Dantherm cdp 165, Service Manual

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24
Product and functional description,
continued
Fan If a water heating coil is used, the fan will start when heat is switched on. The fan con-
tinues to run for 30 seconds after the heat has been switched off. On condition, how-
ever, that the water heating coil is connected to the control signal through terminal
points 1 and 2.
If the water heating coil is controlled externally and is not connected to the unit control,
the fan will not automatically be switched on when the water heating coil is connected.
The control of CDP 75 MK II/125 MK II/165 has an option for connecting an external
ON/OFF switch for continuous fan operation
– allowing the fan to be running inde-
pendently of the dehumidification and/or heating requirements. The switch is con-
nected to terminals 7 and 8 and the outlet for the switch is 12 V. The bridge between
terminals 7 and 8 has to be removed first.
Compressor The number of compressor startings is limited by a 6 minutes timer, which starts up
when switching on the compressor. The timer must have come to an end before the
compressor can be switched on again.
The control system of the unit has a time delay of 75 seconds. This means that each
time the unit has been switched off on the main switch or on the hygrostat, it will take
75 seconds before the compressor can be switched on again.
This is a safety function protecting the compressor against overloading caused by too
high pressure in the cooling circuit at the start-up.
LP/HP pressostat The CDP 75 MK II, CDP 125 MK II and CDP 165 are fitted with a reset button of the HP
pressostat on the inspection side
Thermal relay The CDP 125 MK II(3x400V) and CDP 165(3x230V/3x400V) are additionally fitted with a
reset button for the thermal relays. This protects the compressor.
Klixon The compressors in CDP 75 MK II(1x230V) and CDP 125 MK II(1x230V) are protected by
a Klixon and not by a thermal relay