S1800 Marine Model Ice Machines – Service Manual - Manitowoc Ice
S1800 Marine Model Ice Machines – Service Manual - Manitowoc Ice
S1800 Marine Model Ice Machines – Service Manual - Manitowoc Ice
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Section 7 Refrigeration System<br />
Pressure Control Specifications and Diagnostics<br />
HIGH PRESSURE CUT-OUT (HPCO) CONTROL<br />
Function<br />
Stops the ice machine if subjected to excessive highside<br />
pressure.<br />
The HPCO control is normally closed, and opens on a<br />
rise in discharge pressure.<br />
Specifications<br />
Cut-out: 450 psig ±10 (3103 kPa ±69, 31 Bar ±.69)<br />
Cut-in: <strong>Manual</strong> or automatic reset<br />
Must be below 300 psig (2068 kPa, 20.68<br />
Bar ±.69) to reset<br />
Check Procedure<br />
1. Set ICE/OFF/CLEAN switch to OFF.<br />
2. Connect manifold gauges.<br />
3. Hook voltmeter in parallel across the HPCO, leaving<br />
wires attached.<br />
4. Close the water service valve to the water<br />
condenser inlet.<br />
5. Set ICE/OFF/CLEAN switch to ICE.<br />
6. No water flowing through the condenser will cause<br />
the HPCO control to open because of excessive<br />
pressure. Watch the pressure gauge and record the<br />
cut-out pressure.<br />
! Warning<br />
If discharge pressure exceeds 460 psig (2068 kPa,<br />
20.68 Bar ) and the HPCO control does not cut out,<br />
set ICE/OFF/CLEAN switch to OFF to stop ice<br />
machine operation.<br />
Replace the HPCO control if it:<br />
• Will not reset [below 300 psig (2068 kPa, 20.68 Bar )]<br />
• Does not open at the specified cut-out point<br />
Part Number 80-1634-3 7-19
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