–172–
High Pressure Cutout (HPCO) Control
FUNCTION
Stops the ice machine if subjected to excessive high-
side pressure.
The HPCO control is normally closed, and opens on a
rise in discharge pressure.
CHECK PROCEDURE
1. Set ICE/OFF/CLEAN switch to OFF.
2. Disconnect power to condensing unit.
3. Connect manifold gauges on condensing unit
access valves.
4. Hook voltmeter in parallel across the HPCO,
leaving wires attached.
5. Reconnect condensing unit.
6. Set ICE/OFF/CLEAN switch to ICE, block
condensing unit with cardboard or similar object.
7. No air flowing through the condenser will cause the
HPCO control to open because of excessive
pressure. Watch the pressure gauge and record the
cut-out pressure.
Replace the HPCO control if it:
1. Will not reset (below 300 psig).
2. Does not open at the specified cut-out point.
Specifications
Cut-Out Cut-In
450 psig ±10 Automatic Reset
(Must be below 300 psig to reset.)
If discharge pressure exceeds 460 psig and the
HPCO control does not cut out, set ICE/OFF/CLEAN
switch to OFF to stop ice machine operation.
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