Water Level Control Circuitry - Manitowoc QuietQube Indigo Series Technician's Handbook

WATER LEVEL CONTROL CIRCUITRY

FUNCTION
The water level probe controls the water level by
sensing whether water is or is not contacting the water
level probe. The water level probe has three sensing
probes. Two probes are equal in length and are used
to measures conductivity for diagnostics, ice clarity
and water miser options. Factory default settings
measure resistance from both long probes to the short
probe.
SPECIFICATIONS
Freeze Cycle Water Level Setting
During the Freeze cycle, the water level probe is set to
maintain the proper water level above the water pump
housing. The water level is not adjustable. If the water
level is incorrect, check the water level probe position.
Reposition or replace the probe as necessary.
Water Inlet Valve Safety Shut-Off
In the event of a water level probe failure, this feature
limits the water inlet valve to a six-minute on time (8
minutes for dual evaporator models). Regardless of
the water level probe input, the control board
automatically shuts off the water inlet valve when the
time limit is exceeded.
Freeze Cycle Operation
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 probes.
• The water inlet valve turns OFF after water
contacts the water level probes for 3 continuous
seconds.
• The water inlet valve will cycle ON and OFF once
in pre-chill and up to 2 times in the freeze cycle.
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 cycle.
Part Number STH026 2/12 173