Section II - Description
Cooling System
Water-cooled
The QSD™
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
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™
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.
10 | Quincy Compressor® - QSD™ |
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