Mitsubishi Electric PKFY-P04NLMU-E User Manual

TECHNICAL & SERVICE MANUAL
CONTENTS
1. SAFETY PRECAUTION
..........................
2
2. PARTS NAMES AND FUNCTIONS
........
4
3. SPECIFICATION
...................................
12
4. NOISE CRITERION CURVES
...............
15
5. OUTLINES AND DIMENSIONS
............
17
6. WIRING DIAGRAM
...............................
19
7. REFRIGERANT SYSTEM DIAGRAM
........
20
8. MICROPROCESSOR CONTROL
.........
20
9. TROUBLESHOOTING
..........................
27
10. DISASSEMBLY PROCEDURE
...........
35
Indoor unit
[Model Name] [Service Ref.]
INDOOR UNIT
R410A
Model name
indication
PARTS CATALOG (OCB715)
No. OCH715
March 2020
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
PKFY-P04NLMU-E
PKFY-P04NLMU-E.TH
PKFY-P06NLMU-E
PKFY-P06NLMU-E.TH
PKFY-P08NLMU-E
PKFY-P08NLMU-E.TH
PKFY-P12NLMU-E
PKFY-P12NLMU-E.TH
PKFY-P15NLMU-E
PKFY-P15NLMU-E.TH
PKFY-P18NLMU-E
PKFY-P18NLMU-E.TH
Note:
• This manual describes
service data of the indoor
units only.

Mitsubishi Electric PKFY-P04NLMU-E Specifications

General

Brand	Mitsubishi Electric
Model	PKFY-P04NLMU-E
Category	Air Conditioner
Language	English

Summary

Safety Precautions for Refrigerant Handling

Piping and Refrigerant Handling Precautions

Tool and General Safety Cautions

Specifications and Electrical Data

Wiring Diagram

Indoor Unit Wiring Connections

Refrigerant System and Microprocessor Control

8-1. COOL OPERATION

Explains the steps to operate the unit in cooling mode.

Control Modes and Functions

Details temperature adjustment, fan control, drain pump, and vane operations.

8-2. DRY OPERATION

8-3. FAN OPERATION

8-4. HEAT OPERATION

Heat Operation Control Details

8-5. AUTO OPERATION

Troubleshooting Procedures

9-1. HOW TO CHECK THE PARTS

Provides methods for checking resistance and continuity of various parts.

Thermistor Characteristics and Testing

Details thermistor characteristics and how to test them.

Linear Expansion Valve Operation and Testing

Explains linear expansion valve operation and connection testing.

DC Fan Motor Check Procedure

Outlines the steps to check the DC fan motor and related components.

Linear Expansion Valve Troubleshooting

Addresses issues like processor failure, locked valve, and incorrect connections.

9-2. FUNCTION OF DIP SWITCH

Address and Wireless Controller Settings

9-3. TEST POINT DIAGRAM

Crucial for diagnostics, maps test points on the indoor controller board.

PCB Test Points and Connections

Disassembly Procedures

1. Removing the Panel

Step-by-step guide to removing the front panel and corner box.

2. Removing the Electrical Box

Instructions for disconnecting connectors and removing the electrical box.

Removing Boards and Assemblies

Removing Fan Motor and Thermistors

Removing Heat Exchanger and Temperature Sensor