2920 1449 00
16
Instruction book
Ref. Description
1 Install the compressor on a level floor suitable for taking
the weight of the compressor. For ventilation proposal
1, the minimum distance between the top of the
bodywork and the ceiling is 1200 mm.
2 Remove the plastic plug (if provided) from the
compressor air outlet pipe (3-Fig. 3.4) and fit the air
outlet valve 1) to the pipe. Close the valve and connect
it to the net.
3 The pressure drop over the air outlet pipe can be
calculated as follows:
dp = (L x 450 x Qc
1.85
) / (d
5
x p)
dp = pressure drop (recommended maximum =
0.1 bar)
L = length of outlet pipe in m
d = inner diameter of the outlet pipe in mm
p = absolute pressure at the compressor outlet
in bar(a)
Qc = free air delivery of the compressor in l/s
It is recommended that the connection of the compressor
air outlet pipe is made on top of the main air net pipe to
minimize carry-over of possible remainder of
condensate.
As a rule of thumb, following formula can be used to
calculate the recommended volume of the air net:
V = (30 x C x p x Q) / dp
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 Correction factor 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
Ref. Description
4 The inlet grids and ventilation fan should be installed in
such a way that any recirculation of cooling air to the
compressor is avoided. The maximum air velocity
through the grids is 5 m/s.
The required ventilation to limit the compressor room
temperature can be calculated as follows:
Qv = 0.92 N/dT (GR) Qv = 0.1 N/dT (GR W)
Qv = required ventilation capacity in m³/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 Remove the plastic plugs (if provided) from the
condensate outlets (Fig. 3.4) and fit the manual
condensate drain valves (1 and 2-Fig. 3.4). 2) Lay out
the drain piping towards the condensate collector. The
drain pipes must not dip into the water of the drain
collector. For draining of purified condensate water, an
oil/water separator (type OSD) can be integrated in the
bodywork. It is recommended to provide a funnel to
allow visual inspection of the condensate flow.
For GR W, fit a water shut-off valve and water drain
valve in the compressor water inlet pipe and outlet pipe.
Remove the plastic plugs (if provided) from the
compressor water pipes and connect the pipes to the
cooling water circuit.
6 Location of the Elektronikon regulator.
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.
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