All piping to be connected stress free to the compressor.
Installation guidelines
1. Install the compressor unit on a solid, level floor suitable for taking its weight. The recommended minimum
distance between the top of the unit and the ceiling is 900 mm (35 in). The air receiver must not be bolted
to the floor. The minimum distance between the wall and the back of the compressor must be 500 mm
(19.5 in).
2. Position of the compressed air outlet valve.
To facilitate the access to the dryer during maintenance operations, provide a flexible connection between
the air outlet valve and the air net.
Close the valve.
Connect to the air net
3. The pressure drop over the air delivery pipe can be calculated from:
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 in bar (recommended maximum: 0.1 bar (1.5 psi))
L = Length of the pipe in m
P = Absolute pressure at the compressor outlet in bar
Q
c
= 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 in order to minimise carry-over of possible condensate residue.
4. Ventilation: the inlet grids and ventilation fan should be installed in such a way that any recirculation of
cooling air to the compressor or dryer is avoided. The maximum air velocity through the grids is 5 m/s
(16.5 ft/s).
The maximum allowable pressure drop over the cooling air ducts is 30 Pa (0.12 in water column).
If it is greater than this value, a fan is needed at the outlet of the ducts. Consult Atlas Copco.
For alternatives 1 and 3, the required ventilation capacity to limit the compressor room temperature
can be calculated as follows:
• Q
v
= 1.16 N/ΔT for units without optional dryer
• Q
v
= (1.16 N + 0.6)/ΔT for units with optional dryer
Q
v
= Required ventilation capacity in m
3
/s
N = Shaft input of compressor in kW
ΔT = Temperature increase in the compressor room in °C
For alternatives 2 and 4: the fan capacity should match the compressor fan capacity at a pressure head
equal to the pressure drop across the air ducts.
5. The drain pipes to the drain collector must not dip into the water of the drain collector. Atlas Copco has
oil/water separators (type OSD) to separate the major part of the oil from the condensate to ensure that
the condensate meets the requirements of the environmental codes.
6. Position of control panel.
7. Mains cable
To preserve the protection degree of the electric cubicle and to protect its components from
dust from the environment, it is mandatory to use the supply cable and cable gland delivered
with the compressor.
8. Filter, type DD for general purposes (optional). The filter traps solid particles down to 1 micron with a
max. oil carry-over of 0.5 mg/m
3
. A high-efficiency filter, type PD (optional), may be installed downstream
of a DD filter. This filter traps solid particles down to 0.01 micron with max. oil carry-over of 0.01 mg/
Instruction book
2920 7090 51 125
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