Hussmann Super Plus - Demand Cooling (Copeland)

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 contin-
ues until the temperature is reduced to 282˚F.
If the temperature remains above 310˚F for
one minute the control shuts down the
c o m p r e s s o r. After correcting the cause of
shutdown, manual reset is required.
The System Parts
Temperature Sensor
Control Module
Injection Valve
The Temperature Sensor employees a
Negative Temperature Coefficient (NTC)
Thermistor to provide signals to the Control
Module. The NTC resistance drops on
temperature rise.
Temperature Approximate Ω
˚F Reading
77 90,000
282 2,420
292 2,110
310 1,660
Probe test readings between 100,000Ω and
1,600Ω usually indicate an operating probe.
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 • Printed in USA
Revised August 1, 1996 P/N 340272A
7 - 17
Demand Cooling® is
registered to Copeland
Corporation.