24
Operation
Fig. 12: Cooling water controller 41
With a screw driver set setting disk 1 of the cooling water controller to the desired op-
erating temperature.
– Factory setting is 50 °C, i.e. bearing oil temperature < 85 °C.
– Replacement controllers are not preset, set temperature is 50 °C measured outside
on the immersion tube of temperature sensor 53.
6.3
Pumping condensable vapours
To increase water vapour compatibility, the pump is fitted with a gas ballast valve 5.
To avoid condensation in the pump when pumping condensable vapours, air or inert gas
(option) is fed into the working chamber at the beginning of the compression phase via
the gas ballast valve 5.
1
Setting disk
2
Setting scale
3
Arrow for temperature setting
41
cooling water controller
123 Vent screw
°F
°C
Q
3
2
1
123
41
NOTICE
Bad final vacuum and damage to the pump!
Danger of condensation and corrosion due to exceeding the water vapour compatibility
during operation without gas ballast or in case of insufficient supply of flushing gas.
Only pump vapours when the pump is warm and the gas ballast valve is open.
When the process has been completed, allow the pump to continue running for
about 30 minutes with the vacuum flange closed and the gas ballast open for oper-
ating fluid regeneration purposes.
