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Testing Procedures
!
Spark ignitor
Temperature responsive element
The sparking stops automatically after igniting the pilot
when the presence of flame at the end of the spark
ignitor creates a current path between ignitor and
grounded metal.
When the temperature responsive element reaches
approximately 800° F, the internal liquid pressure
causes the gas safety valve to open. When opened, the
safety valve allows gas to flow through itself, the oven
burner orifice and the oven burner where it is ignited by
the oven pilot.
The temperature sensitive bulb positioned in the oven
cavity and terminated in the internal thermostat bellows
senses heat from the oven burner flame. As oven
temperature rises to the set temperature, the oven
thermostat turns off the heater pilot, which allows the
gas safety valve to close against in coming gas
pressure. As the temperature sensitive bulb cools, the
thermostat turns on the heater pilot which allows more
gas to the oven burner. This on-off cycling continues
until the thermostat is turned off.
Important Note: The spark module will begin sparking
if the constant burning pilot is extinguished while the
thermostat is on. This will reignite the pilot.
Top Burners with Constant Burning Pilots
When a top burner valve is turned on, gas flows through
the gas valve to the burner venturi . The gas exits
through ignition port holes in the burner and out through
burner flame port holes in the burner head. The gas
exiting through the ignition port holes is lighted by the
pilot. Flames travel up the outside of the burner and
ignite gas at top of burner.
Burner
Air shutter
Venturi
WARNING
Constant pilot flame
Heater pilot flame
Flash
tube
Burner
plate
To avoid risk of electrical shock, personal injury or death,
disconnect power and gas supply before servicing,
unless testing requires it.
Flame port holes/slots
Ignition
port
holes
Flash tube
Top Burners with Spark Ignitor
Open Burners
Turning a top burner knob to LITE closes the top burner
switch, completing a 120 VAC current path to the spark
module. The spark module generates a high voltage/low
amperage DC spark which arcs to ground. The spark
ignites gas flowing through the flash tube which ignites
gas coming out of the top of the burner. Sparking
continues until the top burner knob is turned off LITE .
A top burner can be lighted during a power outage by
holding a lighted match close to the burner top and
turning top burner knob to HI .
Sealed Top Burners
Cast sealed top burners feature a cast burner cap and
cast burner base. The burner base is secured to the top
burner venturi.
Turning a top burner knob to LITE closes the top burner
switch, completing a 120 VAC current path to the spark
module.
The spark module generates a high voltage/low
amperage DC spark which runs to ground. The spark
ignites gas flowing from the top burner. Sparking
continues until the top burner knob is turned off LITE .
A top burner can be lighted during a power outage by
holding a lighted match close to the burner top and
turning top burner knob to HI .
All surface valves feature an universal orifice and an
adjustable air shutter.
39
RS2310004 Rev. 1
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