Mitsubishi Electric MS-24NV - E2 (WH) - User Manual

SERVICE MANUAL
SPLIT-TYPE,HEAT PUMP AIR CONDITIONERS
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················3
3. SPECIFICATION·················································6
4. OUTLINES AND DIMENSIONS ·························9
5. WIRING DIAGRAM ··········································12
6. REFRIGERANT SYSTEM DIAGRAM··············20
7. PERFORMANCE CURVES······························24
8. MICROPROCESSOR CONTROL ····················27
9. SERVICE FUNCTIONS ····································34
10. TROUBLESHOOTING······································37
11. DISASSEMBLY INSTRUCTIONS·····················45
12. PARTS LIST······················································53
13. OPTIONAL PARTS···········································61
Wireless type
Models
MS-07NV -
(
WH
)
· MU-07NV -
MS-09NV -
(
WH
)
· MU-09NV -
MS-12NV -
(
WH
)
· MU-12NV -
MS-18NV -
(
WH
)
· MU-18NV -
MS-24NV -
(
WH
)
· MU-24NV -
MS-07NV -
(
WH
)
· MU-07NV -
MS-09NV -
(
WH
)
· MU-09NV -
MS-12NV -
(
WH
)
· MU-12NV -
MS-18NV -
(
WH
)
· MU-18NV -
MS-24NV -
(
WH
)
· MU-24NV -
MS-18NV -
(
WH
)
· MU-18NV -
E3E3
E2E2
E2E2
E2E2
E2E2
E2E2
E1E1
E1E1
E1E1
E1E1
E1E1
No. OB206
MS-18NV -
MS-24NV -
MS-18NV -
MS-24NV -
MS-18NV -
E3
E2
E2
E1
E1
This Servise Manual OB206 deals with MS-07/09/12/18/24NV-E1,
MU-07/09/12/18/24NV-E1, MS-18NV-E2, and MU-18NV-E2 in
OB175 THIRD EDITION issued in June in 1997.
Therfore, please refer to OB206, not to OB175 THIRD EDITION,
for the above models.
OB206t-1.qxp 25/9/97 6:42 PM Page 1

Summary

Technical Changes

Part Names and Functions

Indoor Unit Components

Lists and describes parts of the indoor air conditioning unit.

Outdoor Unit Components

Lists and describes parts of the outdoor air conditioning unit.

Technical Specifications

Outlines and Dimensions

Indoor Unit Dimensions and Layout

Displays external dimensions and mounting details for the indoor unit.

Outdoor Unit Dimensions and Layout

Displays external dimensions and installation clearance for the outdoor unit.

Wiring Diagrams

Indoor Unit Wiring Schematic

Shows the electrical wiring layout for the indoor unit components.

Outdoor Unit Wiring Schematic

Shows the electrical wiring layout for the outdoor unit components.

Refrigerant System Diagrams

Refrigerant Flow for MS-07;09 NV Models

Illustrates the refrigerant path for MS-07/09NV series units.

Refrigerant Flow for MS-12 NV Models

Illustrates the refrigerant path for MS-12NV series units.

Refrigerant Flow for MS-18 NV Models

Illustrates the refrigerant path for MS-18NV series units.

Refrigerant Flow for MS-24 NV Models

Illustrates the refrigerant path for MS-24NV series units.

Performance Curves

Guaranteed Voltage and Air Flow Settings

Specifies operating voltage limits and required airflow settings.

Main Readings and Measurement Procedure

Details key readings and how to measure performance parameters.

Microprocessor Control

Remote Controller Operation

Describes how to use the remote controller and its functions.

I FEEL CONTROL Mode

Details the "I FEEL CONTROL" mode and its temperature determination.

Temperature and Fuzzy Control Logic

Explains temperature settings and fuzzy logic in specific modes.

Operation Modes: COOL, DRY, FAN

Describes the functionality of COOL, DRY, and FAN operation modes.

Fan Motor Control and Auto Vane Operation

Covers fan motor speed control and automatic vane operation.

Sleep Mode Operation

Explains the sleep mode and vane positioning procedures.

Timer Operation

Details how to set and cancel timer operations for the unit.

Service Functions

Timer Short Mode

Describes a function to shorten timer setting intervals for service.

Remote Controller Modification

Explains how to modify the remote controller PC board for multi-unit use.

Auto Restart Function

Details the auto restart feature and its setup.

Troubleshooting Guide

Troubleshooting Cautions and Precautions

Important safety and handling precautions before troubleshooting.

Troubleshooting Procedure and Check Tables

Steps, flowcharts, and tables for identifying and resolving malfunctions.

Main Parts Trouble Diagnosis Criteria

Criteria for checking the condition of key components like thermistors and motors.

Specific Component Checks and Test Points

Detailed checks, including test point diagrams and voltage readings, for components.

Disassembly Instructions

Indoor Unit Disassembly Procedures

Instructions for taking apart the indoor unit components.

Outdoor Unit Disassembly Procedures

Instructions for taking apart the outdoor unit components.

Parts List

Indoor Unit Parts

Lists structural, heat exchanger, and electrical parts for indoor units.

Outdoor Unit Parts

Lists structural, functional, and electrical parts for outdoor units.

Model-Specific Unit Parts

Lists parts specific to MU-12NV and MS-18/24NV models.

Optional Parts

Optional Refrigerant Pipes

Details optional refrigerant pipe kits and their specifications.

Air Cleaning and Deodorizing Filters

Describes maintenance and replacement of air filters.

Mitsubishi Electric MS-24NV - E2 (WH) Specifications