MovinCool Office Pro W20 Service Manual - Manual (Page 30)

Operation Section
30
(2) Relay board
• The relay board receives signals and outputs
from the control board that contains a
microprocessor. The relay board contains the
compressor, fan on, and fan mode (speed)
relays.
• It also contains a step-down transformer that
converts the line voltage (115 VAC) to 12 V.
• This 12 V is then converted from AC to DC and
used for relay coil activation. The 12 V (DC)
power is sent to the control panel assembly where it is further reduced to 5 V for the system logic.
• The relay board also contains the DIP switch.
• The DIP switch is used to change the fan mode operation from stop to operate and change both
the set point and room temperature display from Fahrenheit to Celsius.
< NOTE >
The relay board must be serviced as a complete assembly. It has only one serviceable
component, the fuse. (see below)
(3) Relay board fuse
• This fuse provides protection against damage
to the step-down transformer. It must be
replaced with the exact type of fuse or an
equivalent.
Specifications:
- 0.25 A, 250 V
CAUTION
Failure to use the exact type of fuse could result in personal injury, damage to the unit and/or to
the components which may void the warranty.
I002196
Dip Switch
Fan Mode Control
Switch
(STOP⇔OPERATE)
Temperature Scale
Display Switch
(°C⇔°F)
<Dip Switch>
I002197
Fuse
<Relay Board>