Heatmax Furnace Installation and Operation Manual
34
6.4 Chimney and draft
This furnace must be connected to a chimney certified for wood burning heating
appliances; a 6” connector and chimney is mandatory. The barometric damper must be
adjusted so that the maximum draft measured at the furnace outlet is limited to -0.06 in.
w.c. However, the minimum draft to be respected at all times is -0.04 in. w.c. in the
evacuation pipe.
If the chimney draft exceeds -0.06" w.c, a barometric draft control should be installed on
the smoke pipe. Never install a manual damper.
The barometric control must be adjusted so that the maximum draft measured at the
furnace outlet does not exceed -0.06" w.c. Please note that a draft exceeding -0.06" w.c.
will reduce the efficiency and could produce an uncontrollable fire. On the other hand,
the minimum draft required is 0.04" w.c. in the evacuation pipe on the wood side, no
matter what type of furnace.
CAUTION: BEFORE THE CONNECTOR PIPES ARE INSTALLED, MAKE SURE THAT
THE EXHAUST PIPE AND / OR THE EXCHANGERS OF THE FURNACE ARE FREE OF
ALL ITEMS.
WARNING: AN EXCESSIVE DRAFT MAY CAUSE OVERHEATING AND MAKE THE
CONTROL OF THE FIRE DIFFICULT.
6.5 Combustion air
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.
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