Table of Contents
Advertisement
Cook Cycle
1.
A Cook cycle should not be started, until the
initial fill and preheat is completed, in order for
the boiler steam pressure to be within
operational limits.
A.
Insert product into steamer.
B.
Compartment door is closed and screw
handle tightened down.
C.
Compartment steam control arm is pulled
forward and latches, allowing steam to
enter compartment.
NOTE: Cool air and condensate exit through the
steam exhaust solenoid valve (N.O.) until
compartment temperature reaches 180°F.
D.
Time is dialed on timer (past 5 minutes).
1)
Micro switch SW1 contacts change
state from N.C. to N.O.
2)
Micro switch SW2 contacts also
change state from N.C. to N.O.
E.
Compartment power switch is turned ON.
1)
L1 (HOT) to one side of the thermal
switch.
NOTE: L2 (NEUTRAL) is connected to the other
side of the buzzer, steam exhaust solenoid valve,
trip solenoid, pilot light and timer motor.
F.
Once compartment temperature reaches
approximately 180°F thermal switch
closes and supplies power L1 (HOT) to:
1)
Steam exhaust solenoid valve (N.O.)
energized and closes.
NOTE: Even though steam exhaust solenoid valve
is closed, a small opening exists in the "guillotine"
blade of the valve to allow "limited free venting" of
condensate during a cook cycle.
2)
Pilot light (red) comes on indicating
timed cooking at 180°F has started.
3)
Timer motor energized
2.
Cooking Timer times down to approximately
one minute before zero.
A.
Micro switch SW2 contacts change state
from N.O. back to N.C. (normal starting
position).
1)
Steam exhaust solenoid valve is de-
energized and opens to exhaust
steam and pressure from the
compartment.
2)
Steam trip solenoid is energized and
unlatches steam control arm allowing
it to return to the rear. Steam supply
the compartment is shut off.
3.
Cooking timer reaches zero.
VL SERIES STEAMER - ELECTRICAL OPERATION
Page 44 of 88
A.
Micro switch SW1 contacts change state
from N.O. back to N.C. (normal starting
position)..
4.
Cooking timer is manually turned off.
5.
Compartment power switch is turned OFF,
buzzer is de-energized and power is removed
from the common side of micro switch SW1.
6.
Steamer reverts to preheat cycle until:
A.
A cooking cycle is started. i.e.
compartment door is closed and screw
handle tightened down, time is dialed into
timer (past 5 minutes) and the
compartment power switch is turned ON.
B.
Water level drops below low level cut-off
probe.
C.
Power switch is turned OFF.
NOTE: Burners will re-light after the boiler pressure
drops below the low pressure set point limit (9 psi)
and will stay on until the high pressure set point (11
psi) is reached. As long as steam pressure is within
limits, even while cooking, burners can go off. The
boiler is able to re-pressurize to the upper set point
limit even with all 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.
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 .
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 water
level control is energized, changing the
state of ILR-1 (N.O.) and ILR-2 (N.C.)
contacts.
B.
HL relay is de-energized.
Advertisement
Table of Contents
