25
Heater Component Function
Air Proving Switch
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 channel gas and provide an
area at which the fuel may ignite.
Burner Orifice
Brass metering device used to feed gas to burner at a
specific rate.
Fan Housing
Chamber used for compressing 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 open allowing 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 convey 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.
Hot Surface Ignition Control Board
Electronic printed circuit board which sends and receives
voltages to various controls in an automatic hot surface
ignition system. An important safety feature of the control
board is that it will shu down the entire heater, thereby
stopping the flow of fuel gas if burner flame goes out.
Igniter
Ignition device used on automatic ignition control systems.
Ignites gas by surface temperature rather than by spark or
flame.
Motor
Electric device used to force preheated air through the
heater and to circulate heat within a certain area. Converts
electrical energy into mechanical energy.
Regulator
The heart of any gas supply installation. Used to deliver a
working pressure to the appliance under varying conditions
in tank pressure.
Sail (Flapper)
A formed piece of stainless steel located in the blower outlet
of the heater that pivots up with an increase in air pressure,
thereby engaging air flow switch.
Selector Switch
Electrical device which allows the grower to use the heater
for either heating or ventilation.
Sensor
Device used in conjunction with the ignition control board to
insure that the burner flame exists during a call for heat.
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 take higher incoming voltage and
reduce it to lower outgoing voltage to operate certain control
systems.
