Manitowoc CNF201A, Technician'S Handbook

Page: 82 / 116

82 Part Number 000015432 4/18
HIGH PRESSURE CUTOUT 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.
Specifications
Cut-Out Cut-In
450 psig ±10
(3103 kPa ±69)
31 bar ±.69
Automatic Reset
(Must be below 300 psig
[2068 kPa 20.68 bar] to reset.)
CHECK PROCEDURE
1. Set ICE/OFF/CLEAN switch to OFF, (Manual reset
HPCO reset if tripped).
2. Disconnect main power supply to the ice machine.
3. Connect manifold gauges to the access valves.
4. Hook voltmeter in parallel across the HPCO, leaving
wires attached.
5. Reconnect main power supply to the ice machine.
6. Set ICE/OFF/CLEAN switch to ICE.
7. 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.
n
Warning
If discharge pressure exceeds 460 psig (3172 kPa
31.72 bar) and the HPCO control does not cut out,
set ICE/OFF/CLEAN switch to OFF to stop ice machine
operation.
Replace the HPCO control if it:
1. Will not reset (below 300 psig [2068 kPa 20.68 bar]).
2. Does not open at the specified cut-out point.