7 Power supply cable to be sized and installed by a qualified electrician.
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 Provision for energy recovery system.
9 Filter DD for general purpose filtration (particle removal 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
vapors and odors are undesirable, a QD type filter can be installed downstream of the PD filter.
It is recommended to install bypass pipes with ball valves over each filter in order to isolate the filters
during service operations without disturbing the compressed air delivery.
10 Install the air receiver (to be purchased separately) in a frost free room, on a solid, level floor, suitable
for taking its weight.
For normal air consumption, the volume of the air net (receiver and piping) can be calculated from:
V = (0.25 x Q
c
x P1 x T0)/(fmax x ΔP x T1), with
V = volume of the air net in l
Q
c
= free air delivery of the compressor in l/s
P1 = compressor air inlet pressure in bar(a)
fmax = maximum cycle frequency (recommended: 1 cycle/30s)
ΔP = difference between unloading pressure and loading pressure in bar
T1 = compressor air inlet temperature in K
T0 = air receiver temperature in K
11 Bypass system to bypass the dryer during service operations (available as an option, consult Atlas
Copco).
12a Air-cooled compressors:
To prevent feedback of exhaust air into the cooling inlet, sufficient space should be foreseen above
the unit to evacuate the exhaust air. Otherwise a duct for the exhaust air should be installed. See
alternatives 1 up to 4.
12b Water-cooled compressors:
Water flow and pressure to be adjusted depending upon local conditions.
For cooling water quality, see section Cooling water requirements.
A water shut-off valve and a water drain valve should be installed by the customer in the compressor
water inlet pipe and outlet pipe. If water shut-off valves at the compressor water inlet and outlet pipe
are installed, a safety device with set pressure according to the maximum cooling water inlet
pressure (see section Reference conditions and limitations) has to be installed between the
compressor water outlet pipe and shut-off valve. When operating the unit, the operator must ensure
that the cooling water system cannot be blocked. The above mentioned applies also to the energy
recovery cooling water system. Remove the plastic plugs (if provided) from the compressor water
pipes and connect the pipes to the cooling water circuit.
13 Cooling air grating, dryer
14 When a duct is foreseen on the air inlet, the ambient temperature sensor need to be repositioned
in such a way that the inlet temperature is monitored.
15 Safety valve
Safety
The operator must apply all relevant safety precautions, including those mentioned in this book.
Instruction book
2920 7109 60 151
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