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Operation Section
22
(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 (208/230 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:
- 2/10 A, 250 V
CAUTION
Failure to use the exact type of fuse could result in damage to the unit and/or to components. It
could also void the warranty of the unit.
I001772
Dip Switch
<Dip Switch>
Fan Mode Control
Switch
(STOP
⇔
OPERATE)
Temperature Scale
Display Switch
(°C
⇔
°F)
I001773
Fuse
<Relay Board>
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