Mitsubishi Electric MSXY-FN18VE-R1 User Manual

PARTS CATALOG (OBB779)
SERVICE MANUAL
INDOOR UNIT
CONTENTS
1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS ····················· 4
3. SPECIFICATION ················································ 6
4. NOISE CRITERIA CURVE ································ 8
5. OUTLINES AND DIMENSIONS ······················ 10
6. WIRING DIAGRAM ··········································· 11
7. REFRIGERANT SYSTEM DIAGRAM ············· 12
8. SERVICE FUNCTIONS ··································· 13
9. MICROPROCESSOR CONTROL ··················· 15
10. TROUBLESHOOTING ····································· 21
11. DISASSEMBLY INSTRUCTIONS ···················· 38
No. OBH779
REVISED EDITION-C
MSXY-FN20VE MSXY-FN24VE
OBH779 REVISED EDITION-B is void.
Models
MSXY-FN07VE
-
R1
,
R2
MSXY-FN10VE
-
R1
,
R2
MSXY-FN13VE
-
R1
,
R2
MSXY-FN18VE
-
R1
,
R2
MSXY-FN20VE
-
R1
,
R2
MSXY-FN24VE
-
R1
,
R2
Revision C:
• The drawing of the printed circuit board of the remote
controller for MSXY-FN07/10/13/18/20/24VE-
R2
have
been corrected in 8. SERVICE FUNCTIONS.
Outdoor unit service manual
MXY-G·VA -
R
Series (OBH722)

Mitsubishi Electric MSXY-FN18VE-R1 Specifications

General

Brand	Mitsubishi Electric
Model	MSXY-FN18VE-R1
Category	Air Conditioner
Language	English

Summary

Service Functions

Timer Short Mode Function

PC Board Modification for Individual Operation

Modifies remote controller PC board for individual unit operation.

Microprocessor Control

I Feel Control Mode Operation

Auto Vane Operation Modes

Timer Operation Settings

Emergency and Test Operation

Explains emergency operation switch and test run procedures.

Troubleshooting

Troubleshooting Precautions

Provides essential precautions before starting troubleshooting.

Failure Mode Recall Functionality

Recalls and identifies past abnormal conditions of the unit.

Troubleshooting Instruction Flowchart

Guides users through diagnosing and resolving unit issues.

Troubleshooting Check Table

Lists abnormal points, symptoms, conditions, and remedies.

Main Parts Trouble Criteria

Details methods to check key components like thermistors and motors.

Indoor Fan Motor Troubleshooting Flow

Step-by-step guide for diagnosing indoor fan motor issues.

Check Miswiring and Serial Signal Errors

Procedure to diagnose wiring and communication errors.

MXY-2G20VA Communication Status Check

Verifies communication status indicators for specific outdoor units.

Horizontal Vane Installation Check

Guides on verifying correct installation of the horizontal vane.

Electromagnetic Noise Interference Issues

Test Point Diagram and Voltage References

Provides diagrams and voltage references for testing components.