Desa H.S.I. - Manual (Page 3)

112846-01A
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Lower
Shell
Side Cover
Fuel
Tank
Upper
Shell
Hot Air
Outlet Handle
Fan Guard
Air Filter
End
Cover
Fuel Cap
Power
Cord
Ignition Control
Assembly (On Inside
of Side Cover)
PRODUCT IDENTIFICATION
Figure 1 - 55/60 Models
UNPACKING
1. Remove all packing items applied to heater for shipment.
2. Remove all items from carton.
3. Check items for any shipping damage. If heater is damaged,
promptly inform dealer where you bought heater.
PRODUCT IDENTIFICATION
UNPACKING
THEORY OF OPERATION
FUELS
Thermostat Knob
(Thermostat Models Only)
Figure 2 - Cross Section Operational View
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 be lifted 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.
The Ignition System: The ignition control assembly provides
power to the ignitor. This ignites the fuel/air mixture in the combus-
tion chamber.
The Flame-Out Control System: This system causes the heater to
shut down if the flame goes out.
Clean
Heated
Air Out
Fuel
Filter Air Line
To Burner
Air
Output
Filter
Air
Pump
Air Intake
Filter
Cool
Air In
Fan
Combustion
Chamber
Ignitor
Motor
Ignition
Control
Assembly
Air For Fuel
System Air For
Combustion
And Heating Fuel
Nozzle
Fuel
Tank
FUELS
Use only kerosene, #1/#2 diesel/fuel oil, JET A or JP-8 fuels.
Heavier fuels such as No. 2 fuel oil or No. 2 diesel fuel may also be
used but will result in:
• noticeable odor
• additional fuel filter maintenance
• the need for nontoxic, anti-icer additives in very cold weather
Do not use fuels heavier than No. 2 grade or heavy oils such as oil
drained from crankcases. These heavy oils will not ignite properly
and will contaminate the heater.
IMPORTANT: Use a KEROSENE ONLY (blue) or DIESEL ONLY
(yellow) storage container. Be sure storage container is clean. For-
eign matter such as rust, dirt, or water will cause the ignition control
assembly to shut down heater. Foreign matter may also require
heater's fuel system to be frequently cleaned.
WARNING: Use only kerosene, #1/#2 diesel/fuel
oil, JET A or JP-8 fuels to avoid risk of fire or explo-
sion. Never use gasoline, oil drained from crank-
cases, naphtha, paint thinners, alcohol or other highly
flammable fuels.