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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Electrical System Section 6<br />
Water Level Control Circuitry<br />
WATER LEVEL PROBE LIGHT<br />
The water level probe circuit can be monitored by<br />
watching the water level light. The water level light is on<br />
when water contacts the probe, and off when no water is<br />
in contact with the probe. The water level light functions<br />
any time power is applied to the ice machine, regardless<br />
of toggle switch position.<br />
During the freeze cycle, the water level probe is set to<br />
maintain the proper water level above the water pump<br />
housing. The water level is not adjustable. If the water<br />
level is incorrect, check the water level probe position.<br />
Reposition or replace the probe as necessary.<br />
WATER INLET VALVE SAFETY SHUT-OFF<br />
In the event of a water level probe failure, this feature<br />
limits the water inlet valve to a 6-minute on time.<br />
Regardless of the water level probe input, the control<br />
board automatically shuts off the water inlet valve if it<br />
remains on for 6 continuous minutes.<br />
FREEZE CYCLE CIRCUITRY<br />
<strong>Manitowoc</strong>’s electronic sensing circuit does not rely on<br />
float switches or timers to maintain consistent water<br />
level control. During the freeze cycle, the water inlet<br />
valve energizes (turns on) and de-energizes (turns off) in<br />
conjunction with the water level probe located in the<br />
water trough.<br />
During the first 45 seconds of the Freeze Cycle:<br />
• The water inlet valve is on when there is no water in<br />
contact with the water level probe.<br />
• The water inlet valve turns off after water contacts<br />
the water level probe for 3 continuous seconds.<br />
• The water inlet valve will cycle on and off as many<br />
times as needed to fill the water trough.<br />
After 45 seconds into the Freeze Cycle:<br />
The water inlet valve will cycle on, and then off one more<br />
time to refill the water trough. The water inlet valve is<br />
now off for the duration of the freeze sequence.<br />
HARVEST CYCLE CIRCUITRY<br />
The water level probe does not control the water inlet<br />
valve during the harvest cycle. During the harvest cycle<br />
water purge, the water inlet valve energizes and deenergizes<br />
strictly by time. The harvest water purge<br />
jumper may be set at 45 seconds (top and center<br />
terminals) or 0 seconds (center and bottom terminals).<br />
Set the harvest water purge to 0 seconds when reverse<br />
osmosis or deionized water is used. Use the factory<br />
setting of 45 seconds for all other types of water.<br />
HARVEST WATER PURGE ADJUSTMENT<br />
45 SECOND<br />
JUMPER<br />
POSITION<br />
0 SECOND<br />
JUMPER<br />
POSITION<br />
SV3139<br />
SV3140<br />
6-24 Part Number 80-1634-3
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