Mitsubishi Electric PAC-MK33BC - User Manual

March 2018
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
CONTENTS
1. SAFETY PRECAUTION ······································· 2
2. OVERVIEW OF UNIT ··········································· 5
3. SPECIFICATIONS ················································ 9
4. OUTLINES AND DIMENSIONS ···························10
5. WIRING DIAGRAM ············································· 12
6 . NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION············· 13
7. TROUBLESHOOTING ········································ 17
8. DISASSEMBLY PROCEDURE ··························· 26
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 (OCB664)
[Service Ref.]
PAC-MK53BC
PAC-MK53BCB
PAC-MK33BC
PAC-MK33BCB
[Model Name]
<Branch box>
PAC-MK53BC
PAC-MK53BCB
PAC-MK33BC
PAC-MK33BCB
PAC-MK53BC
No. OCH664

Summary

Safety Precautions

Refrigerant Handling Cautions

Cautions for handling R410A refrigerant, including pipe preparation, tools, and charging.

Service Cautions and Tools

Refrigerant Piping Work Cautions

Pipe Thickness and Flare Dimensions

Specifications for pipe thickness and flare dimensions for R410A refrigerant.

R410 A Tools and Materials Compatibility

Compatibility of R410A tools with conventional tools and required materials.

Specifications

Model Specifications Comparison

Technical specifications for PAC-MK53BC, PAC-MK33BC, PAC-MK53BCB, and PAC-MK33BCB models.

Wiring Diagrams

Wiring Diagrams and Symbols

Wiring diagrams for branch boxes and explanations of symbols and components.

Refrigerant System Diagram

Diagrams and Capillary Tube Specs

Troubleshooting

Part Checking Procedures

Procedures for checking thermistors and linear expansion valves for faults.

Troubleshooting Details

Component Troubleshooting Details

Disassembly Procedures

Controller Cover and Under Panel Removal

Steps for removing the controller cover and under panel.

Thermistor Removal

Procedure for removing the thermistor from the gas pipe.

Component Removal Procedures

LEV Coil Removal

Controller Board Removal

Component Assembly Procedures

LEV Assembly and Pipe Box Disassembly

Mitsubishi Electric PAC-MK33BC Specifications