L.B. White 100 Tradesman Portable Forced Air - Manual (Page 21)

Heater Component Function
Backflash Switch
Safety device which is used to break an electrical circuit in
the event of an overheat condition.
Burner Orifice
Brass metering device used to feed gas at a specific rate.
Direct Spark Ignition Control Board
Electronic control board which supplies a steady voltage in
turn creating a constant spark to ignite the burner gas.
Fan Blade
Component used in conjunction with fan motor to pull in air
for combustion and circulate for heating.
Gas Hose
Flexible connector used to convey gas from the fuel supply to
the heater.
Igniter
Electronic ignition device used on automatic spark ignition
control systems. Ignites gas by spark.
Motor
Converts electrical energy into mechanical energy. It is used
in conjunction with the fan blade to pull air into the burner
for combustion and to circulate the air for heating purposes.
Relay
Electrical device used to prove the thermocouple circuit for
flame safety.
Safety Gas Control Valve
An electromagnetic gas control valve which is held open by
electrical current supplied by a thermocouple and which
closes automatically to shut off the gas flow if the current
generated by the thermocouple becomes too weak.
Thermocouple
A thermoelectric device that converts heat energy directly
into electrical energy. It works in conjunction with the
electromagnet in the gas control valve in providing gas to
the main burner.
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