Follett HCC1400W - Manual (Page 13)

13
Water system
The water level in the evaporator is controlled by a feed solenoid and level detecting sensors. Referencing the
diagram below, water sensing rods extend down into the reservoir at the end of the evaporator assembly. The
system works via electrical conductivity as follows:
One of the longest probes is a common. When water is between any of the other probes and the common, the
PC board will sense the activation. During normal operation, the water level rises and falls between the Normal
High and Normal Low sensors. As water is consumed to make ice, the level will fall until the Normal Low sensor is
exposed, triggering the water feed solenoid on. Water will fill until the Normal High sensor is activated.
Additional sensors are incorporated in the reservoir for alarm and cleaning/flushing conditions.
Note: The potable water dissolved solids content must be greater than 30 ppm for the water control system to
function properly. If using reverse osmosis water filtration system, ensure T.D.S level is greater than 30 ppm.
Alar
m HI
Alar
m LO
Nor
mal HI
Common
Nor
mal LO
Normal
operating
range
Water system diagram
Water level diagram