21
23. Fill reservoir almost to overfl owing with clean, 120 F (48.9 C) water, and drain. Repeat three times. Re-clamp pinch valve,
replace plug, and re-secure drain tube.
24. Unblock fl oat (or open water supply valve) and replace reservoir cover; restore power to ice machine and ensure compressor
switch is in ON position. Make ice for at least 15 minutes to fl ush any remaining solution from system (RIDE model ice
machines with long ice transport hoses may take longer to fl ush out). Discard this and all ice made during sanitizing.
25. Inspect evaporator drain pan and drain line and remove any accumulated scale build up.
26. Replace any panels removed prior to cleaning.
Service
Ice machine Operation
Follett’s ice machine consists of four distinct functional systems:
• Refrigeration
system
• Water
system
• Harvesting
system
• Electrical control system
These four systems work together to accomplish the production and harvesting of ice. A problem in any one of these systems will
result in improper operation of the entire ice production cycle. When troubleshooting the ice machine, it is important to analyze the
entire system operation to determine which system is not functioning properly, then pinpoint the component within that system that
is malfunctioning. Determine what corrective action must be taken before making any adjustments or replacing any components.
The icemaking process
The Follett ice machine uses a stainless steel jacketed evaporator and operates on a continuous freezing cycle. Water is supplied to the
evaporator from the water reservoir where the water level is controlled by a fl oat valve. This valve also shuts off the water supply when
the ice machine is not running.
When the ice machine is running, a layer of ice
forms on the interior surface of the evaporator.
This ice is continuously removed by a slowly
rotating (12 RPM) auger. The auger carries the
ice upward into the cavity formed by the top
bearing housing and the compression loop,
where it is compressed to remove excess water.
When the ice reaches the desired hardness it
rotates within the cavity and is forced through
a discharge port and compression nozzle and
into the ice transport tube. The discharge tube
and compression nozzle are slightly restricted
to further compress the ice and produce the
desired hardness. As the formation of ice
continues, ice in the transport tube is pushed
through the tube to the storage compartment in
the ice dispenser or ice storage bin.
A solid state control board located in the
electrical box of the ice machine controls
the normal operation of the ice machine and
monitors gearmotor torque. This control board
will shut down the ice machine should an over-
torque condition occur. It is very important that
you familiarize yourself with the operational
sequences detailed in this manual before
attempting to service the ice machine.
evaporator
port
ice transport tube
compression nozzle
auger
water
inlet
Harvest system diagram
