BUSCH RA 0165 D, Instruction Manual

Page: 13 / 44

Installation | 5
Instruction Manual R5 RA 0165-0305 D_EN_en 13 | 44
5.2.3 Cooling Water Connection (Optional)
WHE CWO CWI
CWO TV PS
WBV WF CWI WHE
1
2
Description
1 Water-oil heat exchanger without inlet
accessories 2 Water-oil heat exchanger with inlet
accessories
Description
CWI Cooling water inlet PS Pressure switch
CWO Cooling water outlet WBV Water bypass valve
WHE Water-oil heat exchanger WF Water filter
TV Thermostatic valve
The thermostatic valve (TV) is used to control the water flow in order to keep a stable vacuum pump
temperature.
The factory default adjustment of the thermostatic valve (TV) is set in position 2 (approx. 75°C oil
temperature).
The pressure switch (PS) is used to monitor the presence of water at the cooling system of the
vacuum pump.
When the pressure switch detects a pressure lower than 2 bar, the vacuum pump must be stopped.
The water bypass valve (WBV) is used at the first vacuum pump start-up. At that moment it should
be open (approx. 90 seconds) to prime the water heat exchanger, afterwards it should be closed.
●
Connect the cooling water connections (CWI / CWO) to the water supply.
Connection size:
– 19 mm hose (CWI / CWO)
●
If necessary, electrically connect the pressure switch (PS), see Wiring Diagram Pressure Switch of
Water-oil Heat Exchanger (Optional) [
➔
22].
●
Make sure that the cooling water complies with the following requirements:
Min. supply capacity l/min 2.5