Burnham L7248 manual High Altitude Installations

(4) Tank connection leaks.

There are various test kits available to trace air leaks, such as electronic sight glasses. Follow the manufacturers' instructions to find air leaks.

The following actions can eliminate air leaks:

(1)Bleed pump as detailed previously.

(2)Replace flare fittings.

(3)Replace oil supply line.

(4)Repair oil filter leaks.

(5)Replace or repair tank fittings.

IMPORTANT

CHECK TEST PROCEDURE. A very good test for isolating fuel side problems is to disconnect the fuel system and with a 2' length of tubing, fire out of an auxiliary five gallon pail of clean, fresh, warm #2 oil from another source. If the burner runs successfully when drawing out of the auxiliary pail then the problem is isolated to the fuel or fuel lines being used on the jobsite.

E.GASKET LEAKS — If 11.5 to 12.5% CO2 with a #1 smoke or less cannot be obtained in the breeching, look for air leaks around the flue collar.

Such air leaks will cause a lower CO2 reading in the breeching. The smaller the firing rate the greater effect an air leak can have on CO2 readings.

F.DIRT — A fuel filter is a good investment. Acci- dental accumulation of dirt in the fuel system can clog the nozzle or nozzle strainer and produce a poor spray pattern from the nozzle. The smaller the firing rate, the smaller the slots become in the nozzle and the more prone to plugging it becomes with the same amount of dirt.

G.WATER — Water in the fuel in large amounts will stall the fuel pump. Water in the fuel in smaller amounts will cause excessive wear on the pump, but more importantly water doesn’t burn. It chills the flame and causes smoke and unburned fuel to pass out of the combustion chamber and clog the flueways of the boiler.

H.COLD OIL — If the oil temperature approaching the fuel pump is 40°F or lower poor combustion or delayed ignition may result. Cold oil is harder to atomize at the nozzle. Thus, the spray droplets get larger and the flame shape gets longer. An outside fuel tank that is above grade or has fuel lines in a shallow bury is a good candidate for cold oil. The best solution is to bury the tank and lines deep enough to keep the oil above 40°F.

I.HIGH ALTITUDE INSTALLATIONS

Air settings must be increased at higher altitudes. Use instruments and set for 11.5 to 12.5% CO2.

J.START-UP NOISE — Late ignition is the cause of start-up noises. If it occurs recheck for electrode settings, flame shape, air or water in the fuel lines.

K.SHUT DOWN NOISE — If the flame runs out of air before it runs out of fuel, an after burn with noise may occur. That may be the result of a faulty cut- off valve in the fuel pump, or it may be air trapped in the nozzle line. It may take several firing cycles for that air to be fully vented through the nozzle.

Water in the fuel or poor flame shape can also cause shut down noises.

15. ATTENTION TO BOILER WHILE NOT IN OPERATION.

IMPORTANT

IF BOILER IS NOT USED DURING WINTER TIME, IT MUST BE FULLY DRAINED TO PREVENT FREEZE DAMAGE.

A.Spray inside surfaces with light lubricating or crankcase oil using gun with extended stem so as to reach all corners.

B.Always keep the manual fuel supply valve shut off if the burner is shut down for an extended period of time.

C.To recondition the heating system in the fall season after a prolonged shut down, follow the instructions outlined in Section III — Operating and Service Instructions, Items 1 through 8.

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