Mitsubishi Electric PLH-3GKHB1.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-3GKHB1.UK Specifications

General

Category	Air Conditioner
Cooling Capacity	3.5 kW
Heating Capacity	4.0 kW
Energy Efficiency Ratio (EER)	3.21
Coefficient of Performance (COP)	3.61
Power Supply	220-240 V, 50 Hz
Refrigerant	R32
Outdoor Unit Noise Level	50 dB(A)

Summary

1 FEATURES

2 PART NAMES AND FUNCTIONS

4 DATA

1) COOLING CAPACITY

Performance data for cooling capacity under various conditions.

2) HEATING CAPACITY

Performance data for heating capacity under various conditions.

6 WIRING DIAGRAM

7 REFRIGERANT SYSTEM DIAGRAM

PLH-3GK(H)B1.UK/PUH-3VKA2.UK

Refrigerant circuit diagram for specific indoor and outdoor unit combinations.

8 OPERATION FLOW-CHART

MAIN OPERATION

Overall operational logic and sequence of the air conditioner.

COOLING OPERATION

Detailed flowchart for the cooling mode operation.

DRY OPERATION

Detailed flowchart for the dry mode operation.

HEATING OPERATION

Detailed flowchart for the heating mode operation.

AUTOMATIC COOLING/HEATING OPERATION

Flowchart for automatic mode switching between cooling and heating.

9 MICROPROCESSOR CONTROL

2. INDOOR UNIT CONTROL

Controls for the indoor unit, including operation modes and settings.

3. OUTDOOR UNIT CONTROL

3-3 Protective functions

Details on protective functions that stop unit operation in case of issues.

3-4 COOL/HEAT operation time chart

Time charts illustrating the operation sequence for COOL and HEAT modes.

3-5 Defrosting in HEAT mode

Explanation of the defrosting process and its conditions in heating mode.

3-7 Service functions

Special service functions like compulsory defrosting and fixed fan output.

10 TROUBLESHOOTING

1.TROUBLES IN TEST RUN

Common issues encountered during test runs and their solutions.

2. SELF DIAGNOSTIC FUNCTION WITH REMOTE CONTROLLER

How to use the remote controller for self-diagnosis and error code interpretation.

4. TROUBLESHOOTING ACCORDING TO CHECK CODE

5. WHEN OUTDOOR UNIT DOES NOT WORK

Troubleshooting steps when the outdoor unit fails to operate.

12 SYSTEM CONTROL

2. GROUP CONTROL WITH A SINGLE REMOTE CONTROLLER

How to control multiple units with a single remote controller.

3. CONTROL USING TWO REMOTE CONTROLLERS : OPTIONAL REMOTE CNTROLLER (PAC-SK47RC)

Using two remote controllers for unit operation and control.

4. REMOTE ON-OFF AND INDIVIDUAL REMOTE CONTROLS

Methods for controlling units via remote ON/OFF switch and individual remote controls.

5. INDIVIDUAL CONTROL BY GROUPING THE REMOTE CONTROLLERS

6. MULTIPLE REMOTE CONTROL DISPLAY