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Section II - Description
10 Quincy Compressor
®
- QSD™
Cooling System
Water-cooled
The QSD
™
water-cooled cooling system is divided into
two parallel circuits.
The coolant flows from the inlet manifold through the
intercooler, into the stage one compressor jacket and
from the compressor jacket to the outlet manifold.
The second circuit flow is to the aftercooler, to the fluid
cooler located in the gearbox and finally through the
stage two compressor jackets to the outlet manifold.
The inlet coolant manifold contains a coolant flow switch
which prevents the compressor from starting if there is
inadequate coolant flow. The switch will also shut down
the compressor if there is a loss of coolant.
NOTE
If the compressor is shut down during freezing
weather, the drain plugs located at both ends on
the underside of the coolers along with the plug
on the coolant line from the fluid cooler should
be removed. Compressed air at 15-20 psig should
be injected into the system to remove the
remaining coolant.
To maintain the efficiency of the cooling system
provisions have been made for chemical cleaning of the
system.
To conserve water, an optional, normally closed solenoid
valve is available. This valve will automatically start and
stop the water flow in unison with the compressor. The
valve should be located in the inlet line to the compressor
to provide isolation of the compressor cooling system
from the supply.
Air-cooled
The QSD
™
air-cooled cooling system is comprised of
three separate cooling sections.
The first cooler is the intercooler, which reduces the stage
one discharge temperature. The air then passes through a
moisture separator/trap, then into stage two of the
compressor.
The stage two cooler cools the water/glycol (70/30)
mixture which is circulated through the fluid cooler and
the jackets of the compressor stages.
The third cooling process takes place in the aftercooler
which cools the discharge air from stage two, which then
passes through a moisture separator/trap assembly before
entering the distribution system.
A coolant flow switch is installed to prevent the
compressor from starting if the coolant circulating pump
fails or to shut down the compressor if there is a loss of
coolant.
NOTE
If the compressor is shut down for an extended
period and temperatures are expected to be less
than 0°F, drain system of all coolant.
A fan located below the coolers draws air through a
baffled inlet over the airend and motor, discharges it
across the coolers and exhausts it out the top and end of
the machine.
Lubricating Fluid System
Lubrication is provided by a pump located on the
gearbox. The gearbox also acts as the fluid reservoir and
supports the fluid cooler and fluid filter.
The fluid from the pump passes through a filter then to
the fluid galley on the top of the gearbox where it is
distributed to the gears and bearings. A fluid pressure
relief valve is located under the fluid galley cover to
maintain a specified fluid pressure.
Moisture Separator
Two combination moisture separator and water traps are
provided for collecting and removing condensate at both
the intercooler and aftercooler discharge and expelling it
to the customer’s drain.
A drain valve is located below the buffing air vents. It is
recommended that this valve be opened daily or more
often as atmospheric (high humidity) conditions require.