Oil Furnace Do's and Don't
The best maintenance to your oil furnace to help eliminate many problems before they begin. Using these oil furnace maintenance tips will be a great start.
If your furnace isn't working, use the below troubleshooting chart find a possible solution.
What is proper service.
Smoke Test: To set up the Air/Fuel ratio a sample of the exhaust must be tested. By drawing air through a filter paper, the colour of which allow the technician to set the air shutter. Too little air will cause shooting, reduce efficiency and restrict the heat exchanger. Too much air will reduce the combustion temperature and reduce efficiency.
Clean the Combustion Chamber: There are normally two inspection ports on the furnace. This allows access the secondary flue passage of the heat exchanger, for inspection and cleaning. This can be cleaned using a vacuum (with a good filter ) and a soft brass brush.
Barometric Draft: The swing damper on the vent connector controls the draft up the chimney. If the draft is too high, the hot flue gases will pass thorough the heat exchanger too quickly, sending the heat up the chimney. Draft should be a set a 0.02"W.C.- 0.03" W.C. This is a very small amount of pressure. If the barometric damper door is sticky at all, it will not control the draft properly.
Oil Pump Pressure: The oil nozzle is design to work at 100 psi, to provide a proper spray pattern and flow rate of fuel. Higher pressures can cause the furnace to over heat, lower pressure can collapse the spray pattern, resulting in a poor flame. An accurate pressure gauge should be installed on the oil pump.
Oil Nozzle: The oil nozzle meters the flow of oil to the combustion chamber and create the proper spray pattern which controls the shape of the flame in the combustion chamber. The nozzle consist of a small opening in the tip, a spinner located behind the opening, and a brass filter. The opening can clog up very easily, the spinner will wear at the opening causing the flame pattern to change, and the brass filters can plug up. The nozzle should be change regularly. Approxmently every 500 hours of operations. A faulty nozzle is often the problem when the furnace fails to light.
Ignitor Position: The Ignitors must be in the proper position in order to light. The points should be 1/2" above, 1/8" ahead of the nozzle with an 1/8" gap. This works with most oil furnaces. Ignitor Drawing.
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