Manitowoc SD0672C, Technician'S Handbook, Page: 188 / 298

188 Part Number 80-1505-3 6/11
FREEZE CYCLE CIRCUITRY
Manitowoc’s electronic sensing circuit does not rely on
float switches or timers to maintain consistent water
level control. During the Freeze cycle, the water inlet
valve energizes and de-energizes in conjunction with
the water level probe located in the water trough.
During the first 45 seconds of the Freeze cycle:
The water inlet valve is ON when there is no water in
contact with the water level probe.
• The water inlet valve turns OFF after water
contacts the water level probe for 3 continuous
seconds.
• The water inlet valve will cycle ON and OFF as
many times as needed to fill the water trough.
After 45 seconds into the Freeze cycle:
The water inlet valve will cycle ON, and then OFF one
more time to refill the water trough. The water inlet
valve is now OFF for the duration of the Freeze
sequence.
HARVEST CYCLE CIRCUITRY
The water level probe does not control the water inlet
valve during the harvest cycle. During the harvest
cycle water purge, the water inlet valve energizes and
de-energizes strictly by time. The harvest water purge
jumper may be set at 45 seconds (top and center
terminals) or 0 seconds (center and bottom terminals).
Set the harvest water purge to 0 seconds when
reverse osmosis or deionized water is used. Use the
factory setting of 45 seconds for all other types of
water.
45 SECOND
JUMPER
POSITION
0 SECOND
JUMPER
POSITION
HARVEST WATER PURGE ADJUSTMENT