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Heater Component Function
Air Proving Switch with Paddle
Safety device used to insure that the proper air flow is being
achieved before the gas valve is opened.
Burner
Cast iron component used to mix air and gas and provide an
area at which the fuel may ignite.
Burner Orifice
Brass metering device used to supply gas to burner at a
specific rate.
Circuit Breaker
Safety device which is used to protect against an over
amperage condition which results from a direct electrical
short or an overload condition, within the 24 volt circuit.
Direct Spark Ignition Control Module
Electronic printed circuit board which sends and receives
voltages to various controls in an automatic ignition system.
An important safety feature of the control board is that it will
shut down the entire heater, thereby stopping the flow of
fuel gas if burner flame goes out.
Fan Housing
Chamber used for delivering air for efficient air movement.
Fan Wheel
Component used in conjunction with the motor and fan
housing to pull the hot air from heater and blow it into room
for heating (also known as a “squirrel cage”).
Gas Control Valve
Houses electrical solenoids which are energized by voltage
and therefore opens allowing fuel gas to pass through to
burner for ignition. The gas control valve will close, shutting
off the flow of fuel gas in the event burner flame goes out.
Gas Hose
Flexible connector used to deliver gas from supply line in
building to heater.
Heat Chamber
Metal “fire box” within the appliance that provides an area
where burner flame mixes with combustion air thereby
providing heat.
High Limit Switch
Safety device wired into the control system which is used to
break an electrical circuit to the gas control valve in event of
overheat situation.
Igniter
Ignition device used on automatic direct spark ignition
control systems. Ignites gas by spark.
Motor
Electric device used to drive a fan to pull preheated air
through the heater and to circulate heat within a certain
area. Converts electrical energy into mechanical energy.
Motor Relay
Electrical device which supplies high voltage to the motor
upon receipt of low voltage from the ignition control module.
Regulator
The heart of any gas supply installation. Used to deliver a
working gas pressure to the appliance under varying
conditions in tank pressure.
Selector Switch
Electrical device which is used to allow the end user to use
the heater in either a heating or ventilation application.
Thermostat
Electrical device used as an automatic “on/off” switch
which will respond to changes in temperature in a certain
area. Can be wired so contacts in the thermostat open or
close on temperature increase or decrease.
Transformer
Electrical control used to accept line power supply primary
voltage and reduce it to lower secondary voltage to operate
certain control systems.
