Water Heater Terminology - Atwood Pilot 6 Gallon User Manual

Terminology
Access Door hinged cover on outside of water
heater
By Pass Kit a combination of hoses and valves
that can aid in the winterization of
the water heater
CSA Canadian Standards Association
Calibration the condition determining whether
the thermostat is registering
temperatures properly
Cam-Loc Fastener a door securing device
Circuit Board an electronic panel that controls the
spark, solenoid valve and senses
the main burner flame
Drawn Pan metal pan attached to the water
heater tank and fastened to coach
sidewall to isolate combustion to
outside of coach
DSI direct spark ignition a.k.a.
electronic ignition
E.C.O. (energy cut off) high temperature re-set shut off
device
Electrolysis electro chemical corrosive process
that can cause pinholes in tanks
Fenwal Tester a diagnostic circuit board analyzer
Flame Spreader a round deflective piece found at
the combustion end of main burner.
Flue Box a chamber that separates air intake
and exhaust
Flue Tube combustion and water heating
surface area on inside of tank
Flying Lead flame sensing wire that is
sometimes found hard wired to
circuit board
Front of Water Heater access door side of water heater
Gas Solenoid Valve a 12 volt DC device that turns on or
off the flow of gas
Immersion Element an AC electrical heating coil that is
immersed directly into water
Inverted Flare type of connection using double
flare fitting and tube nut
Inner Tank patented, designed vessel for
heating water

Water Heater Terminology

Definition
29
Terminology
Main Burner a gas and air mixing tube
Main Burner Air Shutter the slotted sleeve on tube that
allows for gas and air adjustment
Main Burner Orifice a precision drilled fitting that
regulates the BTU's of
combustion
Mixing Valve mixes hot and cold water to a fixed
temperature 130
N.P.T. (Nat'l Pipe Thread) a plumbing measurement standard
Pilot Assembly A gas tube, orifice & thermocouple
Pilot Orifice a precision drilled thimble shaped
component that meters gas flow
to pilot.
Pilot Relight Ignition Module 12 volt electronic panel that
provides spark ignition and flame
sense to maintain pilot flame
Pressure-Temperature a pressure and temperature safety
Relief Valve device used on water heating
vessels.
Ring and Gasket retaining fiber & metal rings that
secure combustion pan to tank
Sight Glass burner flame viewing port on
access door
Spark Probe Assembly a spark electrode & flame sensing
Thermal Cut-Off heat sensing diode that cuts
power to circuit board if a flame
backs out of the burner tube or
flue tube normally caused by an
obstruction in these areas
Thermostat (gas) a temperature sensitive device for
turning on and off the flow of gas
(T-stat)
Thermostat (120 volt AC) a surface mount temperature
sensitive device that turns on/off
heating element
Thermostat (12 Volt DC) a surface mount temperature
sensitive device that turns on/off
the voltage to the circuit board
Thermocouple a device, when heated, generates
millivolts of electricity
UL Underwriters Laboratories
"U" Tube also referred to as a flue tube on
some water heater models
Winterization process of preparing a water
heater for cold winter storage
Definition
F.
°