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Do not expect a furnace to draw. It is the
chimney that creates the draft. Smoke spill-
age into the house or excessive build-up of
water or creosote in the chimney are warn-
ings that the chimney is not functioning
properly. Correct the problem before using
furnace. Possible causes are:
1. The connector pipe may be pushed into the
chimney too far, stopping the draft.
2. Do not connect two furnaces or a stove and
furnace into the same chimney flue.
3. The chimney used for a furnace must not
be used to ventilate the cellar or basement.
If there is a cleanout opening at the base of
the chimney, it must be closed tightly.
A draft reading of .05 to .06 w.c. is suggested for proper burning of this unit when us-
ing wood or bituminous coal as fuel. When using anthracite coal, this draft reading is a
Chimney Maintenance
Creosote and Soot - Formation and Need for Removal
When wood is burned slowly, it produces tar and
other organic vapors, which combine with expelled
moisture to form creosote. The creosote vapors
condense in the relatively cool chimney flue of a
slow-burning fire. As a result, creosote residue
accumulates on the flue lining. When ignited, this
creosote makes an extremely hot fire.
When coal is burned, the products of combustion
combine with moisture to form a soot residue which
accumulates on the flue lining. When ignited, this
soot makes an extremely hot fire.
The chimney should be inspected at least twice
monthly during the heating season to determine
if a creosote or soot build up has occurred.
If creosote or soot has accumulated, it should be
removed to reduce the risk of a chimney fire.
Chimney fires burn very hot. If the chimney
catches fire, immediately call the fire department,
then reduce the fire by closing the inlet air control.
Pour a large quantity of coarse salt, baking soda
or cool ashes on top of the fire in the firebox.
4. If the chimney is operating too cool, water will
condense in the chimney and run back into the
furnace. Creosote formation will be rapid and
may block the chimney. Operate the furnace at
a high enough fire to keep the chimney warm,
preventing this condensation.
5. If the fire burns well, but sometimes smokes or
burns slowly, it may be caused by the chimney
top being lower than another part of the house
or a nearby tree. The wind blowing over a house
or a tree, falls on top of the chimney like water
over a dam, beating down the smoke. The top
of the chimney should be at least 3 feet above
the roof and be at least 2 feet higher than any
point of the roof within 10 feet.
6. See page 18 for list of trouble shooting tips.
minimum reading.
A chimney fire may cause ignition
of wall studs or rafters which you
thought were a safe distance from
the chimney. If you have a chimney
fire, have your chimney inspected by
a qualified person before using again.
17
CAUTION
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