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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
[Model Name]
<Branch box>
PAC-MK54BC
PAC-MK34BC
BRANCH BOX
[Service Ref.]
PAC-MK54BC
PAC-MK34BC
PAC-MK54BC
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
PARTS CATALOG (OCB744)
HFC
utilized
R410A
May 2020
No. OCH744
Note:
• This service manual
describes technical data of
branch box. As for indoor
units and outdoor unit,
refer to its service manual.
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Summarization of Contents
Safety Precautions
R410A Refrigerant Handling Cautions
Safety guidelines for handling R410A refrigerant, including preparation and procedures.
Service and Piping Work Cautions
Important considerations for performing service and refrigerant piping work safely.
Refrigerant Charging and Service Tools
Procedures for refrigerant charging and recommended tools for servicing.
Refrigerant Piping Work Specifics
Detailed cautions and specifications for refrigerant piping installation and handling.
Overview of Unit
System Outline, Example, and Identification
System overview, configuration example, and model identification methods.
Installation Space Requirements
Specifies the necessary clearances for installation and maintenance of the branch box.
Simplified Piping System Configurations
Illustrates simplified piping configurations for single and multiple branch boxes.
Specifications
Technical Specifications
Detailed technical data including model, electrical, and physical specifications of the branch boxes.
Outlines and Dimensions
Dimensional Drawings and Pipe Connections
Visual representation of unit dimensions and refrigerant pipe connection details for different models.
Wiring Diagram
Electrical Wiring Diagrams and Symbols
Detailed wiring diagrams and explanations of symbols used in the system for wiring connections.
Necessary Conditions for System Construction
Transmission System Setup and Addressing
Instructions for setting up transmission systems, including M-NET and remote controller connections and addressing.
Refrigerant System Diagrams and Components
Visual representation of refrigerant circuits and key components like LEV and strainers.
Control System Operation and Limitations
System operation, display differences, timer controls, and group setting limitations.
Troubleshooting
Component Checking Procedures
Procedures for checking specific parts like thermistors and LEV for malfunctions.
Linear Expansion Valve (LEV) Operation
Details on LEV operation, including pulse signals, valve movement, and sounds.
LEV Coil Attachment and Detachment
Step-by-step instructions for removing and installing the LEV coil.
Expansion Valve Troubleshooting
Common problems with expansion valves, their checks, and corrective measures.
Test Point Diagram for Controller Board
Diagram showing test points and component locations on the branch box controller board for diagnostics.
Internal Switch Functions and Settings
Explains the purpose and configuration of internal switches for system setup and operation.
Operation Monitor Function and Data
Details on using the operation monitor for status checks, error codes, and data displays.
Disassembly Procedure
Controller, Panel, and Thermistor Removal
Steps to remove the controller cover, under panel, and thermistors for access.
LEV Coil and Controller Board Removal
Steps to remove the linear expansion valve (LEV) coil and the controller board.
LEV Assembly and Pipe Box Disassembly
Procedures for removing the LEV assembly and disassembling the pipe box.
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