Manitowoc EC18, Technician'S Handbook

Page: 83 / 184

70 Part Number 80-1479-3 10/10
S.C.R. TIMER
Silicon Rectifier (S.C.R.) Switch
Function
Extends the length of the freeze cycle (after the
evaporator thermostat closes), initiates and terminates
the harvest cycle.
Settings
Dom (delay on make) dial indicates minutes and
determines the additional length of freeze time after
the evaporator thermostat closes. Factory setting is 11
minutes
SS (single shot time) dial indicates minutes and
determines the length of the harvest cycle. Factory
setting is 3 minutes.
NOTE:
The evaporator thermostat must open the
trigger contact (#6) to reset the freeze cycle time. If
power is not broken at terminal #6 the ice machine will
remain in the freeze cycle and never initiate a harvest
cycle
Operation

Total freeze cycle time = the time it takes to close
the evaporator thermostat plus 10 minutes.

Total harvest time = the setting on the timer SS dial.
DURING THE FREEZE CYCLE
After the evaporator thermostat closes, the timer is
supplied with power. The ice machine remains in
freeze until the timer reaches the setpoint time.
Contacts 6 & NO (normally open) on the timer close to
supply power to the hot gas and water inlet valves.
DURING THE HARVEST CYCLE
The ice machine remains in harvest until the timer
reaches the setpoint time.