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Mitsubishi Electric MSZ-FD25VA Service Manual

Mitsubishi Electric MSZ-FD25VA
40 pages
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CONTENTS
1. TECHNICAL CHANGES ····································3
2. PART NAMES AND FUNCTIONS······················4
3. SPECIFICATION·················································5
4. NOISE CRITERIA CURVES·······························6
5. OUTLINES AND DIMENSIONS ·························7
6. WIRING DIAGRAM ············································7
7. REFRIGERANT SYSTEM DIAGRAM················8
8. SERVICE FUNCTIONS ······································9
9. MICROPROCESSOR CONTROL ····················11
10. TROUBLESHOOTING······································20
11. DISASSEMBLY INSTRUCTIONS·····················36
MSZ-FD25VA -
MSZ-FD25VAS -
MSZ-FD35VA -
MSZ-FD35VAS -
E1
E1
E1
E1
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
Outdoor unit service manual
MUZ-FD·VA Series(OBH489)
MXZ-A·VA Series (OB377)
MXZ-8A140A (OC316)
SERVICE MANUAL
Wireless type
Models
No. OBH488
INDOOR UNIT
PARTS CATALOG (OBB488)
OBH488-1.qxp 07.8.9 11:47 AM Page 1

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Mitsubishi Electric MSZ-FD25VA Specifications

General IconGeneral
Cooling Capacity2.5 kW
Heating Capacity3.2 kW
Power Supply220-240 V, 50 Hz
RefrigerantR410A
Indoor Unit Weight10 kg
TypeWall Mounted
Indoor Unit Dimensions (W x H x D)798 x 295 x 257 mm
Outdoor Unit Dimensions (W x H x D)780 x 550 x 290 mm

Summary

1. Technical Changes

2. Part Names and Functions

Included Accessories

Lists included accessories such as installation plates, screws, and remote controller holder.

3. Specifications

Main Electric Part Specifications

Details electrical data, dimensions, performance ratings, and main electric part specifications.

5. Outlines and Dimensions

6. Wiring Diagram

7. Refrigerant System Diagram

8. Service Functions

Timer Short Mode

Shortens set time for service operations via short-circuiting specific points on the P.C. board.

PC Board Modification for Individual Operation

Modifies indoor unit P.C. boards for individual operation of multiple units with wireless remotes.

Auto Restart Function

Restores operation to previous settings after power interruption.

Remote Controller Slide Switch Adjustment

Adjusts slide switch in remote for correct indoor unit installation position and air direction.

9. Microprocessor Control

Wireless Remote Controller Layout

Details buttons and functions of the wireless remote controller.

Indoor Unit Lamp Indications

Explains the meaning of the indicator lamps on the indoor unit for operation status.

Cool and Dry Operation Modes

Describes COOL, DRY modes, coil frost prevention, and low outside temperature operation.

Heat Operation Modes

Details HEAT mode, cold air prevention, high pressure protection, and defrosting.

Auto Vane Operation

Controls horizontal vane movement for optimal air distribution in various modes.

i-see Control Operation

Uses i-see sensor to measure temperatures for automatic comfort adjustment.

Plasma Operation

Activates plasma deodorizing and air purifying features.

Timer Operation

Sets ON and OFF timers for automatic unit operation.

Emergency/Test Operation

Allows unit operation via emergency switch for service or when remote is unavailable.

10. Troubleshooting

Cautions on Troubleshooting

Provides safety precautions and checks before performing troubleshooting.

Remote Controller Battery Replacement

Instructions on replacing remote controller batteries and resetting the unit.

Horizontal Vane Installation

Guidance on correctly installing the horizontal vane to prevent indicator lamp blinking.

Failure Mode Recall Function

Recalls and displays past abnormal conditions for diagnosis.

Plasma Operation Failure Mode Recall

Recalls failure modes specific to the plasma operation.

Indoor Unit Failure Mode Table

Table correlating POWER lamp blinking patterns to indoor unit abnormalities.

Plasma Operation Failure Mode Table

Table correlating POWER lamp blinking patterns to plasma operation abnormalities.

Troubleshooting Flowchart Instruction

Flowchart guiding diagnosis based on operation status and indicator lamps.

Troubleshooting Check Table

Comprehensive table of symptoms, conditions, and correspondence for troubleshooting.

Trouble Criterion of Main Parts

Checks methods and criteria for diagnosing main component failures.

Troubleshooting Flow: Indoor Fan Motor

Step-by-step troubleshooting for indoor fan motor errors.

Remote Controller and PC Board Check

Diagnoses issues with the remote controller and indoor electronic control P.C. board.

Indoor PC Board and Fan Motor Check

Checks indoor PC board and fan motor for faults.

Miswiring and Serial Signal Error Check

Guides checking for miswiring and serial signal communication errors.

Plasma Operation Check

Specific check for plasma operation issues.

Test Point Diagram and Voltage

Provides diagrams and voltage values for testing components on the P.C. board.

Power Monitor Receiver PC Board

Details the power monitor receiver P.C. board.

Monitor PC Board

Details the monitor P.C. board.

Plasma Power PC Board

Details the plasma power P.C. board.

11. Disassembly Instructions

Removing the Panel

Step-by-step guide to remove the front panel and its components.

Removing Electronic Boards and Terminal Block

Instructions to remove P.C. boards, sensor, and terminal block.

Removing the Electrical Box

Procedure for removing the electrical box.

Removing the Vertical Vane Motor Unit

Instructions for removing the vertical vane motor unit.

Removing the Horizontal Vane Motor

Steps to remove the horizontal vane motor unit.

Removing Indoor Fan Motor and Line Flow Fan

Guide to remove the indoor fan motor and the line flow fan.

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