Product Identification; Theory Of Operation - Desa and 55 Owner's Manual

PRODUCT IDENTIFICATION

Hot Air Outlet
Lower Shell
Fuel Tank
Side Cover
Ignition Control Assembly
(assembly on inside of side cover)
Figure 1 - 55,000 Btu/Hr Model Shown

THEORY OF OPERATION

The Fuel System: The air pump forces air
through the air line. The air is then pushed
through the nozzle. This air causes fuel to
lift from the tank. A fine mist of fuel is
sprayed into the combustion chamber.
The Air System: The motor turns the fan.
The fan pushes air into and around the
combustion chamber. This air is heated and
provides a stream of clean, hot air.
Combustion Chamber
Clean
Heated
Air Out
Nozzle
Fuel
Tank
Air For Fuel
System
Figure 2 - Cross Section Operational View
102388
Power Cord
The Ignition System: The ignition con-
trol assembly provides power to the ignitor.
This ignites the fuel/air mixture in the com-
bustion chamber.
The Flame-Out Control System: This
system causes the heater to shut down if the
flame goes out.
Ignitor
Fuel
Filter
Air For Combustion
And Heating
OWNER'S MANUAL
Handle
Upper Shell
Fan Guard
Air Filter
End Cover
Fuel Cap
Motor
Air Pump
Air Intake
Fan
Filter
Cool
Air In
Air
Output
Filter
Ignition
Air Line
Control
To Burner
Assembly
Fuel
3
FUELS
WARNING: Use only kerosene
or No. 1 fuel oil to avoid risk of fire
or explosion. Never use gasoline,
naphtha, paint thinners, alcohol,
or other highly flammable fuels.
Do not use heavy fuels such as No. 2 fuel oil
or No. 2 Diesel. Using heavy fuels will
result in:
• clogged fuel filter and nozzle
• the need of nontoxic anti-icer in fuel dur-
ing very cold weather
IMPORTANT: Use a KEROSENE ONLY
storage container. Be sure storage container is
clean. Foreign matter such as rust, dirt, or
water will cause the ignition control assembly
to shut down the heater. Foreign matter may
also require you to clean fuel system often.
VENTILATION
WARNING: Follow the mini-
mum fresh, outside air ventila-
tion requirements. If proper fresh,
outside air ventilation is not pro-
vided, carbon monoxide poison-
ing can occur. Provide proper
fresh, outside air ventilation be-
fore running heater.
Provide at least a two-square-foot opening
of fresh, outside air for each 55,000 Btu/Hr
rating. Provide extra fresh air if more heat-
ers are being used.
Example: A 55,000 Btu/Hr heater requires
one of the following:
• a two-car garage door (16-feet-wide
1
opening) raised 1 / inches
2
• a single-car garage door (9-feet-wide
1
opening) raised 2 / inches
2
• two windows (30-inches-wide opening)
raised 4 1 / inches
2