Desa Air Conditioner - Manual (Page 4)

www.desatech.com 113893-01B 4
THEORY OF OPERATION
The Fuel System: The hose/regulator assembly
attaches to the propane gas supply. The propane
gas moves through the automatic control valve
and out the nozzle.
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.
Air For Combustion
And Heating Fuel
Combustion Chamber
Figure 2 - Cross Section Operational View (Heater may vary from illustration)
Clean
Heated
Air Out
(Front)
Cool
Air In
(Back)
Fan
Motor
Power Cord
Hose/Regulator
Assembly
Nozzle
The Ignition System:
The spark transformer and
spark plug lights the main burner
The Safety Control System: This system causes
the heater to shut down if the flame goes out.
Note:
Some parts are located differently on some
models.
PROPANE SUPPLY
Propane gas and propane tank(s) are to be fur-
nished by the user.
Use this heater only with a propane vapor
withdrawal supply system. See Chapter 5 of the
Standard for Storage and Handling of Liquefied
Petroleum Gas, ANSI/NFPA 58 . Your local library
or fire department will have this booklet.
The amount of propane gas ready for use from
propane tanks varies. Two factors decide this
amount:
1. The amount of propane gas in tank(s)
2. The temperature of tank(s)
The chart below shows the number of 100 pound
(45 kg) tanks needed to run this heater.
Number of tanks
Temperature Models
at tank location 55 85 125
above 20° F (-7° C) 1 1 2
20° F (-7° C) to -0 (-18° C) 1 2 3
below -0° F (-18° C) 2 2 (Use larger
tank)
Less gas is vaporized at lower temperatures. You
may need two or more 100 pound (45 kg) tanks
or one larger tank in colder weather. Your local
propane gas dealer will help you select the proper
supply system. The minimum surrounding-air tem-
perature rating for each heater is -20° F (-29° C).
INSTALLATION
WARNING: Review and un-
derstand the warnings in the
Safety Information section, page
2. They are needed to safely op-
erate this heater. Follow all local
codes when using this heater.
WARNING: Test all gas piping
and connections for leaks after
installing or servicing. Never use
an open flame to check for a leak.
Apply a mixture of liquid soap
and water to all joints. Bubbles
forming show a leak. Correct all
leaks at once.