Table of Contents
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SPLIT-TYPE AIR CONDITIONERS
SERVICE MANUAL
Models
MFZ-KA25VA -
MFZ-KA25VA -
MFZ-KA25VA -
MFZ-KA25VA -
MFZ-KA35VA -
MFZ-KA35VA -
MFZ-KA35VA -
MFZ-KA35VA -
NOTE:
• This service manual describes technical data of the indoor units.
• RoHS compliant products have <G> mark on the spec name plate.
For servicing of RoHS compliant products, refer to the RoHS Parts List.
E1
MFZ-KA50VA -
E2
MFZ-KA50VA -
E3
MFZ-KA50VA -
E4
E1
E2
E3
E4
CONTENTS
MFZ-KA25VA
MFZ-KA35VA
MFZ-KA50VA
10. TROUBLESHOOTING ····································· 23
11. DISASSEMBLY INSTRUCTIONS ···················· 37
12. PARTS LIST ····················································· 41
13. RoHS PARTS LIST ·········································· 45
14. OPTIONAL PARTS ·········································· 49
MFZ-KA25VA-
, MFZ-KA35VA-
E4
MFZ-KA50VA-
have been added.
E4
Please void OB409 REVISED EDITION-C.
REVISED EDITION-D
Outdoor unit service manual
SUZ-KA•VA(H) Series (OC322)
MXZ-A•VA Series (OB377, OC316)
1. TECHNICAL CHANGES ··································· 2
2. PART NAMES AND FUNCTIONS ····················· 3
3. SPECIFICATION ················································ 5
4. NOISE CRITERIA CURVES ······························ 7
5. OUTLINES AND DIMENSIONS ························ 8
6. WIRING DIAGRAM ············································ 9
7. REFRIGERANT SYSTEM DIAGRAM ············· 10
8. PERFORMANCE CURVES ····························· 10
9. SERVICE FUNCTIONS ··································· 21
and
E4
No. OB409
E1
E2
E3
E4
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Table of Contents
Troubleshooting
Related Manuals for Mitsubishi Electric MFZ-KA50VA - E4MFZ-KA35VA
Summarization of Contents
Part Names and Functions
Indoor Unit
Identifies and labels components of the indoor unit, including vanes, filters, and controls.
Performance Curves
Cooling Operation
Details cooling performance data, capacity factors, and total input under various conditions.
Heating Operation
Details heating performance data, capacity factors, and total input under various conditions.
Service Functions
Timer Short Mode
Allows shortening of timer settings for service purposes by short-circuiting specific points.
P.C. Board Modification for Individual Operation
Modifies P.C. boards to allow individual unit control with multiple remote controllers.
Auto Restart Function
Enables the unit to automatically restart with memorized settings after power restoration.
Troubleshooting
Cautions on Troubleshooting
Provides essential safety and preparatory steps before performing troubleshooting procedures.
Failure Mode Recall Function
Recalls and displays past abnormal conditions, useful for intermittent faults.
Indoor Unit Failure Mode Table
Lists blinking patterns of the operation indicator lamp and their corresponding failure modes.
Instruction of Troubleshooting
Offers a systematic guide and flowcharts for diagnosing unit malfunctions.
Troubleshooting Check Table
A table correlating symptoms, check points, and countermeasures for various abnormalities.
Trouble Judgement Criteria of Main Parts
Details methods for testing key internal components like thermistors and motors.
Troubleshooting Flow
Provides diagnostic flowcharts to identify the root cause of specific operational issues.
Check of Indoor Fan Motor (Upper)
Specific steps to diagnose issues with the upper indoor fan motor.
Check of Indoor Fan Motor (Lower)
Specific steps to diagnose issues with the lower indoor fan motor.
Check of Remote Controller and Receiver P.C. Board
Diagnostic steps to identify problems with the remote control system.
Check of Indoor Electronic Control P.C. Board and Indoor Fan Motor
Diagnosing issues related to the main control board and fan motors.
How to Check Mis-wiring and Serial Signal Error
Guides on identifying and resolving mis-wiring and communication signal errors.
Check of Damper
Procedures to diagnose and test the operation of the unit's damper.
Test Point Diagram and Voltage
Identifies test points and voltage readings on the electronic control P.C. board.
Disassembly Instructions
Removing the Panel
Instructions for safely removing the front panel of the indoor unit.
Removing the Electronic Control P.C. Board and the Display Receiver P.C. Board
Steps to remove the main electronic and display receiver boards.
Removing the Electrical Box
Procedure for removing the unit's electrical box.
Removing the Horizontal Vane Motor Unit
Steps to remove the horizontal vane motor assembly.
Removing the Indoor Fan Motor (Upper)
Instructions for removing the upper indoor fan motor.
Removing the Damper Lock Motor, the Damper Motor and the Damper Limit Switch
Detailed steps for removing damper control components.
Removing the Indoor Fan Motor (Lower)
Instructions for removing the lower indoor fan motor.
Parts List (non-RoHS compliant)
Indoor Unit Structural Parts
Lists major structural components of the indoor unit.
Accessory and Remote Controller
Lists included accessories and the remote controller.
Indoor Unit Electrical Parts and Functional Parts
Lists electrical and functional internal parts of the indoor unit.
Indoor Unit Heat Exchanger
Lists parts related to the indoor unit's heat exchanger.
RoHS Parts List (RoHS compliant)
Indoor Unit Structural Parts
Lists structural parts for RoHS compliant indoor units.
Accessory and Remote Controller
Lists accessories and remote controller for RoHS compliant models.
Indoor Unit Electrical Parts and Functional Parts
Lists electrical and functional parts for RoHS compliant units.
Indoor Unit Heat Exchanger
Lists heat exchanger parts for RoHS compliant units.
Optional Parts
Air Cleaning Filter (Anti-Allergy Enzyme Filter)
Details the air cleaning filter, its replacement, and maintenance procedures.
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