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7.12 Components Description of Operation
a) Drain solenoid – When the return valve is opened, a microswitch activates and supplies
24V to the pump relay and solenoids.
b) Vacuum release solenoid – When the return valve is closed, it de-energizes the 24V to
the pump relay and solenoids releasing the vacuum.
c) Full vat oil return switch –When the return valve is open, the 24V circuit is closed and
it activates the pump relay and drain solenoid.
d) Dual vat oil return switch – When the return valve is open, the 24V circuit is closed and
it activates the pump relay and drain solenoid.
e) Optional waste oil pump switch – The drain valves and oil return valves are closed.
When the oil waste discharge valve is opened, the
24V circuit is closed, it activates the pump relay and
drain solenoid.
f) Safety interlock switch – The interlock switch is in series with the high-limit. It is
actuated when the drain valve opens, which opens the latch
circuit which drops out the 12V circuit on the interface board.
This removes power from the latching contactor which opens
and de-energizes the heating elements.