Grain Systems PNEG-634 - Manual (Page 23)

3. Installation
PNEG-634 2000 Top Dry Fan/Heater 23
Liquid Propane (LP)
Top Dry dryers have internal vaporizers and are designed to operate on liquid draw from the supply tank.
Avoid using propane supply tanks that have been used for vapor draw for long periods of time. When using
liquid draw systems, any moisture that may be present in tanks or lines may freeze when the system is
used in cold weather. To avoid this situation, purge the system with methanol.
Because the vaporizer coil may need to be adjusted during operation flexible hose suitable for LPs should
be used for the final field connection.
See the below “Fuel Systems and Recommendations Chart” for liquid propane (LP) to determine the
correct size line to run from the tank to the dryer. Have a qualified gas service person inspect the
installation to be sure that everything is installed according to local codes and ordinances.
After installation is complete, check all connections for leaks with liquid detergent or comparable.
Wear rubber gloves and eye protection. Avoid contact with liquid propane.
Figure 3P LP Line Field Connection
Fuel System Specifications and Recommendations Liquid Propane (LP)
Dryer
Fan Size
Dryer
Horsepower
Maximum Heat
Capacity
BTU per Hour
Maximum Fuel
Flow
Gallons per Hour
Minimum
Line Size Orifice
Size
Minimum
Operating
Pressure
Maximum
Operating
Pressure
28" 10-12 3 Million 32 1/2" 1/4" 1 lb. 15 lbs.
36" 15 5 Million 54 1/2" 21/64" 1 lb. 15 lbs.
40" 15 5.5 Million 60 1/2" 11/32" 1 lb. 15 lbs.
42" 30 9 Million 95 1/2" 0.328" 1 lb. 15 lbs.
42" 40 9.5 Million 104 3/4" 29/64" 1 lb. 15 lbs.
NOTICE
Do not use tanks which have previously been used for ammonia or fertilizer
solutions. These substances are extremely corrosive and will damage fuel supply
and burner parts.
WARNING
Do not use flame for leak testing.