Phase 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 (16.5 ft/s).
The required ventilation to limit the compressor room temperature can be calculated as
follows:
For SI Units:
On air-cooled compressors: Qv = 0.92 N/dT
On water-cooled compressors: Qv = 0.1 N/dT
Qv = Required ventilation capacity in m
3
/s
N = Shaft input of compressor in kW (for Pack compressors)
N = Shaft input of compressor in kW + heat dissipated by dryer in KW (for Full-Feature
compressors)
dT = Temperature increase in compressor room
For British/American Units:
On air-cooled compressors: Qv = 2618.5 N/dT
On water-cooled compressors: Qv = 284.5 N/dT
Qv = Required ventilation capacity in cfm
N = Shaft input of compressor in hp (for Pack compressors)
N = Shaft input of compressor in hp + heat dissipated by dryer in hp (for Full-Feature
compressors)
dT = Temperature increase in compressor room
If cooling air ducts are installed, the maximum allowable pressure drop over the ducts is
30 Pa (0.12 in wc). 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 and fit the manual
condensate drain valve. Lay out the drain piping towards the condensate collector. The
drain pipes must not dip into the water of the drain collector. It is recommended to provide
a funnel to allow visual inspection of the condensate flow.
6 Location of the Elektronikon regulator.
7 See Electric cable size 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.
- A water shut-off valve and water drain valve in the compressor water inlet pipe and outlet
pipe can be installed by the customer. If water shut-off valves are installed, a safety device
with set pressure according to the maximum cooling water inlet pressure has to be installed
between the compressor water outlet pipe and the shut-off valve. When operating the unit,
the operator must ensure that the cooling water system cannot be blocked.
The above mentioned also applies for the energy recovery cooling system.
Remove the plastic plugs (if provided) from the compressor water pipes and connect the
pipes to the cooling water circuit.
For water-cooled compressors, the cooling water system installed outside the compressor
must be protected by a safety device with set pressure according to the maximum cooling
water inlet pressure.
Instruction book
2920 1728 05 85
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