Mitsubishi Mr.SLIM PUH18EK User Manual

TECHNICAL & SERVICE MANUAL
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
CONTENTS
1. FEATURES························································2
2. TECHNICAL CHANGE······································3
3. COMBINATION OF INDOOR AND OUTDOOR UNITS ··············4
4. PART NAMES AND FUNCTIONS·····················4
5. SPECIFICATIONS ·············································5
6. DATA··································································6
7. OUTLINES AND DIMENSIONS ························8
8. WIRING DIAGRAM··········································11
9. REFRIGERANT SYSTEM DIAGRAM ···················15
10. MICROPROCESSOR CONTROL ···················16
11. TROUBLESHOOTING·····································20
12. DISASSEMBLY INSTRUCTIONS····················25
13. PARTS LIST ····················································29
<Outdoor unit>
Models
Outdoor unit
TM
PUH18EK
PUH24EK PUH24EK
1
PUH30EK PUH30EK1 PUH30EK2
PUH36EK PUH36EK1 PUH36EK2
PUH42EK PUH42EK1
PUH42EK7 PUH42EK71
No. OC245
REVISED EDITION-C
L
I
S
T
E
D
CUS
•The contents of LD6 in Main functions of LED
(page 13) have been revised.
•The contents of LD5 and LD6 in
TROUBLESHOOTING ACCORDING TO
CHECK CODE (page 22) have been revised.
•Refer to other manual as for Indoor Units.
•Please void OC247 REVISED EDITION-B.
OC245-C--1.qxp 02.12.19 9:58 AM Page 1

Mitsubishi Mr.SLIM PUH18EK Specifications

General

Brand	Mitsubishi
Model	Mr.SLIM PUH18EK
Category	Air Conditioner
Language	English

Summary

1 FEATURES

REDI-CHARGED REFRIGERANT SYSTEM

Industry's first redi-charged system eliminates refrigerant adjustment for up to 100ft piping.

HIGH RELIABILITY AND EASY SERVICING

Features self-diagnostic, time delay, auto-restart, emergency operation, and test run functions.

FOUR-WAY PIPING ACCESS FOR EASY INSTALLATION

Allows piping connection from four directions, offering installation flexibility.

FRONT-ACCESS FOR SIMPLIFIED MAINTENANCE

Front panel design allows easy access for maintenance, removable with two screws.

5 SPECIFICATIONS

6 DATA

Additional Refrigerant Charge

Table showing additional refrigerant charge based on piping length.

Compressor Technical Data

Table with compressor technical data, including winding resistance.

7 OUTLINES AND DIMENSIONS

8 WIRING DIAGRAM

PUH18EK Model Wiring Diagram

Wiring diagram specific to the PUH18EK model.

9 REFRIGERANT SYSTEM DIAGRAM

10 MICROPROCESSOR CONTROL

Outdoor Unit Control Logic

Details outdoor fan control and outdoor unit ON/OFF operation.

Protective Functions Overview

Explains protective functions like reversed-phase, open-phase, and controller abnormality.

5 Defrosting in HEAT mode

Defrosting Time Chart

Defrosting Start Conditions

11 TROUBLESHOOTING

Service Data Indication via Outdoor Controller Board Switches

How to use switches and LEDs for service data indication and check codes.

Troubleshooting by Check Code

Troubleshooting based on LED blinking codes and their causes.

Outdoor Unit Not Working Causes

4 WRONG WIRING ON SITE

Indoor to Outdoor Unit Wiring Phenomena

5 HOW TO CHECK THE PARTS