Troubleshooting - Lennox MP-420D Homeowner's Care And Operation Instructions Manual

WARNING
Continued overfi ring can perma-
nently damage your fi replace
system. Some examples of
overfi ring are:
• Burning quantities of scrap
lumber, pine branches, paper or
cardboard boxes which exceed
the volume of the normal log
fi re.
• Burning trash, chemicals or
chemically treated combus-
tibles.
AVERTISSEMENT
Si vous surchauffez continuel-
lement votre foyer, vous pour-
riez l'endommager de façon
permanente. Voici quelques
exemples:
• Vous brûlez des déchets,
du bois de construction, des
branches de pins, du papier,
des boîtes de carton qui excè-
dent le volume de feu de bois
normal du foyer. Vous risquez
sérieusement d'endommager
votre système.
• Vous brûlez des substances
telles que : enduit protecteur
pour le bois, papier métallique,
charbon, plastique, rebuts,
souffre ou huile vous pourriez
gravement endommager votre
foyer. Ne brûlez que du bois
non-traité.

TROUBLESHOOTING

Note: "Smoke Free" operation is not warranted
nor are we responsible for inadequate system
draft, general construction conditions, inad-
equate chimney heights, adverse wind condi-
tions and/or unusual environmental factors or
conditions beyond our control.
If you do experience a problem, here are several
things to check:
1. Remember – always check to ensure your
fl ue damper is in the open position before
lighting a fi re!
2. When lighting your fi re, a little smoke may
escape into the room – more likely if the
chimney is cold. To correct this, hold a
lighted newspaper up inside the fi rebox near
the open fl ue damper. This will turn around
any downdraft and clear the fl ue of cold air.
As your log fi re burns below, the updraft will
improve as the chimney heats up.
3. Is your fi re too far forward? Move it toward
the back with your poker. Keep the fi re well
within the confi nes of your fuel grate.
4. Keep your fi re up on the grate and the re-
fractory below free of excessive ashes. The
fi re needs plenty of air movement around
the logs.
5. In indoor installations, if smoking occurs an
hour or two after lighting the fi re, perhaps
your well-insulated house is too airtight
and there is scarcely any way for replace-
ment air to enter and feed the fi re. Check
to see if your outside combustion air kit,
if installed, is open (see Figure 3). Check
outside to ensure no obstructions are in
front of exterior air entry. Open a window
slightly, open doors to one or two rooms
and see if this stops the smoking.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
6. Is a vent fan, exhaust hood or central heat-
ing/cooling system stealing combustion air
from your fi replace? If their volume is high
enough, this can cause negative pressure
and an unwanted downdraft – and smok-
ing.
7. Is your wood fuel too wet or unseasoned?
Or does it contain some chemical substance
that causes sputtering, smoking and toxic
fumes?
8. Is a breeze or wind blowing? This can
cause negative pressure and an unwanted
downdraft – and smoking.
9. Figure 6 illustrates the correct height of
your chimney top for indoor installations.
It is unlikely that your installation does not
adhere to the installation instructions. How-
ever, if not correct, you could experience
an unusual downdraft. Usually, the best
solution is to increase the chimney height.
This may also be necessary if nearby trees,
adjoining roof lines or a hill is causing a
downdraft condition.
10. Remember, your fi replace has been de-
signed as a supplemental heating device
only, it is not intended to heat your entire
home.
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