14 pump 16 and agitator 18 the converted d c output signal from rectifier 30 is also provided on lines 33 to the input of the main timer circuit 35 to initiate timer 36 which begins the freeze cycle with timer 36 running an output signal is produced on lines 38 which energizes led isolator 42 and triggers triac 44 to turn on the condenser fan 20 timer 36 also produces an output signal on lines 41 which is provided to the input of fixed timer 40 in the preferred embodiment timer 40 is a one minute timer so that after one minute into the freeze cycle an output signal is produced by timer 40 which energizes led isolator 58 and triggers scr 60 with scr 60 turned on the capacitance bin level control circuit 28 is effectively bypassed so that the control circuit 10 cannot be de energized in the middle of the freeze cycle even if the bin level control circuit 28 opens however should the bin level control circuit 28 open before one minute of the freeze cycle has elapsed the control circuit 10 will shut down the control circuit 10 will remain in the freeze cycle until timer 36 times out as previously explained the time period of timer 36 depends upon the resistance values of thermistors 50 and 52 which in turn vary in accordance with changes in the temperatures of the ambient air and the inlet water respectively in the preferred embodiment the following relationship between average freeze time and temperature has been selected ______________________________________ambient 38 u00b0 c 30 minutes freeze time.