Vacuum And Water Distribution - Heidolph LABOROTA 20 control automatic Betriebsanleitung

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47. Vacuum and water distribution

The rear panel of the unit contains a vacuum/water distributor. A central cooling water supply
optionally works with:
1 chiller; 1 chiller plus 1 after-chiller, or 2 chillers. Refer to picture above when connecting the
water hoses (ID=8 mm). Hoses are routed in the chiller panel and attached to the chiller with hose
nipples. Inlet flow control uses a ball valve (4). When using 2 chillers, open ball valve (5) (lever in-
line); when using 1 only chiller, close ball valve (6) (lever out-of-line). The same applies to the
coolant return network. When using 2 chillers, open ball valve (6) (lever in-line), using 1 only chiller,
close ball valve (6) (lever out-of-line).
Connect #1 chiller with the fittings (13). Coolant return is connected with fitting (17).
Connect vacuum distributor with fitting (8) on glass kit. Vacuum hose is routed in the chiller panel
to glass kit fitting and attached with screwed nipples. The built-in aerating valve (9) is controlled
from the control panel.
The aerating valve (9) is connected with #3 terminal connector (6-pin) (11).
Water refill solenoid valve (12) is connected with the lower terminal connector (4-pin) (10).
The cooling coils of the cooler may only be exposed to a maximum cooling water
pressure of 2 bar. So that higher pressure can never develop, no valve and no
restrictor may be installed in the cooling water return.
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