Through flow coolers
16/03/2018 / YAFE0004
General construction and technical description
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General construction and technical description
These operating instructions apply to four through-flow coolers of various cooling capacities.
Common feature of all four units are the air-cooled, fully hermetically sealed and thus maintenance-
free refrigeration units, the heat carrier circuit in stainless steel and the possibility of electrical
connection to LAUDA thermostats.
The refrigeration unit consists essentially of a hermetically sealed compressor. Heat of condensation
and motor heat are dissipated through a fan-cooled finned tube condenser. The fresh air is drawn in at
the front of the unit; the heated is discharged to the back and to the side. In order to ensure problem-
free air circulation the ventilation openings must not be obstructed.
The compressors have an over-temperature cut-out which acts on the compressor temperature and
current consumption of compressor. Furthermore the cooling system is protected by an overpressure
cut-out against excessive pressure.
The built-in refrigeration unit continuously cools down a heat exchanger (evaporator) insulated with
polyurethane foam. The connections of the heat exchanger are mounted at the back and are provided
with tube fittings M16 x 1 to connect olives with a diameter of 13 mm / 11 mm or metal hoses. The
pump of the connected thermostat pumps the heat transfer liquid through the heat exchanger of the
through-flow cooler. The through-flow cooler continuously cools down and the thermostat maintains
the required temperature by means of controlled counter-heating.
The through flow cooler DLK 45 equipped with LAUDA heating thermostats of the Ecoline E 3XX
series and older thermostats with incorporated P electronics allow a method of operation
corresponding to the proportional cooling. The cooler DLK 45 LiBus with LAUDA heating thermostats
with LiBus (at present Proline) also allows a method of operation which is equivalent to the
proportional cooling.
The cooling capacities indicated in the technical data sheet are gross values. To get the true effective
cooling capacities in case of operation, the heat emission of the pump as well as the insulation losses
have to be taken into consideration and deducted. This is decisive for the lowest temperature which
can be reached if a thermostat is connected. The indicated operating temperature range refers to the
combination with a small or medium-sized bath/circulation thermostat.
(i. e. DLK 10
– E 103; DLK 25 – P 8 C; DLK 45 – PVL 24.)