DEMAND COOLING™ (Copeland)
The Demand Cooling System is designed to
inject saturated refrigerant into the suction
cavity when the compressor internal head
temperature exceeds 292˚F. Injection continues
until the temperature is reduced to 282˚F. If the
temperature remains above 310˚F for one
minute the control shuts down the compressor.
The Temperature Sensor employees a Negative
Temperature Coefficient (NTC) Thermistor to
provide signals to the Control Module. The NTC
resistance drops on temperature rise.
The Control Module responds to the
Temperature Sensor input by energizing the
Injection Valve Solenoid when 292˚F is
exceeded. Too high or too low a resistance from
the thermistor circuit will cause the Module to
shutdown the compressor after one minute.
The Injection Valve meters saturated refrigerant
into the suction cavity of the compressor.
Revised August 1, 1996 P/N 340272A
2 - 11
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 • Printed in USA
To Next Page
Loading...
