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The top half of the steamer consists of two to three separate cooking compartments depending on the model.
Each compartment functions independently with its own set of controls. Power is supplied to the controls through
the compartment power switch and the cooking timer control micro switch contacts. Prevent and Automatic
models have a load compensating thermal switch that prevents the controls from receiving power until the
compartment reaches 180°F to close the switch.
Compartment Power Switch . . . . . . Supplies power to the cooking compartment controls.
Cooking Light (Red) . . . . . . . . . . . . When lit, indicates steamer is in a cooking cycle. (All models except
Cooking Timer . . . . . . . . . . . . . . . . . Use to set desired cooking cycle time between 0-60 minutes. Energizes
Buzzer . . . . . . . . . . . . . . . . . . . . . . . Signals end of a cook cycle, must be turned off manually. (All models
Steam Exhaust Solenoid Valve . . . A normally open valve that allows full compartment venting of air and
Steam Header Inlet (manifold) . . . . Main steam supply line from the boiler for each cooking compartment.
Compartment Pressure Gauge . . . . Indicates the amount of steam pressure in cooking compartments.
Steam Control Arm Solenoid . . . . . When energized, engages the lift arm (plunger) to raise the steam
Thermal Switch
(Load Compensator) . . . . . . . . . . . . Controls power to the preheat cycle components. Turns the cooking light
Steam Gate Valves . . . . . . . . . . . . . Manual valves actuated by the steam control arm. Allows steam to flow
Steam Trap (Condenser) . . . . . . . . . Exhausts air and condensate from compartment during preheat until the
VL SERIES STEAMERS - GENERAL
COOKING COMPARTMENT CONTROLS
manual)
the buzzer when time expires (All models except manual). On Prevent
models, also de-energizes the steam exhaust solenoid valve one minute
before the end of a cook cycle to allow compartment venting.
except manual)
condensate up to 180°F during compartment heat up and "limited free
venting" after energized by the closing of the thermal switch. The valve
remains closed to allow compartment pressurization to 6 psi until one
minute before the end of a cook cycle at which point the timer control
micro switch contacts (SW2) change state and de-energize the valve to
vent the compartment of pressure and steam. (prevent models)
Supplies steam to the manual steam gate valves.
control arm off of the catch, allowing it to return to its rear position. This
closes the steam inlet gate valve and opens the steam exhaust gate
valve. (prevent, automatic and standard models)
on, energizes the steam exhaust solenoid valve and energizes the
cooking timer motor to start timing, after the compartment reaches
180 F. (prevent and automatic models)
into the cooking compartment through the inlet steam gate valve when
the arm is in a forward position and exhaust the steam through the
exhaust steam gate valve when the arm is at the rear. Prevent models
use a steam exhaust solenoid valve to exhaust the steam and a single
steam gate valve as the steam inlet. The automatic, standard and
manual models use one steam gate valve to exhaust the steam and
one additional steam gate valve as the steam inlet.
compartment temperature reaches approximately 180 F. The bellows
then close, stopping the exhaust. (all models except prevent)
Page 13 of 88
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