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Mitsubishi Electric MSZ-FT25VG-E1 User Manual

Mitsubishi Electric MSZ-FT25VG-E1
44 pages
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INDOOR UNIT
PARTS CATALOG (OBB864)
CONTENTS
1. TECHNICAL CHANGES ······························2
2. PART NAMES AND FUNCTIONS ··················3
3. SPECIFICATION ········································4
4. NOISE CRITERIA CURVES ··························5
5. OUTLINES AND DIMENSIONS ·····················6
6. WIRING DIAGRAM ·····································7
7. REFRIGERANT SYSTEM DIAGRAM ··········· 10
8. SERVICE FUNCTIONS ······························ 11
9. MICROPROCESSOR CONTROL ················ 13
10. TROUBLESHOOTING ······························· 22
11. DISASSEMBLY INSTRUCTIONS ················· 36
SERVICE MANUAL
No. OBH864
Models
MSZ-FT25VG
-
E1
MSZ-FT25VGK
-
E1
,
ET1
,
SC1
MSZ-FT35VG
-
E1
MSZ-FT35VGK
-
E1
,
ET1
,
SC1
MSZ-FT50VG
-
E1
MSZ-FT50VGK
-
E1
,
ET1
,
SC1
Outdoor unit service manual
MUZ-FT∙VG Series (OBH865)

Table of Contents

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Mitsubishi Electric MSZ-FT25VG-E1 Specifications

General IconGeneral
BrandMitsubishi Electric
ModelMSZ-FT25VG-E1
CategoryAir Conditioner
LanguageEnglish

Summary

Technical Changes

New Model

Details new model introductions and changes in specifications or features.

Part Names and Functions

Accessories

Lists all included accessories with the indoor unit for proper installation and operation.

Specification

Specifications and Rated Conditions of Main Electric Parts

Provides detailed electrical and operational specifications, including ratings for main components.

Noise Criteria Curves

Outlines and Dimensions

Wiring Diagram

Refrigerant System Diagram

Service Functions

8-1. Timer Short Mode

Allows shortening of timer settings for service purposes, affecting ON/OFF and compressor start times.

8-2. How to Set Remote Controller Exclusively for a Particular Indoor Unit

Guides on setting remote controller exclusivity for specific indoor units in multi-unit setups.

8-3. Auto Restart Function

Explains how the unit remembers and resumes operation settings after a power interruption.

8-4. Wi-Fi Interface Setting Up

Instructions for connecting the Wi-Fi interface to a network for remote monitoring and control.

8-5. Changing the Correction Value of the Room Temperature

Procedure to adjust room temperature correction value during heating operation for better comfort.

Microprocessor Control

Wireless Remote Controller Operation

Overview of the wireless remote controller, its sections, and signal transmission details.

9-1. Cool () Operation

Details the operation, modes, and specific functions during cooling cycles.

9-2. Dry (0) Operation

Explains the function and operation modes specific to the dry (dehumidification) mode.

9-3. Fan (3) Operation

Describes the fan-only operation mode, where the outdoor unit remains off.

9-4. Heat (0) Operation

Outlines the operating procedures and modes for heating cycles.

9-5. Auto Changeover ... Auto Mode Operation

Explains automatic switching between COOL and HEAT modes based on room temperature.

9-6. Auto Vane Operation

Details the automatic adjustment and control of horizontal and vertical vane positions.

9-7. Timer Operation

Instructions on setting and using the ON and OFF timers for automated operation.

9-8. Weekly Timer Operation

Programming daily and weekly schedules for unit operation to optimize comfort and energy.

9-9. Night Mode () Operation

Describes the NIGHT MODE function, which reduces noise and adjusts indicator brightness.

9-10. i-save (3) Operation

Procedure for saving and recalling custom settings for temperature, fan speed, and airflow.

9-11. Circulator Operation

Explains the FAN operation mode that circulates indoor air after reaching the set temperature.

9-12. Emergency/Test Operation

How to use the emergency operation switch for testing or when the remote is unavailable.

9-13. 3-Minute Time Delay Operation

Describes the compressor protection feature that delays restart for 3 minutes after shutdown.

Troubleshooting

10-1. Cautions on Troubleshooting

Important safety and procedural precautions to follow before and during troubleshooting.

10-2. Failure Mode Recall Function

Method to recall and diagnose past abnormal conditions using indicator lamps and remote signals.

10-3. Instruction of Troubleshooting

A systematic flowchart guiding the diagnosis process based on unit operation and indicator lamp behavior.

2. Check of Wi-Fi Interface (MSZ-FT-VGK)

Step-by-step guide to troubleshoot issues with Wi-Fi connectivity and smartphone control.

10-4. Troubleshooting Check Table

Correlates indicator lamp patterns with abnormal conditions and their corresponding remedies.

10-5. Trouble Criterion of Main Parts

Details methods for checking and verifying the condition of key internal components.

10-6. Troubleshooting Flow

A systematic approach to diagnose issues based on unit operation and indicator lamp behavior.

B Check of Remote Controller and Indoor Electronic Control P.C. Board

Procedure to check the remote controller's functionality and its interaction with the indoor P.C. board.

C Check of Indoor P.C. Board and Indoor Fan Motor

Steps to inspect and test the indoor P.C. board and indoor fan motor for faults.

D How to Check Miswiring and Serial Signal Error

Guide to identify and resolve issues related to incorrect wiring or communication errors.

E Electromagnetic Noise Enters into TV Sets or Radios

Troubleshooting steps for electromagnetic interference affecting TV sets and radios.

10-7. Test Point Diagram and Voltage

Provides diagrams of P.C. boards with test points and expected voltage readings for diagnosis.

Disassembly Instructions

1. Removing the Panel

Step-by-step guide for safely removing the front panel and related covers.

3. Removing the Nozzle Assembly and the Vane Motor

Instructions for disassembling the nozzle assembly and vane motor components.

4. Removing the Vertical Vane Motor Unit

Guide for removing the vertical vane motor unit from the air conditioner assembly.

5. Removing the Horizontal Vane Motor

Steps to detach and remove the horizontal vane motor from its mounting.

6. Removing the Indoor Fan Motor, the Indoor Coil Thermistor and the Line Flow Fan

Instructions for removing the fan motor, thermistor, and line flow fan assembly.

2. Removing the Wi-Fi Interface

Procedure for detaching and removing the Wi-Fi interface module from the unit.

3. Removing the Indoor Electrical Box

Steps to remove the indoor electrical box housing internal wiring and components.

4. Removing the Indoor Terminal P.C. Board, Display P.C. Board, Switch/Buzzer P.C. Board, Receiver P.C. Board

Guide for disassembling various internal P.C. boards and their associated components.

5. Removing the Nozzle Assembly and the Vane Motor

Steps for disassembling the nozzle assembly and vane motor for specific models.

6. Removing the Vertical Vane Motor Unit

Guide for removing the vertical vane motor unit for specific models.

7. Removing the Horizontal Vane Motor

Instructions to detach and remove the horizontal vane motor for specific models.

8. Removing the Indoor Fan Motor, the Indoor Coil Thermistor and the Line Flow Fan

Steps for removing the fan motor, thermistor, and line flow fan for specific models.

Fixing the Indoor Coil Thermistor

Procedure for correctly mounting the indoor coil thermistor using clip or holder parts.

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