Air Flow; Cooling System; Air-Cooled Fluid Coolers; Aftercoolers - Quincy QSI-90 Instruction Manual

Air Flow

When the compressor is operating,
a partial vacuum is produced at the
compressor inlet. Air entering via the air
fi lter fl ows through the inlet valve into
the rotor housing where it is compressed,

Cooling System

Air-cooled Fluid Coolers

The air-cooled fl uid cooler and aftercooler
are fi nned aluminum plate design. QSI-
90, 120 and 140 models use a one-piece
combination cooler/aftercooler. Ambient
air is induced through the fi ns by a
centrifugal fan, cooling the fl uid and air in
the plates. To maintain proper compressor
operation, the ambient air temperature
should not exceed the temperatures listed
in Appendix B - Technical Data. The cooler
fi ns must be kept clean at all times. Fluid
leaving the receiver passes through a
thermal mixing valve before traveling on
to the cooler. The purpose of the thermal
valve is to maintain a minimum fl uid
discharge temperature at the compressor
of approximately 190°F.
Section II - Description
then discharged into the air/fl uid reservoir.
Compressed air passes through the air/
fl uid separator, then through a minimum
pressure check valve, through the
aftercooler and moisture trap to the service
connection.

Aftercoolers

Aftercoolers reduce the amount of water
in the discharge air. They are used to
lower the temperature of the discharge
air thereby condensing water vapor from
the compressed air. This allows most of
the contained water to be trapped and
expelled from the unit, reducing water
related problems downstream.

Moisture Separator

A combination moisture separator and
water trap is provided for collecting and
expelling water to the customer's drain.
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