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• Annually, have a bottom sample from the fuel oil tank taken for analysis. If present
in excessive quantities, sludge and water should be removed. Fuel oil additives may
be of benefit in helping to resolve some problems that are indicated by the analysis.
In severe cases, tank cleaning may be required. Consult your fuel oil supplier for
recommendations.
Extended Shutdown
If the furnace will be shutdown for an extended period of time:
1) Adjust the room thermostat to the lowest set point and set the operating mode, if
equipped, to “OFF”.
2) Open the disconnecting switch serving the furnace.
3) Close the manual oil shutoff valve.
4) To promote smooth startup and nuisance free operation, fuel oil quality must be
maintained at a high level. In cases where biological contamination of the fuel oil
tank is evident or suspected, consider treating the fuel oil with a biocide approved
for fuel oil applications. In addition, for non-low sulfur fuel oils, an antioxidant
additive may be beneficial in promoting fuel stability. After adding any fuel oil
treatment, completely fill the oil tank to promote mixing of the additive with the
fuel.
Combustion and Ventilation Air Supply
The furnace and venting system require a generous amount of clean air to operate
safely. Lack of adequate combustion and ventilation air can result in erratic operation of
the burner, noisy and poor combustion, sooting of the combustion chamber, and fuel
odors in the air. Never block off or restrict the supply of air to the furnace.
Inspection Areas
Burner Compartment: On the highboy and lowboy furnace models, the burner
compartment can be inspected by removing the front door of the furnace. Look for signs
of excessive heat, such as discoloration of components, damage to material from rust or
corrosion, soot or carbon build-up, and evidence of fuel oil leakage.
Exterior Of Furnace: The exterior of the furnace should be inspected for signs of
excessive heat such as discoloration of materials and damage from rust or corrosion.
Confirm the base or frame supporting the furnace in level and in sound condition.