I-40 Manual and Spark Ignition
Owner’s Manual • I-40
31
Air Housing
Secures safety control valve to venturi tube.
Also allows combustion air to be drawn in to
injector tube with gas
fl
ow for combustion.
Burner Orifi ces
Metering devices used to feed gas to combus-
tion cones at a speci
fi
c
fl
ow rate.
Canopy
Re
fl
ective aluminum heat shield for heater.
Double Combustion Chamber
Made of stainless steel. This is where combus-
tion of gas occurs, providing radiant heat used
in the warming process.
Gas Hose
Flexible connector used to convey gas from
gas supply line to inlet of heater.
Safety Control Valve
Safety shut off device used to feed fuel gas to
the heater combustion cones for heating. Will
shut off
fl
ow of gas completely if gas
fl
ame
is extinguished. Works in conjuction with the
thermocouple. If the thermocouple’s auto reset
temperature switch opens, the magnet internal
to the safety control valve closes, shutting off
all gas
fl
ow in the heater.
Manual Ignition Heaters
Heater Component Function
Thermocouple
Safety device that holds the electromagnet
in safety gas control valve open when heat is
applied to thermocouple tip. It will also stop
gas
fl
ow if inner combustion
fl
ame is out. The
thermocouple also includes an auto reset tem-
perature switch. This safety device will close
the safety control valve if temperature at the air
housing abnormally increases.
Thermostatic Head and Sensor
Assembly
Device used to cycle the heater and to maintain
a speci
fi
c temperature. Used on modulating
zone panels and individual control heaters only.
Venturi Tube
Tubular steel neck connecting the gas control
valve and burner ori
fi
ces to the combustion
cones. Gas is fed to the combustion cones
through the venturi tube.
