MWDUC Service Manual
North America Air Conditioner
MWDUC
Service Manual
Dimensions
W (mm, inch)
H (mm, inch)
D (mm, inch)
MWDUC08AR
471
18.5
340
13.4
400
15.7
MWDUC10AR/MWDUC12AR
482
19.0
372
14.6
545
21.5
1.
Operation
Modes
and
❺ Timer Button
Press
Instructions
to start or stop the Auto On or Auto Off
function. Press or hold either
1.1 Display control
Up or
Down the
setting time from 0.0 to 24 hours.
❶ On-Off Button
❷
❺
❽
❻
Press
to turn on or
off the unit.
NOTE: The unit will
initiate automatically the
Energy Saver function
under cool, Dry, Auto
(only Auto-Cooling and
Auto-Fan) modes.
❷ Up and Down Button
❸
❼
❹
❶
Press or hold either
Up
or
Down
the
setting temp 1 ℃ / 2 ℉
each times from 62 ℉
(17 ℃ ) to 88 ℉ (30 ℃ ).
Also can be used for time
adjust in Timer function.
Some models press and hold both Up and Down
buttons for 3 seconds, will change the display from ℉
to ℃.
❸ Mode select Button
Press
to change the operation mode, each time
you press the button, a mode is selected in a sequence
that goes from Auto, Cool, Dry and Fan.
The unit will initiate automatically the Energy Saver
function under Cool, Dry, Auto (only Auto-Cooling and
Auto Fan) modes.
Base on Energy Stars’ requirement.
❻ Sleep Button
Press
to start or stop the sleep function.
❼ Energy Saver Button
Press
to start or stop the energy saver function.
This function is available on Cool, Dry, Auto (only AutoCooling and Auto-Fan) modes.
When the room temp is meet the compressor shut off
condition, the fan motor will continue running for 3
minutes, after that, the fan motor will running for 2
minutes every 10 minutes, until the compressor start.
❽ Check Filter Button
This function is a reminder to clean the Air Filter for
more efficient and more healthy. The LED light will
keep illuminate after 250 hours of operation, until Press
.
Mechanical:
②
②
①
①
❹ Fan speed Button
Press
to change the fan speed, each time you
press the button, the fan speed in four steps, Auto, Low,
Med and High.
On Dry mode, the fan speed is controlled at Low
automatically.
① On-Off and Mode select switch
Use this switch to turn on or off the unit, and select the
operation mode for Low Cooling, High Cooling, Low
Fan, High Fan.
② Temperature switch
Use this switch to setting the temperature for Cooling
mode.
● On-Off switch
Use this switch to turn on or off the
unit, the unit will only running at
cooling mode..
Note: To protect the compressor,
every time when the customer turn
on the unit, we suggest to wait for
three minutes.
1.2 Remote control
signal from remote for 7 minutes, the unit will turn off
this function.
⓬ Cancel Button
Press this button to stop the time on or off function. If
only set timer off, and the unit has been turn off, press
cancel button, the unit will turn on.
⓭ Clock Button
Press to set the time.
⓮ LED Button
Press to off or light the digit LED display, only can be
used when the unit is on.
⓯ Reset Button
Reset the remote control to the initial settings.
⓰ Lock Button
Lock the remote control, and do not accept any
operation until press the Lock button again.
2 Electronic function
2.1 Terms and definitions
 TA: Temperature of indoor ambient (T1)
 TE: Temperature of evaporator (T2).
 TS: The set temperature.
 DAHT: Sensor of heater
Button ❶ to ❽ is the same with the display control.
❾ One Touch Button
Press this button, the unit will running into the Cooling
mode, auto fan speed, and the setting temperature is
80℉/26℃.
And the timer function will be cancelled.
❿ Clean Air Button (Optional)
Press this button to turn on the ionizer.
⓫ Fellow Me Button (Optional)
Press this button to turn on this function, the remote
has a temperature sensor, to instead of the room
temperature sensor, every 3 minutes the remote will
send a temperature to AC, if the unit do not get any
2.2 Protection function
 The compressor restart protection functions with a
delay of 3 minutes.
 Sensor protection at open or short circuit.
2.3 Fan-only mode
 The temperature can’t be controlled at the mode,
and the room ambient temperature is display on
LED. The temp only display 32 to 99 ℉(0 to 37℃),
lf out of range will display LO or HI
 The Ion/ Timer functions are valid at the fan-only
mode.
2.4 Cooling mode
 The temp can be set from 62 to 86℉(17 to 30℃)
 The compressor will be activated by sensing the
difference between setting temperature and the
actual ambient room temperature.
 The compressor operates as below:
Operation conditon
(TA-Ts)℉
compressor on
Press sleep button again, or use the remote
control to set anything.
Turn off the unit.
It is time to turn off the unit, for timer off function.
+2
Example:
0
compressor off with a delay of 1 minute
When TA≤TS, compressor off
When T1>TS+2℉, compressor on



The Ion/ Timer/ Sleep/ Energy Saver/ Follow Me
functions are valid at the cooling mode.
Auto-defrosting function protection as below:
When TE is lower, it means that the evaporator
frosts. Then the unit starts defrosting, and the
indoor fan keeps working at the moment. When
the temperature is up, the unit stops defrosting.
TE ℉
compressor on
3 Improvement to meet the 2013
Energy Star’s requirement
Requirement
Old
If the compressor
stop, the fan motor
running time should
less than 5 minutes,
after that, the fan
motor running time
should less than 17%
When
compressor
turn off, the fan motor
will keep running 3
minutes then stop,
after that, every 10
minutes the fan motor
will start 2 minutes
until the compressor
start.
Do not change.
Frist start should be
energy saver mode.
Auto mode, 70F, auto
fan
Cooling energy saver
mode, 70F, auto fan.
If it is running at Cool,
Auto,
Dry
mode
before turn off, when
you turn on the unit, it
should running into
the energy saver
mode.
The
same
before.
For Fan or Heating
mode, it will the same
with before.
For others, If the
condition can meet
the
compressor’s
running requirement
for Cooling or Dry, the
unit will turn on the
Energy Saver mode.
If not, the fan motor
will keep running 3
minutes then stop,
after that, every 10
minutes the fan motor
will start 2 minutes
until the compressor
start.
Should has the filter
cleaning notice.
Filter Check light
55
30
New
compressor off
when TE is lower than 30℉
lasting for 5 seconds
2.5 Dry mode
 The temp can be setting the same as Cooling
mode.
 The fan speed is low and can’t be controlled at the
mode.
2.6 Sleep mode
 This function is 7 hours. And only can be used in
Cool, Dry and Heat mode.
 In this function the fan speed will be change to
auto fan.
 In this function, the first and second 30minuts, the
setting temp will up (or down for heating mode) 2
℉ (1℃), after that will keep 6 hours, until the
function stop.
 When the function is start, if you do any operation
below, the function will stop.
with
4 Internal Structures
Filter Check light
5 Installation and use notice
5.1 The inside should be higher than outside, to make
sure that the water from evaporator will be easy to flow
to the outside. and the water will be helpful to get more
capacity and more EER.
NOTE: Check that air conditioner is tilted back about
H(tiled about 3°to 4°downward to the outside). After
proper installation, condensate should not drain from
the overflow drain hole during normal use, correct the
slope otherwise.
5.2 Cleaning filter
Structure Damage.
Problem
Solution
Wall plug disconnected. Push plug firmly into wall
outlet.
House fuse blown or circuit breaker tripped.
Replace fuse with time delay type or reset circuit
Air conditioner
breaker.
does not start
Plug Current Device Tripped. Press the RESET
button.
Control is OFF. Turn Control ON and set to desired
setting.
Room temperature below 17 ℃(62℉). Cooling may
not occur until room temperature rises above
17 ℃(62℉).
Temperature sensing element touching cold coil,
Air from unit
located behind air filter. Straighten tube away from
does not feel
coil.
cold enough
Reset to a Lower temperature.
Compressor shut-off by changing modes. Wait
approximately 3 minutes and listen for compressor
to restart when set in the COOL mode.
Outdoor temperature below 17 ℃(62℉). To
Air conditioner
defrost the coil, set FAN ONLY mode.
cooling, but room
Air filter may be dirty. Clean filter. Refer to Care and
is too warm- ice
Cleaning section. To defrost, set to FAN ONLY
forming on
mode.
cooling coil
Thermostat set too cold for night-time cooling. To
behind
defrost the coil, set to FAN ONLY mode. Then, set
decorative front.
temperature to a Higher setting.
Dirty air filter- air restricted. Clean air filter. Refer to
Notice:
 Never use hot water over 104℉(40℃) to clean the
air filter. Never attempt to operate the unit without
the air filter.
 Every time, when filter check LED light, we
suggest to cleaning the filter, it will be better for
healthy, and save energy.
 When the AC has not used for a long time, like one
month or more, we suggest to cleaning the filter
before re-use.
Care and Cleaning section.
Temperature is set too High, set temperature to a
Lower setting.
Air conditioner
Air directional louvers positioned improperly.
cooling, but room
Position louvers for better air distribution.
is too warm- NO
Front of units is blocked by drapes, blinds, furniture,
ice forming on
etc. - restricts air distribution. Clear blockage in front
cooling coil
of unit.
behind
Doors/ windows/registers, etc. Open- cold air
decorative front.
escapes. Close doors, windows, registers.
Unit recently turned on in hot room. Allow additional
6 Troubleshooting
In general, possible trouble is classified in three kinds.
One is called Starting Failure which is caused from an
electrical defect, another is ineffective Air Conditioning
caused by a defect in the refrigeration circuit and
improper application, and the other is called the
time to remove. Stored heat from walls, ceiling, floor
and furniture.
Dirty air filter- air restricted. Clean air filter
Air conditioner
Outside temperature extremely hot. Set FAN speed
turns on and off
to a Higher setting to bring air past cooling coils
rapidly
more frequently.
Air movement sound. This is normal. If too loud, set
4
39.2
28.3459
45
113
4.2126
Noise when unit
to a slower FAN setting.
5
41
26.8778
46
114.8
4.0459
is cooling
Window vibration - poor installation. Refer to
6
42.8
25.4954
47
116.6
3.8867
installation instructions or check with installer.
7
44.6
24.1932
48
118.4
3.7348
Water dripping
Improper installation. Tilt air conditioner slightly to
8
46.4
22.5662
49
120.2
3.5896
INSIDE when
the outside to allow water drainage. Refer to
9
48.2
21.8094
50
122
3.4510
unit is cooling.
installation instructions - check with installer.
10
50
20.7184
51
123.8
3.3185
Water dripping
Unit removing large quantity of moisture from humid
11
51.8
19.6891
52
125.6
3.1918
OUTSIDE when
room. This is normal during excessively humid
12
53.6
18.7177
53
127.4
3.0707
unit is cooling.
days.
13
55.4
17.8005
54
129.2
2.959
Remote control not located within range. Place
14
57.2
16.9341
55
131
2.8442
remote control within 20 feet & 180° , radius of the
15
59
16.1156
56
132.8
2.7382
16
60.8
15.3418
57
134.6
2.6368
17
62.6
14.6181
58
136.4
2.5397
18
64.4
13.918
59
138.2
2.4468
19
66.2
13.2631
60
140
2.3577
20
68
12.6431
61
141.8
2.2725
21
69.8
12.0561
62
143.6
2.1907
22
71.6
11.5000
63
145.4
2.1124
23
73.4
10.9731
64
147.2
2.0373
24
75.2
10.4736
65
149
1.9653
25
77
10.000
66
150.8
1.8963
26
78.8
9.5507
67
152.6
1.8300
27
80.6
9.1245
68
154.4
1.7665
28
82.4
8.7198
69
156.2
1.7055
29
84.2
8.3357
70
158
1.6469
30
86
7.9708
Remote Sensing
Deactivating
front of the unit.
Prematurely
Remote control signal obstructed. Remove
(some models)
obstruction.
Room too cold
Set temperature too low. Increase set temperature.
6.2 Sensor malfunction
LED
Stand for
display
AS
Room temperature sensor error
Sensor protection at open circuit sensor
LO
error
Sensor protection at short circuit sensor
HI
error
HS
Electric heating sensor error
Evaporator temperature sensor at open or
ES
short circuit
Characteristic of temperature sensor
Temp.℃
Temp.℉
Resistance KΩ
Temp.℃
Temp.℉
Resistance KΩ
-10
14
62.2756
31
87.8
7.6241
-9
15.8
58.7079
32
89.6
7.2946
-8
17.6
56.3694
33
91.4
6.9814
-7
19.4
52.2438
34
93.2
6.6835
-6
21.2
49.3161
35
95
6.4002
-5
23
46.5725
36
96.8
6.1306
-4
24.8
44.0000
37
98.6
5.8736
-3
26.6
41.5878
38
100.4
5.6296
-2
28.4
39.8239
39
102.2
5.3969
-1
30.2
37.1988
40
104
5.1752
0
32
35.2024
41
105.8
4.9639
1
33.8
33.3269
42
107.6
4.7625
2
35.6
31.5635
43
109.4
4.5705
3
37.4
29.9058
44
111.2
4.3874
7 Exploded view
1
Front panel assembly
15
Rear separating
1.1
Front panel
16
Left linker of fan motor
1.2
Air outlet frame
17
Right linker of fan motor
1.4
Panel frame
18
Centrifugal fan
1.5
Vertical vane I
19
Volute shell (below)
1.6
Louver holder
20
Mid volute shell
1.7
Vertical vane II
21
Volute shell (above)
2
Evaporator assembly
23
Electronic control box assembly
3
Compressor
23.2
Capacitor of compressor
4
Condenser assembly
23.3
Capacitor clip
5
Installation accessory
23.5
Power cord
7
Cabinet assembly
23.6
Electronic control box
8
Top shutter frame
23.7
Cover of electronic control box
9
Chassis assembly
23.8
Thermostat
11
Suction pipe
23.9
Main switch
12
Discharge pipe assembly
25
Air filter
13
Axial flow fan
27
Knob switch
14
Asynchronous motor
28
Spring for knob
Classic Industries, Inc.
7101 NW 43rd Street
Miami, FL 33166
[email protected]
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