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Mitsubishi Electric MXZ-A14WV User Manual

Mitsubishi Electric MXZ-A14WV
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SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················6
3. INDOOR/OUTDOOR
CORRESPONDENCE TABLE ···························6
4. INDOOR UNITS COMBINATION ·······················9
5. SPECIFICATION···············································21
6. NOISE CRITERIA CURVES·····························23
7. OUTLINES AND DIMENSIONS ·······················24
8. WIRING DIAGRAM ··········································27
9. REFRIGERANT SYSTEM DIAGRAM··············30
10. PERFORMANCE CURVES······························33
11. MICROPROCESSOR CONTROL·····················47
12. TROUBLESHOOTING······································52
13. DISASSEMBLY INSTRUCTIONS·····················71
14. PARTS LIST······················································78
15. OPTIONAL PARTS···········································83
Inverter-controlled multi system type
Models
MXZ-A14WV -
MXZ-A18WV -
MXZ-A26WV -
MXZ-A32WV -
E1
E1
E1
E1
No. OB319
REVISED EDITION-A
HFC
utilized
R410A
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
MXZ-A18WV -
E1
Indication of model name
NOTE:
•This service manual describes technical data of outdoor units.
As for indoor units, refer to the service manual OB307 REVISED EDITION-C, OB321, OB327, OB329,
OB336 REVISED EDITION-A, OB345, OC302 or OC303.
Please void OB319.
Revision A:
MXZ-A14WV - has been added.
E1
OB319--1.qxp 04.8.5 9:41 AM Page 1
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Mitsubishi Electric MXZ-A14WV Specifications

General IconGeneral
BrandMitsubishi Electric
ModelMXZ-A14WV
CategoryAir Conditioner
LanguageEnglish

Summary

Technical Changes

Part Names and Functions

Outdoor Unit Components

Identifies major parts of the outdoor unit.

Accessories

Lists included accessories for outdoor units.

Indoor/Outdoor Compatibility

Shows compatible indoor and outdoor unit combinations.

Indoor Units Combination

Cooling and Heating Capacities

Tables detailing capacities for various indoor unit combinations.

Specification

MXZ-A14WV/A18WV Specifications

Technical specifications for MXZ-A14WV and MXZ-A18WV outdoor units.

MXZ-A26WV/A32WV Specifications

Technical specifications for MXZ-A26WV and MXZ-A32WV outdoor units.

Noise Criteria Curves

MXZ-A14WV/A18WV Noise Data

Sound pressure levels for MXZ-A14WV/A18WV across frequencies.

MXZ-A26WV/A32WV Noise Data

Sound pressure levels for MXZ-A26WV/A32WV across frequencies.

Outlines and Dimensions

MXZ-A14WV/A18WV Dimensions and Clearances

Physical dimensions and required clearances for MXZ-A14WV/A18WV.

MXZ-A26WV Dimensions and Clearances

Physical dimensions and required clearances for MXZ-A26WV.

MXZ-A32WV Dimensions and Clearances

Physical dimensions and required clearances for MXZ-A32WV.

Wiring Diagram

MXZ-A14WV/A18WV Outdoor Unit Wiring

Electrical wiring schematic for MXZ-A14WV/A18WV outdoor units.

MXZ-A26WV Outdoor Unit Wiring

Electrical wiring schematic for MXZ-A26WV outdoor unit.

MXZ-A32WV Outdoor Unit Wiring

Electrical wiring schematic for MXZ-A32WV outdoor unit.

Refrigerant System Diagram

MXZ-A14WV/A18WV Refrigerant Circuit

Schematic of the refrigerant circuit for MXZ-A14WV/A18WV.

MXZ-A26WV Refrigerant Circuit

Schematic of the refrigerant circuit for MXZ-A26WV.

MXZ-A32WV Refrigerant Circuit

Schematic of the refrigerant circuit for MXZ-A32WV.

Performance Curves

Interpreting Performance Curves

Explains how to interpret curves and measurement methods.

Capacity and Input Curves

MXZ-A14WV/A18WV Capacity/Input Curves

Cooling/heating capacity and input curves for MXZ-A14WV/A18WV.

MXZ-A26WV/A32WV Capacity/Input Curves

Cooling/heating capacity and input curves for MXZ-A26WV/A32WV.

Capacity and Input Correction by Inverter Output Frequency

MXZ-A14WV/A18WV Inverter Frequency Correction

Correction factors for capacity/input based on inverter frequency.

MXZ-A26WV/A32WV Inverter Frequency Correction

Correction factors for capacity/input based on inverter frequency.

Outdoor Low Pressure and Outdoor Unit Current

MXZ-A14WV/A18WV Pressure/Current Data

Curves showing outdoor low pressure and current vs. ambient conditions.

MXZ-A26WV/A32WV Pressure/Current Data

Curves showing outdoor low pressure and current vs. ambient conditions.

Microprocessor Control

Inverter Multi System Control Logic

Overview of the inverter multi system control logic.

Heat Defrosting Control Logic

Logic for entering and finishing defrosting mode in heat operation.

Discharge Temperature Protection

Controls compressor based on discharge temperature.

Refrigerant Recovery Control

Control logic for refrigerant recovery during heating.

Outdoor Fan Control Logic

Fan speed switching based on indoor units and compressor frequency.

Low Outside Temperature Operation

Controls rotation for outdoor heat exchanger temp in COOL mode.

Sensor and Actuator Relations

Maps sensors to actuators for system control.

Troubleshooting

Troubleshooting Cautions

Important safety and handling precautions before troubleshooting.

Troubleshooting Procedure Overview

Steps and general approach to troubleshooting unit issues.

Troubleshooting Check Table

Lists error codes (LEDs) and their corresponding symptoms and checks.

Component Diagnostic Checks

Guides for testing specific components like thermistors and motors.

Outdoor Unit Operation Faults

Diagnosing issues when the outdoor unit does not operate or has LED errors.

Specific Operation Faults

Troubleshooting steps for R.V. coil, LEV, and inverter/compressor issues.

Thermistor and Fan Motor Checks

Procedures for checking thermistor and fan motor functionality.

Frequency and Other System Issues

Troubleshooting frequency limits, HPS, and other system behaviors.

Disassembly Instructions

MXZ-A14WV/A18WV Outdoor Unit Disassembly

Step-by-step guide for disassembling MXZ-A14WV/A18WV outdoor units.

MXZ-A26WV/A32WV Outdoor Unit Disassembly

Step-by-step guide for disassembling MXZ-A26WV/A32WV outdoor units.

Parts List

Outdoor Unit Component Identification

Lists and illustrates functional, structural, and electrical parts of outdoor units.

Optional Parts

Different-diameter Pipe Options

Details different-diameter pipes for connecting indoor/outdoor units.

Outlet Guide Options

Information on the outlet guide for air discharge direction.

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