www.desatech.com
118997-01B
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 2 - 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
350,000 Btu/Hr
10.5 ft
2
Opening
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.
