Mitsubishi Electric SUZ-KA25VA User Manual

TECHNICAL & SERVICE MANUAL
No.OC322
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
R410A
Outdoor unit
[model names] [Service Ref.]
SUZ-KA25VA SUZ-KA25VA.TH SUZ-KA25VAR1.TH
SUZ-KA35VA SUZ-KA35VA.TH SUZ-KA35VAR1.TH
SUZ-KA25VAH SUZ-KA25VAH.TH SUZ-KA25VAHR1.TH
SUZ-KA35VAH SUZ-KA35VAH.TH SUZ-KA35VAHR1.TH
SUZ-KA50VA SUZ-KA50VA.TH
SUZ-KA50VA1.TH
SUZ-KA50VAR2.TH
SUZ-KA60VA SUZ-KA60VA.TH
SUZ-KA60VA1.TH
SUZ-KA60VAR2.TH
SUZ-KA71VA SUZ-KA71VA.TH
SUZ-KA71VA1.TH
CONTENTS
1. COMBINATION OF INDOOR AND OUTDOOR UNITS
.......
2
2. TECHNICAL CHANGES
....................................
3
3. PART NAMES AND FUNCTIONS
......................
7
4. SPECIFICATION
.................................................
8
5. NOISE CRITERIA CURVES
..............................
12
6. OUTLINES AND DIMENSIONS
........................
13
7. WIRING DIAGRAM
...........................................
15
8. REFRIGERANT SYSTEM DIAGRAM
..............
23
9. PERFORMANCE CURVES
..............................
29
10. ACTUATOR CONTROL
....................................
57
11. SERVICE FUNCTIONS
.....................................
58
12. TROUBLESHOOTING
......................................
58
13. DISASSEMBLY INSTRUCTIONS
...................
103
14. PARTS LIST
....................................................
113
15. RoHS PARTS LIST
.........................................
119
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-KA25VA(H).TH SUZ-KA25VA(H)R1.TH
SUZ-KA35VA(H).TH SUZ-KA35VA(H)R1.TH
April 2009
REVISED EDITION-E
Revision:
•
SUZ-KA25/35VA(H)R1.TH
are added in REVISED
EDITION-E.
• Some descriptions
have been modified.
• Please void OC322
REVISED EDITION-D.

Mitsubishi Electric SUZ-KA25VA Specifications

General

Category	Air Conditioner
Model	SUZ-KA25VA
Cooling Capacity	2.5 kW
Heating Capacity	3.2 kW
Power Supply	220-240 V, 50 Hz
Outdoor Unit Noise Level	49 dB(A)

Summary

Combination of Indoor and Outdoor Units

Technical Changes

Part Names and Functions

Specification

Noise Criteria Curves

Outlines and Dimensions

Wiring Diagram

Refrigerant System Diagram

Performance Curves

Actuator Control

Outdoor Fan Motor Control

Controls outdoor fan motor operation based on compressor status.

R.V. Coil Control

Manages the reversing valve coil for heating and cooling modes.

Sensor and Actuator Relation

Maps sensors to actuators for proper system operation.

Service Functions

Defrost Setting Adjustment

Adjusts defrost finish temperature via jumper wire modification.

Troubleshooting

Troubleshooting Cautions

Essential safety and procedural notes before diagnosing issues.

Failure Mode Recall

Recalls and displays the unit's recorded failure history.

Trouble Criterion of Main Parts (1)

Defines criteria for diagnosing common component failures.

How to Check Inverter/Compressor

Guides diagnosis of inverter and compressor operational issues.

How to Check Miswiring and Serial Signal Error

Diagnoses issues related to wiring and communication failures.

Electromagnetic Noise Issues

Addresses electromagnetic noise interference with external devices.

Disassembly Instructions

Removing the Cabinet

Step-by-step guide for removing the outdoor unit's outer casing.

Removing Inverter and Power Boards

Procedures for safely removing main electronic boards.

Removing Compressor and 4-Way Valve

Instructions for removing major refrigeration cycle components.

Parts List

Outdoor Unit Electrical Parts

Lists electrical components for the outdoor unit, including part numbers.

Outdoor Unit Structural Parts

Lists structural and functional components of the outdoor unit with part numbers.

Drain Socket and Accessories

Lists part numbers for drain socket and other accessories.

RoHS Parts List

RoHS Outdoor Unit Electrical Parts

Lists RoHS compliant electrical components for the outdoor unit.

RoHS Outdoor Unit Structural Parts

Lists RoHS compliant structural and functional components for the outdoor unit.

RoHS Drain Socket and Accessories

Lists RoHS compliant part numbers for drain socket and accessories.