Mitsubishi MUY-A15NA User Manual

SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················5
3. SPECIFICATION·················································6
4. OUTLINES AND DIMENSIONS ·······················10
5. WIRING DIAGRAM···········································11
6. REFRIGERANT SYSTEM DIAGRAM··············15
7. DATA·································································17
8. ACTUATOR CONTROL····································30
9. SERVICE FUNCTIONS ····································31
10. TROUBLESHOOTING······································31
11. DISASSEMBLY INSTRUCTIONS·····················59
12. PARTS LIST······················································66
12-1. PARTS LIST·············································66
12-2. RoHS PARTS LIST··································72
13. OPTIONAL PARTS ·························BACK PAGE
Wireless type
Models
MUZ-A09NA MUZ-A09NA-
MUZ-A12NA MUZ-A12NA-
MUZ-A15NA MUZ-A15NA-
MUZ-A17NA MUZ-A17NA-
MUZ-A24NA MUZ-A24NA-
MUY-A15NA
MUY-A17NA
MUY-A24NA
U1
U1
U1
U1
U1
No. OB451
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
OUTDOOR UNIT
Indoor unit service manual
MSZ-A•NA Series (OB450)
MUZ-A09NA MUY-A15NA
MUZ-A12NA MUY-A17NA
MUZ-A15NA
NOTE:
This service manual describes technical data of the outdoor units.
RoHS compliant products have <G> mark on the spec name plate.
For servicing of RoHS compliant products, refer to the PARTS
LIST (RoHS compliant).
TM
HFC
utilized
R410A
OB451--1.qxp 06.3.29 9:51 AM Page 1

Mitsubishi MUY-A15NA Specifications

General

Brand	Mitsubishi
Model	MUY-A15NA
Category	Air Conditioner
Language	English

Summary

Technical Changes and R410A Refrigerant Information

Information for R410A Refrigerant

Details and precautions for using R410A refrigerant, including a specification comparison.

Tools Dedicated for R410A Refrigerant

Lists and describes tools required for R410A refrigerant systems.

Refrigerant Piping and Procedures

Covers refrigerant piping, oil, air purging, and charging procedures.

Part Names and Functions

Outdoor Unit Component Identification

Identifies and labels main parts of the outdoor unit for different model series.

Unit Specifications

MSZ/MSY-A09/12NA Specifications

Detailed technical specifications for MSZ/MSY-A09/12NA models.

MSZ/MSY-A15/17NA Specifications

Detailed technical specifications for MSZ/MSY-A15/17NA models.

MSZ/MSY-A24NA Specifications

Detailed technical specifications for MSZ/MSY-A24NA models.

Performance Test Conditions

Details the test conditions used for SEER and HSPF ratings.

Outlines and Dimensions

Dimensions for MUZ-A09/12/15/17NA & MUY-A15/17NA

Provides dimensional drawings and required space for smaller outdoor units.

Dimensions for MUZ-A24NA & MUY-A24NA

Provides dimensional drawings and required space for larger outdoor units.

Wiring Diagrams

Wiring Diagram for MUZ-A09/12/15/17NA

Electrical wiring schematic for MUZ-A09/12/15/17NA outdoor units.

Wiring Diagram for MUY-A15/17NA

Electrical wiring schematic for MUY-A15/17NA outdoor units.

Wiring Diagram for MUZ-A24NA

Electrical wiring schematic for MUZ-A24NA outdoor unit.

Wiring Diagram for MUY-A24NA

Electrical wiring schematic for MUY-A24NA outdoor unit.

Refrigerant System Diagrams

Refrigerant System for MUZ-A09/12/15/17NA & MUY-A15/17NA

Diagram showing refrigerant flow and components for specific MUZ/MUY models.

Refrigerant System for MUZ-A24NA & MUY-A24NA

Diagram showing refrigerant flow and components for MUZ/MUY-A24NA models.

Max Refrigerant Piping Lengths and Height Differences

Details maximum piping lengths and height differences for all models.

Performance Data and Curves

Cooling Capacity Performance Tables

Tables showing cooling capacity at various indoor/outdoor conditions.

Heating Capacity Performance Tables

Tables showing heating capacity at various indoor/outdoor conditions.

Performance Curves (Cooling & Heating)

Graphical representation of capacity and input correction by inverter frequency.

Condensing Pressure Charts (Cooling & Heating)

Charts illustrating condensing and suction pressures under various conditions.

Actuator Control Logic

Outdoor Fan Motor Control Sequence

Describes the fan motor's operation interlocking with the compressor.

Reversing Valve (R.V.) Coil Control Logic

Explains the control sequence for the 4-way reversing valve based on operation mode.

Sensor to Actuator Mapping

Maps sensor inputs to actuator outputs for different unit models.

Service Functions

Defrost Setting Adjustment Procedure

Details how to modify the defrost finish temperature via jumper wire.

Troubleshooting and Fault Diagnosis

General Troubleshooting Precautions

Essential safety measures and preparation steps before troubleshooting.

Failure Mode Recall and LED Diagnosis

Step-by-step guide to recall fault codes and interpret LED indicators.

Component Troubleshooting and Flowcharts

Component checks, resistance tests, and diagnostic flowcharts for system issues.

Disassembly Instructions

Terminal Detaching Points

Instructions on how to detach terminals with locking mechanisms.

Cabinet and Outer Panel Removal

Steps for removing the service panel, top panel, cabinet, and back panel.

Removing Internal Assemblies and Boards

Procedures for removing inverter, power, and control P.C. boards and related assemblies.

Component Removal Procedures

Steps for removing specific parts like R.V. coil, thermistors, fan motor, compressor, and 4-way valve.

Parts List

Outdoor Unit Structural and Functional Parts

Illustrated parts list for structural and functional components (non-RoHS and RoHS).

Outdoor Unit Electrical Parts

Illustrated parts list for electrical and electronic components (non-RoHS and RoHS).

Optional Parts

Drain Socket and Assembly Parts

Lists parts numbers for drain sockets and their assemblies.