Mitsubishi Electric MR. SLIM SLZ Series User Manual

Mitsubishi Electric MR. SLIM SLZ Series

40 pages

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TECHNICAL & SERVICE MANUAL

CONTENTS

1. REFERENCE MANUAL

......................

2

2. SAFETY PRECATION .........................3

3. PARTS NAMES AND FUNCTIONS

.....

9

4. SPECIFICATIONS

.............................

14

5. NOISE CRITERION CURVES

...........

14

6. OUTLINES AND DIMENSIONS

.........

16

7. WIRING DIAGRAM

............................

18

8.

REFRIGERANT SYSTEM DIAGRAM

.....

19

9. TROUBLESHOOTING

.......................

20

10. 4-WAY AIR FLOW SYSTEM

..............

33

11. DISASSEMBLY PROCEDURE

..........

35

No. OCH522

Indoor unit

[Model Name] [Service Ref.]

SLZ-M15FA.TH

SLZ-M15FA.TH-ER

SLZ-M25FA.TH

SLZ-M25FA.TH-ER

SLZ-M35FA.TH

SLZ-M35FA.TH-ER

SLZ-M50FA.TH

SLZ-M50FA.TH-ER

SLZ-M60FA.TH

SLZ-M60FA.TH-ER

INDOOR UNIT

Model name

indication

SLZ-M15FA

SLZ-M25FA

SLZ-M35FA

SLZ-M50FA

SLZ-M60FA

February 2018

Note:

• This manual describes service

data of the indoor units only.

PARTS CATALOG (OCB522)

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

R32/R410A

Table of Contents

Questions and Answers:

A
Amanda AguirreAug 7, 2025
What to do if Mitsubishi Electric MR. SLIM SLZ Air Conditioner trouble is not reoccurring and is logged?
- S
  Sarah VazquezAug 7, 2025
  If the trouble with your Mitsubishi Electric Air Conditioner is not reoccurring and is logged, consider temporary defects such as the activation of protection devices in the refrigerant circuit (including the compressor), poor wiring connections, or noise. Re-check the symptoms, installation environment, refrigerant amount, weather conditions when the issue occurred, and wiring. After servicing, reset the check code logs and restart the unit. This indicates that there is no abnormality in electrical components, the controller board, or the remote controller.
A
Austin GonzalezAug 14, 2025
What to do if Mitsubishi Electric Air Conditioner trouble is reoccurring and the check code is displayed?
- K
  Kelsey ClarkeAug 14, 2025
  If the trouble with your Mitsubishi Electric Air Conditioner is reoccurring and a check code is displayed, determine the cause and take corrective action according to “9-3. SELF-DIAGNOSIS ACTION TABLE”.
R
Robert CarterAug 21, 2025
What to do if Mitsubishi Electric Air Conditioner trouble is reoccurring and the check code is not displayed?
- C
  Cory MasseyAug 21, 2025
  If the trouble with your Mitsubishi Electric Air Conditioner is reoccurring and the check code is not displayed, conduct troubleshooting to ascertain the cause of the problem according to “9-4. TROUBLESHOOTING OF PROBLEMS”.
A
Amanda PerezAug 29, 2025
What to do if Mitsubishi Electric MR. SLIM SLZ trouble is not reoccurring and is not logged?
- J
  Jacqueline EstradaAug 29, 2025
  If the trouble with your Mitsubishi Electric Air Conditioner is not reoccurring and is not logged: * Re-check the abnormal symptom. * Conduct troubleshooting and ascertain the cause of the trouble according to “9-4. TROUBLESHOOTING OF PROBLEMS”. * Continue to operate unit for the time being if the cause is not ascertained. This indicates that there is no abnormality concerning parts such as electrical components, the controller board, or the remote controller.

Mitsubishi Electric MR. SLIM SLZ Series Specifications

General

Brand	Mitsubishi Electric
Model	MR. SLIM SLZ Series
Category	Air Conditioner
Language	English

Summary

REFERENCE MANUAL

SAFETY PRECAUTION

ALWAYS OBSERVE FOR SAFETY

General safety guidelines and precautions for working with the unit.

CAUTIONS RELATED TO NEW REFRIGERANT

Specific safety warnings and procedures for refrigerants like R32/R410A.

PARTS NAMES AND FUNCTIONS

INDOOR UNIT PARTS

Identifies and describes the main components of the indoor unit.

WIRELESS REMOTE CONTROLLER

Explains the functions and display of the wireless remote controller.

WIRED REMOTE CONTROLLER

Details the functions, display, and interface of the wired remote controller.

SPECIFICATIONS

ELECTRICAL AND RATING CONDITIONS

Lists specifications and rating conditions for key electric components.

NOISE CRITERION CURVES

OUTLINES AND DIMENSIONS

WIRING DIAGRAM

REFRIGERANT SYSTEM DIAGRAM

TROUBLESHOOTING

TROUBLESHOOTING SUMMARY

Overview of self-diagnosis check codes and service actions.

MALFUNCTION DIAGNOSIS BY REMOTE CONTROLLER

Method for diagnosing malfunctions using the remote controller.

SELF-DIAGNOSIS ACTION TABLE

Detailed table of self-diagnosis check codes and countermeasures.

TROUBLESHOOTING OF PROBLEMS

Lists symptoms, causes, and countermeasures for operational problems.

TEST POINT DIAGRAM

Illustrates test points on the indoor controller board for troubleshooting.

DIP SWITCH AND JUMPER WIRE FUNCTIONS

Explains DIP switch and jumper wire settings for unit functions.

MAIN PARTS TROUBLE CRITERIA

Criteria for checking main parts like thermistors, motors, and sensors.

4-WAY AIR FLOW SYSTEM

FRESH AIR INTAKE INSTALLATION

Details installation location and procedure for fresh air intake.

FRESH AIR INTAKE CHARACTERISTICS

Graph showing fresh air intake amount vs. static pressure.

DUCT FAN (BOOSTER FAN) OPERATION

Wiring and operation for integrating a duct fan (booster fan).

FIXING HORIZONTAL VANE POSITION

Procedure for setting and fixing the horizontal vane angle.

DISASSEMBLY PROCEDURE

Removing Air Intake Grille and Filter

Steps to remove the air intake grille and the air filter.

Removing the Panel and Corner Panels

Procedure for removing the main panel and corner panels.

Removing Electrical Parts

Steps to remove electrical components from the control box.

Removing Room Temperature Thermistor (TH1)

How to safely remove the room temperature thermistor.

Removing the Drain Pan

Procedure for removing the drain pan and associated parts.

Removing Temperature Thermistors (TH2, TH5)

Steps to remove pipe and condenser/evaporator temperature thermistors.

Removing Fan Motor (MF)

Procedure for removing the fan motor and turbo fan assembly.

Removing Drain Pump and Float Switch

Steps to remove the drain pump and float switch.

Removing the Heat Exchanger

Procedure for removing the heat exchanger.

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