Technical product description
HDK350_EN_01_2005-05-10
21
Freezing of valves, cocks, flaps, and other components at low temperatures
Therefore, a planned outside installation must always be discussed in advance
with the manufacturer to allow specific technical design measures to be provided
for the installation location.
Auxiliary heater
For installation sites with temperatures under +1 ºC (33,8 °F), the wet side of the
dryer must be equipped with an auxiliary heater to prevent valves, cocks, flaps,
and other components from freezing up.
Signalling contacts of the control system
The control system is equipped with a digital input for the synchronised operation
with a compressor. This feature allows for synchronised and thus efficient dryer
operation with discontinuous compressor operation.
The control system can also be equipped with an optional operation signalling
contact with which the dryer operation can be monitored from an external device.
Dryers with the optional
dewpoint-sensing control
are equipped with such a
contact as standard. It is used for the transmission of operating signals and for
the output of dewpoint alarms.
Regeneration gas return for compressor synchronisation
Compressor synchronisation helps reduce energy costs, as the dryer can be
operated independently of the compressor.
When the compressor is switched off, the regeneration gas return ensures that
regeneration is continued, as soon as a certain compressed air volume is
reached behind the dryer.
The regeneration gas return must be adjusted to suit the installed compressed air
system. Prior to installation, please consult the manufacturer.
The regeneration gas return option cannot be combined with the optional start-up
device.
Dewpoint-sensing control
With a dewpoint-sensing control system, you can operate the dryer in fixed or
variable cycles. In the fixed cycle, switchover is effected after a fixed time period
(usually after 5 minutes). In the variable cycle, the switchover is effected in
relation to the dew point reached and the charging of the drying agent . The
adsorption time in the variable cycle amounts to 60 minutes maximum.
Pneumatic control
A pneumatic control system can be used wherever an alternative to the electronic
control system is required, such as e.g. in explosion hazard areas.
Summary of Contents for HDK 50/100
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