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Mitsubishi Electric MSZ-FS12NA-U1 User Manual

Mitsubishi Electric MSZ-FS12NA-U1
38 pages
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INDOOR UNIT
SERVICE MANUAL
INDOOR UNIT
Models
MSZ-FS06NA
-
U1
MSZ-FS09NA
-
U1
MSZ-FS12NA
-
U1
MSZ-FS15NA
-
U1
MSZ-FS18NA
-
U1
No. OBH872
PARTS CATALOG (OBB872)
Outdoor unit service manual
MUZ-FS∙NA(H) Series (OBH873)
MXZ-C∙NA,NAHZ Series (OBH702)
CONTENTS
1. TECHNICAL CHANGES ······························3
2. PART NAMES AND FUNCTIONS ··················4
3. SPECIFICATION ·········································5
4. OUTLINES AND DIMENSIONS ·····················6
5. WIRING DIAGRAM ·····································7
6. REFRIGERANT SYSTEM DIAGRAM ·············8
7. SERVICE FUNCTIONS ································9
8. MICROPROCESSOR CONTROL ················· 11
9. TROUBLESHOOTING ······························· 20
10. DISASSEMBLY INSTRUCTIONS ·················33
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Mitsubishi Electric MSZ-FS12NA-U1 Specifications

General IconGeneral
BrandMitsubishi Electric
ModelMSZ-FS12NA-U1
CategoryAir Conditioner
LanguageEnglish

Summary

Technical Changes

New Model Information

Details about new model introductions and changes.

Part Names and Functions

Indoor Unit Components

Identification and description of various indoor unit parts and functions.

Accessories Included

List of accessories provided with the indoor unit.

Specification

Operating Range and Conditions

Specifies the operational temperature and humidity ranges for the unit.

Air Speed and Coverage

Details on the airflow speed and coverage area for different modes.

Outlines and Dimensions

Unit Dimensions and Piping

Provides detailed measurements and piping connection specifications for the unit.

Wiring Diagram

Electrical Connections and Symbols

Illustrates the electrical wiring and explains component symbols used.

Refrigerant System Diagram

Refrigerant Flow and Components

Shows the refrigerant circuit, including pipes, thermistors, and flow direction.

Service Functions

Basic Service Functions

Covers Timer Short Mode, Remote Controller Pairing, and Installation Position Setting.

Auto Restart Function

Enables automatic restart of the unit in the same mode after power interruption.

Microprocessor Control

Remote Controller Operation

Details the layout, functions, and indicators of the wireless remote controller.

Indoor Unit Indicators

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

Operation Modes

Covers COOL, DRY, FAN, HEAT, AUTO CHANGE OVER, AUTO VANE, and POWERFUL modes.

Timer and Schedule Settings

Instructions for setting ON/OFF timers, program timers, and weekly schedules.

Advanced Control Features

Explains i-see Control, Absence Detection, Indirect/Direct, Natural Flow, and Smart Set operations.

Special Operation Modes

Details Emergency/Test, Time Delay, and Temperature Indication settings.

Troubleshooting

Troubleshooting Precautions

Safety checks and cautions before diagnosing issues.

Failure Diagnosis Methods

Covers Failure Mode Recall, troubleshooting instructions, check tables, and flowcharts.

Component Checks

Procedures for checking remote controllers, PC boards, fan motors, and wiring.

Disassembly Instructions

Terminal Detaching Procedures

Methods for detaching terminals with and without locking mechanisms.

Removing Unit Panels

Step-by-step guide for removing the front and side panels.

Removing Indoor Electrical Box

Instructions for safely removing the indoor electrical box.

Removing PC Boards and Assemblies

Steps to remove various internal boards and sensor assemblies.

Removing Nozzle Assembly

Procedures for detaching the nozzle assembly.

Removing Vane Motors

Steps for removing the vertical and horizontal vane motors.

Removing Fan Motor and Coil Thermistor

Guide to removing the indoor fan motor, coil thermistor, and fan.

Fixing the Indoor Coil Thermistor

Instructions for mounting the indoor coil thermistor correctly.

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