The Combustion Process - Harman Stove Company Accentra Service Training

The Combustion Process

Harman pellet burners operate with a negative pressure firebox, and
a positive pressure vent system. The combustion blower is positioned
after and below the burn pot. It is blowing air out through the exhaust. The air
that is being used for combustion comes through the air intake on the
back of the stove. As the air enters the stove it is pulled through the holes
in the burn pot grate and through the burning fuel. From here the heat and
exhaust gases travel to the top of the stove and heat the heat exchanger
surfaces. After hitting the top of the firebox, the only way left to go is down.
The exhaust drops a majority of the fly-ash in the ash pan as it passes by
in route to the venting system. Understanding this air flow pattern will help
you to realize the importance of sealing the vent system, and measuring the
draft at installation. Therefore, smelling smoke means the venting is not sealed
properly.
Harman Pellet Service Training 28