11
Heater Selection
Determine the Right Size Fan for Your Bin Size First
Warning!
Determining the correct size fan for the size of the bin, type of grain and needs, is the key to
successful drying. Your heater selection only needs to match your fan size, fuel source at hand, and type of heater
controls desired.
Responsibility for the Grain Condition is Yours!
Warning!
Incorrect fan size will cause your heater to not preform to your expectations. Too much static pressure
is the leading cause of poor heat, burnt wiring in the chamber, and may cause your chamber to burn up. Oversized
fans for a bin will cause as much damage as undersize.
Note:
Provide one square foot roof opening per thousand cfm fan capacity.
Fuel Source:
Ultra low temp heater will use
vapor propane
. For LP fuel line, use 5/8” OD type K copper tubing
or ½” schedule 80 black steel pipe. Use 3-5 foot of flexible LP hose between fuel line and heater. Before
connecting to heater, purge gas line to blow out any dirt in pipe. When using vapor heater, connect at regulator.
LPG Tank Size (gallons) for Vapor Withdrawal*
BTU/HR**
LOWEST AVERAGE 24-HR OUTDOOR TEMPERATURE (F)
32
20
10
0
-10
-20
-30
125,000
115
115
115
250
250
400
600
250,000
250
25
250
400
500
1000
1500
375,000
300
400
500
500
1000
1500
2500
500,000
400
500
750
1000
1200
2000
3500
750,000
750
1000
1500
2000
2500
4000
5000
Source: LP Gas Handbook of Technical Data (Fisher Controls Co.)
*Tank is assumed to be half full
** Average rate in 8hr period.
