Vogt HEC-10, Service Manual

Page: 54 / 114

HEC-Series Service Manual
ELECTRICAL CONTROLS & THEIR FUNCTIONS
10/21/01
6-8
Standby Mode. The standby mode is a decision making mode. It monitors the position of all the
various switches in the control circuitry and at the proper time decides which mode to advance to
next.
Initiated by the following action:
1. After the two hour period in the start-up mode.
2. After pushing the “Start” button.
3. After pushing the “Ice” button to the “Off” (and the harvest cycle and partial pumpdown cycles
are complete).
4. After the bin thermostat contact opens (and the harvest cycle and partial pumpdown cycles are
complete).
Freeze Mode (Freeze Cycle). The freeze mode is active during the normal ice making cycle. During
this time, the circulating water pump and compressor are running and the “A” (liquid feed) solenoid
valve and “X” solenoid valve compressor discharge (AC units only) are open.
Initiated by the following:
1. After the start-up and standby modes are satisfied in sequence.
2. At the termination of the harvest mode.
Harvest Mode (Thaw Cycle). The harvest mode is normally initiated at the termination of the freeze
mode. At this time, the circulating water pump stops and the “A” (liquid feed) solenoid valve closes
for a time period of seven seconds. After seven seconds, the “D” (thaw gas) solenoid valve opens,
the cutter motor starts and the thaw timer is activated.
Initiated by the following:
1. Action of the freezer pressure switch.
2. Pushing the manual harvest button.
The harvest mode is terminated by the thaw (harvest) timer at which time the machine will begin
another freeze cycle. If the “Ice” switch is “Off” or the bin thermostat is satisfied the machine will
advance through the partial pumpdown mode then standby. The harvest mode can be terminated
manually by pushing in the “Start” button. The machine will end the harvest and start a freeze or go
to standby if the “Ice” switch is “Off”.