Atwood AFS Series Training Manual page 47

Pilot Light Assembly
Plenum
Power Supply
FURNACE TERMINOLOGY (continued)
Terminology
Primary Air
Resonating
Return Air
Safety Lockout
Sail Switch
Secondary Air
Sensor Wire
Slope Gauge
Soot
Start Capacitor
Static Pressure
NOTE:
An assembly used to light the
burner on pilot models
A enclosure that gathers air
and redirects it to specify
locations like the box around
the combustion chamber
A source of electrical power,
usually a converter, inverter or
battery
Definition
A portion of the combustion air
directed into the main burner
A whining noise created by a
burner, air movement, blower
out of balance
Air pulled into the furnace,
heated, force through duct
outlets back to the living area
Circuit board not sensing a
flame, cutting power to the gas
valve
Air proving switch that will
engage when the blower motor
provides enough air to close
the switch.
Combustion air that is forced
around the burner to complete
combustion
Wire carrying an electrical
signal from the electrode back
to the circuit board on a remote
sense system
See incline manometer
A black powder created when
incomplete combustion occurs
normally shows at exhaust
opening
A device giving an electrical
boost to the A/C motor
during start up
Amount of pressure inside the
furnace plenum or duct caused
by the ability of not being able
Thermocouple
Thermopile
Thermostat
Time Delay Relay
Transformer
U-Tube
VOM
Volt Ohm Meter
Valve Coil
47
to dispel air from duct outlets
Safety device used to generate
an electrical current sent to the
gas valve (pilot) to hold the
valve open.
Safety device used to generate
more current than a
thermocouple to send an
electrical current to the gas
valve (pilot) to hold the valve
open
Device used with the furnace
to sense room temperature
and regulate the room air
temperature
A normally open relay, When
activated closes, sending
power to the blower motor.
When deactivated allows
blower to run for a period of
time to cool the combustion
chamber
Device reducing 120 VAC to
24 VAC
Tool measuring gas pressure
in inches of water W.C.
Meter reading voltage, OHMS
resistance
Electromagnetic coil on gas
valve used to open and close
the valve to start and stop gas
flow