Page 6 of 16
Drawing : - TPC252
Issue
: - 6
Date
: - 10/12/13
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 automatically 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 60 Hz – 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. If the air temperature is below 20 ºC the unit will go into defrost within
60 minutes. 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.
