19
PROBLEM
PROBABLE CAUSE
• Underfiring has caused low
flue gas temperature.
• Insufficient flue draft.
• Using uninsulated stove pipe
for the chimney flue, especially
if the construction is on the ex-
terior of the home.
• Improper connection in stove
pipe causing air leakage or a
structural defect in the chimney
itself.
• Firebox not receiving
adequate amount of oxygen.
SUGGESTED REMEDY
Install a flue gas thermometer and
maintain a minimum stack tempera-
ture between 300° and 400° F.
See remedy #6.
DANGER
: NEVER use non-insu-
lated stove pipe as chimney. It must
not be used on the inside of your
home because of the high stack tem-
peratures create an extreme fire haz-
ard. Non-insulated pipe cannot be
used as an outside flue, as it causes
rapid cooling of the stack gases, caus-
ing them to condense as creosote on
the inside of the flue.
Inspect entire flue run from the ex-
haust stack of the furnace to the ter-
mination cap. Repair where neces-
sary.
Furnace room may be too airtight to
supply sufficient amount of oxygen
for combustion. We recommend in-
stalling an aperture to the outside con-
sisting of a minimum of fifteen square
inches.
TROUBLESHOOTING