Desa 4E769B operating instructions Theory of Operation, Propane Supply

Dayton Operating Instructions and Parts Manual

Model 4E769B

Theory of Operation

THE FUEL SYSTEM

The hose/regulator assembly attaches to the propane gas supply. This provides fuel to the heater.

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 (Front)

THE IGNITION SYSTEM

The piezo ignitor lights the burner.

THE AUTOMATIC CONTROL SYSTEM

This system causes the heater to shut down if the flame goes out.

Fan

Motor

Cool Air

In (Back)

Propane Supply

Propane gas and propane tank(s) must to provided by the customer.

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)

This heater is designed to operate with

aminimum 20-pound propane tank. You may need two or more tanks or one larger tank in colder weather. Use a 100-pound tank for longer operation or in very cold weather. Less gas is vaporized at lower temperatures. Your local propane gas dealer will help you select the proper supply system. The

minimum surrounding air temperature rating for each heater is -20°F (-29°C).

	Average Temperature	Number of Tanks
	(oF) at Tank Location	(100 pound)
	40°	1
Hose/Regulator Assembly	32°	1
	20°	1
Air For Combustion	Air For Heating	1
	10°

0°1

-10°2

-20°2

Figure 3 - Cross Section Operational View

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Version B - For Reduction G016.J