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BURNING CORN IN THE GBU070
NOTE: If your 070 was purchased as a corn unit the corn pot should already be installed.
The corn pot utilizes a lift out cast iron inner liner that removes for easy cleaning. A rod will
also be provided to lift the pot out of the furnace.
1. Your GBU070 will burn most types of clean-shelled corn. It is not necessary to mix
corn with wood pellets although some people have had better success burning a
50/50 mix.
2. Typically, burning corn requires a bit more combustion air than wood pellets. The
shutter on the draft inducer should be initially set at 50% open, the cycle time at 8
minutes and the pilot draft switch on the primary control at medium.
3. We don’t recommend direct venting when corn is the primary fuel. For corn burning,
the GBU070 needs a natural draft and this can only come from a vertical chimney.
We do recommend stainless chimney be used when corn is the fuel. Corn, by nature,
is more acidic than pellets and can eat away steel or galvanized chimney.
4. The moisture content of the corn should be 15% or less, and care should be taken to
ensure that there are no foreign objects in the corn (i.e.: sticks, stalks, cob pieces)
which will jam the feed system.
5. We recommend starting a corn fire with wood pellets as corn has a
dense shell that can be difficult to start. Place 1” of coarse oyster shell in the bottom
of the pot before using. Use a non-volatile approved fire starter to light the pellets.
6. Corn has more BTU’s than wood pellets, about 1,000 BTU’s per pound more. Thus
the furnace may have to be metered down to prevent over firing.
7. IT MAY SERIOUSLY DAMAGE YOUR POT. If you have a spare pot you can let the
used pot sit in the air for 2-3 days, the clinker will absorb moisture from the air and
become powdery, then dump the residue out. DO NOT USE ANY OBJECT TO POUND
OUT THE CLINKER. THIS WILL DAMAGE YOUR POT.
8. THERE IS NO WARRANTY ON BURN POTS. When burning corn the primary
combustion takes place on a fluidized bed at the bottom of the fire pot. A white
calcium-like deposit (clinker) will be present in the fire pot. This deposit needs to be
removed so that proper combustion can be maintained. Under heavy usage it may
be necessary to remove the clinker daily. Stir the pot with a metal stirrer and flick
out any clinker you find into the ash pan. A bit of oyster shell will be removed with
the clinker. When all the oyster shell has been removed, about 300 – 400 lbs of corn
(approx 4 – 6 days) has been burned, remove pot for a thorough cleaning and
replace with spare pot, or clean and replace used pot.
9. We recommend purchasing an extra pot to make
cleaning easier and generate less wear on your pot.
10. Turn the switch on the primary control to the draft fan position, this will allow the
remaining fuel to be burnt up and help cool down the fire pot.
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