Mitsubishi MUZ-EF25VE User Manual

SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS ····················· 4
3. SPECIFICATION ················································ 5
4. NOISE CRITERIA CURVES ······························ 6
5. OUTLINES AND DIMENSIONS ························ 8
6. WIRING DIAGRAM ············································ 9
7. REFRIGERANT SYSTEM DIAGRAM ··············11
8. PERFORMANCE CURVES ····························· 13
9. ACTUATOR CONTROL ··································· 27
10. SERVICE FUNCTIONS ···································· 28
11. TROUBLESHOOTING ····································· 28
12. DISASSEMBLY INSTRUCTIONS ···················· 45
Models
SPLIT-TYPE AIR CONDITIONERS
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
HFC
utilized
R410A
No. OBH590
OUTDOOR UNIT
Indoor unit service manual
MSZ-EF•VE Series (OBH589)
PARTS CATALOG (OBB590)
MUZ-EF25VE MUZ-EF25VEH
MUZ-EF35VE MUZ-EF35VEH
MUZ-EF42VE
MUZ-EF25VE -
E1
MUZ-EF25VEH -
E1
MUZ-EF35VE -
E1
MUZ-EF35VEH -
E1
MUZ-EF42VE -
E1
MUZ-EF50VE -
E1

Mitsubishi MUZ-EF25VE Specifications

General

Category	Air Conditioner
Type	Wall Mounted
Cooling Capacity	2.5 kW
Heating Capacity	3.2 kW
Power Supply	220-240 V, 50 Hz
Outdoor Unit Dimensions (HxWxD)	550 x 800 x 285 mm
Refrigerant	R32
Energy Efficiency Class (Cooling)	A+++
Energy Efficiency Class (Heating)	A++
Sound Level (Indoor)	19 dB
Operating Temperature Range (Cooling)	-10 to 46°C
Operating Temperature Range (Heating)	-15 to 24°C

Summary

Technical Changes

Part Names and Functions

Specification

Noise Criteria Curves

Outlines and Dimensions

Wiring Diagram

Refrigerant System Diagram

Performance Curves

8-1. Capacity and Input Curves

Presents cooling capacity and input data for various models and conditions.

8-2. Capacity and Input Correction by Operational Frequency of Compressor

Shows how compressor operational frequency affects capacity and input correction factors.

8-3. How to Operate Fixed-Frequency Operation

Details the procedure for operating the unit at a fixed frequency.

8-4. Outdoor Low Pressure and Outdoor Unit Current

Displays charts for outdoor low pressure and unit current under cooling operation.

Actuator Control

9-1. Outdoor Fan Motor Control

Explains the control logic for the outdoor fan motor linked to compressor operation.

9-2. R.V. Coil Control

Describes the control operation for the reversing valve coil in cooling and heating modes.

9-3. Relation Between Main Sensor and Actuator

Illustrates the interaction between sensors and actuators for unit control.

Service Functions

10-1. Change in Defrost Setting

Provides instructions for adjusting the defrost finish temperature setting.

10-2. Pre-Heat Control Setting

Explains the pre-heat control function to prevent compressor start-up issues.

Troubleshooting

11-1. Cautions on Troubleshooting

Lists important precautions and checks before starting troubleshooting.

11-2. Failure Mode Recall Function

Details the procedure for recalling and diagnosing past failure modes.

3. Outdoor unit failure mode table

A table listing outdoor unit failure modes, LED indications, conditions, and remedies.

11-3. Troubleshooting Check Table

A table outlining symptoms, LED indications, abnormal points, conditions, and remedies.

11-4. Trouble Criterion of Main Parts

Specifies resistance criteria for main parts to diagnose malfunctions.

11-5. Troubleshooting Flow

Provides step-by-step diagnostic flowcharts for various troubleshooting scenarios.

11-6. Test Point Diagram and Voltage

Illustrates test points and voltage measurements on the inverter P.C. board.

Electromagnetic noise enters into TV sets or radios

Disassembly Instructions

12-1. MUZ-EF25VE MUZ-EF25VEH MUZ-EF35VE MUZ-EF35VEH MUZ-EF42VE

Step-by-step instructions for disassembling the cabinet and components for specific models.

12-2. MUZ-EF50VE

Detailed steps for disassembling the cabinet and components for the MUZ-EF50VE model.