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Page 4-11
Safety Valve Closed
No Gas Flow
To Oven Burner
Safety Valve
N
L1
Low Amperage
To Oven Burner
Oven Glo-Bar
Ignitor
200˚ Heat From Oven
Thermostat Switch
Contacts Open
Oven Is Cooling
Figure 4-20
CLEANING THE OVEN BURNER
The most common burner maIfunction is clogging due to excess dirt and debris, which can enter
the burner through the burner ports. This excess dirt can block one or several of the ports so that
the burner will have trouble lighting, or will not light at all. In this case, the burner ports must be
cleared using a pin (see Figure 4-21).
The air shutter is an additional inlet where dust can enter a main burner. Whether or not the burner
is operating, dust can still be drawn into the burner through the air shutter. The debris can clog the
venturi, orifice, mixing tube, or burner ports. Again, this type of clogging can reduce, if not stop, the
flow of gas through the burner. In addition, the primary air shutter itself can become blocked,
restricting the flow of primary air into the burner.
In any event, cleaning the burner normally eliminates most of the dirt buildup. Also, it is a good
practice to keep the area immediately surrounding the main burner as clean as possible to reduce
the possibility of clogging any part of the main burner.
Oven
Burner
Air Shutter
Pin
Figure 4-21
When the thermostat senses that the selected oven temperature is reached, its internal contacts
open, as discussed earlier, and the electrical circuit is terminated (see Figure 4-20). The bimetal
cools and closes the safety valve to shut off the gas flow to the oven burner. This cycling of the
electrical system continues throughout the cooking cycle.