GEV GP 100, Mounting And Operating Instructions, Page: 13 / 43

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GP+GP – Maintenance book Pag.
13 of 43
B.7 Pump stop
GP vacuum pumps are equipped in suction by an anti-suckback valve closing the suction when
vacuum pump is off keeping vacuum steady in all the connected appliances thus avoiding the flush
back of oil into the appliance same. Therefore, under normal circumstances, pump stops after
disconnection to mains.
Warning
If a vacuum pump has been disconnected due to the intervention of the thermalswitches or other
safeties, pump has to cool up to environmental temperature and start up must be manualy carried
out provided that stopping reason has been erased. For avoiding the sudden vacuum pump starts up
it is recommended to start it again manually.
B. 8 Ultimate pressure of the group
If the values stated in the technical sheets have not been achieved during process, measure the
ultimate pressure directly to pump suction inlet after its disconnection from system.
After a long period of storing and after oil changement,it is advisable to wait for a while before
pump reaches its max pressure. Infact vacuum pump must reach its functioning temperature while
the oil is degassing. The best max pressure can be achieved wih a low pump temperature and using
the recommended oils. The max vacuum level of the vacuum group can be changed by the vacuum
switches adjustments.
B.9
Assembling of gasballast valve – Option
Vacuum pumps type GP are supplied without gasballast. This gasballast can be assembled also
afterwards .
C. MAINTENANCE
Warning

Disconnect electric supply before disconnecting group. It is important that group does not start
up accidentally.

If vacuum group has sucked dangerous substances, check the nature risk and take the adequate
safety precautions. When sending back vacuum pumps to manufacturer, it is advisable to
indicate if these are free from dangerous substances. In that case, check nature risk.

Pumps must be properly packed so that it does not get damaged during transport and it does not
permit the pouring out of dangerous substances

When wasting the exhaust oil , follow the environmental norms, any intervention must be
skilled personell

Use only original spare parts
Maintenance or repairing being wrongly carried out or using unproper materials could
damage the pump

Maintenance or repairing must be carried out by skilled technicians as an uncorrect intervention
on pumps could affect their lifetime and performances thus cancelling the warranty.

Do not use weared gaskets, use new one.