Market Forge Industries 3500 owner manual Buzzer, Thermostatic Switch, Door Interlock Switch

PRINCIPLES OF OPERATION

Fig. 2 Pictorial Diagram, Steam and Water Circuits

INDICATOR LIGHTS:by the proximity of a magnet within the door. When An indicator light is included for both compartments. the door is open, the switch contacts remain in the

The light remains on (red) at all times when the co-	open position. When the door is closed and secure-
inciding timer dial is set and the door interlock switch	ly latched in place, the magnet is near the switch to
is closed. The light turns off at the end of the timed	close the contacts. Connected between the operating
cooking duration.	contact (3) of the timers and the steam inlet solenoid
BUZZER:	valve, the door switch acts as a protective device to
	interrupt valve operation unless the door is closed.
The buzzer is an alarm device that operates by oscil-
lation of a striker against the core of an electromag-	THERMOSTATIC SWITCH:
net. When the 60 minute timer dials reach the “0 Min-	The thermostatically operated switch is a two-posi-
ute” position, the buzzer coil is energized to sound	tion, normally open switch mounted on the cooking
the buzzer. Movement of the timer dial to the OFF	compartment. The switch functions to activate the
position opens the contact to the buzzer coil to shut	cold water solenoid valves of the steam condensing
it off.	system and to delay timer motor operation until the
DOOR INTERLOCK SWITCH:	compartment temperature reaches 195°F, thus as-
	suring that cooking temperature exists throughout the
The interlock switch is a single-pole proximity switch	timed duration.
with normally open contacts. The switch is operated

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