Mitsubishi Electric MSZ-EF18VGW-E1

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INDOOR UNIT

No. OBH831

REVISED EDITION-D

Models

MSZ-EF18VGW/B/S

MSZ-EF18VGKW/B/S

MSZ-EF22VGW/B/S

ET1

ET2

ET3

MSZ-EF22VGKW/B/S

ET1

ER1

ET2

ER2

MSZ-EF25VGW/B/S

ET1

ET2

ET3

MSZ-EF25VGKW/B/S

ET1

ER1

ET2

ER2

MSZ-EF35VGW/B/S

ET1

ET2

ET3

MSZ-EF35VGKW/B/S

ET1

ER1

ET2

ER2

MSZ-EF42VGW/B/S

ET1

ET2

ET3

MSZ-EF42VGKW/B/S

ET1

ER1

ET2

ER2

MSZ-EF50VGW/B/S

ET1

ET2

ET3

MSZ-EF50VGKW/B/S

ET1

ER1

ET2

ER2

MSZ-EF∙VGW/VGKW

MSZ-EF∙VGB/VGKB

MSZ-EF∙VGS/VGKS

PARTS CATALOG (OBB831)

CONTENTS

1. TECHNICAL CHANGES ······························3

2. PART NAMES AND FUNCTIONS ··················4

3. SPECIFICATION ········································5

4. NOISE CRITERIA CURVES ··························7

5. OUTLINES AND DIMENSIONS ·····················9

6. WIRING DIAGRAM ··································· 10

7. REFRIGERANT SYSTEM DIAGRAM ··········· 18

8. SERVICE FUNCTIONS ······························19

9. MICROPROCESSOR CONTROL ················22

10. TROUBLESHOOTING ······························· 30

11. DISASSEMBLY INSTRUCTIONS ················· 49

SERVICE MANUAL

Outdoor unit service manual

MUZ-EF∙VG/H Series (OBH832)

MXZ-F∙VF Series(OBH790)

OBH831 REVISED EDITION-B is void.

Revision D:

• MSZ-EF22/25/35/42/50VGW/B/S -

ET3

MSZ-EF18/22/25/35/42/50VGKW/B/S -

and

MSZ-EF22/25/35/42/50VGKW/B/S -

ET2

ER2

have been added.

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This document is a service manual for Mitsubishi Electric Indoor Unit Split-Type Air Conditioners, specifically for models in the MSZ-EF-VGKW/B/S series and MXZ-EF-V VF series. It provides comprehensive information for maintenance, troubleshooting, and disassembly.

Function Description

The Mitsubishi Electric MSZ-EF-VGKW/B/S series are split-type air conditioners designed for indoor use. They provide cooling and heating functionalities to maintain desired room temperatures. The units are equipped with various features to enhance comfort and energy efficiency, including different fan speeds (Super High, High, Med., Low, Silent), and operational modes such as COOL, DRY, and HEAT. Some models also include a Wi-Fi interface for remote control and monitoring.

Important Technical Specifications

The manual details specifications for various models, including MSZ-EF18VGW/B/S, MSZ-EF22VGW/B/S, MSZ-EF25VGW/B/S, MSZ-EF35VGW/B/S, MSZ-EF42VGW/B/S, and MSZ-EF50VGW/B/S.

Power Supply: Single phase 230 V, 50 Hz for all listed models.
Power Input (W):
- MSZ-EF18VGW/B/S: Cooling 26, Heating 20
- MSZ-EF25VGW/B/S: Cooling 26, Heating 20
- MSZ-EF35VGW/B/S: Cooling 30, Heating 24
- MSZ-EF42VGW/B/S: Cooling 33, Heating 23
- MSZ-EF50VGW/B/S: Cooling 43, Heating 39
Running Current (A):
- MSZ-EF18VGW/B/S: Cooling 0.26, Heating 0.20
- MSZ-EF25VGW/B/S: Cooling 0.26, Heating 0.20
- MSZ-EF35VGW/B/S: Cooling 0.29, Heating 0.24
- MSZ-EF42VGW/B/S: Cooling 0.31, Heating 0.23
- MSZ-EF50VGW/B/S: Cooling 0.39, Heating 0.39
Dimensions (W × H × D): 885 × 299 × 195 mm for all models.
Weight: 11.5 kg for MSZ-EF18/25VGW/B/S, 11.5 kg for MSZ-EF35VGW/B/S, 11.5 kg for MSZ-EF42VGW/B/S, and 11.5 kg for MSZ-EF50VGW/B/S.
Airflow (m³/h): Varies by model and fan speed (Super High, High, Med., Low, Silent). For example, MSZ-EF18VGW/B/S in cooling mode has airflow values ranging from 630 (Super High) to 240 (Silent). MSZ-EF50VGW/B/S in cooling mode ranges from 876 (Super High) to 408 (Silent).
Sound Level (dB(A)): Varies by model and fan speed. For MSZ-EF18VGW/B/S in cooling, it ranges from 29 (Super High) to 19 (Silent). For MSZ-EF50VGW/B/S in cooling, it ranges from 49 (Super High) to 30 (Silent).
Fan Speed (rpm): Varies by model and fan speed. For MSZ-EF18VGW/B/S in cooling, it ranges from 1,330 (Super High) to 570 (Silent). For MSZ-EF50VGW/B/S in cooling, it ranges from 1,570 (Super High) to 810 (Silent).
Rated Conditions (based on ISO 5151):
- Cooling: Indoor Dry-bulb temperature 27°C, Wet-bulb temperature 19°C. Outdoor Dry-bulb temperature 35°C.
- Heating: Indoor Dry-bulb temperature 20°C. Outdoor Dry-bulb temperature 7°C, Wet-bulb temperature 6°C.
Main Electric Parts: Fuse (T3.15AL250V), Horizontal vane motor (12 V DC), Varistor (NR11), Terminal block (TB).
Refrigerant System: Uses refrigerant pipe φ9.52 (with heat insulator) for the main indoor coil thermistor (RT12) and φ6.35 for the sub indoor coil thermistor (RT13).

Usage Features

Remote Control: The units are operated via a wireless remote controller. The manual provides detailed instructions on how to use the remote controller for various functions, including setting temperature, fan speed, operation mode (COOL, DRY, HEAT), and timer functions.
Operation Display: The indoor unit has an operation indicator lamp that shows the operation state (Lit for operation, Blinking for standby, Not lit for standby mode during multi-system operation).
Timer Operation: Users can set ON/OFF timers for daily or weekly schedules. The remote controller allows setting specific times for the unit to turn on or off, with options for individual days or weekly programming.
I-save Operation: This feature allows users to save preferred temperature and fan speed settings for quick recall.
Auto Restart Function: In case of a power outage, the unit will automatically restart with the previous settings once power is restored. This function can be enabled or disabled by cutting a jumper wire (JR77) on the indoor electronic control P.C. board.
Wi-Fi Interface: Some models are equipped with a Wi-Fi interface, enabling remote control and monitoring via a smartphone or other smart devices. The manual includes instructions for setting up the Wi-Fi interface and troubleshooting common connection issues.
Horizontal Vane Operation: The horizontal vane motor allows users to adjust the airflow direction. The vane can be set to various positions or to swing automatically.
ECONO COOL Operation: This energy-saving mode adjusts the temperature and fan speed to provide comfortable cooling while reducing power consumption.

Maintenance Features

Troubleshooting: The manual provides extensive troubleshooting guides for various issues, including power supply problems, abnormal fan operation, and communication errors. It includes flowcharts and tables to help identify the cause of a problem based on symptoms and indicator lamp blinks.
- Failure Mode Recall Function: This function helps diagnose issues by displaying error codes through blinking patterns of the operation indicator lamp. The manual provides a detailed table linking specific blinking patterns to conditions and suggested remedies.
- Test Point Diagram and Voltage: Detailed diagrams of the indoor P.C. board, receiver P.C. board, and display P.C. board are provided, along with test points and expected voltage values for diagnostic purposes.
Disassembly Instructions: Step-by-step instructions with accompanying photos are provided for disassembling the indoor unit for maintenance or part replacement. This includes:
- Removing the panel and horizontal vanes.
- Removing the indoor electrical box and the indoor electronic control P.C. board.
- Removing the nozzle assembly and horizontal vane motor.
- Removing the indoor fan motor, indoor coil thermistor, and line flow fan.
- Specific instructions for models with a Wi-Fi interface are also included.
Cleaning: The manual emphasizes the importance of regular cleaning of the air filter and air cleaning filter to maintain optimal performance and air quality.
Safety Precautions: Important safety warnings are highlighted throughout the manual, such as turning off the power supply before disassembly, avoiding contact with water, and ensuring proper handling of electrical components. It also warns against using non-specified refrigerant and improper wiring.