Mitsubishi Electric MXZ-18NV User Manual

SERVICE MANUAL
SPLIT-TYPE,HEAT PUMP AIR CONDITIONERS
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················2
3. INDOOR /OUTDOOR
CORRESPONDENCE TABLE··········3
4. INDOOR UNITS COMBINATION ·······················4
5. SPECIFICATION·················································9
6. OUTLINES AND DIMENSIONS························11
7. WIRING DIAGRAM ··········································13
8. REFRIGERANT SYSTEM DIAGRAM··············15
9. PERFORMANCE CURVES······························20
10. MICROPROCESSOR CONTROL ····················30
11. TROUBLESHOOTING······································39
12. DISASSEMBLY INSTRUCTIONS·····················53
13. PARTS LIST······················································57
14. OPTIONAL PARTS ····································BACK
Inverter-controlled multi system
Models
MXZ-18NV -
MXZ-32NV -
MXZ-18NV -
MXZ-32NV -
E2
E2
E1
E1
No. OB185
REVISED EDITION C
This manual describes technical data of outdoor unit.
For indoor unit refer to the service manuals No.OB207 and OB196 REVISED EDITION A of corresponding
models.
Model indication
Revision:
●MXZ-18NV- and MXZ-18NV- have been added.
●Page layout has been changed.
●Performance curves has been modified.
●The graph of the outdoor low pressure in the HEAT
operation of the PERFORMANCE CURVE of MXZ-
32NV was deleted.
●Please void OB185 REVISED EDITION A and B.
E2E1
MXZ-32NV

Mitsubishi Electric MXZ-18NV Specifications

General

Brand	Mitsubishi Electric
Model	MXZ-18NV
Category	Air Conditioner
Language	English

Summary

SERVICE MANUAL

TECHNICAL CHANGES

SPECIFICATION

WIRING DIAGRAM

REFRIGERANT SYSTEM DIAGRAM

MAX REFRIGERANT PIPING LENGTH

Specifies the maximum allowable lengths and bending points for refrigerant piping.

PIPE SIZE SELECTION

Guides the selection of appropriate refrigerant pipe diameters based on unit capacity.

EVACUATION PROCEDURES

Provides step-by-step instructions for evacuating the refrigerant system.

PERFORMANCE CURVES

MICROPROCESSOR CONTROL

System organization

TROUBLESHOOTING

Cautions on troubleshooting

Important safety and handling precautions before performing troubleshooting.

Troubleshooting procedure

Flowchart and table for identifying and addressing system abnormalities based on error codes.

Checking the mis-wiring and serial signal error (Only MXZ-32NV)

Troubleshooting the components (Simple check method for main components)

Provides simple resistance and voltage checks for key components.

DISASSEMBLY PROCEDURE

OUTDOOR UNIT

PARTS LIST

OUTDOOR UNIT STRUCTURAL PARTS

OUTDOOR UNIT FUNCTIONAL PARTS

OUTDOOR UNIT ELECTRICAL PARTS