Mitsubishi Electric MUZ-FH25VEHZ User Manual

SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS ····················· 3
3. SPECIFICATION ················································ 4
4. NOISE CRITERIA CURVES ······························ 7
5. OUTLINES AND DIMENSIONS ························ 8
6. WIRING DIAGRAM ············································ 9
7. REFRIGERANT SYSTEM DIAGRAM ··············11
8. PERFORMANCE CURVES ····························· 13
9. ACTUATOR CONTROL ··································· 24
10. SERVICE FUNCTIONS ···································· 25
11. TROUBLESHOOTING ····································· 26
12. DISASSEMBLY INSTRUCTIONS ···················· 48
Models
SPLIT-TYPE AIR CONDITIONERS
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
HFC
utilized
R410A
No. OBH625
REVISED EDITION-A
OUTDOOR UNIT
Indoor unit service manual
MSZ-FH•VE Series (OBH623)
PARTS CATALOG (OBB625)
MUZ-FH25VEHZ
-
E1
MUZ-FH35VEHZ
-
E1
MUZ-FH50VEHZ
-
E1
Please void OBH625.
Revision A:
• MUZ-FH50VEHZ-
E1
has been added.
MUZ-FH25VEHZ
MUZ-FH35VEHZ

Mitsubishi Electric MUZ-FH25VEHZ Specifications

General

Cooling Capacity	2.5 kW
Heating Capacity	3.2 kW
Seasonal Energy Efficiency Ratio (SEER)	9.1
Power Supply	220-240 V, 50 Hz
Outdoor Unit Noise Level	46 dB(A)
Refrigerant	R32
Dimensions (Outdoor Unit)	800 x 550 x 285 mm
Weight (Outdoor Unit)	35 kg
Energy Efficiency Class Cooling	A+++
Energy Efficiency Class Heating	A++
Indoor Unit Noise Level (Min)	19 dB(A)
Outdoor Unit Dimensions (WxHxD)	800 x 550 x 285 mm
Outdoor Unit Weight	35 kg

Summary

Outdoor Unit Service Manual

Models Covered

Lists the specific Mitsubishi Electric outdoor unit models included in this manual.

Refrigerant Handling and Safety

Use Specified Refrigerant Only

Emphasizes the importance of using only the specified refrigerant to prevent unit damage or hazards.

Repair Service Precautions

Specifications

MUZ-FH25VEHZ Specifications

Provides detailed technical data for the MUZ-FH25VEHZ model.

MUZ-FH35VEHZ Specifications

Provides detailed technical data for the MUZ-FH35VEHZ model.

Specifications (Continued)

MUZ-FH50VEHZ Specifications

Provides detailed technical data for the MUZ-FH50VEHZ model.

Wiring Diagram

MUZ-FH25/35VEHZ Wiring Diagram

Schematic illustrating the electrical connections for MUZ-FH25/35VEHZ models.

Wiring Diagram (Continued)

MUZ-FH50VEHZ Wiring Diagram

Schematic illustrating the electrical connections for the MUZ-FH50VEHZ model.

Refrigerant System Diagrams

MUZ-FH25/35VEHZ Refrigerant System

Diagram showing the refrigerant circuit for MUZ-FH25/35VEHZ models.

MUZ-FH50VEHZ Refrigerant System

Diagram showing the refrigerant circuit for the MUZ-FH50VEHZ model.

Cooling Performance Data Tables

Cooling Performance Data Tables (Continued)

MUZ-FH25VEHZ Cooling Data

Detailed tables of cooling performance data for MUZ-FH25VEHZ.

MUZ-FH35VEHZ Cooling Data

Detailed tables of cooling performance data for MUZ-FH35VEHZ.

MUZ-FH50VEHZ Cooling Data

Detailed tables of cooling performance data for MUZ-FH50VEHZ.

Heating Performance Data Tables

MUZ-FH25/35/50VEHZ Heating Data

Detailed tables of heating performance data for all covered models.

Troubleshooting Overview

Cautions on Troubleshooting

Important safety measures and preliminary checks before troubleshooting.

Troubleshooting Procedure

Outdoor Unit Failure Mode Recall

Detailed Flowchart

Step-by-step process for recalling specific outdoor unit failure modes.

Outdoor Unit Failure Modes

Outdoor Unit Failure Mode Table

A table listing failure modes, symptoms, conditions, and remedies.

Troubleshooting Check Table

Troubleshooting Check Table (Continued)

Symptom-Based Troubleshooting

Continuation of the table correlating operational symptoms with faults and solutions.

Troubleshooting Flows

How to Check Inverter/Compressor

Flowchart for diagnosing issues related to the inverter and compressor.

Check of Open Phase

Check of Compressor

Power Supply Checks

Power Supply Diagnosis

Flowchart for checking power supply voltage and related components.

Inverter P.C. Board Checks

Inverter P.C. Board Diagnosis

Flowchart for diagnosing faults related to the inverter P.C. board.

Wiring and Signal Error Checks

Miswiring and Signal Error Check (MUZ-FH25/35)

Troubleshooting steps for miswiring and serial signal errors in MUZ-FH25/35.

Wiring and Signal Error Checks (Continued)

Miswiring and Signal Error Check (MUZ-FH50)

Troubleshooting steps for miswiring and serial signal errors in MUZ-FH50.

Disassembly Instructions

MUZ-FH25/35VEHZ Disassembly Procedures

Step-by-step guide for disassembling MUZ-FH25/35VEHZ outdoor units.

Disassembly Procedures (Continued)

Removing Outdoor Fan Motor

Removing Fan Motor

Removing Compressor and 4-Way Valve

Instructions for removing the compressor and 4-way valve.