HeatMax II Furnace Installation and Operation Manual
49
The table below provides a very general indication of the maximum burn cycle times you
are likely to experience, based on firebox volume.
FIREBOX VOLUME
MAXIMUM
BURN TIME
<1.5 cubic feet
3 to 5 hours
1.5 c.f. to 2.0 c.f.
5 to 6 hours
2.0 c.f. to 2.5 c.f.
6 to 8 hours
2.5 c.f. to 3.0 c.f.
8 to 9 hours
>3.0 c.f.
9 to 10 hours
8.3.6 Control of the air inlet damper
Always turn the furnace on with the air inlet damper open. Once the temperature of the
wood, the combustion chamber and the chimney is stable, close the air inlet damper to
obtain a more efficient combustion.
To control the air inlet damper, use the switch on the side of the control box located at the
back of the furnace.
Reducing the combustion air will do two things. First, the combustion rate will decrease,
which will spread the thermal energy of the fuel over a longer period of time. In addition,
the velocity of the exhaust gas decreases, which allows better heat transfer in the heat
exchanger and chimney.
The closure of the main air intake reduces the intensity of the flames which indicates the
achievement of optimum performance. If the flames diminish in intensity at a point where it
almost disappears, it is an indication that the air inlet damper was closed too soon or the
firewood used is dry enough. If the wood is dry enough and the air control is closed when
the unit is at a stable temperature, the flames will decrease but remain strong and stable to
provide efficient heating.
8.4 Additional fresh air supply
When the furnace and the chimney are completely cold, it may be necessary to provide
fresh air by opening a door or a window for a few minutes while lighting the fire.
Take note that a house constructed or renovated in order to be airtight may lack the
volume of fresh air necessary for the proper combustion of a solid-fuel heating appliance.
In such a case, when starting up the fire, do not operate appliances that evacuate air
outside the house, such as:
Range hood
Air exchanger
Clothes dryer
Bathroom blower
Ventilated central vacuum system
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