Instruction manual

8. Use
3
/
8
inch BSP fittings to connect a suitable pipeline to the end-cover. Connect the other
end of the pipeline to your evacuation pump.
3.11 Leak-test the installation
WARNING
Leak-test the system after installation and seal any leaks found to prevent the leakage of
dangerous substances from the system and leakage of air into the system.
Leak-test the system after installation and seal any leaks found. Dangerous substances which
leak from the system will be dangerous to people and there may be a danger of explosion if air
leaks into the system. We recommend that the leak rate is 1 x 10
-3
mbar l s
-1
(1 x 10
-1
Pals
-1
)
helium or less.
3.12 Commission the installation
3.12.1 Adjust the thermostatic control-valve (TCV)
CAUTION
Do not adjust the TCV to a lower setting (that is, towards 0) when the DP180 is hot. This
will increase the flow of cooling-water which may damage the DP180 because of the
differential contraction of the pump rotor and case.
The TCV regulates the flow of water through the pump cooling-jacket to maintain the DP180 at
the required operating temperature. The TCV can be adjusted between 0 (minimum) and 5
(maximum). Adjustment of the TCV varies the operating temperature of the DP180.
You must adjust the TCV to suit your operating conditions. Use a high TCV setting when you
pump condensable vapours to prevent condensation in the pump.
We recommend that you do not exceed a maximum DP180 operating temperature of 65
o
Cin
normal use (that is, a TCV setting of 3 to 3.5). If you set the TCV at a higher temperature, the
thermal snap-switch will operate to shut down the DP180.
DP180 Dry Vacuum Pump 19