Safety Limits - Manitowoc S300 Technician's Handbook

Safety Limits

Safety limits are stored and indicated by the control
board after three cycles. The number of cycles
required to stop the ice machine varies for each safety
limit.
• Safety Limit 1 - If the freeze time reaches 60
minutes, the control board automatically initiates a
harvest cycle. If 6 consecutive 60-minute freeze
cycles occur, the ice machine stops
• Safety Limit 2 single evaporator models - If the
harvest time reaches 3.5 minutes, the control
board automatically returns the ice machine to the
freeze cycle. If three 500 consecutive 3.5 minute
harvest cycles occur, the ice machine stops.
• Safety Limit 2 Quad evaporator models - If the
harvest time reaches 7 minutes, the control board
automatically returns the ice machine to the freeze
cycle. If 500 consecutive 7 minute harvest cycles
occur, the ice machine stops.
• Safety Limit 3 Quad evaporator models - If the low
refrigerant pressure control opens, the ice
machine shuts off and starts a 5 minute delay
period. If 3 consecutive low pressure events occur
the ice machine stops and flashes the safety/
harvest light.
Use the following procedures to determine if the
control board contains a safety limit indication.
1. Move the toggle switch to OFF.
2. Move the toggle switch back to ICE. Watch the
safety limit/harvest lights on the control board. If a
safety limit has been recorded, the corresponding
light will flash once, twice or three times to
indicate which safety limit stopped the ice
machine.
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