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VL SERIES STEAMER - ELECTRICAL OPERATION
Pa
g
e 44 of 88
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 ti
g
htened down.
C. Compartment steam control arm is pulled
forward and latches, allowin
g
steam to
enter compartment.
NOTE: Cool air and condensate exit throu
g
h 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 chan
g
e
state from N.C. to N.O.
2) Micro switch SW2 contacts also
chan
g
e 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 li
g
ht 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.)
ener
g
ized and closes.
NOTE: Even thou
g
h steam exhaust solenoid valve
is closed, a small openin
g
exists in the “
g
uillotine”
blade of the valve to allow “limited free ventin
g
” of
condensate durin
g
a cook cycle.
2) Pilot li
g
ht (red) comes on indicatin
g
timed cookin
g
at 180°F has started.
3) Timer motor ener
g
ized
2. Cookin
g
Timer times down to approximately
one minute before zero.
A. Micro switch SW2 contacts chan
g
e state
from N.O. back to N.C. (normal startin
g
position).
1) Steam exhaust solenoid valve is de-
ener
g
ized and opens to exhaust
steam and pressure from the
compartment.
2) Steam trip solenoid is ener
g
ized and
unlatches steam control arm allowin
g
it to return to the rear. Steam supply
the compartment is shut off.
3. Cookin
g
timer reaches zero.
A. Micro switch SW1 contacts chan
g
e state
from N.O. back to N.C. (normal startin
g
position)..
4. Cookin
g
timer is manually turned off.
5. Compartment power switch is turned OFF,
buzzer is de-ener
g
ized and power is removed
from the common side of micro switch SW1.
6. Steamer reverts to preheat cycle until:
A. A cookin
g
cycle is started. i.e.
compartment door is closed and screw
handle ti
g
htened 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-li
g
ht after the boiler pressure
drops below the low pressure set point limit (9 psi)
and will stay on until the hi
g
h pressure set point (11
psi) is reached. As lon
g
as steam pressure is within
limits, even while cookin
g
, burners can
g
o 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 ener
g
ized while cookin
g
. 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 latchin
g
relay is de-
ener
g
ized, returnin
g
ILR-1 (N.O.) and
ILR-2 (N.C.) contacts back to their
ori
g
inal state.
B. HL relay is ener
g
ized.
1) Contacts HL-3 close.
2) HL LED comes on.
3) Fill solenoid is ener
g
ized 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 switchin
g
occurs.
3. Water reaches hi
g
h level probe.
A. The inverse latchin
g
relay of the water
level control is ener
g
ized, chan
g
in
g
the
state of ILR-1 (N.O.) and ILR-2 (N.C.)
contacts.
B. HL relay is de-ener
g
ized.