Mitsubishi Electric City Multi PKFY-P08NHMU-E2 User Manual

TECHNICAL & SERVICE MANUAL
CONTENTS
1. PART NAMES AND FUNCTIONS
..........
2
2. SPECIFICATION
.....................................
5
3. OUTLINES AND DIMENSIONS
..............
7
4. WIRING DIAGRAM
.................................
8
5. REFRIGERANT SYSTEM DIAGRAM
..........
9
6. MICROPROCESSOR CONTROL
.........
10
7. TROUBLESHOOTING
..........................
15
8. DISASSEMBLY PROCEDURE
.............
22
Indoor unit
[Model names] [Service Ref.]
PKFY-P08NHMU-E2
PKFY-P08NHMU-E2
PKFY-P12NHMU-E2
PKFY-P12NHMU-E2
PKFY-P15NHMU-E2
PKFY-P15NHMU-E2
PKFY-P18NHMU-E2
PKFY-P18NHMU-E2
No. OCH515
INDOOR UNIT
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
R22R410A
Note:
• This manual describes
only service data of the
indoor units.
• RoHS compliant products
have <G> mark on the
spec name plate.
April 2012
PARTS CATALOG (OCB515)

Mitsubishi Electric City Multi PKFY-P08NHMU-E2 Specifications

General

Brand	Mitsubishi Electric
Model	City Multi PKFY-P08NHMU-E2
Category	Air Conditioner
Language	English

Summary

Specifications

General Specifications

Wiring Diagram

Indoor Unit Wiring Schematics

Microprocessor Control

Indoor Unit Control Modes Overview

Explains thermostat, fan, and vane control logic for various operation modes.

Cool Operation Details

Heat Operation Details

Troubleshooting

Component Resistance and Thermistor Checks

Provides methods to check thermistors, vane motors, and LEV resistance.

Thermistor Characteristics and Graph

Linear Expansion Valve Operation and Troubleshooting

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

DC Fan Motor Troubleshooting

Outlines checks for wiring, power supply, sensor signals, and fuse for DC fan motor issues.

Dip Switch Functions and Settings

Test Point Diagram and Board Locations

Disassembly Procedure

Unit Panel Removal Steps

Instructions for removing the lower side of the unit and the front panel.

Controller Board and Electrical Box Removal

Steps to remove indoor controller board, wireless controller board, and electrical box.

Internal Component Removal

Detailed steps for removing nozzle assembly, fan motor, vane motor, and thermistors.

Heat Exchanger and LEV Removal

Instructions for removing the heat exchanger, LEV, and room temperature thermistor.