23
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 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.
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
Electrical device consisting of a low pressure regulator and
electrical solenoids used for the control of gas flow to the
burner assembly. A feature of the control valve is a built-in
gas shut off which may be used to isolate the heater from its
gas supply when servicing.
Gas Hose
Flexible connector used to deliver gas from supply line in
building to heater.
Heat Chamber
Metal fire box 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.
Regulator
Mechanical device used in L.P. and natural gas distribution
systems to reduce a higher inlet pressure to a preset lower
pressure. The regulator is responsible to supply a steady
outlet pressure to the heater(s) despite changes in inlet
pressure, heater demand and weather conditions.
Relay
Electrical component used to deliver voltage from the
ignition control to the fan motor during initial start-up and
operation.
Reset Switch
Electrical component used for resetting the ignition control
module to restart the heater if a problem occurs.
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.
