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achieved before the timer motor begins to “time out.” When the timer motor has operated for the
preset duration, the common element is transferred to contact (4), returning the inlet solenoid valve to
the closed position and energizing the buzzer. Contact to the buzzer circuit remains closed until the dial
is manually turned to the OFF position, returning the common element (1) of the timer switch to the
neutral position.
Indicator Lights
An indicator light is included for both compartments. The light remains on (red) at all times when the
coinciding timer dial is set and the door interlock switch is closed. The light turns off at the end of the
timed cooking duration or when the set time has elapsed.
Buzzer
The buzzer is an alarm device that operates by oscillation of a striker against the core of an
electromagnet. When the 60-minute timer dials reach the “0-Minute” position, the buzzer coil is
energized to sound the buzzer. Movement of the timer dial to the OFF position opens the contact to the
buzzer coil to shut it off.
Door Interlock Switch
The interlock switch is a single-pole proximity switch with normally open contacts. The switch is
operated by the proximity of a magnet within the door. When the door is open, the switch contacts
remain in the open position. When the door is closed and securely latched in place, the magnet is near
the switch to close the contacts.
Connected between the operating contact (3) of the timers and the steam inlet solenoid valve, the door
switch acts as a protective device to interrupt valve operation unless the door is closed.
Thermostatic Switch
The thermostatically operated switch is a two-position, normally open switch mounted on the cooking
compartment. The switch functions to activate the cold water solenoid valves of the steam condensing
system and to delay timer motor operation until the compartment temperature reaches 195°F, thus
assuring that cooking temperature exists throughout the timed duration.
Digital Timers (Optional)
The timer controls the steam to the cavity by either a constant steam setting or a used defined timer
that will be programmed by the user into the timer
Kettle Switch (Optional)
The Kettle Switch will allow the user to set the mode of the steam. The user can either set the switch so
that top and bottom cavity are in use at the same time. Or the bottom cavity and a separate direct
connected kettle can be used at the same time.
Summary of Contents for ST-24
Page 24: ...22 Wiring Diagrams Figure 4 Wiring Diagram Mechanical Controls Model ST 24 ...
Page 25: ...23 Figure 5 Wiring Diagram Digital Controls Model ST 24 ...
Page 26: ...24 Figure 6 Wiring Ladder Diagram Model ST 24 ...
Page 30: ...28 ILLUSTRATED PARTS LIST Cabinet Assembly Figure 7 Cabinet Assembly ...
