8.
Problem: Rapid accumulation of creosote in furnace and flue.
Possible Causes:
Remedies:
• Completely avoid using if at all possible. If hardwoods are not available, fuel the furnace with smaller loads. This will cause the thermostat to call for more heat more often, which will initiate the running of the draft blower. Consequently, the fires will be hotter, thereby reducing the accumulation of creosote. • Install flue gas thermometer and maintain stack temperatures between 300° and 400° F. • See #9. • Inspect entire flue run, from the exhaust stack of the furnace to the termination cap. Repair as necessary. • DANGER: Never use uninsulated stove pipe as chimney. Uninsulated pipe cannot be used as an outside flue because it causes rapid cooling of the stack gases, which causes them to condense as creosote on the inside of the flue.
• Use of high resin wood, such as pine.
• Under-firing the furnace has
caused low flue gas temperature.
• Insufficient chimney draft.
• Using uninsulated stove pipe for the chimney.
• Improper connection in stove pipe causing air leakage or a structural defect in the chimney itself. • Fire box not receiving adequate amount of oxygen.
• Chimney is not tall enough, see “10/2 Rule” on page 7.
9.
Problem: Smoke from the fire chamber is puffing back through the forced draft motor.
Remedies:
Possible Causes:
• Chimney is not high enough.
• Chimney should be a mininum of 6 feet high or refer to “10/2 Rule,” see page 7 for details.
10.
Problem: Insufficient air flow from the heat registers.
Possible Causes:
Remedies:
• Connect air to the home to circulate air flow.
• Return air not connected to furnace from the house.
• Excessive duct run to the house.
• Reduce duct run by placing the furnace closer to the house. • Replace air filter.
• Air filter is dirty, restricting air flow. • The use of 90° elbows in the duct run. • The hot air supply is being short cycled back through the return instead of going down stream to the house. • If using flex duct, it is not straight and pulled tight. A sagging line will cause swirling in the duct and reduct air flow.
• Remove 90° elbows and replace with 45° elbows.
• Redirect the hot air supply to send it down the air duct supply line. You may install a back draft damper from the direction of the return air.
• Ensure the flex duct is pulled tight and straight with no snags. Always go into your main supply lines at a slant pointing down stream.
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