Mitsubishi Electric MXZ-24UV-E1 User Manual

SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················3
3. INDOOR/OUTDOOR
CORRESPONDENCE TABLE ···························4
4. INDOOR UNITS COMBINATION ·······················5
5. SPECIFICATION·················································7
6. NOISE CRITERIA CURVES······························ 8
7. OUTLINES AND DIMENSIONS ························ 9
8. WIRING DIAGRAM ··········································10
9. REFRIGERANT SYSTEM DIAGRAM ··············11
10. PERFORMANCE CURVES······························12
11. MICROPROCESSOR CONTROL·····················18
12. TROUBLESHOOTING······································24
13. DISASSEMBLY INSTRUCTIONS·····················36
14. PARTS LIST······················································39
15. OPTIONAL PARTS···········································42
Inverter-controlled multi system
Model
MXZ-24UV -
MXZ-24UV -
E2
E1
No. OB287
REVISED EDITION-A
This manual describes technical data of the outdoor unit.
For the indoor unit refer to the service manuals No. OB229, OB227 REVISED EDITION-B, OB252, OB212,
OB239 and OC165 of corresponding models.
Model indication
SPLIT-TYPE, HEAT PUMP AIR CONDITIONER
Revision:
• MXZ-24UV - has been added.
• Please void OB287.
E2
OB287--1.qxp 03.1.16 10:29 AM Page 1

Mitsubishi Electric MXZ-24UV-E1 Specifications

General

Refrigerant	R410A
Cooling Capacity	24000 BTU/h
Heating Capacity	8.0 kW
Indoor Unit Compatibility	Various Mitsubishi Electric Indoor Units
Indoor Unit Dimensions (W x H x D)	Varies depending on the connected indoor unit model
Outdoor Unit Dimensions (W x H x D)	840 x 710 x 330 mm
Indoor Unit Weight	Varies depending on the connected indoor unit model
Outdoor Unit Weight	52 kg

Summary

Technical Changes

Part Names and Functions

Indoor / Outdoor Correspondence Table

Indoor Units Combination

Specification

Noise Criteria Curves

Outlines and Dimensions

Installation Space Requirements

Details on required clearances for unit installation.

Service Space Requirements

Details on required clearances for servicing the unit.

Wiring Diagram

Refrigerant System Diagram

Refrigerant Piping Specifications

Specifies piping lengths and height differences for system configuration.

Performance Curves

Capacity and Input Curves

Graphs showing capacity and input based on temperatures.

Capacity and Input Correction vs. Inverter Frequency

Outdoor Low Pressure and Unit Current Characteristics

Microprocessor Control

LEV Control Operation

Details on Linear Expansion Valve (LEV) control logic and settings.

Operational Frequency Range

Heat Defrosting Control

High Pressure Protection

High Pressure Protection Control by High Pressure Switch (H.P.S)

Control details for high pressure switch impact on frequency and fan.

Discharge Temperature Protection Control

Refrigerant Recovery Control on Heating

Outdoor Fan Control

Relation between Main Sensor and Actuator

Troubleshooting

Troubleshooting Cautions

Important safety and procedural notes before starting troubleshooting.

Troubleshooting Instruction and Flowcharts

Flowchart and steps for diagnosing outdoor unit issues.

Troubleshooting Check Table

Trouble Criterion of Main Parts

Troubleshooting: Power Supply Check

Troubleshooting: Serial Signal Check

Troubleshooting: R.V. Coil Check

Troubleshooting: LEV Check

Troubleshooting: Inverter and Compressor Check

Troubleshooting: Thermistor Check

Troubleshooting: Fan Motor Check

Troubleshooting: HPS Check

Test Point Diagram and Voltage

Electronic Control P.C. Board

Diagram showing test points and voltages on the electronic control board.

Noise Filter P.C. Board Diagram

I.P.M P.C. Board Diagram

Relay P.C. Board Diagram

Disassembly Instructions

Disassembly: Compressor Removal

Step-by-step instructions for removing the compressor unit.

Disassembly: Fan Motor Removal

Disassembly: 4-Way Valve Removal

Disassembly: Linear Expansion Valve Removal

Disassembly: Reactor Removal

Parts List

Parts List: Outdoor Unit Functional Parts

List of functional parts for the outdoor unit with part numbers.

Parts List: Outdoor Unit Structural Parts

Parts List: Accessory Parts

Optional Parts

Optional Parts: Different-Diameter Pipe

Optional pipes for connecting different diameter refrigerant lines.

Optional Parts: Outlet Guide

Optional accessory for changing air discharge direction.