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P/N 0520677_W
The high pressure switch will shut off the compressor if the high side pressure exceeds 440
psig. The control settings allow the compressor to re-start automatically up to two times, but
if the high pressure switch trips 3 times within a 30 minute period the Dixell controller must be
manually re-set by turning off the control circuit and then back on again. This is an indication
that field support is required to diagnose the problem causing the high pressure condition. The
alarm may be silenced by pressing any of the buttons on the front of the controller display.
Possible causes of high/low pressure alarm:
•
Excessive refrigerant
•
Lack of refrigerant
•
Lack of air flow into the condenser
•
Superheat too high
•
High temperatures at startup
•
Service valves closed
High and low pressure alarm will show up as the same alarm signal on the controller display.
If this alarm condition exists, the unit must be serviced by a qualified technician.
Discharge temperature alarm is an indication that the condenser is blocked and needs to be
cleaned, or remove blockage (such as balloons, paper, etc). Refer to supplemental manuals
and wiring diagrams for special options and other controllers.
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A.
Pressure Switch
Connector-2
Connector-2
wire
wire
Discharge Line Sensor
Freedom Line Reach-in
2-15
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