2920 1251 02
19
Instruction book
V = recommended air net volume in l
dP = pressure difference between unloading and
loading pressures in bar (recommended
minimum = 0.6)
p = compressor inlet pressure in bar absolute
Q = free air delivery of compressor in l/s
C = correction factor, see below
Air consumption divided C
by compressor air delivery
0.9 0.10
0.8 0.15
0.7 0.20
0.5 0.25
0.3 0.20
0.2 0.15
0.1 0.10
Example: air consumption = 360 l/s
compressor air delivery = 450 l/s
inlet pressure = 1 bar absolute
unloading pressure = 7.5 bar(e)
loading pressure = 6.8 bar(e)
Recommended air net volume (sum of receiver volume
and volume of pipe net) = 2900 l. Consult Atlas Copco
if in any doubt.
4. The inlet grids and ventilation fan should be installed in
such a way that any recirculation of cooling air to the
compressor or dryer (optional) is avoided. The air
velocity to the grids is limited to 5 m/s.
The required ventilation to limit the compressor room
temperature can be calculated as follows:
For proposals 1 and 3: Qv = 0.92 N/dT
Qv = required ventilation capacity in m
3
/s
N = shaft input of compressor in kW
dT = temperature increase in compressor room
If cooling air ducts are installed, the maximum allowable
pressure drop over the ducts is 30 Pa. The maximum
pressure drop depends on the ambient temperature. The
fan capacity should match the compressor fan capacity
at a pressure head equal to the pressure drop caused by
the cooling air outlet ducts. Consult Atlas Copco.
5. Fit manual condensate drain valve (Dma-Fig. 8). Lay
out the drain piping from valve (Dma) and from
automatic drain outlet (Daa) towards the condensate
collector. The drain pipes must not dip into the water
of the drain collector. For draining of pure condensate
water, install an oil/water separator. See section 1.1. It
is recommended to provide a funnel to allow visual
inspection of the condensate flow.
For GA W, fit a valve in the compressor water inlet
pipe and outlet pipe. Also provide water drain valves.
Remove the plastic plugs (if provided) from compressor
water pipes (4 and 7-Fig. 8) and connect the pipes to
the cooling water circuit.
6. Position of Elektronikon control panel.
7. See section 2.3 for the recommended size of the supply
cables. Check that the electrical connections correspond
to the local codes. The installation must be earthed and
protected against short circuits by fuses in all phases.
An isolating switch must be installed near the
compressor.
Daa. Automatic condensate drain outlet
Dma. Manual condensate drain valve
1. Pictograph, manual condensate drain
2. Pictograph, automatic condensate drain
3. Location of air outlet valve
4. Cooling water inlet 1)
5. Pictograph, cooling water inlet 1)
6. Pictograph, cooling water outlet 1)
7. Cooling water outlet 1)
Fig. 8. Air outlet and condensate drain outlets
1) GA W only
4
567
3
1
2
Dma Daa
50751F
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