WhisperAir™ Oil-free Rotary Tooth Compressor
Model Series PCC & PCCMD – 50 HP
Powerex • 150 Production Drive • Harrison, OH 45030 • USA
(T) 1.888.769.7979 • (F) 513.367.3125 • www.powerexinc.com
IN594501AV • 02/2016
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Please read and save these instructions. Read carefully before attempting to assemble, install, operate or maintain the product described. Protect
yourself and others by observing all safety information. Failure to comply with instructions could result in personal injury and/or property
damage! Retain instructions for future reference.
Installation, Operation and Basic Maintenance Instructions
Description
The Powerex WhisperAir™ Rotary Tooth Compressor
System is an enclosed two-stage air-cooled oil-free
rotary tooth air compressor. A touch panel control is
installed on the compressor enclosure.
Air Flow
Air drawn in through intake filter (IF) and intake
throttle valve (IV) is compressed in the low-pressure air
end and is discharged to the intercooler (CI). Air,
cooled in the intercooler (CI), is discharged to the drain
separator for intercooler (DS1), removing the
condensate water, and is compressed in the high-
pressure air end (Eh). Then, the compressed air passes
through the pulsation damper (PD) and flows into
aftercooler (Ca). Air, cooled in the aftercooler (Ca), is
then discharged to the drain separator for aftercooler
(DS2), removing the water and is delivered to the air
outlet.
The water, separated by the drain separators
(DS1/DS2), will be discharged through electronic drain
valves (EV1/EV2). When the compressor switches to
unload operation, the air trapped in the pulsation
damper (PD) and the high-pressure air end (Eh) is
blown off through unload silencer (US). The check
valve (CV) is installed downstream of pulsation damper
(PD) to prevent compressed air blows back into the
compressor during unloaded operation.
For PCCMD models, the intake air is configured for
connection to the facility remote intake piping.
Oil Flow
Oil is circulated by oil pump (OP). Oil flows from oil
tank (GC), through oil cooler (Co) and oil filter (OF), to
bearings and the gears. When the oil pressure reaches
a given value, by-pass valve is opened to decrease the
pressure.
Symbol
Name
Symbol
Name
IF
Intake filter
Co Oil cooler
US Unload silencer
OF Oil filter
IV Intake valve
FN Cooling fan
EI
Air end (low pressure)
PS Pulsation damper
Ci
Intercooler
CV Check valve
EV1 Electronic drain valve
Ca Aftercooler
Eh Air end (high pressure)
EV2 Electronic drain valve
(for aftercooler)
OP Oil pump
DS1 Drain separator
(combined with EV1)
GC Oil tank (gear case)
DS2 Drain separator
(combined with EV2)
Diagram 1: Air Flow and Oil Flow
