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Mitsubishi Electric MXZ-8B140VA - User Manual

Mitsubishi Electric MXZ-8B140VA
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TECHNICAL & SERVICE MANUAL
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
CONTENTS
1. SAFETY PRECAUTION
······································
2
2. OVERVIEW OF UNITS ········································ 5
3. SPECIFICATIONS
·············································
12
4. DATA ·································································· 13
5. OUTLINES AND DIMENSIONS ························ 16
6. WIRING DIAGRAM ············································ 17
7.
NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION
··· 19
8. TROUBLESHOOTING
·······································
21
9. ELECTRICAL WIRING ······································ 54
10. WIRING SPECIFICATIONS
.
······························ 56
11. SYSTEM CONTROL
··········································
57
12. REFRIGERANT PIPING TASK·························· 59
13. DISASSEMBLY PROCEDURE ·························· 62
INDOOR UNITS COMBINATION SHEETS
No. OCH480
REVISED EDITION-A
[Model name]
[Service Ref.]
<Outdoor unit>
MXZ-8B140VA MXZ-8B140VA
MXZ-8B160VA MXZ-8B160VA
MXZ-8B140YA MXZ-8B140YA
MXZ-8B160YA MXZ-8B160YA
HFC
utilized
R410A
September 2011
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.
OUTDOOR UNIT
Model name
indication
PARTS CATALOG (OCB480)
Revision:
• Errors in "3.
SPECIFICATIONS"
have been corrected in
REVISED EDITION-A.
• Some descriptions have
been modified.
Please void OCH480.

Questions and Answers

  • J
    Jenna DavisAug 1, 2025
    What to do if the Mitsubishi Electric MXZ-8B140VA Air Conditioner trouble is reoccurring and error code is displayed?
    • G
      garysimpsonAug 1, 2025
      If the trouble with your Mitsubishi Electric Air Conditioner is reoccurring and an error code is displayed, assess the issue and take corrective action according to the “8-3. SELF-DIAGNOSIS ACTION TABLE”.
  • H
    Hannah VaughanAug 8, 2025
    What to do if the Mitsubishi Electric MXZ-8B140VA trouble is reoccurring and error code is not displayed?
    • J
      Joshua RodriguezAug 9, 2025
      If the trouble with your Mitsubishi Electric Air Conditioner is reoccurring but no error code is displayed, conduct troubleshooting to ascertain the cause of the problem according to “8-4. TROUBLESHOOTING BY INFERIOR PHENOMENA”.
  • D
    danny44Aug 16, 2025
    What to do if the Mitsubishi Electric MXZ-8B140VA Air Conditioner trouble is not reoccurring but is logged?
    • S
      Sarah JohnsonAug 16, 2025
      If the Mitsubishi Electric Air Conditioner trouble is not reoccurring but is logged, it may be due to temporary defects such as the operation of protection devices in the refrigerant circuit including the compressor, poor wiring connections, or noise. To address this, re-check the symptom and inspect the installation environment, refrigerant amount, and weather conditions when the trouble occurred, as well as anything related to the wiring. After completing these checks, reset the error code logs and restart the unit.
  • W
    wramirezAug 25, 2025
    What to do if the Mitsubishi Electric MXZ-8B140VA Air Conditioner trouble is not reoccurring and not logged?
    • D
      David MartinAug 25, 2025
      If the trouble with your Mitsubishi Electric Air Conditioner is not reoccurring and not logged, re-check the abnormal symptom. Conduct troubleshooting to ascertain the cause of the trouble according to “8-4. TROUBLESHOOTING BY INFERIOR PHENOMENA”. If the cause is not ascertained, continue to operate the unit for the time being.

Summary

Safety Precautions

Always Observe For Safety

Essential safety guidelines during unit operation and servicing.

Cautions Related to New Refrigerant

Specific warnings and precautions for handling new refrigerants like R410A.

Unit Overview

Construction of System

Details on the system's overall construction and components.

System Outline and Identification

Overview of the system's operational flow and model identification.

Typical Combination Example

Illustrates common combinations of indoor and outdoor units.

Installation Procedures

Outdoor Unit Installation Location

Proper placement criteria for outdoor units to ensure performance.

Ventilation and Service Space Requirements

Specifies necessary clearances for airflow and maintenance access.

Specifications and Data

Standard Performance Specifications

Key performance data including capacity, power, and current ratings.

Guaranteed Operating Range

Defines the operational limits for cooling and heating.

Capacity Correction Factors

Adjusting cooling/heating capacity based on air conditions.

Wiring and System Control

Wiring Diagram

Visual representation of electrical connections for the system.

System Control Basics

Explains basic system configurations with indoor units and branch boxes.

Refrigerant Management

Additional Refrigerant Charge Procedures

Guidelines for adding refrigerant based on piping length.

Precautions Against Refrigerant Leakage

Safety measures and concentration limits for refrigerant leakage.

Troubleshooting and Maintenance

Troubleshooting Guide

General procedures for diagnosing and resolving unit issues.

Self-Diagnosis Action Table

Error codes, faults, and corrective actions.

How to Check Parts

Procedures for testing individual components.

Mitsubishi Electric MXZ-8B140VA Specifications

General IconGeneral
SeriesMXZ
Cooling Capacity14.0 kW
Heating Capacity16.0 kW
Indoor Units SupportedUp to 8
TypeMulti-Split System

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