Product Identification; Theory Of Operation - Desa RM115 Series Owner's Manual

115,000 and 155,000 Btu/Hr H.S.I. Series
PORTABLE FORCED AIR HEATERS

PRODUCT IDENTIFICATION

Hot Air
Outlet
Lower Shell
Fuel Cap
Side Cover
Ignition Control Assembly
(assembly on inside of side cover)
Figure 2

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 3 - Cross Section Operational View
Upper Shell
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.
Motor
Ignitor
Fan
Fuel
Air Line
Filter
To Burner
Air For Combustion
And Heating
FUELS
Fan Guard
Do not use heavy fuels such as No. 2 fuel oil
or No. 2 Diesel. Using heavy fuels will
Fuel Tank result in a clogged fuel filter and/or nozzle.
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.
Power Cord VENTILATION
Provide at least a three-square-foot opening
of fresh, outside air for each 100,000 Btu/Hr
rating. Provide extra fresh air if more heat-
Air Pump ers are being used.
Air Intake
Example: A 155,000 Btu/Hr heater re-
Filter
quires one of the following:
• a two-car garage door (16 feet wide
Cool
• a single-car garage door (9 feet wide
Air
In
• two 30 inch wide windows raised 12
Air
Output
Filter
Ignition Control
Assembly
Fuel
4
WARNING: Use only kerosene
or No. 1 fuel oil to avoid risk of fire
or explosion. Never use gaso-
line, naphtha, paint thinners, al-
cohol, or other highly flammable
fuels.
Follow the minimum fresh,
outside air ventilation re-
quirements. If proper fresh, out-
side air ventilation is not pro-
vided, carbon monoxide poison-
ing can occur. Provide proper
fresh, outside air ventilation be-
fore running heater.
opening) raised 4 inches
opening) raised 7 inches
inches
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