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Mitsubishi Electric SUZ-KA35VA2 User Manual

Mitsubishi Electric SUZ-KA35VA2
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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
1.
COMBINATION OF INDOOR AND OUTDOOR UNITS
.......
2
2. TECHNICAL CHANGES
....................................
3
3. PART NAMES AND FUNCTIONS
......................
6
4. SPECIFICATION
.................................................
7
5. NOISE CRITERIA CURVES
...............................
9
6. OUTLINES AND DIMENSIONS
........................
10
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)

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Mitsubishi Electric SUZ-KA35VA2 Specifications

General IconGeneral
BrandMitsubishi Electric
ModelSUZ-KA35VA2
CategoryAir Conditioner
LanguageEnglish

Summary

1 COMBINATION OF INDOOR AND OUTDOOR UNITS

1-1. INDOOR UNIT SERVICE MANUAL

Reference to the indoor unit service manual for combination data.

2 TECHNICAL CHANGES

2. Refrigerant piping

3. Refrigerant oil

Details on the type of refrigerant oil to be used.

4. Air purge

Procedures for air purging in the refrigerant circuit.

5. Additional charge

Instructions for adding refrigerant to the system.

3 PART NAMES AND FUNCTIONS

4 SPECIFICATION

Specifications and rating conditions of main electric parts

Details on the specifications of key electrical components.

5 NOISE CRITERIA CURVES

6 OUTLINES AND DIMENSIONS

7 WIRING DIAGRAM

8 REFRIGERANT SYSTEM DIAGRAM

MAX. REFRIGERANT PIPING LENGTH

ADDITIONAL REFRIGERANT CHARGE (R410A: g)

Guidelines for calculating additional refrigerant charge based on piping length.

9 ACTUATOR CONTROL

9-1. Outdoor fan motor control

Operation sequence for the outdoor fan motor.

9-2. R.V. coil control

Operation sequence for the reversing valve coil.

9-3. Relation between main sensor and actuator

Mapping of sensors to actuators for system control.

10 SERVICE FUNCTIONS

11 TROUBLESHOOTING

11-1. Cautions on troubleshooting

Important warnings and precautions before performing troubleshooting.

11-2. Failure mode recall function

Method to recall and analyze recorded failure modes.

11-2-3. Failure mode table (Wireless remote controller/Wired remote controller)

Table listing error codes and their corresponding symptoms.

11-2-4. Outdoor unit failure mode table

Table of outdoor unit specific failure modes and LED indications.

11-3. Trouble shooting check table

Detailed check table for troubleshooting based on LED indications.

11-4. Trouble criterion of main parts (1)

Criteria for checking the condition of main components.

11-4. Trouble criterion of main parts (2)

Criteria for checking the condition of main components.

11-5. Troubleshooting flow

Step-by-step diagnostic procedures for various issues.

M Electromagnetic noise enters into TV sets or radios

Troubleshooting steps for electromagnetic noise interference.

N Check of power supply

Procedure to check the power supply to the outdoor unit.

P Check of R.V. coil

Diagnostic steps for the reversing valve coil.

Q Check of LEV

Procedure to check the electronic expansion valve (LEV).

R How to check inverter/ compressor

Steps for checking the inverter and compressor functionality.

S Check of outdoor thermistors

Procedure for checking the resistance of outdoor thermistors.

T Check of outdoor fan motor

Steps to diagnose issues with the outdoor fan motor.

U Check of HPS

Procedure for checking the high-pressure switch (HPS).

V Check of current-limiting resistor

Steps to check the current-limiting resistor and its relay.

a How to check inverter/compressor

Detailed checks for inverter and compressor operation.

b Check of open phase

Procedure to check for open phases in the compressor output.

c Check of compressor

Steps to verify compressor operation and winding.

d Check of compressor winding

Method to measure compressor winding resistance.

e Check of compressor operation time

Procedure to measure compressor operation time until overcurrent stop.

f Check of compressor start failure

Steps to diagnose compressor start failure issues.

g Check of outdoor thermistors

Procedure for checking outdoor thermistor resistance.

h Check of R.V. coil

Diagnostic steps for the R.V. coil.

i Check of outdoor fan motor

Procedure to check the outdoor fan motor.

J Check of power supply

Steps to verify the power supply to the unit.

k Check of LEV

Procedure to check the electronic expansion valve (LEV).

Check of inverter P.C. board

Steps to diagnose issues with the inverter P.C. board.

How to check miswiring and serial signal error

Troubleshooting steps for wiring and communication errors.

11-6. Test point diagram and voltage

11-6-1. Inverter P.C. board

Test points and voltage details for the inverter PC board.

11-6-2. Inverter P.C. board

Test points and voltage details for the inverter PC board.

11-6-3. Inverter P.C. board

Test points and voltage details for the inverter PC board.

11-6-4. Outdoor electronic control P.C. board

Test points and voltage details for the outdoor electronic control PC board.

11-6-5. Noise filter P.C. board

Test points and voltage details for the noise filter PC board.

11-6-6. Outdoor power board

Test points and voltage details for the outdoor power board.

12 DISASSEMBLY INSTRUCTIONS

1. Removing the cabinet

Instructions for removing the outer cabinet panels.

2. Removing the inverter assembly, inverter P.C. board

Steps to remove the inverter assembly and associated boards.

3. Removing R.V. coil

Procedure for removing the reversing valve coil.

5. Removing outdoor fan motor

Steps for removing the outdoor fan motor assembly.

6. Removing the compressor and 4-way valve

Procedure for removing the compressor and 4-way valve.

7. Removing the reactor

Steps for removing the reactor component.

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