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Mitsubishi Electric MUH-18NV User Manual

Mitsubishi Electric MUH-18NV
80 pages
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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 ······················ 11
5. WIRING DIAGRAM ··········································15
6. REFRIGERANT SYSTEM DIAGRAM··············24
7. PERFORMANCE CURVES······························29
8. MICROPROCESSOR CONTROL ····················33
9. SERVICE FUNCTIONS ····································44
10. TROUBLESHOOTING······································47
11. DISASSEMBLY INSTRUCTIONS·····················60
12. PARTS LIST······················································70
13. OPTIONAL PARTS ····································BACK
Wireless type
Models
MSH-07NV -
(
WH
)
· MUH-07NV -
MSH-09NV -
(
WH
)
· MUH-09NV -
MSH-12NV -
(
WH
)
· MUH-12NV -
MSH-18NV -
(
WH
)
· MUH-18NV -
MSH-24NV -
(
WH
)
· MUH-24NV -
MSH-07NV -
(
WH
)
· MUH-07NV -
MSH-09NV -
(
WH
)
· MUH-09NV -
MSH-12NV -
(
WH
)
· MUH-12NV -
MSH-18NV -
(
WH
)
· MUH-18NV -
MSH-24NV -
(
WH
)
· MUH-24NV -
MSH-18NV -
(
WH
)
· MUH-18NV -
E3E3
E2E2
E2E2
E2E2
E2E2
E2E2
E1E1
E1E1
E1E1
E1E1
E1E1
No. OB207
MSH-18NV -
MSH-18NV -
MSH-18NV -
E3
E2
E1
This Servise Manual OB207 deals with MSH-07/09/12/18/24NV-E1,
MUH-07/09/12/18/24NV-E1, MSH-18NV-E2, and MUH-18NV-E2 in
OB176 REVISED EDITION-A issued in July in1997.
Therefore, please refer to OB207, not to OB176 REVISED
EDITION-A, for the above models.
Refer to the Service Manual OB185 when MSH-07/09/12NV- , MSH-07/09/12/18NV- , and MSH-18NV-
are connected with MXZ-32NV- as multi system units.
E1
E3E2E1
OB207t-1qxp 25/9/97 8:51 PM Page 1
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Mitsubishi Electric MUH-18NV Specifications

General IconGeneral
BrandMitsubishi Electric
ModelMUH-18NV
CategoryAir Conditioner
LanguageEnglish

Summary

1 TECHNICAL CHANGES

2 PART NAMES AND FUNCTIONS

Indoor Unit Components

Identifies and describes the parts and functions of the indoor unit.

Outdoor Unit Components

Identifies and describes the parts and functions of the outdoor unit.

Remote Controller Components

Identifies and describes the parts and functions of the remote controller.

3 SPECIFICATION

4 OUTLINES AND DIMENSIONS

Indoor Unit Dimensions and Outlines

Shows the physical dimensions and external outline of the indoor units.

Outdoor Unit Dimensions and Outlines

Shows the physical dimensions and external outline of the outdoor units.

5 WIRING DIAGRAM

Indoor Unit Wiring Schematics

Wiring diagrams for the indoor units of various models.

Outdoor Unit Wiring Schematics

Wiring diagrams for the outdoor units of various models.

6 REFRIGERANT SYSTEM DIAGRAM

Indoor Unit Refrigerant Flow

Illustrates the refrigerant circuit and flow within the indoor units.

Outdoor Unit Refrigerant Flow

Illustrates the refrigerant circuit and flow within the outdoor units.

MAX. REFRIGERANT PIPING SPECIFICATIONS

Maximum Height Difference and Piping Length

Details maximum allowable height difference and piping lengths for refrigerant lines.

Additional Refrigerant Charge Guidelines

Provides guidance on calculating additional refrigerant charge based on piping length.

EVACUATION AND REFRIGERANT PROCEDURES

7 PERFORMANCE CHARACTERISTICS

Operating Condition Standards

Specifies voltage, air flow, and key readings for performance testing.

Cooling Performance Data

Graphical data on cooling capacity and total input under varying conditions.

Heating Performance Data

Graphical data on heating capacity and total input under varying conditions.

Cool Operation Performance Curves

Plots outdoor unit current and low pressure against ambient conditions during cooling.

Heat Operation Performance Curves

Plots outdoor unit current against ambient temperature during heating operation.

8 MICROPROCESSOR CONTROL FUNCTIONS

Remote Controller Operation

Details the functions and operation of the wireless remote controller.

"I FEEL CONTROL" Operation Modes

Explains "I FEEL CONTROL" modes, settings, fan speed, and frost prevention.

Operational Modes (Cool, Dry, Heat)

Describes the specific procedures and settings for COOL, DRY, and HEAT modes.

Fan Motor, Vane, and Sleep Mode Control

Details fan motor control, auto vane operation, and sleep mode functions.

Timer Operation Functions

Instructions for setting and cancelling ON/OFF timers.

Emergency and Test Operation Modes

Explains the use of the emergency operation switch for testing and servicing.

9 SERVICE FUNCTIONS AND MODIFICATIONS

Defrost Mode Service Adjustments

Covers compulsory defrosting and changes to defrost termination settings.

Timer and PC Board Service Modifications

Details timer shortening and PC board modifications for individual operation.

Auto Restart Function Setup

Explains the auto restart feature and how to enable it after power failure.

10 TROUBLESHOOTING GUIDE

Cautions, Procedures, and Check Tables

Essential precautions, procedures, and check tables for diagnosing unit issues.

Component-Specific Diagnostic Checks

Detailed diagnostic steps and voltage/resistance checks for key components.

11 DISASSEMBLY AND REASSEMBLY

Indoor Unit Disassembly Procedures

Step-by-step instructions for disassembling indoor unit components.

Outdoor Unit Disassembly Procedures

Step-by-step instructions for disassembling outdoor unit components.

12 PARTS CATALOG

Indoor Unit Parts Listing

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

Outdoor Unit Parts Listing

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

Accessory and Remote Controller Parts

Lists optional accessories and remote controller parts.

13 OPTIONAL PARTS AND ACCESSORIES

Refrigerant Pipe Kits

Details optional refrigerant pipe kits with specifications and compatibility.

Air Filters (Cleaning & Deodorizing)

Information and part numbers for air cleaning and deodorizing filters.

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