Yukon Eagle BIG JACK BJ90, Owner'S Manual

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fAULty CHIMNEy ANd/oR dRAft PRoBLEMS -
CAUSES ANd CURES
A sound chimney system is imperative, especially when burning
wood. Indoor chimneys, either masonry or type "HT" metal chim-
neys are best. Because warm air rises, a warm chimney allows the
smoke and other by-products of combustion a natural exit up and
out the chimney. Outdoor chimneys should be your last choice. Cold
air naturally falls right down the cold chimney. Until the heat from
the furnace warms the chimney, there is no natural draft to allow the
smoke and by-products of combustion to rise naturally up the chim-
ney. Outdoor class "A" triple wall is not acceptable because their
thermo-siphon design will not allow the chimney to heat up, causing
heavy creosote build-up and possible chimney fires.
If you know your chimney is sound and you still have downdraft
problems such as smoke or smell in the room in which the furnace
is located, your chimney may not be operating properly. One or
more of the following suggestions may be necessary.
1. Barometric draft control - This control must be set at .03.
This is just a guide. It must be set with a draft gauge to
prove that the chimney is drawing .03.
2.
Combustion air - You must have outdoor combustion air
introduced into the room where the furnace resides in the
manner described on page 12. This method supplies air
for combustion as well as replacing air that is drawn out
by the chimney. Leaky doors and windows will not provide
acceptable results.
3. Cold outdoor chimney - Sometimes in the spring or fall,
or if you live in a mild climate, your heat demands are small
and your chimney just does not heat up enough to induce
a natural exit up draft, you may want to consider a power
vent to force a draft up the chimney. A Model D-3 or AD-1
power venter is available from Tjurnland Manufacturing
Co. in White Bear Lake, Minnesota or Model D1-2 is avail-
able from Field Controls Co., Kinston, North Carolina.
4.
Chimney not tall enough - Your chimney must terminate
at least 2 feet above the peak of the roof. Adding more
chimney height sometimes cures the problem. (See Fig.
12, page 9)
5. Home located on side of hill - When the wind blows over
a hill toward your home, the wind will fall. This could cause
a down-draft into your chimney. Some common solutions
to correct down-drafts are to add a chimney cap with a
weather vane, add height to the chimney or add a power
venter.
6.
tall trees near your home - If you have trees that are
near to and higher than your home, a down-draft can
occur when the wind blows. Correct the same way as if
you live on the side of a hill or in a valley.
7. Chimney too large - Your chimney should not be more
than 8 inches in diameter or the equivalent. If too large,
the sides of the chimney may not heat up to create a
natural draft. When this happens, the smoke and gases
cool. They become heavy and other gases from the fire try
to penetrate this heavy column of cool air. This results in
back puffing, poor combustion or burning and may cause
odors in your home. The solution is to improve your chim-
ney or line it with 8-inch type 304 stainless steel flue liner.
If your large chimney is outside masonry, insulate between
the masonry and 8-inch flue pipe.
toP of CHIMNEy LoWER tHAN
SURRoUNdING oBJECtS
REMEDY: ExtENd CHIMNEy ABoVE
ALL oBJECtS WItHIN 30 fEEt
CHIMNEy CAP PUSHEd oVER fLUE oR
fLUE oBStRUCtEd By A VENtILAtoR
REMEDY: REMoVE oBStRUCtIoN
ACCUMULAtIoN of Soot oR dEBRIS
IN offSEt
REMEDY: REMoVE
AIR LEAKS tHRoUGH CRACKS IN
fLUES ANd CHIMNEy dISCLoSEd By
SMoKE tESt
REMEDY: CLoSE LEAKS WItH CEMENt
fLUE CAP RUSty ANd LEAKy
REMEDY: CLoSE LEAKS
ANotHER StoVE oR HEAtER PIPE
CoNNECtEd to SAME fLUE
REMEDY: REMoVE & SEAL oPENING
VENt PIPE PUSHEd INto fLUE
REMEDY: MAKE ENd fLUSH WItH
INSIdE of fLUE
LooSELy fIttEd VENt PIPE
dISCLoSEd By SMoKE tESt
REMEDY: CLoSE WItH CEMENt
LooSELy fIttEd CLEANoUt dooR
dISCLoSEd By SMoKE tESt
REMEDY: CLoSE LEAKS WItH CEMENt
oPENING BEtWEEN fLUES dISCLoSEd
By SMoKE tESt
REMEdy: CLoSE oPENINGS
to MAKE A SMoKE tESt, USE A SPECIAL SMoKE BoMB ANd
WItH toP of CHIMNEy CLoSEd, LooK foR LEAKS
Wind
V
al
le
y
or
Hi
ll
Trees
Wind
1