Lauda UWT Series, Руководство по эксплуатации

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UWT circulation heat exchangers
14
Preparations
YAWE0029 / 29 June 2018
5.3 Draining / frost protection
If the unit is to be taken out of operation for a longer period of time or if ambient temperatures below
0 °C are to be expected, the unit must be drained. This must be carried out in two steps:
Draining the cooling liquid circuit:

Remove the cooling liquid hoses.

Reduce the set-point temperature. This causes the solenoid valve "Cooling liquid"
to open
(LED K 1 next to the temperature display illuminates).

Using compressed air or a similar gas applied to the cooling liquid inlet, drain the
cooling liquid circuit.

Alternatively: With the solenoid valve "Cooling liquid" switched on apply suction to
the connection "Cooling liquid outlet" using a waterproof industrial vacuum cleaner.
Draining the unit:

Switch off the circulation heat exchanger, withdraw the mains plug.

Let out the heat transfer liquid through the drain tap; fit a hose for this.
The drain tap is located right at the bottom on the back panel.

Unclip the hoses on the laboratory circuit.

Open the filling nozzle at the front.

With compressed air or similar gas blow strongly into the laboratory circuit to emp-
ty the heat exchanger.

Alternatively: First drain the bath contents into a suitable container and then apply
suction to the connection "Laboratory circuit return" with a waterproof industrial
vacuum cleaner (with the filling nozzle on the front of the unit open).


Switch off the unit before removing the hose connections.

Longer periods of dry running, i.e. with operation below the minimum level of the
bath, leads to bearing damage on the pump.