

MC

LEV

SYMBOL

DEFROST THERMISTOR

CIRCUIT PROTECTION

DISCHARGE TEMP. THERMISTOR

AMBIENT TEMP. THERMISTOR

FIN TEMP. THERMISTOR

RT65

RT64

RT62

RT61

PTC64,PTC65

OUTDOOR HEAT EXCHANGER

TEMP. THERMISTOR

RT68

DB61

DB65

R825

N

W

TR821

RED

3

3

RED

W

V

LDW

WHT

WHT

V

MS

LDV

BLKBLK

3~

P

U

LDU

1

1

U

MC

IPM

14

NAME

DIODE MODULE

SMOOTHING CAPACITOR

CURRENT TRANSFORMER

SURGE ABSORBER

CT

SYMBOL

DSA

C61,62,63

DB61,DB65

FUSE (T3.15AL 250V)

FUSE (T20AL 250V)

F61

REACTOR

INTELLIGENT POWER DEVICE

INTELLIGENT POWER MODULE

L61

IC802

HC930,IPM

F701,F801,F901

REACTOR

L62

SUZ-KA60VA2.TH

:Terminal block

diagram for servicing.

refer to the indoor unit electric wiring

3. Symbols below indicate.

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

1. About the indoor side electric wiringNOTES:

NAME

RESISTOR

AMBIENT TEMP. THERMISTOR

OUTDOOR HEAT EXCHANGER TEMP. THERMISTOR

RT68

RT65

SYMBOL

R64A,B

NAME

EXPANSION VALVE

COMPRESSOR

FAN MOTOR

MF

MC

LEV

SYMBOL

NAME

TRANSFORMER

TERMINAL BLOCK

TERMINAL BLOCK

RESISTOR

SOLENOID COIL RELAY

TB1

TB2

T801

SSR61

R937A, B

VAR ISTOR

NOISE FILTER

NF

DEFROST THERMISTOR

POWER FACTOR CONTROLLER

RESISTOR

PFC

RT61

NR64

RS1~4

REVERSING VALVE COIL

RELAY

X64

21S4

DISCHARGE TEMP. THERMISTOR

FIN TEMP. THERMISTOR

RT64

RT62

15

CURRENT TRANSFORMER

CURRENT TRANSFORMER

SMOOTHING CAPACITOR

CT61

CT1, 2

CB1~3

SYMBOL

FUSE (T2AL 250V)

FUSE (T1AL 250V)

INTELLIGENT POWER MODULE

FUSE (T3.15AL 250V)

F64

F911

F801

HC930

HIGH PRESSURE SWITCH

REACTOR

INTELLIGENT POWER MODULE

L

IPM

HPS

SUZ-KA71VA2.TH

16

8

REFRIGERANT SYSTEM DIAGRAM

SUZ-KA25VA2.TH

Refrigerant pipe ø9.52
(with heat insulator)

Flared connection

Flared connection

Refrigerant pipe ø6.35
(with heat insulator)

Muffler

Stop valve
(with service port)

Capillary tube
ø3.0×ø2.0×240

Stop valve
(with strainer)

4-way valve

Discharge
temperature
thermistor
RT62

LEV

Muffler

Compressor

Defrost
thermistor
RT61

Outdoor heat
exchanger
temperature

Outdoor
heat
exchanger

Refrigerant flow in cooling
Refrigerant flow in heating

thermistor
RT68

Ambient
temperature
thermistor
RT65

Strainer
#100

R.V. coil
heating ON
cooling OFF

Unit: mm

SUZ-KA35VA2.TH

Refrigerant pipe ø9.52
(with heat insulator)

Flared connection

Flared connection

Refrigerant pipe ø6.35
(with heat insulator)

Muffler

Stop valve
(with service port)

Capillary tube
ø3.0×ø2.0×240

Stop valve
(with strainer)

4-way valve

Discharge
temperature
thermistor
RT62

LEV

Muffler

Compressor

Defrost
thermistor
RT61

Capillary tube
ø3.0×ø1.8×600(×2)

Refrigerant flow in cooling
Refrigerant flow in heating

Outdoor
heat
exchanger

Strainer
#100

R.V. coil
heating ON
cooling OFF

Outdoor heat
exchanger
temperature
thermistor
RT68

Ambient
temperature
thermistor
RT65

Unit: mm

1717

SUZ-KA50VA2.TH

Refrigerant pipe ø12.7
(with heat insulator)

Flared connection

4-way valve

Stop valve
(with service port)

Muffler

#100

Discharge
temperature
thermistor
RT62

Defrost
thermistor
RT61

Outdoor
heat
exchanger

Ambient
temperature
thermistor
RT65

Unit: mm

Flared connection

Refrigerant pipe ø6.35
(with heat insulator)

SUZ-KA60VA2.TH

Refrigerant pipe :15.88
(with heat insulator)

Flared connection

Receiver

Stop valve
(with strainer)

4-way valve

Stop valve
(with service port)

Compressor

Capillary tube
ø3.6×ø2.4×50

Muffler

#100

Discharge
temperature
thermistor
RT62

LEV

Strainer

#100

High-pressure
switch

Defrost
thermistor
RT61

Outdoor heat
exchanger
temperature
thermistor
RT68

R.V. coil
heating ON
cooling OFF

Refrigerant flow in cooling
Refrigerant flow in heating

Outdoor
heat
exchanger

Ambient
temperature
thermistor
RT65

Unit: mm

Flared connection

Refrigerant pipe :6.35
(with heat insulator)

Receiver

Stop valve

Strainer

#100

Capillary tube
:3.6:2.450

Compressor

LEV

18

Strainer

#100

Outdoor heat
exchanger
temperature
thermistor
RT68

R.V. coil
heating ON
cooling OFF

Refrigerant flow in cooling
Refrigerant flow in heating

SUZ-KA71VA2.TH

Unit: mm

ø

Refrigerant pipe
(with heat insulator)

Flared connection

Flared connection

Refrigerant pipe ø9.52
(with heat insulator)

15.88
4-way valve

Stop valve
(with service port)

Strainer

#100

Stop valve

Muffler

#100

Discharge
temperature
thermistor
RT62

Compressor

Capillary tube

ø

4.0

×

ø

2.4×100

LEV

Strainer

#100

Outdoor
heat

Defrost
thermistor
RT61

Refrigerant flow in cooling
Refrigerant flow in heating

exchanger

Outdoor heat
exchanger
temperature
thermistor
RT68

R.V. coil
heating ON
cooling OFF

Ambient
temperature
thermistor
RT65

19

SUZ-KA25VA2.TH SUZ-KA35VA2.TH SUZ-KA50VA2.TH
SUZ-KA60VA2.TH SUZ-KA71VA2.TH

MAX. REFRIGERANT PIPING LENGTH

Models

SUZ-KA25VA2.TH
SUZ-KA35VA2.TH
SUZ-KA50VA2.TH
SUZ-KA60VA2.TH
SUZ-KA71VA2.TH 9.52

Max. Length A

MAX. HEIGHT DIFFERENCE

Indoor
unit

+ Max. Height
difference
B

Refrigerant piping: m Piping size O.D: mm

Max. Height difference B

20 12 9.52

30 30(15)

( ): MFZ-KA50VA-E4

Max. Length
A

Gas Liquid

12.7

15.88

6.35

Outdoor unit

+ Height difference limitations are binding regardless of which unit, indoor or outdoor, is position high.

ADDITIONAL REFRIGERANT CHARGE (R410A: g)

Models

SUZ-KA25VA2.TH 800 0 0 0 90 120 150 180 210 240 270 300 450
SUZ-KA35VA2.TH 1,050 0 0 0 90 120 150 180 210 240 270 300 450

Models

SUZ-KA50VA2.TH 1,600 0 60 160 260 360 460
SUZ-KA60VA2.TH 1,800 0 60 160 260 360 460

Models

SUZ-KA71VA2.TH 1,800 0 165 440 715 990 1,265

Outdoor unit

precharged

Outdoor unit

precharged

Outdoor unit

precharged

5m 6m 7m 8m 9m 10m 11m 12m 13m 14m 15m 20m

7m 10m 15m 20m 25m 30m

7m 10m 15m 20m 25m 30m

Refrigerant piping length (one way)

Calculation: Xg=30g/mo(Refrigerant piping length(m)-5)

Refrigerant piping length (one way)

Calculation : Xg=20g/m o (Refrigerant piping length(m)–7)

Refrigerant piping length (one way)

Calculation : Xg=55g/m o (Refrigerant piping length(m)-7)

20

9

ACTUATOR CONTROL

SUZ-KA25VA2.TH SUZ-KA35VA2.TH SUZ-KA50VA2.TH
SUZ-KA60VA2.TH

SUZ-KA71VA2.TH

9-1. Outdoor fan motor control

The fan motor turns ON/OFF, interlocking with the compressor.
[ON] The fan motor turns ON 5 seconds before the compressor starts up.
[OFF] The fan motor turns OFF 15 seconds after the compressor has stopped running.

5 seconds 15 seconds

ON

Compressor

OFF

ON

Outdoor fan

OFF

9-2. R.V. coil control

Heating

Cooling . . . . . . . . . . . . . . . . . OFF

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

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

Dry

Compressor

R.V.coil

Outdoor fan

motor

ON

OFF

ON

OFF

ON

OFF

ON

OFF

NOTE: The 4-way valve reverses for 5 seconds

<COOL>

5 seconds

9-3. Relation between main sensor and actuator

esopruProsneS

Discharge temperature
thermistor

Indoor coil temperature
thermistor

Defrost thermistor Heating: Defrosting

Fin temperature thermistor Protection
Ambient temperature

thermistor

Outdoor heat exchanger tem­perature thermistor

Protection

Cooling: Coil frost prevention
Heating: High pressure protection

Cooling: Low ambient temperature operation

Cooling: Low ambient temperature operation
Cooling: High pressure protection

right before start-up of the compressor.

<HEAT>

5 seconds

Actuator

Compressor

LEV

Outdoor fan

motor

R.V.coil

○○
○

○○
○○○○
○○

○○○
○○○

○○○

2121

10

SERVICE FUNCTIONS

SUZ-KA25VA2.TH SUZ-KA35VA2.TH

CHANGE IN DEFROST SETTING

<JS> When the JS wire of the outdoor Inverter P.C. board is cut/ soldered, the defrost finish temperature is changed.
(Refer to 11-6-1)

Jumper wire

JS

SUZ-KA25VA2.TH SUZ-KA35VA2.TH

soldered

(Initial setting)

none

(cut)

Defrost fi nish temperature

:

5

:

8

10

13

:

:

11

TROUBLESHOOTING

SUZ-KA25VA2.TH SUZ-KA35VA2.TH
SUZ-KA50VA2.TH SUZ-KA60VA2.TH SUZ-KA71VA2.TH

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 miswiring.

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 turn off the breaker.

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 electrical parts, be careful of the residual voltage of smoothing capacitor.

4) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the

components.

5) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.

Lead wire

3. Troubleshooting procedure

1) First, check if the OPERATION INDICATOR lamp is blinking on and off to indicate an abnormality. To make sure,
check how many times the abnormality indication is blinking on and off before starting service work.

2) Before servicing check that the connector and terminal are connected properly.

3) If the electronic control P.C. board is supposed to be defective, check the copper foil pattern for disconnection and
the components for bursting and discoloration.

4) When troubleshooting, refer to 11-2. and 11-3.

Housing point

22

11-2. Failure mode recall function

As this air conditioner has a function to memorize all the failures that had happened, the latest failure detail can be
recalled by following the procedures below.
Use this function when the check code is not displayed with wired remote controller or the remote controller at use is
wireless type.

11-2-1. Flow chart of the indoor/outdoor unit failure mode recall function

 While pressing both OPERATION SELECT
button and TOO COOL button on the

O

O

Operational procedure (For wireless remote controller)

Setting up the failure mode recall function

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

1
Press OPERATE/STOP (ON/OFF) button of the remote controller
(the set temperature is displayed).

Does OPERATION INDICATOR lamp on the indoor
unit blink at the interval of 0.5 seconds?
Blinks: Either indoor or outdoor unit is abnormal.
Beep sounds are emitted at the same timing of the
blinking of OPERATION INDICATOR lamp. 2

Judgment of indoor/outdoor abnormality

Before blinking, does POWER
lamp stay ON for 3 seconds?
Stays ON for 3 seconds (without beep):
The outdoor unit is abnormal.

The indoor unit is abnormal.
Check the blinking pattern, and confirm the
abnormal point.
Make sure to check at least two consecutive blinking cycles. 2

Yes

(Blinks)

No

No

(OFF)

Yes

Indoor unit is normal.
There is a possibility that the plasma or outdoor unit is abnormal.
Confirm the failure detail on the LED display of the outdoor
controller board.(refer to 11-2-4.)

The outdoor unit is abnormal.
Check the blinking pattern, and confirm the abnormal
point(11-2.3.).
Make sure to check at least two consecutive blinking cycles. 3

T
COOL

OO

COO

TO

AU

T

HEA

ON/OFF

T

SELECT

N
A
F

L

E

N

A
V

Y

DR

WARM

remote controller at the same time,

E

press RESET button.

IM

T

 First, release RESET button.

SET

RE

And release the other two buttons since all LCD
in operation display section of the remote controller
is displayed after 3 seconds.

h

TOO

TOO
COOL

1. Regardless of normal or abnormal, a short
beep is emitted once as the signal is received.

Releasing the failure mode recall function

Release the failure mode recall function by the following procedures.
With the remote controller headed towards the indoor unit, press any button
that is not used in this failure mode recall function (e.g. TIMER button) .
OR

Turn OFF the power supply and turn ON it again.
Press RESET button of the remote controller.

OPERATION INDICATOR lamp

Repair the defective parts.

Note1. Make sure to release the failure mode recall function once it is set up, otherwise the unit cannot operate properly.

2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.

2. Blinking pattern when the indoor unit is abnormal:[Output pattern A]

Beeper sounds

OPERATION
INDICATOR
lamp blink
pattern

Beep

Self-check
starts
(Start signal
received)

Beep Beep Beep Beep Beep Beep

1st2nd3

Off

Approx. 2.5 sec.On0.5 sec.On0.5 sec.On0.5 sec.

Number of blinks/beeps in pattern indicates the check
code in the next page (i.e., n=5 for “P5”)

rd

th

n

Off

On

Approx. 2.5 sec.On0.5 sec.On0.5 sec.

0.5 sec.

nd

1st2

Number of blinks/beeps in pattern indicates
the check code in the next page

··· Repeated

3.Blinking pattern when the outdoor unit is abnormal:[Output pattern B]

Beeper sounds

OPERATION
INDICATOR
lamp blink
pattern

Beep Beep Beep Beep Beep Beep Beep

1st2nd3

Off

Approx. 2.5 sec.OnApprox. 3 sec.On0.5 sec.On0.5 sec.On0.5 sec.On0.5 sec.

Self-check
starts
(Start signal
received)

Number of blinks/beeps in pattern indicates the check
code in the next page (i.e., n=5 for “U2”)

rd

th

n

Off

Approx. 2.5 sec.OnApprox. 3 sec.On0.5 sec.On0.5 sec.

nd

1st2

Number of blinks/beeps in pattern indicates
the check code in the next page

··· Repeated

2323