Water System - Follett MCD425A/W Operation And Service Manual

Water system

The water level in the evaporator is controlled by a fill solenoid (Fig 1) and level detecting sensors . Water sensing
rods (Fig. 2) 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 .
Note: The potable water dissolved solids content must be greater than 10 ppm for the water control system to
function properly . If using reverse osmosis water filtration system, ensure T .D .S level is greater than 10 ppm .
Fig. 1 Water system diagram
VENT
ICE
NOZZLE
DRAIN PAN
DRAIN
Fig. 2 Water level diagram
A ALARM LOW (RED)
B COMMON (BLACK)
C NORMAL HIGH (ORANGE)
D NORMAL LOW (YELLOW)
10 MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines
CLEANING CUP
WATER
RESERVOIR
C
NORMAL OPERATING RANGE
D
A
B
RESERVOIR FILL
SOLENOID
WATER SUPPLY
3/8" FPT, 45-90 F (7-32 C)
10-70 PSI (69-483 KPA)
WASTE WATER DRAIN
3/4" FPT
B
A
D
C
D
C
B
A