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 refriger-
ant into the suction cavity of the compressor.
The valve orifice is carefully sized to meet the
requirements of a specific compressor. Va l v e
sizes correspond to the four compressor bod-
ies—2D, 3D, 4D, 6D.
Component Testing
Remove power to the system. Unplug the
Temperature Sensor from the Module. T h e
Sensor should ohm out between 1,600Ω and
100,000Ω.
Leave the Sensor unplugged and restart the
system. There should be n o voltage between
terminals “S” and “L2” on the Module. T h e
inlet and outlet sides of the Injection Va l v e
should feel the same temperature. After one
minute the alarm relay should trip. Remove
power to the system. Press the manual reset
on the Module.
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 • Printed in USA
CONTROLVALVES Revised August 1, 1996
7 - 18
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