Mitsubishi Electric MJ-E21BG-S1-IT User manual

2013
DEHUMIDIFIER
SERVICE MANUAL
Model MJ-E21BG-S1-IT
No.MJW-E-1207A
Sold from 2013
CONTENTS
1. Precautions 2
2. Names and Functions of Parts 3
3. Specifications 5
4. Outer Dimensions 5
5. Wiring Diagram 6
6. Function 8
7. Technical Points 9
8. Precautions for failure diagnosis 10
9. Troubleshooting Procedure 11
10. Troubleshooting 18
11. Maintenance 19
12. Service Checklist 21
13. Precautions for Disassembly and Reassembly 22
14. Disassembly and Reassembly Hints 24
15. Parts Catalog 32

1. Precautions Note) This page is extracted from the instruction manual.
2

Note) This page is extracted from the instruction manual. 2. Names and Functions of Parts
3

Note) This page is extracted from the instruction manual.
4

3. Specifications
4. Outer Dimensions
Note) This page is extracted from the instruction manual.
5

5. Wiring Diagram
1) Wiring Diagram
(1) Current fuse....................Overcurrent flow caused by deterioration in electrical parts or other problems
turns the power source to OFF.
<Current setting: 2A>
(2) Motor protector................The compressor stops operating if the room temperature exceeds 35°C.
(Overload relay) The compressor will also shut down when malfunctions or other problems
cause the current flow to exceed 5.3A.
(3) Control circuitry...............The room temperature thermister senses temperature below about 0°C, and
shuts down the compressor.
(4) Thermal fuse...................When blower motor temperature exceeds 133°C due to blower locking or other
malfunctions, blower operation shuts down.
(5) Current fuse for compressor protection
................... If the protection by motor protector and control circuitry is not effective,
the compressor shuts down when the current to it exceeds approximately 10A.
<Setting current: 10A>
Safety Devices
P1 P11
P20
P100
P2 P3P5
P4
FM
S
C
R
CM
P200
P10
P13
SV
P201
P
101
SM
White
White
Orange Orange
Red Red
Thermistor (Tube
temperature sensing)
1℃(defrost)/12℃(end)
Sensors
(Humidity and room
temperature sensing)
Power control board
Blue
Yellow/Green
Brown
Gray
Gray
Gray
Gray
Blue Blue Blue
Black
Gray
White
Red
Yellow
Operation
control board
Float switch
Power plug
Stepping motor
Run capacitor
Compressor
Solenoid valve Blower fan motor
6

2) Board Diagram
[Power control board]
[Operation control board]
7

6. Function
■Function List
Compressor
Blower fan
Solenoid valve
Swing louvre
Power
Lamps
Air Purifier
Full
Drying inside
Humidity (set/current)
Operation mode
Swing area
Swing monitor
Off/on timer
Mildew guard
Defrost
Low temp
Child lock
Power
Selection
Mode
Humidity Selection
Air purfier
Swing louvre
Off/on timer
Drying inside
Child lock
LCD indicator LED indicator
Button
Child lock Operation off Auto Mildew guard Low Temp Intelligent Laundry
Easy dehumidifying
Full Air purifier
Drying inside
Defrost Off timer on On timer being set On timer counting
Low
Operation mode
Dehumidifying operation
High
Note : Display lamp/Operable
: Timer - flashes when on
: Off/stopped/inoperable
: Operable only when swing on/lit
: Operable only when swing on and blower fan rotates
: LCD/LED lights at each operation mode
: LCD/LED flashes at each operation mode
: Lights at room temperatures of 14℃or under
: Varies by conditions.
: ON LED lit or flashing
: OFF LED lit
ON
OFF
Intelligent
HIGH
8

7. Technical Points
Dehumidifying
Defrosting
Coolant flow
Blow
Fan
Heat exchanger (heat radiation)
φ5
φ6.35
φ5
φ6.35
Compressor
Heat exchanger (cooling)
Intake
φ6.35
Tube temperature
sensing thermistor
φ6.35
Capillary tube
Capillary tube
φ2.0×φ0.8×φ340
φ5.0×φ4.0
φ6.35
Humidity
sensor
Room
temperature
sensing thermistor
Solenoid
valve
(closed when
dehumidifying
and open
when
defrosting)
Note) This page is extracted from the instruction manual.
■Coolant Circuit
■Performance curve
9

Electric shock
No wet hands
Don’t touch
Check Returntoasitwas
Keep awayWear gloves
WARNING
CAUTION
WARNING
CAUTION
Mishandling may result in minor or damage to your home or property ,etc.
Mishandling may result in fatal or serious injury, or fire.
Remove the power plug
from the socket.
Forbidden Always follow the
instructions Alert
Meanings of graphic symbols are explained below.
Failure to do so may cause electric shock or injuries.
Do not touch a rotating object
until it completely stops.
The rotating object may catch your hand etc,
and result in injuries.
Check the wiring diagram
before wiring processing.
Failure to do so may cause combustion,
generation of smoke, and/or malfunction.
When performing work with
the power on, be careful
not to touch the live part.
This may cause electric shock.
Do not work with wet hands.
This may cause electric shock.
After the work,
laythewireout asitwasbefore.
Failure to do so may cause combustion,
generation of smoke, and/or malfunction.
Wear protective gloves.
Failure to do so may result in injuries
by the edge of metal, electric shock,
and/or burns caused by contact with hot section.
Keep children away.
Failure to do so may result in
electric shock and/or injuries when moving
the unit or using a measuring device.
The following precautions should be observed in order to perform troubleshooting safely and correctly.
The following diagrams indicate circumstances where danger can result from mishandling the unit.
Unplug
8. Precautions for failure diagnosis
10