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Mitsubishi Electric MUH-18RV User Manual

Mitsubishi Electric MUH-18RV
88 pages
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SERVICE MANUAL
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················2
3. SPECIFICATION·················································6
4. NOISE CRITERIA CURVES·······························8
5. OUTLINES AND DIMENSIONS ······················ 10
6. WIRING DIAGRAM ··········································13
7. REFRIGERANT SYSTEM DIAGRAM··············17
8. PERFORMANCE CURVES······························20
9. MICROPROCESSOR CONTROL ····················36
10. SERVICE FUNCTIONS·····································50
11. TROUBLESHOOTING······································52
12. DISASSEMBLY INSTRUCTIONS·····················71
13. PARTS LIST······················································79
14. OPTIONAL PARTS···········································88
Wireless type
Models
MSH-18RV -
(
WH
)
· MUH-18RV -
MSH-24RV -
(
WH
)
· MUH-24RV -
MSH-30RV -
(
WH
)
· MUH-30RV -
E1E1
E1E1
E1E1
No. OB272
MSH-18RV -
MSH-24RV -
E1
E1
•Refer to the Service Manual OB185 REVISED
EDITION C when MSH-18RV- is connected
with MXZ-32NV- or MXZ-32NV- as multi
system units.
•Refer to the Service Manual OB227 REVISED
EDITION-B when MSH-18RV- is connected
with MXZ-32RV- as multi system units.
•Refer to the Service Manual OB254 when MSH-
18RV- is connected with MXZ-32SV- as
multi system units.
E1E1
E1
E1
E2E1
E1
OB272-1.qxp 2/7/01 2:53 PM Page 1

Table of Contents

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Mitsubishi Electric MUH-18RV Specifications

General IconGeneral
BrandMitsubishi Electric
ModelMUH-18RV
CategoryAir Conditioner
LanguageEnglish

Summary

Introduction and Specifications

Technical Changes

Details modifications and updates to the models covered in the manual.

Part Names and Functions

Identifies and describes components of indoor and outdoor units.

Accessories

Lists accessories provided with the indoor and outdoor units for installation.

Model Specifications

Detailed technical specifications for indoor and outdoor units including capacity, electrical data, and dimensions.

Noise Criteria Curves

Sound pressure levels across frequencies for different unit models during operation.

Outlines and Dimensions

Dimensional drawings and installation space requirements for indoor and outdoor units.

Refrigerant System Diagrams

Visual representation of refrigerant flow and components for different models.

Additional Refrigerant Charge

Guidelines for additional refrigerant charging based on piping length.

Performance Curves

Graphs illustrating unit performance (cooling/heating) under various conditions.

Electrical Wiring and Control Systems

Wiring Diagrams

Electrical schematics for indoor and outdoor unit connections and components.

Microprocessor Control System

Explanation of the unit's internal control logic, modes, and features.

"I FEEL CONTROL" Operation Modes

Detailed explanation of COOL, DRY, and HEAT modes within the "I FEEL CONTROL" function.

Defrosting Control

Conditions and logic for initiating and releasing the defrost cycle.

Timer Operation

Instructions for programming and managing ON/OFF timers for unit operation.

Emergency-Test Operation

Procedures for using emergency operation and test runs for servicing.

LEV Control

Control logic for the Liquid Expansion Valve based on discharge temperature.

Service, Troubleshooting, and Disassembly

Service Functions

Special functions for maintenance and adjustment, like compulsory defrost and auto restart.

Troubleshooting Procedures

Guidance for diagnosing and resolving unit malfunctions using flowcharts and error codes.

Trouble Diagnosis for Main Components

Criteria for identifying faulty main components through resistance and voltage checks.

Test Point Diagram and Voltage

Voltage readings and test points on electronic control boards for diagnostics.

Outdoor Deicer P.C. Board Checks

Procedures for checking the outdoor deicer P.C. board and related components.

Indoor Unit Disassembly Instructions

Step-by-step instructions for safely disassembling the indoor unit.

Outdoor Unit Disassembly Instructions

Step-by-step instructions for safely disassembling the outdoor unit.

Parts Lists and Optional Parts

Indoor Unit Parts List

List of structural, functional, and electrical parts for indoor units.

Outdoor Unit Parts List

List of structural, electrical, and functional parts for outdoor units.

Optional Parts

Information and maintenance for optional accessories like air and deodorizing filters.

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