Defrosting; Safety Circuit; Maintenance; Cleaning Of The Filter, Drip Tray And Drain - Dantherm CDF 35 Service Manual

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3. Ambient temperature below 3 C – the dehumidifier is switched off.
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The dehumidifier starts again automatically when the ambient temperature increases to more than 3 C.
4. Defrosting mode – the evaporator is being defrosted
The LEDs 4 and 5 light up during defrosting of the evaporator. In defrosting mode the compressor is
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working and the fan is stopped. When the evaporator sensor has registered a temperature higher than 5 C
the LEDs 4 and 5 are turned off.
5. Ice formation on the evaporator
The defrost function allows icing up for 30 minutes before defrosting of the evaporator coil is activated.

4.5. Defrosting

Active, demand-controlled defrosting is incorporated into the electronic control. The evaporator coil is
defrosted by means of hot refrigerant bypassing the condenser and being fed through the evaporator.
If the temperature falls to below 20ºC the evaporator may start to ice up after a short time. When the
evaporator sensor registers a temperature lower than 5ºC it will let the unit work in dehumidification
mode for further 30 minutes before switching over to defrosting mode.

4.6. Safety circuit

If the temperature in the dehumidifier increases to a temperature of more than 55ºC (in case of fan failure
or room air temperature higher than 30ºC), then the compressor stops automatically to avoid damaging it.
After 45 minutes the compressor starts again automatically.

5. Maintenance

The dehumidifier requires very little attention for trouble free running. All the necessary safety and
control functions have been built in. The fan motor and the compressor have permanent lubrication and
require no particular maintenance.

5.1. Cleaning of the filter, drip tray and drain

The air inlet filter has to be checked once a month and cleaned, if necessary. Remove the front cover
panel of the unit and take out the filter for cleaning. It can either be be rinsed in tepid soapy water or, if
not very dirty, vacuumed with a vacuum cleaner.
The drip tray and the drain must be cleaned so that the water unhindered can drain out.

5.2. Cleaning of the dehumidifier

Once a year the front cover panel should be removed in order to check the inside of the dehumidifier. If
the dehumidifier is dirty it should be cleaned by vacuum cleaning. The condenser in particular should be
thoroughly vacuumed. If the evaporator is badly soiled, it may be washed in tepid soapy water.
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