18
PROBABLE CAUSE
• is sufficient to vaporize the
residue.
• Unit is not connected to return air
and is drawing smoke fumes from the
flue.
• Excessively long run of stove pipe
from furnace to flue.
• Too many elbows.
• Insufficient flue size.
• Cast iron damper in "CLOSED"
position.
• Flue has a cold spot which inhibits
exhaust discharge from rising prop-
erly. This symptom may occur in fac-
tory built flues because the insulation
has settled or a seam has ruptured. In
masonry flues, mortar loss may be
causing the aspiration of cooler out-
side air into the stack.
• There is an obstruction outside the
chimney, such as a tree.
• Flue is located to close to the peak
of the roof or does not rise above it to
provide the proper draft.
SUGGESTED REMEDY
Connect to return air duct system.
Relocate the furnace so that the hori-
zontal run does not exceed five feet
(5’) and has a two inch (2")
rise per foot.
The run should not contain more
than two (2) elbows.
Replace with a larger flue providing
a minimum of fifty square inches of
draft area but not more than 100
square inches of draft area. If flue is
within these specifications, check the
draft with a gauge. Your flue should
provide a minimum of .08 water
column inches.
Open damper.
Check entire flue for structural in-
tegrity and leakage. Correct or re-
pair as needed.
Remove obstruction.
Relocate flue termination or
increase height as required.
TROUBLESHOOTING
TROUBLESHOOTING
TROUBLESHOOTING
TROUBLESHOOTING
TROUBLESHOOTING
PROBLEM
7. Odor detected . . .
C
ONTINUED
8. Smoke from the fire chamber
is puffing back through forced
draft motor.
9. Down draft on chimney caused
by one or more of the following:
