Dometic DF Series Service Manual

16
EN
Furnaces
4.5 General furnace terminology
Term Definition
AC Motor A motor operating on 120 VAC
Adjustable
Register
A heat outlet capable of being
opened and closed
Air Speed
Indicator
(Anemometer)
A tool used to measure the
velocity of air movement from a
duct outlet
Ambient Air
Temperature
Current room air temperature
Amp Draw
The amount of current required to
run a given component
Burn Off
The time it takes for the furnace
combustion chamber to burn
off all the oils and lubes used in
production
Burner
The component in the furnace
where combustion occurs,
creating the main source of heat
within the combustion chamber
Burner Flame
Li Off
When the flame lis off of the
burner
Candling
A small flame at the main burner
orifice when the valve is in a closed
position
Circuit Breaker
A normally closed switch
that automatically interrupts
an electrical circuit under an
abnormal Amp load
Circulating Air
Air drawn into the furnace by the
main air wheel then heated and
forced out the heat outlets
Combustion
Air
Air supplied to the burner
specifically for combustion
Combustion
Chamber
The component where
combustion occurs and transfers
heat to the circulating air
Converter
Component that is used to change
120 VAC to 12 VDC. Available
in linear, ferroresonant, and
switching styles
Cycling
The normal on and off operation
of the furnace as controlled by the
thermostat
DC Motor Motor operating on 12 VDC
Ignition Circuit
Board
A circuit board in the furnace
controlling the ignition sequence.
Evaluates whether a flame has
been established
Term Definition
Electrode
A conductor that establishes
an electrical spark at the burner
to ignite the air-to-gas mixture.
Senses and signals the circuit
board that a flame is established
Fan Switch
A normally open switch that
closes at a set temperature to
allow power flow to the motor.
Enables the motor to run aer the
burner shuts down to cool the
combustion chamber
Field Electrical
Hook-Up
The wiring harness that connects
the furnace to the coach wiring
Flair Fitting
Brass fitting used to connect the
furnace to the gas supply that has a
flared copper tube
Flashback
A condition created when the
flame burns back at the main
burner orifice
Flex Ducting
A round, collapsible,
wire-reinforced product used to
deliver the heated air from the
furnace to the living area
Forced
Combustion
The type of combustion created
when a second air wheel is used to
force air into the burner, increasing
the air-to-gas mixture
Gas Pressure
The amount of gas being supplied
to the furnace, measured in inches
of water column (W.C.)
Gas Valve
A mechanical device by which the
flow of gas is started or stopped by
an electrical signal
Gravity
Combustion
A type of combustion that
uses natural airflow to supply
combustion air to achieve the
proper air-to-gas mixture at the
burner
Hard Ducting
Ducting installed below the floor
line
Heat
Anticipator
Component of a thermostat that
can be adjusted to increase or
decrease the length of a heating
cycle
Heat
Exchanger
See combustion chamber
High-Tension
Lead Wire
The wire carrying the high-voltage
spark from circuit board to
electrode

Dometic DF Series Specifications

General

Brand	Dometic
Model	DF Series
Category	Furnace
Language	English