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NOTE: Power the internal contactors on
the low level cut-off and auxiliary low level
cut-off will remain, until the water level
drops below the LLCO probes or the power
switch is turned OFF.
4.
Manual reset switch is pressed (momentary).
A.
The auxiliary heater contactor is energized
supplying power to the heating elements
and the heat light (amber) comes on.
1)
Water in boiler heats up.
B.
Internal relay on manual reset switch is
energized.
1)
Normally open contacts close and
lock to provide power to the auxiliary
heater contactor and the heat light
after the reset switch is released.
5.
Water reaches LL (low level) probe.
A.
Power to terminal 7 on the differential
level control is present but no switching
occurs.
6.
Water reaches HL (high level) probe.
A.
Power to terminal 10 on the differential
level control.
1)
The internal contactor coil on the
differential level controls is energized.
a.
The normally closed contacts on
terminals 3 and 4 open, de-
energizing the boiler fill solenoid
and the boiler stops filling.
NOTE: The internal contactor coil has a
locking path through contacts on terminals
7 & 8 to the low level probe to keep the
coil energized after the water level drops
below the high level probe.
7.
Boiler steam pressure reaches upper limit set
point of 11 PSI. (Approximately 15 min.)
A.
Cycling pressure switch opens, heater
contactor(s) de-energize and power to the
heating elements is removed.
NOTE: Steam should not be seen entering a
compartment until the manual steam control
arm is pulled forward and locked.
8.
Boiler steam pressure drops below lower limit
set point of 9 PSI and the cycling pressure
switch closes.
A.
Boiler steam pressure is maintained by the
cycling of the pressure switch between the
upper and lower set point limits. The
cycling pressure switch continues to
energize and de-energize the heating
element contactor(s), which in turn, cycles
the heating elements on and off. This
sequence continues until one of the
following occurs:
VL SERIES STEAMER - ELECTRICAL OPERATION
Page 46 of 88
1)
Boiler pressurizes to 15 PSI, causing
the high limit pressure switch to open.
At that time, the auxiliary heating
element contactor(s) are de-
energized, shutting off power to the
heating elements. The pressure
switch will remain open until the
pressure drops below the lower limit
set point of 6 PSI. Boiler water level
drops below the LLCO (low water
level cut-off) probes for the low level
cut-off and the auxiliary low level cut-
off controls, de-energizing the internal
contactor on both controls. This de-
energizes the main and auxiliary
heater contactors, shutting off power
to the heating elements. The heating
elements will remain off until the
water level rises above the LLCO
probes and the manual re-set switch
is pressed.
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.) under
"Full Free Venting" until the compartment
temperature reaches 180°F. When the solenoid
valve energizes and closes, condensate will
continue to exhaust through a small opening
the valve under "Limited Free Venting" until the
solenoid valve de-energizes and re-opens, one
minute before the end of a cook cycle.
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.
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