Mitsubishi Electric PAC-MK34BC - User Manual

May 2020
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
CONTENTS
1. SAFETY PRECAUTION ··································· 2
2. OVERVIEW OF UNIT ······································ 5
3. SPECIFICATIONS ·········································· 8
4. OUTLINES AND DIMENSIONS ························· 9
5. WIRING DIAGRAM ········································10
6 . NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION ············ 11
7. TROUBLESHOOTING ····································15
8. DISASSEMBLY PROCEDURE ························· 24
BRANCH BOX
HFC
utilized
R410A
Note:
• This service manual
describes technical data of
branch box. As for indoor
units and outdoor unit,
refer to its service manual.
PARTS CATALOG (OCB744)
PAC-MK54BC
No. OCH744
[Service Ref.]
PAC-MK54BC
PAC-MK34BC
[Model Name]
<Branch box>
PAC-MK54BC
PAC-MK34BC

Summary

SAFETY PRECAUTION

Cautions Related to New Refrigerant

Safety advice for R410A refrigerant, including preparation and service.

Service Cautions and Procedures

Cautions for service, refrigerant charging, tool usage, and piping work.

Refrigerant Piping Work Details

Cautions, dimensions, and tools for refrigerant piping installation with R410A.

WIRING DIAGRAM

Detailed Wiring Diagrams

Provides detailed wiring diagrams for PAC-MK54BC and PAC-MK34BC models.

NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION

Transmission System Setup

TROUBLESHOOTING

Thermistor and LEV Checks

Procedures for checking thermistor resistance and LEV continuity.

LEV Troubleshooting Procedures

Common problems with LEVs and their corrective measures.

Test Point Diagram

Internal Switch Functionality

Unit Operation Monitor Function

DISASSEMBLY PROCEDURE

Removing Thermistor and LEV

Mitsubishi Electric PAC-MK34BC Specifications