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NORA Oilheat Technicians Manual

Chapter 14 Preventative Maint./Tuneups Chapter 14—Preventative Maintenance Tune-ups 14-7 the end cone slots and holes. Verify that the air tube is inserted to the correct position. Reinsert the nozzle assembly into the air tube and secure it in place, making sure it is in the same position that you marked earlier. Step 7. Burner motor, housing and fan: Remove the burner motor and check the burner housing for oil that could indicate a loose fitting, cracked flare or leaking fuel pump seal. If there are oiling points on the motor; lubricate each with 3-4 drops of SAE 20 non-detergent oil. Cooling slots should be clear. Check the motor shaft for end play; if it is excessive, replace the motor. Inspect the burner coupling to be sure it is not worn or stripped. Clean the air inlets and fan using a small brush. After you reinstall the motor, spin the fan a few times to make sure that the motor, fan and pump are moving freely and that everything is properly connected. Check all wires and connections at the burner. Step 8. Transformer and cad cell: Clean and check the transformer bushings and springs. Inspect the ignition wires. Clean the cad cell eye and wires. Make sure the bracket is positioned correctly for good flame sighting. As you close the transformer, be sure the electrodes are making solid contact with the transformer springs and that no wires are being crimped. Step 9. Clean the flue pipe: Remove the flue pipe and brush it out, inspect the pipe’s condition, replace it if necessary. Check the draft regulator to be sure it swings freely. If the unit has a stack relay, inspect and clean the helix and the relay contacts. Clean out the chimney base and check the chimney for blockages. If there’s an accumulation of broken brick or liner, advise the customer to contact a chimney professional and note this information on your service ticket. If the unit is equipped for power venting, clean and check the fan blower wheel. Oil the motor and check the draftproving switch. Remember to check and clean the outside hood and exterior mechanism. Step 10. Clean the heat exchanger and combustion area: Remove any baffles and scrub the flue passages, keeping your vacuum hose close to the brush to avoid spreading soot. Look for signs of air or water leaks. Use a soot snorkel to clean the combustion area, being careful not to damage the chamber or target wall. Inspect the condition of the refractory material and repair or replace it as necessary. Step 11. Replace, seal and fasten: Reassemble the unit using furnace cement if necessary to seal any air leaks. Double-check Using a fan brush Adjusting draft regulator on flue Using a vacuum


NORA Oilheat Technicians Manual
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