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975672 • Version 3.3 • 28.10.2010
Hygrostat and other control options, continued
Defrosting
If the CDP 75/125/165 are used in the temperature range between 15 and 20°C the
evaporator coil should be protected by a sensor.
When the defrosting sensor registers a temperature below 5°C, the control interprets
this as ice building up on the evaporator coil and lets the unit run for another 30 min-
utes. Then the compressor stops and the fan leads the room air over the evaporator
coil until the defrosting sensor registers that the temperature has reached 5°C.
This defrosting process is called passive, demands-related defrosting, as it only takes
place when needed.
The defrosting sensor is supplied on demand as an extra accessory. A mounting in-
struction follows the defrosting sensor.
Connection of
defrosting sensor
Please follow this procedure to connect a defrosting sensor:
Step Action
1 The defrosting sensor is fixed in points 15 and 16 on the PCB terminal
2 DIP Switches 3 and 6 are set on ON
3 The sensor is placed in the sensor pocket of the evaporator coil
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