Product And Functional Description - Dantherm CDF 40 Servicehandbuch

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Product and functional description

Product and functional
description
Functionality of the
dehumidifier
Fan control
Compressor control
Defrosting
Safety circuit
12
Illustration of the functional principle of the CDF 40-50-70
CDF
CDF 40-50-70 work in accordance with the condensation principle.
Humid air from the pool room is drawn into the unit by one or two fans.
When passing through the evaporator the air is cooled down to below dew point and water
vapour is condensed into water, which is drained.
The dry air is then passed through the condenser where it is heated and returned to the pool
room. As a result of the latent heat from the condensation process and the compressor energy
the return air temperature to the pool room is approx. 5ºC higher than the air from the pool
room.
When the dehumidifier is started by the hygrostat, the fan(s) are activated at the same time as
the compressor.
The number of compressor starts is limited by a 6 minutes timer, which starts when the
compressor is switched on.
The timer must have come to an end before the compressor can be switched on again.
Each time the unit has been switched off on the main switch, by the built-in hygrostat or by
an external hygrostat, it will take 30 seconds before the unit can be switched on again.
This is a safety feature protecting the compressor against overloading caused by too high
pressure in the cooling circuit at start up.
This unit is equipped with an intelligent defrosting strategy.
The unit monitors the temperature of the evaporator, and when the temperature has been
below a certain temperature for a period of time, the dehumidifier will switch to active
defrosting, the fans will stop, and the magnetic valve will open.
The hot gas can now pass through the evaporator.
When the evaporator has the right temperature again the magnet valve will close and the
dehumidification will continue.
If the condenser temperature in the dehumidifier increases to a temperature of more than 55
°C (in case of fan failure.) or room air temperature is higher than 32 °C, the compressor stops
automatically to avoid damage.
When the temperature allows for it the dehumidification will continue.