5.2.3 Exhaust duct design
The machine can only overcome the air resistance at the cooling air inlet and exhaust determined
by the duct design. Any additional air resistance will reduce airflow and deteriorate machine cool‐
ing.
➤ Consult an authorized KAESER SERVICE representative before deciding on:
■ Design of the exhaust air ducting
■ Connection between the machine and the exhaust air duct
■ Length of the ducting
■ Number of duct bends
■ Design of flaps or shutters
Use only motorized ventilation flaps and louvers on variable frequency drive (SFC) machines.
Flaps or shutters that are opened by the action of airflow against the force of gravity do not
open sufficiently at low compressor drive motor speeds.
Further information Further information on the design of exhaust air ducts can be found in chapter 13.3.
5.3 Operating the machine in a compressed air system
When the machine is connected to a compressed air system, the system operating pressure must
not exceed 232 psig.
Initial charging of a fully vented air system creates a very high rate of airflow through the air treat‐
ment devices. These conditions are detrimental to correct air treatment. Air quality suffers. To en‐
sure the desired air quality when charging a vented air system, we recommend the installation of
an air main charging system.
➤ Consult an authorized KAESER service representative for advice on this subject.
5 Installation and Operating Conditions
5.3 Operating the machine in a compressed air system
34
Operator Manual Screw Compressor
SM Tri-Voltage, SIGMA CONTROL 2 9_5875 33 USE
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