Mitsubishi Electric MU-24NV - E1 - 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

Model-Specific Technical Updates

Details changes to P.C. boards, auto restart function, and refrigerant capacity across various models.

Part Names and Functions

Indoor Unit Components Identification

Identifies and describes components of the indoor unit.

Outdoor Unit Components Identification

Identifies and describes components of the outdoor unit.

Specification

Outlines and Dimensions

Indoor Unit Physical Dimensions

Provides physical dimensions and mounting details for indoor units.

Outdoor Unit Physical Dimensions

Provides physical dimensions and installation clearances for outdoor units.

Wiring Diagram

MS;MU-07;09 NV Series Wiring Diagrams

Wiring diagrams for indoor and outdoor units of MS/MU-07/09NV series.

Refrigerant System Diagram

MS;MU-07;09 NV Refrigerant Flow

Refrigerant system layout for MS-07/09NV and MU-07/09NV models.

MS;MU-12 NV Refrigerant Flow

Refrigerant system layout for MS-12NV and MU-12NV models.

Refrigerant Piping and Charge Specifications

Maximum Refrigerant Piping Lengths

Specifies maximum lengths for refrigerant piping and connecting pipes.

Additional Refrigerant Charge Guidelines

Details additional refrigerant charges based on piping length.

Evacuation Procedures (Air Purge)

Performance Curves

Voltage, Air Flow, and Main Readings

Details voltage requirements, air flow settings, and key performance parameters.

Indoor Air Wet-Bulb Temperature Measurement Method

Step-by-step guide to measure indoor air wet-bulb temperature difference.

Microprocessor Control

Wireless Remote Controller Functionality

Explains the functionality and operation of the wireless remote controller.

I FEEL CONTROL Mode Operation

Details the 'I FEEL CONTROL' mode and its automatic operation.

COOL Mode I FEEL CONTROL Details

DRY Mode I FEEL CONTROL Details

COOL Operation Procedure

DRY Operation Procedure

FAN Operation Mode

Fan Motor Control and Auto Vane Operation

Sleep Mode Operation

Timer Operation

Setting and Cancelling Timer Operations

Step-by-step guide on setting and cancelling timer operations.

Program Timer Combination Usage

Explains how to use ON and OFF timers in combination.

Service Functions

Timer Short Mode for Service

Describes shortening timer intervals for service purposes.

Remote Controller P.C. Board Modification

Details modifying the P.C. board for individual unit operation.

Auto Restart Function

Troubleshooting

Troubleshooting Cautions and Precautions

Safety and preliminary checks before performing troubleshooting.

Troubleshooting Procedure and Servicing Care

Outlines the general procedure and precautions for diagnosing issues.

Troubleshooting Flowchart and Symptom Table

Trouble Criteria for Main Parts

Indoor Fan Motor and Receiver P.C. Board Checks

Indoor Control P.C. Board and Outdoor Unit Checks

Test Point Diagram and Voltage

Disassembly Instructions

Indoor Unit Disassembly (MS-07;09;12 NV)

Instructions for disassembling the indoor unit of MS-07/09/12NV models.

Indoor Unit Panel and Board Removal

Steps to remove the front panel and electronic boards from the indoor unit.

Indoor Unit Electrical Box and Fan Motor Removal

Indoor Unit Disassembly (MS-18;24 NV)

Indoor Unit Panel and Board Removal

Steps to remove the front panel and electronic boards from the indoor unit.

Indoor Unit Electrical Box and Fan Motor Removal

Outdoor Unit Disassembly (MS-07;09 NV)

Outdoor Unit Cabinet and Fan;Motor Removal

Steps to remove the cabinet, fan, and motor from the outdoor unit.

Outdoor Unit Compressor Removal

Outdoor Unit Disassembly (MS-12;18;24 NV)

Outdoor Unit Cabinet and Electrical Parts Removal

Steps to remove the cabinet and electrical components from the outdoor unit.

Outdoor Unit Fan Motor and Compressor Removal

Parts List

Indoor Unit Structural Parts List

Lists structural parts for the indoor unit.

Indoor Unit Heat Exchanger Parts List

Lists heat exchanger parts for the indoor unit.

Indoor Unit Electrical Parts List

Outdoor Unit Structural Parts List

Outdoor Unit Functional & Electrical Parts List

Optional Parts

Optional Refrigerant Pipes

Details optional refrigerant pipes and their specifications.

Air Cleaning Filter Information

Deodorizing Filter Information

Mitsubishi Electric MU-24NV - E1 Specifications