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exhausted steam. Valve inlet sides are connected remote from the supply line of the steam boiler (or
direct-connected steam plumbing). The valves respond to a thermostatic switch located inside the
compartment. When the timer starts the cold water solenoids will energize.
Figure 3, pictorial Diagram, Steam and Water Circuits (Model ST-24)
ELECTRICAL CIRCUITS
The electrical circuits of the cooker control the power to activate timer motors and energize solenoid-
operated valves and circuits, which in turn control application of steam to the cooking compartment and
condensation of steam from the exhaust line. The cooker operates on 120V, 2 amp, 60Hz electrical
service connected to all circuits from the circuits of the steam boiler (or direct-connected steam
controls) contained within the cabinet on which the cooker is mounted. Power is supplied to the control
circuit at all times when the shut-off device (Circuit Breaker) for the unit (installed by a certified
Electrician) is in the ON position.
Control Circuit Components
A brief description of the electrical circuit elements follows.
60 Minute Timer/Constant Steam
The timer contains a 120-volt AC synchronous motor that drives a timing dial through a gear reduction
and clutch mechanism. The timer dial is manually set for any interval of operation from 0 to 60 minutes
or constant steam as read on the calibrated dial face. The manual rotation of the dial moves the
common element (1) of the timer switch from the neutral (OFF) position to contact (3), which connects
with the steam inlet solenoid valve operating circuit.
The cooker is placed into automatic operation with the setting of the timer dial. Its timing cycle,
however, is automatically delayed by a thermostatic switch, which assures operating temperature is
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