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NORA Oilheat Technicians Manual

check the oil tank for water during tune-up. If you find water in the tank report it to your supervisor so arrangements can be made for it to be removed and an investigation made as to the source. Be sure to tighten any tank plugs you may have removed while checking the tank for water when you are finished. See Chapter 3 for tank inspection procedures and more information on tank maintenance. Step 4. Oil lines, valves, and filters: Shut off the oil valve and remove the filter canister—use a pan to collect the extra oil. Clean and check the filter canister and replace the cartridge and gaskets. If you find evidence of excessive sludge or water, notify your supervisor so corrective action can be scheduled. Inspect the oil line for leaks, kinks or dents. If the line is run underground check to be sure it is made of coated copper or run in protective tubing; if bare copper is run underground, report it to your office. Make sure there are no compression fittings. If you find any, replace them with flare fittings. Step 5. Fuel unit: Clean or replace the pump strainer, carefully scraping off the old gasket before installing a new one. Open the valve, turn the switch on and bleed the unit. Run oil through a clear tube into a container until there are no visible air bubbles. Check for leaks at the valve stem, filter, and the pump gasket. Disconnect the nozzle line from the drawer assembly and install your pressure gauge on the nozzle line. Operate the unit until the pressure holds steady and increase the pressure 40-50 PSI above the recommended 14-6 Preventative Maintenance Tune-ups setting. Check that the pressure reading changes smoothly as you turn the adjustment screw. A pulsating or bouncing needle could indicate a leaking oil line or a bad pump. After adjusting the pump back to its proper setting, wait until the unit shuts off on safety and verify the primary control’s safety timing. When the unit shuts off, the pump pressure should drop no more than 15 to 20% and then hold steady. If the pressure continues to drop, the pump has a bad cut-off and requires replacement. Step 6. Nozzle or firing assembly: Mark the position of the firing assembly on the burner housing—remove it and note the nozzle type, size and spray angle. Verify that these match the unit data plate or the listing in your manufacturer’s OEM guide. Remove the nozzle and carefully drain the oil into a container. Inspect the nozzle adapter. Replace it if it’s stripped, cracked, or if the seat is worn. Flush out the assembly, fill it with clean oil and install a new nozzle. Clean, inspect and adjust the electrodes using the appropriate gauge. Clean and inspect the air tube, including Fuel line pressure gauge Dirty strainer Checking pressure gauge on nozzle line Chapter 14 Preventative Maint./Tuneups


NORA Oilheat Technicians Manual
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