Harman PP38+ - Manual (Page 27)

3-90-08422R33_06/13
Harman pellet burning, free-standing stoves and inserts have been tested to ASTM E1509 for burning shelled corn
in a mixture with wood pellets. The listing approves up to a 50% corn and 50% pellet mixture. Different mixtures of
corn will have distinctively different burn characteristics depending upon moisture content and variety. The operator
should closely monitor the stove’s operation when burning a new corn/pellet mixture or a different variety of corn,
and make any necessary adjustments to feed rate. Since corn is typically higher in ash and moisture content, cleaning
and ash removal will be needed more frequently.
Operation in Stove Temp mode
Set feed adjuster to # 3. Set temperature knob to #3, Turn mode selector knob onto “Stove Temp” mode. After the fire
has lit, watch that the fuel does not feed too fast that it pushes the red glowing fuel bed off of the burn pot grate. If it
does, lower the feed adjuster setting or use a lower percentage of corn in the mixture. After the stove has burned for
10 minutes and the entire fuel bed is burning, the feed adjuster and temperature knobs may be adjusted for higher
heat output if desired. Maximum feed has been reached when the fire bed is about ½ to 1 inch from the end of the
burn pot. Settings will vary with different types, moisture levels and mix ratios of corn. If you are having difficulty burn-
ing a 50% corn / 50% wood pellet mixture, try a lower percentage of corn.
Operation in Room Temp mode
Set feed adjuster to # 2 or # 3. Set temperature knob to desired amount. Turn mode selector knob onto “Room Temp”
mode. After the fire has lit, watch that the fuel does not feed too fast that it pushes the red glowing fuel bed off of the
burn pot grate. After the stove has burned for 10 minutes and the entire fuel bed is burning, the feed adjuster may be
set to a higher output level if desired. Maximum feed has been reached when the fire bed is about ½ to 1 inch from
the end of the burn pot. It is recommended that after burning at the desired settings, turn the stove off and allow it to
cool, then turn it back on in “Room Temp” mode and watch the stove restart and verify correct operation. Settings will
vary with different types, moisture levels and mix ratios of corn. If you are having difficulty burning a 50% corn 50%
wood pellet mixture, try a lower percentage of corn.
Changes to Maintenance Schedule
Wood pellets average around 6% moisture content or less. Corn will be 14 or 15% moisture. With more moisture in
the fuel, more maintenance will be incurred. Burn pot scraping may need to be done once per day. The ash pan will fill
more quickly and may need emptied weekly. Most importantly, remove the burn pot cleanout cover weekly to clean
the air passage and the igniter element. Excessive buildup on the igniter may lead to shortened igniter life.
Venting Consideration: Check with your venting manufacturer regarding possible exclusions when a mixture of corn
and pellets is burned.
Addendum for Burning Corn and Pellet Fuel Mixture
Loosen these two wing screws for access
to clean the air passage and igniter.
*
For P38+ model, follow Stove Temp instructions. Keep feed rate on #3 or
above when using a wall thermostat.
2 7 PP38+ Pellet Stove