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Part Number 80-0111-9 6/11 179
High Pressure Cutout (HPCO) Control
QM45/Q130/Q170/Q210/Q270
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.
Specifications
Cut-out: 450 psig 10
Cut-in: Automatic reset
(Must be below 300 psig to reset).
Check Procedure
1. Set ON/OFF/WASH switch to OFF.
2. Connect manifold gauges.
3. Hook voltmeter in parallel across the HPCO,
leaving wires attached.
4. On water-cooled models, close the water service
valve to the water condenser inlet. On self-
contained air-cooled models, disconnect the fan
motor.
5. Set ON/OFF/WASH switch to ON.
6. No water or 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:
Will not reset (below 300 psig)
Does not open at the specified cut-out point
!
Warning
If discharge pressure exceeds 460 psig and the
HPCO control does not cut out, set ON/OFF/
WASH switch to OFF to stop ice machine
operation.
179


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