Edwards E2M18 User Manual

Turn the gas-ballast control from two to six turns an-clockwise to increase the gas-
ballast from zero ow. Use gas-ballast ow:
▪ To pump high concentraons of condensable vapour.
▪ To decontaminate the oil.
When operang the pump with the gas-ballast control open there will be an increased
rate of oil loss from the pump. Ideally, a mist lter and oil return kit should be used on
clean applicaons.
5.3 Start-up
WARNING:
Do not block the pump outlet or allow the outlet pressure to rise above 1.5 bar
absolute. The oil box may fracture and may cause injury to people nearby.
If the oil is contaminated, or if the pump temperature is below 13 °C, or if the electrical
supply voltage is more than 10% below the lowest voltage specied for the pump, the
pump may operate at a reduced speed for a few minutes. On single-phase pumps, if the
pump connues to operate at reduced speed, the motor thermal overload device will
open and stop the pump. When the motor has cooled, the thermal overload device will
reset automacally and the pump will restart.
1.
Check that the pump oil-level is between the MAX and MIN marks on the bezel of
the oil-level sight-glass; if it is not, refer to Check the oil level on page 37.
2. Turn the gas-ballast control to the required posion (refer to Gas-ballast control on
page 32).
3.
Switch on the electrical supply to the pump.
4. Check that the oil-level in the sight-glass drops slightly (by 3 to 5 mm) aer start-
up. This shows that the pump has primed with oil.
5. If the pump fails to prime, operate the pump with the inlet open to atmosphere for
approximately 30 seconds. Then isolate the inlet and check that the oil-level drops
by 3 to 5 mm.
6. To achieve ulmate vacuum, pump condensable vapours or decontaminate the
pump oil, refer to the procedures in To achieve ulmate vacuum on page 33, To
pump condensable vapours on page 34 and To decontaminate the oil on page 34
respecvely. Otherwise, open the vacuum system isolaon-valve.
5.4 To achieve ulmate vacuum
If the pump does not achieve the performance specied in Performance, make sure that
this is not due to the system design before you contact supplier or us for advice, In
parcular, the vapour pressure of all materials used in the vacuum system (including
pump oil) must be much lower than the specied ulmate vacuum of the pump.
Refer to The pump fails to achieve specied performance (failure to reach ulmate
vacuum) on page 41 for a list of possible causes for failure to achieve the specied
performance, note however that the most common causes are:
▪
Pressure measurement technique or gauge head is unsuitable or the gauge head is
faulty.
Page 33
A34310880_T - Operaon

Edwards E2M18 Specifications

General

Brand	Edwards
Model	E2M18
Category	Water Pump
Language	English