Mitsubishi Electric MUZ-FH35VE User Manual

SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS ····················· 3
3. SPECIFICATION ················································ 4
4. NOISE CRITERIA CURVES ······························ 6
5. OUTLINES AND DIMENSIONS ························ 7
6. WIRING DIAGRAM ············································ 8
7. REFRIGERANT SYSTEM DIAGRAM ··············· 9
8. PERFORMANCE CURVES ····························· 10
9. ACTUATOR CONTROL ··································· 19
10. SERVICE FUNCTIONS ···································· 20
11. TROUBLESHOOTING ····································· 20
12. DISASSEMBLY INSTRUCTIONS ···················· 37
Models
SPLIT-TYPE AIR CONDITIONERS
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
HFC
utilized
R410A
No. OBH625
OUTDOOR UNIT
Indoor unit service manual
MSZ-FH•VE Series (OBH623)
PARTS CATALOG (OBB625)
MUZ-FH25VEHZ
-
E1
MUZ-FH35VEHZ
-
E1

Mitsubishi Electric MUZ-FH35VE Specifications

General

Cooling Capacity	3.5 kW
Heating Capacity	4.0 kW
Energy Efficiency Rating (Cooling)	A+++
SEER	8.5
Power Supply	220-240 V, 50 Hz
Coefficient of Performance (Heating)	4.0
Refrigerant	R32
Dimensions (Outdoor Unit)	780×285×540 mm
Type	Split System Air Conditioner
Indoor Noise Level	19 dB(A)

Summary

Technical Changes

New Model Introduction

Details the introduction of a new model version.

Part Names and Functions

Specification

Noise Criteria Curves

Outlines and Dimensions

Wiring Diagram

Refrigerant System Diagram

Performance Curves

Capacity and Input Curves

Presents curves for cooling capacity and input power.

Capacity and Input Correction by Operational Frequency

Shows how compressor frequency affects capacity and input.

Fixed-Frequency Operation Guide

Guides on using test run and emergency operation modes.

Outdoor Low Pressure and Unit Current

Details unit current and low pressure under various conditions.

Actuator Control

Outdoor Fan Motor Control

Explains fan motor operation linked to compressor status.

R.V. Coil Control

Describes reversing valve coil operation in cooling and heating.

Sensor to Actuator Relationship

Maps sensor inputs to actuator outputs for system control.

Service Functions

Change in Defrost Setting

Instructions for adjusting the defrost finish temperature setting.

Pre-Heat Control Setting

How to enable pre-heat control for low-temperature operation.

Troubleshooting

Cautions on Troubleshooting

Essential safety and preparatory advice before troubleshooting.

Failure Mode Recall Function

Method for recalling and interpreting stored fault codes.

Troubleshooting Check Table

Table correlating symptoms, LED codes, conditions, and remedies.

Trouble Criterion of Main Parts

Specifies resistance and voltage criteria for key components.

Troubleshooting Flow

Step-by-step procedures for diagnosing specific component failures.

Test Point Diagram and Voltage

Diagrams showing test points and expected voltage/resistance values.

Disassembly Instructions

Removing the Cabinet

Procedure for removing the outer cabinet and service panel.

Removing the Inverter Assembly and P.C. Board

Steps to remove the inverter assembly and its main board.

Removing the R.V. Coil

Instructions for removing the reversing valve coil.

Removing Temperature Sensors

Procedures for removing various thermistors from the unit.

Removing Outdoor Fan Motor

Steps to remove the outdoor fan motor and propeller.

Removing Compressor and 4-Way Valve

Guide for removing the compressor and the 4-way valve.