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Mitsubishi Electric MLZ-KY06NA - U1 User Manual

Mitsubishi Electric MLZ-KY06NA - U1
40 pages
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No. OBH922
INDOOR UNIT
SERVICE MANUAL
PARTS CATALOG (OBB922)
CONTENTS
1. TECHNICAL CHANGES ··································· 2
2. PART NAMES AND FUNCTIONS ····················· 3
3. SPECIFICATION ················································ 4
4. OUTLINES AND DIMENSIONS ························ 6
5. WIRING DIAGRAM ············································ 7
6. REFRIGERANT SYSTEM DIAGRAM ··············· 8
7. SERVICE FUNCTIONS ····································· 9
8. MICROPROCESSOR CONTROL ··················· 12
9. TROUBLESHOOTING ····································· 21
10. DISASSEMBLY INSTRUCTIONS ···················· 35
Models
MLZ-KY06NA
-
U1
Outdoor unit service manual
MXZ-CNA, MXZ-CNAHZ Series
(OBH702)
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Mitsubishi Electric MLZ-KY06NA - U1 Specifications

General IconGeneral
BrandMitsubishi Electric
ModelMLZ-KY06NA - U1
CategoryAir Conditioner
LanguageEnglish

Summary

TECHNICAL CHANGES

1. New model

Details about the new model introduction and any technical changes.

PART NAMES AND FUNCTIONS

ACCESSORIES

Lists and identifies the accessories provided with the indoor unit.

SPECIFICATION

1. Multi connection

Provides specifications for multi-connection configurations of the indoor unit.

3-1. OPERATING RANGE

Details the operating voltage, temperature, and humidity ranges for the unit.

3-2. OUTLET AIR SPEED AND COVERAGE

Specifies airflow volume, speed, and coverage for different operating modes.

OUTLINES AND DIMENSIONS

INDOOR UNIT OUTLINE DRAWING

Provides detailed drawings and dimensions for the indoor unit's physical layout.

REMOTE CONTROLLER OUTLINE DRAWING

Shows the external dimensions and layout of the remote controller.

GRILLE OUTLINE DRAWING

Details the outline and dimensions of the indoor unit's grille.

INDOOR UNIT DETAIL VIEW

Offers a closer look at specific installation points and features of the indoor unit.

WIRING DIAGRAM

INDOOR UNIT

Illustrates the electrical connections and component layout for the indoor unit.

REFRIGERANT SYSTEM DIAGRAM

INDOOR UNIT

Depicts the refrigerant flow and key components within the indoor unit.

SERVICE FUNCTIONS

7-1. TIMER SHORT MODE

Explains how to shorten timer settings for service purposes.

7-2. REMOTE CONTROLLER EXCLUSIVE SETTING

Details how to set a remote controller exclusively for a specific indoor unit.

7-3. AUTO RESTART FUNCTION

Describes the function that automatically restarts the unit after power loss.

7-4. AIRFLOW VOLUME PC BOARD MODIFICATION

Guides on modifying the PC board to change airflow volume based on ceiling height.

7-5. AIRFLOW DIRECTION PC BOARD MODIFICATION

Guides on modifying the PC board for adjusting airflow direction preference.

MICROPROCESSOR CONTROL

WIRELESS REMOTE CONTROLLER

Explains the operation and features of the wireless remote controller.

INDOOR UNIT DISPLAY SECTION

Describes the meaning of the operation indicator lamps on the indoor unit.

8-1. COOL OPERATION

Details the steps and features of the cooling mode operation.

8-2. DRY OPERATION

Explains the operation of the dry mode, including frost prevention.

8-3. FAN OPERATION

Describes the operation of the fan-only mode.

8-4. HEAT OPERATION

Details the operation of the heating mode, including cold air prevention.

8-5. AUTO CHANGE OVER OPERATION

Explains how the unit automatically switches between cooling and heating.

8-6. AUTO VANE OPERATION

Details the automatic horizontal and vertical vane operations for optimal airflow.

8-7. DRAIN PUMP CONTROL

Explains the operating conditions and control of the drain pump.

8-8. TIMER OPERATION

Guides on setting ON/OFF timers and program timers for unit operation.

8-9. WEEKLY TIMER OPERATION

Provides instructions for setting up weekly timer schedules for operation.

8-10. SMART SET OPERATION

Explains how to set and use the SMART SET operation mode.

8-11. SLEEP OPERATION

Details how to activate and use the SLEEP operation mode for comfort.

8-12. EMERGENCY/TEST OPERATION

Describes how to perform emergency or test operations for servicing.

8-13. 3-MINUTE TIME DELAY OPERATION

Explains the compressor protection function against frequent restarts.

8-14. Changing temperature indication (°F/°C)

Guides on switching the temperature display between Fahrenheit and Celsius.

TROUBLESHOOTING

9-1. CAUTIONS ON TROUBLESHOOTING

Important safety precautions and checks before starting troubleshooting.

9-2. FAILURE MODE RECALL FUNCTION

Explains how to recall and interpret stored failure modes for diagnostics.

9-3. INSTRUCTION OF TROUBLESHOOTING

Provides a general flowchart and instructions for troubleshooting issues.

9-4. TROUBLESHOOTING CHECK TABLE

A table correlating operation indicator lamp patterns with symptoms, conditions, and remedies.

9-5. TROUBLESHOOTING CRITERION OF MAIN PARTS

Details resistance criteria for checking key internal components like thermistors and motors.

9-6. TROUBLESHOOTING FLOW

Provides a detailed flowchart for diagnosing specific faults, like indoor fan motor issues.

B Remote Controller and Receiver Troubleshooting

Guides on checking the remote controller, receiver, and PC board for malfunctions.

C Indoor Electronic Control PC Board and Fan Motor Checks

Steps to check the indoor electronic control PC board and indoor fan motor for faults.

D Miswiring and Serial Signal Error Check

Procedure to identify and resolve miswiring or serial signal communication errors.

E Drain Sensor and Drain Pump Check

Detailed steps to diagnose issues related to the drain sensor and drain pump.

F Electromagnetic Noise Interference

Troubleshooting steps for electromagnetic noise affecting TV or radio reception.

9-7. TEST POINT DIAGRAM AND VOLTAGE

Provides diagrams of test points and voltage references on the PC board for diagnostics.

DISASSEMBLY INSTRUCTIONS

1. Removing the intake grille

Step-by-step guide to safely remove the indoor unit's intake grille.

2. Removing the grille

Instructions for removing the main grille assembly and side panels.

3. Removing Control Boards and Display

Steps to remove the main electronic control, receiver, and display PC boards.

4. Removing Heat Exchanger and Stabilizer

Guide for removing the heat exchanger and stabilizer assembly.

5. Removing Vane Motors

Instructions for removing the horizontal and vertical vane motors.

6. Removing Drain Pump and Sensor

Steps to remove the drain pump and drain sensor components.

7. Removing Fan Motor and Line Flow Fan

Guide for removing the indoor fan motor and line flow fan assembly.

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