CD425 OWNERS MANUAL
Drawing No. :- TPC252
Issue :-
1
Date :-
13/10/03
OPERATION
The CD425 is a self contained low temperature dehumidifier. All electrical contactors,
overloads, etc are housed in an electrical box built inside the unit. The unit is equipped with a
defrost valve which energized every 42 minutes to clear any ice formation on the evaporator
coils. This allows the unit to operate at much lower temperatures, the control panel gives
indication of the set humidity, drying and defrost status.
TEST FOR CORRECT OPERATION
The following procedure should be followed to test the unit for correct operation.
1.
After unpacking connect the unit to a 220V 3PH 60hz – 3 wire power supply.
2.
Switch fan ON and check for correct fan rotation. (Air blows out of the top of the
machine).
3.
Check dehumidification process:
a)
Remove the front cover
b)
Check the actual relative humidity inside the area
c)
Set humidity control to a LOWER value than the actual relative humidity
d)
After approximately 6 minutes check the compressor is running
e)
Leave the machine to run for 15 minutes. (NOTE: ensure that the set humidity,
see c above, is set very low as the compressor will switch off when the actual RH
coincides with the set point)
f)
Observe the evaporator coils
i.
If the air temperature is below 20ºC an even coating of ice should cover
the entire evaporator coil
ii.
If the temperature is above 20ºC droplets of condensed water should cover
the entire evaporator coil
4.
Leave the unit to run for a further 27 minutes after which the unit should go through a 4
minute defrost cycle.
During the defrost cycle the defrost solenoid valve is energized and a warming of the
evaporator coil can be felt.
If after carrying out the above checks the unit does not appear to function correctly refer
to the repairs section or your supplier.
