Manitowoc EC18, Technician'S Handbook

Page: 85 / 184

72 Part Number 80-1479-3 10/10
HIGH PRESSURE CUTOUT (HPCO) CONTROL
Water Cooled Only
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: 20.7 Bar (300 psig)
Cut-in: 10.3 Bar (150 psig)
(Must be below ± .7 Bar, ± 10 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. Close the valve to the water condenser inlet.
5. Set ON/OFF/WASH switch to ON.
6. No water 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 10.3 Bar [150 psig])

Does not open at the specified cut-out point
! Warning
If discharge pressure exceeds 21.4 Bar (310 psig)
and the HPCO control does not cut out, set ON/
OFF/WASH switch to OFF to stop ice machine
operation.