Vulcan-Hart VSX24D Service Manual page 39

A. Ready light (green) is lit.
B. Product is inserted into steamer.
C. Door is closed.
D. Timer is dialed on timer.
2. Contacts 1/3 of cook timer close.
A. Ready light (green) goes out.
B. Cooking light (red) comes on.
C. Timer motor is energized.
D. Compartment steam solenoid valve
energized and steam begins to enter the
compartment.
NOTE: Heating elements will come on after the
boiler pressure drops below the low pressure set
point (11 PSI) and will stay on until the high
pressure set point (13 PSI) is reached. As long as
steam pressure is within these limits, even while
cooking, heating elements can go off. The boiler is
able to re-pressurize to the upper set point, even
with both compartments in cook mode.
NOTE: The cold water condenser thermostat
remains closed and cold water condenser solenoid
stays energized while cooking. If main water is shut
off after boiler fill, then no cold water is present to
condense steam/hot water and steam vapors exit
the floor drain.
3. Time expires on timer.
A. Timer contacts 1/3 open.
B. Steam solenoid valve de-energized,
stopping the flow steam into compartment.
C. Cooking light goes out.
D. Timer contacts 4/1 close and energize
buzzer until manually turned off.
E. Ready light (green) comes on.
F. Timer motor de-energized.
4. Timer manually turned off.
A. Contacts 1/4 open
B. Alarm Buzzer de-energized and stops
buzzing.
5. Steamer reverts to preheat cycle until time is
dialed into timer and the door is shut, water
level drops below low level cut-off probe or the
power switch is turned OFF.
WATER REFILL (AFTER INITIAL FILL)
1. Water level drops below low level probe (LL).
A. Power is removed from terminal 2 on the
water level control.
VSX SERIES STEAMER - ELECTRICAL OPERATION
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1) The inverse latching relay is de-
energized, returning ILR-1 (N.O.) and
ILR-2 (N.C.) contacts back to their
original state.
B. HL relay is energized.
1) Contacts HL-3 close.
2) HL LED comes on.
3) Fill solenoid is energized and water
flows into tank.
2. Water reaches LL (low Level) probe.
A. Power to terminal 2 on the water level
control is present but no switching occurs.
3. Water reaches high level probe.
A. The inverse latching relay of the is
energized, changing the state of ILR-1
(N.O.) and ILR-2 (N.C.) contacts.
B. HL relay is de-energized.
1) HL-3 opens.
2) Fill solenoid de-energized and water
stops flowing into tank.
3) HL LED goes out.
4. The water refill cycle will occur whenever the
water level is below the low level probe and will
not affect the operation of either the preheat or
cook cycle.
BOILER BLOWDOWN/DRAIN
1. Main power switch turned OFF.
A. Boiler blowdown sequence starts.
B. The blowdown solenoid valve (N.O.) is de-
energized and valve opens to drain the
boiler.
C. Power is removed from all components
except cold water condenser (CWC)
thermostat and solenoid valve. The CWC
thermostat cycles as necessary to lower
the discharge temperature of the water
and condense steam going into the drain.