Mitsubishi Electric PKFY-P18NLMU-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-P18NLMU-E Specifications

General

Brand	Mitsubishi Electric
Model	PKFY-P18NLMU-E
Category	Air Conditioner
Language	English

Summary

SAFETY PRECAUTIONS

Refrigerant Handling and General Cautions

Safety guidelines for using R410A refrigerant, including piping, tools, and cylinder handling.

Service Safety and Tool Requirements

Cautions for service personnel, including refrigerant collection and specific tools for R410A.

PARTS NAMES AND FUNCTIONS

SPECIFICATIONS

Model Specifications: Capacity and Dimensions (PKFY-P04 to P08)

Model Specifications: Capacity and Dimensions (PKFY-P12 to P18)

WIRING DIAGRAM

Indoor Unit Electrical Connections

Schematic illustrating the wiring of the indoor unit, including component connections.

REFRIGERANT SYSTEM DIAGRAM

Refrigerant Circuit Components and Flow

TROUBLESHOOTING AND TESTING

Component Resistance and Continuity Testing

Procedures for checking resistance of thermistors, motors, and continuity of connections.

Fan Motor and Controller Board Diagnostics

Troubleshooting steps for DC fan motors and the indoor controller board.

Linear Expansion Valve Operation and Troubleshooting

Explanation of LEV operation, pulse signals, and troubleshooting steps for valve issues.

DIP Switch Functions and Settings

Controller Board Test Points and PCB Layouts

Diagram of test points on the indoor controller board and layouts of related PCBs.

DISASSEMBLY PROCEDURE

Removing Front Panel and Electrical Covers

Step-by-step instructions for removing the front panel, corner box, and electrical covers.

Removing Controller Boards and PCBs

Removing Fan Motor and Heat Exchanger Assembly

Instructions for disassembling the fan motor, line flow fan, and heat exchanger.

Removing Thermistors and LEV