Grain Systems PNEG-1891 - Manual (Page 51)

8
Fuel Supply
Topics Covered in this Chapter
▪ Guidelines for Connecting a Liquid Propane Supply Tank to a Dryer
▪ Specifications and Recommendations for Liquid Propane
▪ Guidelines for Connecting Natural Gas to a Dryer
▪ Specifications and Recommendations for Natural Gas
Guidelines for Connecting a Liquid Propane Supply Tank to a Dryer
When initially installing the dryer, you must connect a fuel source before you can operate the dryer. Liquid
propane (LP) is one of the fuel sources you can use to fuel your dryer.
The dryers have internal vaporizers and are designed to operate on liquid draw from the supply tank. Con-
sult your liquid propane gas dealer for proper fittings, connection hose, and safety controls that are
required to meet local standards and conform with the National Fire Protection Association standards. The
piping train on the dryer includes the strainer, pressure relief valve, electronic safety shutoff valve (on
some models), and a pressure regulator between the vaporizer and the burner.
CAUTION
When long gas lines are installed between the liquid propane fuel tank and the dryer,
the fuel can vaporize in the fuel lines causing the vaporizer to over heat.
CAUTION
Do not use tanks that have previously been used for ammonia or fertilizer solutions.
These substances are extremely corrosive and can damage fuel supply and burner
parts.
CAUTION
As a result of liquid draw from the supply tank, any water or oil present in the tank
can freeze in the pipe train or the controls and cause damage. To make sure that the
tank is free of moisture, it can be purged with methanol. Avoid tanks containing an
accumulation of oil or heavy hydrocarbon, resulting from extensive use on a vapor withdrawal
system.
Guidelines for connecting the liquid propane fuel tank to the dryer:
• Verify that the tank is 1000 gallons or larger and does not have a regulator mounted to it.
• Connect a flexible hose that is designed for liquid propane gas to supply tank. See Table 8-1, page
52 to determine the correct size of fuel line and heater orifice to use for your installation.
• Consult your liquid propane gas dealer for correct fittings, connection hoses, and safety controls that
are required to meet all local and national code standards.
• Connect a liquid propane flexible hose to the manifold on the dryer.
• Open the liquid propane shutoff valves slowly to prevent accidental closing of the excess flow valves.
Pneg-1891 Portable Dryers 51