Mitsubishi Electric MXZ-4A71VA User Manual

SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ··································· 2
2. PART NAMES AND FUNCTIONS ····················· 8
3. INDOOR/OUTDOOR
CORRESPONDENCE TABLE ························ 10
4. INDOOR UNITS COMBINATION ···················· 14
5. SPECIFICATION ·············································· 61
6. NOISE CRITERIA CURVES ···························· 66
7. OUTLINES AND DIMENSIONS ······················ 68
8. WIRING DIAGRAM ·········································· 75
9. REFRIGERANT SYSTEM DIAGRAM ············· 87
10. PERFORMANCE CURVES ····························· 97
11. ACTUATOR CONTROL ··································115
12. SERVICE FUNCTIONS ···································116
13. TROUBLESHOOTING ··································· 120
14. DISASSEMBLY INSTRUCTIONS ·················· 145
15. PARTS LIST ··················································· 160
16. RoHS PARTS LIST ········································ 172
17. OPTIONAL PARTS ······················ BACK COVER
Models
MXZ-2A30VA -
E1
MXZ-4A71VA -
E2
MXZ-2A30VA -
E2
MXZ-4A71VA -
E3
MXZ-2A40VA -
E1
MXZ-4A71VA -
E4
MXZ-2A40VA -
E2
MXZ-4A71VA -
E5
MXZ-2A52VA -
E1
MXZ-4A71VA -
E6
MXZ-2A52VA -
E2
MXZ-4A71VA -
E7
MXZ-3A54VA -
E1
MXZ-4A80VA -
E1
MXZ-3A54VA -
E2
MXZ-4A80VA -
E2
MXZ-3A54VA -
E3
MXZ-5A100VA -
E1
MXZ-3A54VA -
E4
MXZ-3A54VA -
E5
MXZ-3A54VA -
E6
MXZ-3A54VA -
E7
MXZ-4A71VA -
E1
No. OB377
REVISED EDITION-H
HFC
utilized
R410A
SPLIT-TYPE AIR CONDITIONERS
MXZ-4A80VA-
E1
Please void OB377 REVISED EDITION-G.
OUTDOOR UNIT
Revision H:
• Indoor units combinations for 42 class
have been added.
•
MXZ-3A54VA-
E7
and MXZ-4A71VA-
E7
have been added.
NOTE:
• RoHS compliant products have <G> mark on the spec
name plate.
For servicing of RoHS compliant products, refer to the
RoHS Parts List.
Indoor unit service manual
MSZ-FA•VA Series (OB371)
MSZ-GA•VA Series (OB378, OB388)
MSZ-CB•VA Series (OB441)
MSZ-GC•VA Series (OBH468)
MSZ-GE•VA Series (OBH515)
MSZ-FD•VA Series (OBH488)

Mitsubishi Electric MXZ-4A71VA Specifications

General

Cooling Capacity	7.1 kW
Heating Capacity	8.0 kW
Power Supply	220-240 V, 50 Hz
Refrigerant	R410A
Number of Connectable Indoor Units	Up to 4
Type	Multi-Split System
Indoor Unit Dimensions (WxHxD)	Varies depending on the connected indoor unit model
Indoor Unit Weight	Varies depending on the connected indoor unit model
Indoor Unit Compatibility	Compatible with various Mitsubishi Electric indoor units

Summary

Technical Changes

Part Names and Functions

Indoor/Outdoor Correspondence Table

Indoor Units Combination

Specification

Noise Criteria Curves

Outlines and Dimensions

Wiring Diagram

Refrigerant System Diagram

MAX REFRIGERANT PIPING LENGTH

Specifies maximum refrigerant pipe length limits for indoor units and total system.

ADDITIONAL REFRIGERANT CHARGE

Details on calculating and adding refrigerant for system extensions.

Performance Curves

TEST RUN OPERATION

Procedure for operating the unit in fixed-frequency mode for testing.

OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT

Charts showing outdoor unit low pressure and current based on ambient conditions.

Actuator Control

Service Functions

LOCKING THE OPERATION MODE OF THE CONDITIONER

Function to lock the outdoor unit operation mode for specific settings.

LOWERING THE OPERATING NOISE OF THE OUTDOOR UNIT

Function to reduce outdoor unit noise, potentially affecting capacity.

PRE-HEAT CONTROL

Function to energize compressor winding to prevent moisture issues.

AUTO LINE CORRECTING

Function to automatically detect and correct improper wiring or piping.

INCREASING MAXIMUM COMPRESSOR OPERATIONAL FREQUENCY AND FAN SPEED

Adjusting compressor frequency and fan speed to improve unit performance.

CHANGING DEFROST FINISH TEMPERATURE AND HEAT OPERATION TIME

Adjusting defrost parameters to optimize performance and reduce runtime.

CHANGING THE AMPERE LIMIT

Function to modify the current flowing to the outdoor unit for protection.

Troubleshooting

CAUTIONS ON TROUBLESHOOTING

Important safety and handling precautions before starting troubleshooting.

FAILURE MODE RECALL FUNCTION

Method to recall and display logged failure modes for diagnosis.

TROUBLESHOOTING CHECK TABLE

Table listing symptoms, LED indications, conditions, and correspondences for troubleshooting.

TROUBLE CRITERION OF MAIN PARTS

Criteria and methods for testing key components like thermistors and motors.

TROUBLESHOOTING FLOW

Flowcharts for diagnosing specific outdoor unit operational issues.

TEST POINT DIAGRAM AND VOLTAGE

Diagrams showing test points and voltage specifications for troubleshooting.

Disassembly Instructions

MXZ-2A Series Disassembly

Step-by-step instructions for disassembling MXZ-2A series outdoor units.

MXZ-3A54VA / MXZ-4A71VA (E1-E4) Disassembly

Disassembly steps for MXZ-3A54VA/4A71VA (E1-E4) outdoor units.

MXZ-3A54VA / MXZ-4A71VA (E5-E7) Disassembly

Disassembly steps for MXZ-3A54VA/4A71VA (E5-E7) outdoor units.

MXZ-4A80VA Disassembly

Disassembly steps for MXZ-4A80VA outdoor unit.

MXZ-4A80VA / MXZ-5A100VA Disassembly

Disassembly steps for MXZ-4A80VA and MXZ-5A100VA outdoor units.

Parts List (non-RoHS compliant)

MXZ-2A40VA / MXZ-2A52VA Structural and Functional Parts

Structural and functional parts for MXZ-2A40VA/2A52VA outdoor units.

MXZ-2A40VA / MXZ-2A52VA Electrical Parts

Electrical parts for MXZ-2A40VA/2A52VA outdoor units.

MXZ-2A40VA / MXZ-2A52VA Drain Socket

Drain socket accessory part for MXZ-2A40VA/2A52VA outdoor units.

MXZ-3A54VA / MXZ-4A71VA Structural and Functional Parts

Structural and functional parts for MXZ-3A54VA/4A71VA outdoor units.

MXZ-3A54VA / MXZ-4A71VA Functional and Electrical Parts

Functional and electrical parts for MXZ-3A54VA/4A71VA outdoor units.

MXZ-4A80VA Structural and Functional Parts

Structural and functional parts for MXZ-4A80VA outdoor units.

MXZ-4A80VA Functional and Electrical Parts

Functional and electrical parts for MXZ-4A80VA outdoor units.

RoHS Parts List (RoHS compliant)

MXZ-2A Series RoHS Structural and Functional Parts

RoHS compliant structural and functional parts for MXZ-2A series.

MXZ-2A Series RoHS Electrical Parts

RoHS compliant electrical parts for MXZ-2A series outdoor units.

MXZ-2A Series RoHS Drain Socket

RoHS compliant drain socket accessory for MXZ-2A series.

MXZ-3A54VA / MXZ-4A71VA RoHS Structural and Functional Parts

RoHS compliant structural and functional parts for MXZ-3A54VA/4A71VA.

MXZ-3A54VA / MXZ-4A71VA RoHS Functional and Electrical Parts

RoHS compliant functional and electrical parts for MXZ-3A54VA/4A71VA.

MXZ-4A80VA / MXZ-5A100VA RoHS Structural and Functional Parts

RoHS compliant structural and functional parts for MXZ-4A80VA/5A100VA.

MXZ-4A80VA / MXZ-5A100VA RoHS Functional and Electrical Parts

RoHS compliant functional and electrical parts for MXZ-4A80VA/5A100VA.

Optional Parts

DIFFERENT-DIAMETER PIPE

Details on optional pipes with different diameters for system extensions.

OUTLET GUIDE

Accessory for changing the air discharge direction of the outdoor unit.