6996 0223 96 Issue A
© Edwards Limited 2016. All rights reserved. Page 27
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Ventilation:
Avoid recirculating the hot air from the pump ventilation ports back it to the pumps cooling system and
relief valve. This will cause inadequate cooling and unnecessary overheating.
The air velocity to the ventilation ducts to be limited to 5 m/s
The maximum air temperature at intake opening is 40°C (104°F), (minimum 0°C / 32°F)
Ventilation alternative 1 and 3 (refer the Installation proposal Drawings):
The required ventilation to limit pump room temperature can be calculated from:
Qv = 1.06 N / T
Where, Qv = required cooling air flow (m
3
/s)
N = Nominal motor power of pump (kW)
T = Temperature increase in pump room. (°C)
Ventilation alternative 2 and 4 (refer Installation proposal Drawings):
The fan capacity should match the pump fan capacity at a pressure head equal to the pressure drop caused
by cooling air ducts.
Maximum allowable pressure drop in ducting before or after the vacuum pump = 10 Pa.
Air intake filter (In case of overpressure pump)
If the air intake filter (1) is delivered loose, mount it in a leak-tight manner according to the following
instructions:
When replacing the air intake filter element, the dust may fall into the pump inlet and resulting damage
to the pump. The air intake filter (1) should be installed in a horizontal position to prevent filtered dust
falling into the pump inlet
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