Manitowoc Ice S1800 service manual High Pressure CUT-OUT Hpco Control, Function

Section 7 Refrigeration System

Pressure Control Specifications and Diagnostics

HIGH PRESSURE CUT-OUT (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.

Specifications

Cut-out:	450 psig ±10 (3103 kPa ±69, 31 Bar ±.69)
Cut-in:	Manual or automatic reset
	Must be below 300 psig (2068 kPa, 20.68
	Bar ±.69) to reset

Check Procedure

1.Set ICE/OFF/CLEAN switch to OFF.

2.Connect manifold gauges.

3.Hook voltmeter in parallel across the HPCO, leaving wires attached.

4.Close the water service valve to the water condenser inlet.

5.Set ICE/OFF/CLEAN switch to ICE.

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.

!Warning

If discharge pressure exceeds 460 psig (2068 kPa,

20.68Bar ) 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:

•Will not reset [below 300 psig (2068 kPa, 20.68 Bar )]

•Does not open at the specified cut-out point

Part Number 80-1634-3 7-19