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VL BOILER BASE SERIES CONVECTION STEAMERS - GENERAL
water in the boiler. After approximately 15 minutes,
steam should be present for cooking product. Observe
that the boiler pressure gauge indicates steam
pressure of 9-11 psi for models with a pressure
regulating valve or 4-6 psi for models without the
valve.
Regenerated Steam Powered Boiler
Open the cabinet door and turn main power switch
ON. The pilot light will illuminate, water will begin filling
the boiler and the blowdown solenoid valve will close.
Models equipped with a manual "ball type" blowdown
valve need to be closed for the boiler to fill. The boiler
should fill in approximately 15 minutes.
Observe water level gauge glass to verify that water
is in boiler and that the level in the gauge glass is about
half full.
Both valves on the gauge glass assembly must be
open to fill the gauge. When the water reaches the
minimum level, the steam solenoid valve will open,
allowing steam to enter the steam coil in the heat
exchanger tank and begin heating the water. After
approximately 20 minutes, a sufficient amount of
pressurized steam should be present for cooking
product.
Direct Steam Powered Cooker
1.
Open the cabinet door and turn main power
switch ON.
A.
The red light on the switch will illuminate.
B.
If steam pressure is above the minimum
setting on the cooking compartment
pressure switch then the switch will close,
ready light will come ON and power to the
other controls will be supplied.
C.
Observe that the steam pressure gauge in
the cabinet base indicates 10-12 psi.
2.
Steamer is ready to cook product.
Boiler Blowdown and Steamer Shut off
Turn the steamer off at least once daily and blow down
the boiler to remove sediments, scalants and lime
build-up in the boiler. Always blowdown the boiler
when it is under maximum pressure and no steam is
being used.
1.
Automatic blowdown
A.
Newer Models - Open the cabinet door and
turn main power switch OFF. The switch's
red light will go out, the blowdown/drain
solenoid valve will be deenergized and the
boiler will begin to drain. The cold water
condenser solenoid will continue to operate,
as needed, to condense steam and to cool
the water going into the drain.
B.
Older Models - Turn power switch OFF and
depress blowdown timer button. Blowdown
timer will operate for 4 minutes. At the end
of blowdown, turn fill switch ON and allow
boiler to fill.
2.
Manual blowdown
A.
All Models - Turn power switch OFF. Open
blowdown valve located on the bottom front
of the cabinet base. After the boiler has
completely drained, close blowdown valve
and turn fill switch to ON and allow boiler to
fill.
Cooking Compartment Controls
Close the compartment door and turn the screw
handle clockwise until the gasket touches the
compartment surface then ½ turn further to
adequately seal the compartment. If steam leaks
occur after compartment heat up and pressurization,
turn handle clockwise again to increase the sealing
force until the leak stops.
Proceed to the cooking compartment control
instructions that apply to the steamer in use.
1.
Manual
A.
Set the manual timer to the desired cooking
time. If preheating is desired, allow five to
ten minutes (recommended) of additional
time at the beginning of the cook cycle. The
length of time will vary with the type, size,
temperature and condition (frozen or
thawed) of the product and must be
determined from experience. Pull the steam
control arm handle forward and lock it by
pulling the handle down. This closes the
steam exhaust gate valve and opens the
steam inlet gate valve, allowing steam to
enter the compartment. During preheat,
cooler air and condensate are exhausted
from the compartment through the steam
trap (condenser) until the temperature
reaches 180°F, closing the internal bellows.
Throughout the cooking cycle, the
compartment pressure should be 6 psi if
Page 9 of 93
F24650 Rev. A (1017)
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