5 | Installation
14 | 40
Instruction Manual R5 RD 0200-0360 A_EN_en
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) [
21].
●
Make sure that the cooling water complies with the following requirements:
Min. supply capacity
l/min
2.5
Water pressure
bar
2 ... 6
Supply temperature
°C
+5 ... +35
Required pressure differential across supply
and return
bar
≥
1
●
To reduce the maintenance effort and ensure a long product lifetime we recommend the
following cooling water quality:
Hardness
mg/l (ppm)
< 90
Properties
Clean & clear
PH value
7 ... 8
Particle size
µm
< 200
Chloride
mg/l
< 100
Electrical conductivity
µS/cm
≤
100
Free chloride
mg/l
< 0.3
Materials in contact with the cooling water
Stainless steel, copper and cast iron
NOTE
Water hardness unit conversion.
1 mg/l (ppm) = 0.056 °dh (german degree) = 0.07 °e (english degree) = 0.1 °fH (french degree)
5.3
Filling Oil
NOTICE
Use of an inappropriate oil.
Risk of premature failure!
Loss of efficiency!
●
Only use an oil type which has previously been approved and recommended by Busch.
For oil type and oil capacity see Technical Data [
37].
