Desa BLP375A - Manual (Page 4)

4 100416
PROPANE CONSTRUCTION HEATER
375,000 BTU/HR - A SERIES
PROPANE
SUPPLY
Propane gas and propane tank(s) are to be
furnished 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
and the Propane Installation Code CAN/
CGA B149.2. Your local library or fire de-
partment will have these booklets.
The amount of propane gas ready for use
from propane tanks varies. Two factors de-
cide 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 tanks needed to run this heater.
Do not operate this product with any tank
smaller than 100 pounds.
Temperature (
°
F) At Tank
40
°
32
°
20
°
0
°
-10
°
-20
°
Number 3 (Use larger tank below
of tanks 40
°
F)
Less gas is vaporized at lower temperatures.
You may need a larger tank in colder weather.
Your local propane gas dealer will help you
select the proper supply system. The mini-
mum surrounding air temperature rating for
each heater is -20
°
F.
Air For Combustion Air For Heating
THEORY OF OPERATION
The Fuel System: The hose/regulator
assembly attaches to the propane gas sup-
ply. The propane gas moves through the
solenoid 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.
Cool Air
In (Back)
Motor
Nozzle
Clean
Heated
Air Out
(Front)
Power
Cord
Hose/Regulator
Assembly
Solenoid
Valve
Ignitor
Combustion
Chamber
DSI
Figure 2 - Cross Section Operational View
Fan
The Ignition System: The direct spark
ignitor (DSI) sends voltage to the ignitor.
The ignitor ignites the fuel and air mixture.
The Safety Control System: This sys-
tem causes the heater to shut down if the
flame goes out. The motor will continue to
run, but no heat is produced.
VENTILATION
Provide at least three square feet of fresh,
outside air for each 100,000 Btu/Hr of rat-
ing. This heater requires a fresh air opening
of at least 11.25 square feet. Provide extra
fresh air if more heaters are being used.
WARNING: Follow the mini-
mum fresh, outside air ventila-
tion requirements. If proper fresh,
outside air ventilation is not pro-
vided, carbon monoxide poison-
ing can occur. Provide proper
fresh, outside air ventilation be-
fore running heater.