3 Delivery pipe:
The pressure drop over the air delivery pipe can be calculated as follows:
Δp = (L x 450 x Q
c
1.85
) / (d
5
x P), with
d = inner diameter of the pipe in mm
Δp = pressure drop (recommended maximum: 0.1 bar (1.5 psi)
L = length of the pipe in m
P = absolute pressure at the compressor outlet in bar(a)
Q
c
= free air delivery of the compressor in l/s
Connect air outlet pipe of the compressor on top of the main air net pipe. In this way, there is a
minimum carry-over of condensate residue.
4 Ventilation:
When you install the inlet grids and ventilation fan, make sure that no re-circulation of cooling air
into the compressor or into the dryer is possible.
The maximum air velocity through the grids is 5 m/s (16.5 ft/s).
The maximum air temperature at the compressor intake is 46 ˚C (115 ˚F).
The minimum air temperature at the compressor intake is 0 ˚C (32 ˚F).
Alternatives 1 and 3: the required ventilation to limit the compressor room temperature is
calculated as follows:
• Q
v
= 1.19 N/ΔT (for units without dryer)
• Q
v
= 1.25 N/ΔT (for units with dryer)
Q
v
= Required ventilation capacity in m
3
/s
N = Shaft input of compressor in kW
ΔT = Temperature increase in compressor room in °C
Alternatives 2 and 4:
Make sure that the cooling air duct of the air/oil cooler is separated from the cooling air duct of the
dryer.
The maximum pressure drop over the additional air/oil ducts is limited to 10 Pa (0.04 in wc) for
the standard fan.
5 Drain pipes:
Connect the condensate drain outlets to a drain collector. See section Condensate system for the
position of the outlets.
The drain pipes to the drain collector must not dip into the water. If the pipes lead outside the
room where freezing is possible, they must be insulated.
Atlas Copco has oil/water separators (type OSD or OSCi) to separate the major part of the oil
from the condensate to ensure that the condensate meets the requirements of the environmental
codes.
6 Control module with monitoring panel.
7 Power supply cable:
Have the power supply cable installed by a qualified electrician.
In case of an IT network, consult Atlas Copco.
To preserve the protection degree of the electric cubicle and to protect its components from dust
from the environment, it is mandatory to use a proper cable gland when connecting the supply
cable to the compressor.
8 Filter, type DD for general purposes
The filter traps solid particles down to 1 micron with a maximum oil carry-over of 0.5 mg/m
3
.
A high-efficiency filter, type PD, may be installed downstream of a DD filter. This filter traps solid
particles down to 0.01 micron with a maximum. oil carry-over of 0.01 mg/m
3
.
If oil vapours and odours are undesirable, install a QD type filter downstream of the PD filter.
Install bypass pipes over each filter together with ball valves. This ensures that service operations
do not disturb the compressed air delivery .
9 Air tank:
Install the air tank (optional) in a frost free room, on a solid level floor suitable for taking the
weight.
Install a safety valve on the air tank.
Instruction book
2920 7109 23 77
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