Using a small piece of wire jump the Sensor
circuit at the female plug in the Module.
Restart the system. There should be v o l t a g e
between terminals “S” and “L2” on the
Module. The outlet side of the Injection Valve
should feel colder than the inlet side. A f t e r
one minute the alarm relay should trip.
Remove power to the system. Press the manu-
al reset on the Module.
Remove the jumper wire and plug in the
Temperature Sensor.
Restart the System.
Alarm Circuit
The Alarm Circuit has three terminals in the
Control Module.
“L” —Common
“M” —Normally Closed
“A” —Normally Open
“L” and “M” are wired into the compressor
control circuit so an alarm condition removes
the compressor from the line and power to the
Module. A manual reset is required to call
attention the alarm condition.
Alarm Relay
The Alarm Relay is activated after a one
minute delay under the following three condi-
tions:
1. Compressor discharge temperature
exceeds 310˚F.
2. A shorted circuit or very low T h e r m i s t o r
Resistance.
3. An open circuit or very high T h e r m i s t o r
Resistance.
Operational Notes
Demand Cooling does N O T replace head
cooling fans which are still required on low
temperature applications.
Temperature Sensor cable must not touch any
hot surfaces or the cable will be damaged.
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 • Printed in USA
Revised August 1, 1996 P/N 340272A
7 - 19
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