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Mitsubishi Electric TRANE NTXUKS09A112AA User Manual

Mitsubishi Electric TRANE NTXUKS09A112AA
40 pages
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Models
NTXUKS09A112AA
NTXUKS12A112AA
NTXUKS18A112AA
No. OBHT802
INDOOR UNIT
NTXUKS09A112AA
NTXUKS12A112AA
NTXUKS18A112AA
SERVICE MANUAL
Outdoor unit service manual
NTXMMX•A•AA, NTXMPH•A•AA
Series (OBHT702, OCHT573)
PARTS CATALOG (OBBT802)
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
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Mitsubishi Electric TRANE NTXUKS09A112AA Specifications

General IconGeneral
BrandMitsubishi Electric
ModelTRANE NTXUKS09A112AA
CategoryAir Conditioner
LanguageEnglish

Summary

Indoor Unit Service Manual

Technical Changes

Part Names and Functions

Specifications

Operating Range

Covers power supply voltage and operational temperature/humidity limits.

Outlet Air Speed and Coverage

Details airflow rates and air coverage for different models and modes.

Outlines and Dimensions

Wiring Diagram

Refrigerant System Diagram

Service Functions

Timer Short Mode

Shortens timer settings for service purposes, reducing wait times.

Set Remote Controller for Particular Unit

Assigns a specific remote controller to an indoor unit for multi-system control.

Auto Restart Function

Unit automatically resumes operation after power interruption.

PC Board Modification for Airflow Volume

Adjusts fan speed based on ceiling height via dip switch.

PC Board Modification for Airflow Direction

Modifies airflow direction angle via slide switch.

Microprocessor Control

Wireless Remote Controller

Details the functions, buttons, and display of the wireless remote.

Indoor Unit Display Section

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

Cool Operation

Step-by-step guide for operating the unit in cooling mode.

Dry Operation

Step-by-step guide for operating the unit in dry mode.

Fan Operation

Details operation using only the fan mode.

Heat Operation

Step-by-step guide for operating the unit in heating mode.

Auto Change Over

Automatic switching between cooling and heating modes based on temperature.

Auto Vane Operation

Control of the horizontal vane for airflow direction.

Drain Pump/Float Sensor Control

Management of the drain pump and float sensor operation.

Timer Operation

Setting and using ON/OFF and program timers.

Weekly Timer Operation

Setting daily and weekly operational schedules.

Smart Set Operation

Customizing specific settings for cooling or heating modes.

Sleep Operation

Activates a mode for gradual temperature adjustment during sleep.

Emergency/Test Operation

Special modes for servicing or emergency situations.

3-Minute Time Delay Operation

Protects the compressor from overload by delaying restart.

Changing Temperature Indication

Allows switching between Fahrenheit and Celsius displays.

Troubleshooting

Cautions on Troubleshooting

Important safety and preparatory steps before performing troubleshooting.

Failure Mode Recall Function

How to recall and interpret stored error codes from the unit.

Instruction of Troubleshooting

A general flowchart guiding the troubleshooting process.

Trouble Judgement Criteria of Main Parts

Methods to check resistance and operation of key components.

Troubleshooting Flow

Step-by-step process for diagnosing indoor fan motor issues.

Check Remote Controller, Receiver P.C. Board, Indoor Electronic Control P.C. Board

Diagnosing issues related to remote communication and control boards.

Check Indoor Electronic Control P.C. Board and Indoor Fan Motor

Detailed checks for the main control board and fan motor faults.

Check Miswiring and Serial Signal Error

Identifying and correcting wiring errors and communication signal issues.

Check of Float Sensor

Diagnosing problems related to the float sensor and drain system.

Electromagnetic Noise Interference

Addressing issues where electromagnetic noise affects TV or radio reception.

Test Point Diagram and Voltage

Provides diagrams of test points and expected voltages for diagnostics.

Disassembly Instructions

Removing the Intake Grille

Step-by-step procedure for removing the front intake grille.

Removing the Grille

Steps to detach and remove the main external grille assembly.

Removing Indoor Control Boards and Lamp Cover

Procedure to access and remove electronic control boards and lamp cover.

Removing Heat Exchanger and Stabilizer

Instructions for safely removing the heat exchanger and stabilizer components.

Removing Horizontal and Vertical Vane Motors

Steps to detach and remove the motors controlling the air vanes.

Removing Drain Pump and Float Sensor

Procedure for removing the drain pump assembly and float sensor.

Removing Fan Motor and Line Flow Fan

Steps to remove the indoor fan motor and associated fan components.

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