Maintenance
SMOKE IN THE FURNACE ROOM
This condition is usually caused because smoke is not being drawn up through the chimney. Other causes could be a failed (firebox)heat exchanger. Check with your qualified furnace service provider.
Chimney causes:
1.Fresh air for combustion must be supplied to the furnace room.
2.Cold chimney. Warm air rises and cool air falls. Outside chimneys are cold, which can cause downdrafts until the chimney heats up. This usually happens in the spring and fall of the year when outdoor temperatures are mild. These temperatures do not produce enough heat to warm the chimney up.
3.Chimney not tall enough. It must terminate at least 2 feet above the peak of the roof.
4.A downdraft can occur when the wind blows. This happens when your home is in a valley or high trees are near your home. Also, if your house is on the east side of a hill or mountain. One solution is to add a chimney cap with a weather vane. This often will turn a downdraft into an updraft. Another solution is to add height to your chimney. Another solution is to add a power ventor to the smoke pipe. The power ventor operates when the thermostat is calling for wood heat.
5.The barometric draft control must be set at .03.
If set less, the chimney may not draw. If set higher, the wood fire may draw too much combustion air. This causes the room temperature to exceed the thermostat setting.
TOP OF CHIMNEY LOWER THAN SURROUND-
ING OBJECTS
REMEDY: EXTEND CHIMNEY ABOVE ALL OB-
JECTS WITHIN 30 FEET.
CHIMNEY CAP PUSHED OVER FLUE OR FLU
OBSTRUCTED BY A VENTILATOR
REMEDY: REMOVE OBSTRUCTION
ACCUMULATION OF SOOT OR DEBRIS IN
OFFSET
REMEDY: REMOVE
AIR LEAKS THROUGH CRACKS IN FLUE AND
CHIMNEY DISCLOSED BY SMOKE TEST
REMEDY: CLOSE LEAKS WITH CEMENT
FLUE CAP RUSTY AND LEAKY
REMEDY: CLOSE LEAKS
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 CLEAN OUT DOOR DIS-
CLOSED 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.
FIG. 46
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