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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
<Outdoor unit>
[Model Name]
MXZ-8B140VA
MXZ-8B160VA
MXZ-8B140YA
MXZ-8B160YA
OUTDOOR UNIT
[Service Ref.]
MXZ-8B140VA
MXZ-8B160VA
MXZ-8B140YA
MXZ-8B160YA
Model name
indication
CONTENTS
1. SAFETY PRECAUTION ······································ 2
2. OVERVIEW OF UNITS ········································ 5
3. SPECIFICATIONS ············································· 12
4. DATA ·································································· 13
5. OUTLINES AND DIMENSIONS ························ 17
6. WIRING DIAGRAM ············································ 18
8. TROUBLESHOOTING ······································· 22
9. ELECTRICAL WIRING ······································ 56
10. WIRING SPECIFICATIONS . ······························ 58
11. SYSTEM CONTROL ·········································· 59
12. REFRIGERANT PIPING TASK·························· 61
13. DISASSEMBLY PROCEDURE ·························· 64
INDOOR UNITS COMBINATION SHEETS
PARTS CATALOG (OCB480)
March 2014
No. OCH480
REVISED EDITION-D
HFC
utilized
R410A
Revision:
• Added connectable indoor unit
MFZ-KJ25VE,
MFZ-KJ35VE, and
MFZ-KJ50VE in REVISED
EDITION-D.
• Some descriptions have
been modified.
• P lease void OCH480
REVISED EDITION-C.
NOTE:
• This service manual
describes technical data
of outdoor unit. As for
indoor units and branch
box (OCH508), refer to its
service manual.
• RoHS compliant products
have <G> mark on the spec
name plate.
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Table of Contents
Troubleshooting
Related Manuals for Mitsubishi MXZ-8B160YA
Summarization of Contents
Technical & Service Manual
Revision Information
Details changes and updates for the current edition of the manual.
Key Notes and Cautions
Highlights essential information and warnings for proper operation and service.
Safety Precautions
General Safety Observances
Fundamental safety rules to follow before accessing or servicing the unit.
R410A Refrigerant Handling Cautions
Specific safety measures and precautions for using R410A refrigerant.
Installation Guidelines
Outdoor Unit Installation Location
Guidance on selecting an appropriate and safe location for the outdoor unit installation.
Ventilation and Service Space Requirements
Specifies necessary clearances and airflow considerations for outdoor unit installation.
System Overview and Combination Examples
System Construction Details
Describes the components and structure of the air conditioning system.
Typical Combination Examples
Illustrates common configurations of outdoor and indoor units for various applications.
Piping System and Connection Methods
Piping Connection Sizes
Specifies the required pipe sizes for liquid and gas refrigerant lines.
Flare Connection Installation
Explains the process and advantages of using flare connections without brazing.
Unit Specifications
Standard Performance Data
Details cooling and heating capacities, power consumption, and operating currents.
Component Specifications
Lists specifications for components like compressor, fan, and heat exchanger.
Specification Notes
Provides important notes and conditions related to the unit specifications.
Capacity Calculation Methods
System Capacity Calculation Method
Details the process for determining total system cooling and heating capacity.
Indoor Unit Capacity Calculation
Provides the formula and method for calculating the capacity of individual indoor units.
Capacity Correction Factors
Air Condition Correction Factors
Illustrates how air temperature and humidity affect cooling and heating capacity.
Piping Length Correction Factors
Provides curves to adjust capacity based on the corrected piping length.
Noise Criterion Curves
Noise Level Measurement Setup
Illustrates the microphone placement for measuring sound pressure levels.
Octave Band Sound Pressure Levels
Displays sound pressure levels across various frequency bands for cooling and heating.
Unit Outlines and Dimensions
Installation Clearances
Specifies required free space around the unit for proper installation and maintenance.
Service Space and Foundation
Details the space needed for service access and requirements for foundation bolts.
Wiring Diagram and Component Identification
Electrical Wiring Diagram
Visual representation of the unit's electrical connections and circuit layout.
Component Symbols and Descriptions
Explains the meaning of various symbols used in the wiring diagram and component names.
Model Select Switch Settings
Describes the function and settings of the model select DIP switch.
Refrigerant System Construction
Refrigerant System Diagram
Visual schematic of the refrigerant flow and components within the system.
Pipe Size and Branch Box Connections
Details pipe sizes and connection methods for branch boxes and indoor units.
Troubleshooting
Test Run Procedures
Steps and precautions for performing test runs on the outdoor unit and indoor units.
Self-Diagnosis and Error Codes
Detailed tables for identifying faults using check codes and corresponding actions.
Troubleshooting Common Problems
Addresses common operational phenomena and their causes and countermeasures.
Special Functions and Settings
On-Site Modification Functions
Details modifications for low noise mode and demand function using external inputs.
Operation Monitoring and Control Functions
Describes functions for monitoring operations and controlling modes via external signals.
Component Checking Procedures
Thermistor Resistance Checks
Instructions for checking the resistance of thermistors under specified conditions.
Solenoid Valve Coil and Motor Checks
Procedures for checking the resistance of solenoid valve coils and motor windings.
Circuit Board Layouts
Outdoor Controller Circuit Board Layout
Illustrates the layout and test points of the main outdoor unit controller board.
Outdoor Power and Converter Circuit Board Layouts
Shows the layout of the power and converter circuit boards, including connection points.
Switch, Connector, and Jumper Functions
DIP Switch Functions
Details the operations and settings for DIP switches SW1 and SW4.
Connector and Jumper Functions
Describes the roles of specific connectors and jumpers in system operation.
Operation Monitoring and Error Codes
Outdoor Unit Operation Monitor Function
Details the function of the digital indicator LED3 for displaying operational status.
Error Code Inspection (During Operation)
Lists error codes related to operational faults and their corresponding inspection points.
Error Code Inspection (Power On)
Lists error codes that appear upon power-on and their related causes.
SW2 Setting for Display Parameters
Displaying Operational Data
Details how SW2 settings control the display of temperature, current, frequency, etc.
Displaying Error History and Codes
Describes how SW2 is used to view error postponement codes and check code histories.
Remote Controller Functions
Setting Unit Functions via Remote Controller
Details the available functions and their settings that can be configured using the remote controller.
Electrical Wiring Procedures
External Wiring Procedure
Details the steps for connecting power supply and communication lines to the outdoor unit.
Wiring Specifications for Connecting Cables
Specifies cable types, sizes, and lengths for connecting outdoor to branch boxes.
System Control Configurations
Basic System Configurations
Shows fundamental ways to connect outdoor units, branch boxes, and indoor units.
Standard System Configurations
Depicts standard setups including single and multiple branch box connections.
Incorrect System Configurations
Invalid Group Operation Scenarios
Illustrates incorrect ways to group indoor units or connect different refrigerant systems.
M-NET Adapter Connection Restrictions
Specifies limitations regarding the connection of M-NET adapters to outdoor units.
Refrigerant Piping Tasks
Additional Refrigerant Charge Calculation
Details how to calculate and add refrigerant based on piping length and system configuration.
Refrigerant Piping Length and Height Limits
Specifies maximum permissible lengths and height differences for refrigerant pipes.
Refrigerant Handling Procedures
Refrigerant Collecting (Pump Down) Procedure
Step-by-step guide for safely collecting refrigerant from the system.
Refrigerant Refilling and Safety
Information on refilling refrigerant and safety precautions during handling.
Refrigerant Leakage Precautions
R410A Leakage Prevention
Information on R410A concentration limits and how to ensure room safety.
Confirming R410A Concentration
Steps to calculate refrigerant concentration and take necessary actions if limits are exceeded.
Disassembly Procedures
Removing Panels, Fan Motor, and Electrical Box
Guides on removing the service panel, top panel, fan motor, and electrical box.
Removing Thermistors and Valves
Instructions for removing thermistors, solenoid valves, and bypass valves.
Removing Switches and Sensors
Details the steps for removing high/low pressure switches and the high pressure sensor.
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