Preparations For Commissioning; Cooling Air Volume/Minimum Cross - Gardner Denver L55 User And Service Manual

7

Preparations for commissioning

7.1

Cooling air volume/minimum cross

a
Fig. 9
1 Cool air intake
2 Cool air exhaust
3 Switch cabinet cool-air intake
(only water-cooled units)
The cooling air volume required by these screw
compressors is as follows:
Air-cooled 60 Hz Compressors:
L55, L55RS: 4308 cfm
L75, L80, L75RS: 6003 cfm
Water-cooled 60 Hz compressors:
approx. 3531 cfm
If conditions are not favorable, we recommend the
installation of venting ducts. However, the velocity of
the cooling air should not exceed 17ft/sec. We
recommend a minimum duct cross-section of approx.
2
10 ft .
28
NOTICE
The stated minimum cross-section refers to a
maximum duct length of 16.4 ft and a maximum
of one bend. In the event of differing values
(over 16.4 ft, more than one bend, filter
cartridges, screens, etc.), please contact your
technical adviser.
Gardner Denver screw compressors are rated
for ambient temperatures and cooling
temperatures of 35.6 °F to 104 °F.
In the case of temperatures other than the
above limiting values, please consult your
technical adviser.
NOTICE
In order to ensure a good heat dissipation,
auxiliary fans should be rated to process
approximately 15 to 20% more air volume than
the total cooling air quantity required by the
compressors installed in the compressed air
station.
The figures below show the recommended ventilation
sections arrangement:
AIR CHANNEL
FAN
Fig. 9 b
AIR
INTAKE
AIR
INTAKE
August 20, 2018