Mitsubishi Electric PLH-4GKSB1.UK User Manual

TECHNICAL & SERVICE MANUAL
SPLIT-TYPE,HEAT PUMP AIR CONDITIONERS
CONTENTS
1. FEATURES ···········································3
2. PART NAMES AND FUNCTIONS········5
3. SPECIFICATIONS·································7
4. DATA ···················································11
5. OUTLINES AND DIMENSIONS··········15
6. WIRING DIAGRAM·····························18
7. REFRIGERANT SYSTEM DIAGRAM ······19
8. OPERATION FLOW-CHART··············20
9. MICROPROCESSOR CONTROL·······24
10. TROUBLESHOOTING························47
11. 4-WAY AIR FLOW SYSTEM···············55
12. SYSTEM CONTROL···························60
13. DISASSEMBLY PROCEDURE···········65
14. PARTS LIST········································68
15. OPTIONAL PARTS ·····························78
[Model names]
PLH-3GK(H)B
PLH-4GK(H)SB
PLH-5GK(H)SB
PLH-6GK(H)SB
No. OC148
1997
This manual does not cover the following
outdoor units. When servicing them,
please refer to the service manual
No.OC150 and this manual in a set.
[Service Ref.]
PUH-3YKA2.UK
PUH-3VKA2.UK
PUH-4YKSA2.UK
PUH-5YKSA2.UK
PUH-6YKSA2.UK
INDOOR UNIT
Ceiling Cassettes
Series PLH
FILTER
CHECK MODE
TEST RUN
REMOTE CONTROLLER
The Slim Line.
From Mitsubishi Electric.
[Service Ref.]
PLH-3GK(H)B 1 .UK
PLH-4GK(H)SB
1 .UK
PLH-5GK(H)SB
1 .UK
PLH-6GK(H)SB
1 .UK

Mitsubishi Electric PLH-4GKSB1.UK Specifications

General

Energy Efficiency Class (Cooling)	A++
Energy Efficiency Class (Heating)	A+
Indoor Unit Noise Level	21 dB(A)
Power Supply	220-240V, 50Hz
Noise Level (Outdoor Unit)	50 dB(A)
Refrigerant	R32

Summary

FEATURES

PART NAMES AND FUNCTIONS

Indoor Unit and Remote Controller Components

Identifies key parts of the indoor unit and the remote controller.

SPECIFICATIONS

Technical Specifications for Indoor and Outdoor Units

Provides detailed technical data for unit performance and dimensions.

PERFORMANCE DATA

Cooling, Heating Capacities, and Correction Factors

Presents performance data including capacities and factors affecting performance.

ELECTRICAL DATA

Electrical Specifications by Power Supply Configuration

Lists electrical data based on voltage and phase configurations.

OUTLINES AND DIMENSIONS

Indoor Unit Installation Dimensions and Details

WIRING DIAGRAM

System Electrical Wiring Schematics

Illustrates the electrical connections for the entire system.

REFRIGERANT SYSTEM DIAGRAM

Refrigerant Circuit and Component Flow

Shows the path of refrigerant through the system components.

OPERATION FLOW-CHARTS

Main, Cooling, Dry, and Heating Operation Logic

MICROPROCESSOR CONTROL SYSTEM

Control System Overview and Indoor Unit Control Modes

INDOOR UNIT CONTROL MODES

Cool, Dry, Heat, Auto, and Vane Operations

EMERGENCY OPERATION

Emergency Operation Guidance and Procedures

DIP SWITCH FUNCTIONS

Remote and Indoor Controller Dip Switch Settings

OUTDOOR UNIT CONTROL

Unit Operation, Protection, and Defrosting Logic

TROUBLESHOOTING

Test Run Issues and Self-Diagnostic Functions

Guides on troubleshooting common issues during test runs and using self-diagnostics.

MALFUNCTION CHECK CODES

Error Codes, Diagnosis, and Resolution Steps

Lists error codes and specific steps for diagnosing and resolving them.

TROUBLESHOOTING BY CHECK CODE

Specific Check Code Troubleshooting

Details troubleshooting steps based on specific blinking LED check codes.

WRONG WIRING ON SITE

Wiring Errors and Their Consequences

Identifies common wiring mistakes and their effects on unit operation.

4-WAY AIR FLOW SYSTEM

Air Outlet Placement and Flow Configuration

SYSTEM CONTROL OPTIONS

Overview of System Control Functions and Grouping

GROUP CONTROL WITH SINGLE REMOTE

Wiring and Addressing for Grouped Units

REMOTE CONTROL CONFIGURATIONS

Dual Remote and ON-OFF Control Methods

DISASSEMBLY PROCEDURE

Step-by-Step Internal Component Removal

CENTRALIZED REMOTE CONTROLLER

Controller Dimensions, Functions, and Settings