icetro IM Series, Technician'S Handbook

Page: 52 / 166

Sequence of Operation
SELF CONTAINED AIR OR WATER COOLED
NOTE: The 'ICE/OFF/WASH' switch must be in the 'ICE'
position and the water curtain must be in place on the
evaporator before the ice machine will start.
Initial Start-Up or Start-Up
After Automatic Shutdown
1. Water Fill
Water inlet valve energizes to allow the water trough to
fill, until water reaches the low-level probe on the water
sensor probe.
2. Water Flush
The dump valve and water pump are then energized to
discard the remaining water in the trough for 20 seconds.
The dump valve and water pump is de-energized and the
water inlet valve energizes a second time to allow the
water trough to fill, until water reaches the high-level
probe on the water level sensor.
3. Refrigeration System Equalization and Start-Up
The hot gas valve energizes for 10-20 seconds to allow for
pressure equalization and to reduce compressor starting
torque.
The PCB supplies control voltage to the contactor,
which energizes the compressor. At the same time, the
PCB sends power to the condenser fan motor.
NOTE: The fan motor is wired through a fan cycle
pressure control and will not cycle on until/unless the
compressor is running.
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