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110098-01G
4
THEORY OF OPERATION
The Fuel System: The motor turns the fuel pump. The fuel pump pulls fuel from the fuel tank. The
fuel pump pushes fuel through a filter and a solenoid valve and out the burner head nozzle. 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.
The Ignition System: The electronic ignitor sends voltage to the spark plug. The spark plug ignites
the fuel and air mixture.
The Flame-Out Control System: This system causes the heater to shut down if the flame goes out. It
also allows the fan to continue running after normal shutdown of heater. This cools the combustion
chamber.
Figure 3 - Cross Section Operational View
Fan
Clean
Heated
Air Out
Combustion Chamber
Spark Plug
Burner
Head
Solenoid
Valve
Motor
Electronic
Ignitor
Fuel Tank
Nozzle
Fuel
Air for
Combustion
and Heating
Fuel Line To
Solenoid Valve
Fuel
Filter
Fuel Pickup
Line
Cool
Air In
Fuel Pump/
Fuel Filter
FUELS
WARNING: Use only kero-
sene or #1 fuel oil to avoid risk
of fire or explosion. Never use
gasoline, naphtha, paint thin-
ners, 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
• carbon build-up on spark plug
• the need of non-toxic anti-icer in fuel during
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 flame-out
control to shut down 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 provided, carbon monoxide
poisoning can occur. Provide
proper fresh, outside air ventila-
tion before running heater.
Fresh Air Opening Requirements
Heater Size Square Feet Opening
350,000 Btu/Hr 10.5
600,000 Btu/Hr 18.0
Note: If you use more than one heater, provide extra
fresh air. Provide a fresh air opening of at least three
square feet for each 100,000 Btu/Hr rating.