Manitowoc Ice S1800 service manual Section Refrigeration System

Section 7 Refrigeration System

Safety Limit #2

Refer to page 7-11 for safety limit operation.

Harvest time exceeds 3.5 minutes for 500 consecutive harvest cycles.

Possible Cause	Check/Correct
Improper installation	See “Installation/Visual Inspection Checklist”
Water system	Water area (evaporator) dirty
	Dirty/defective water dump valve
	Vent tube not installed on water outlet drain
	Water freezing behind evaporator
	Plastic extrusions and gaskets not securely mounted to the
	evaporator
	Low water pressure [20 psi (138 kPa) min.]
	Loss of water from sump area
	Clogged water distribution tube
	Dirty/defective water fill valve
	Defective water pump
Electrical system	Ice thickness probe out of adjustment
	Ice thickness probe dirty
	Bin switch defective
	Premature harvest
Refrigeration system	Non-Manitowoc components
	Water regulating valve dirty/defective
	Improper refrigerant charge
	Defective harvest valve
	TXV flooding (check bulb mounting)

SAFETY LIMIT NOTES

•Because there are many possible external problems, do not limit your diagnosis to only the items listed in this chart.

•A continuous run of 100 harvests automatically erases the safety limit code.

•The control board will store and indicate only one safety limit – the last one exceeded.

•If the toggle switch is moved to the OFF position and then back to the ICE position prior to reaching the 100-harvest point, the last safety limit exceeded will be indicated.

•If a Safety Limit light did not flash prior to the ice machine restarting, then the ice machine did not stop because it exceeded a safety limit.

Part Number 80-1634-3 7-11