MCD425ABT Installation, Operation and Service Manual

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Water system

The water level in the evaporator is controlled by a ll 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 ll 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 ltration system, ensure T.D.S level is greater than 10 ppm.

Fig. 1 Water system diagram

CLEANING CUP

WATER SUPPLY

3/8" FPT, 45-90 F (7-32 C)

10-70 PSI (69-483 KPA)

RESERVOIR FILL

SOLENOID

WASTE WATER DRAIN

3/4" FPT

WATER

RESERVOIR

EVAPORATOR

ICE

NOZZLE

DRAIN PAN

VENT

DRAIN

Fig. 2 Water level diagram

NORMAL OPERATING RANGE

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

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Follett MCD425ABT 23" Maestro Plus Series Air Condenser Ice Machine