York P3DHX12F08001 Burner Electrodes, OIL Burner SET-UP, Preparations, Procedure

OIL BURNER

P*LBX furnaces are equipped with Beckett AF Series oil burners with the Beckett CleanCut pump and R7184B oil primary control. P*DHX furnaces are equipped with Beckett AF Series oil burners with the R8184N oil primary con- trol. The oil burner must align properly with the cerafelt fiber chamber (firepot). The cerafelt fiber chamber is initially quite soft, but hardens and becomes quite brittle after the first firing. The fire- pot is held in place by a retaining bracket; however, it is possible for the firepot to shift if subjected to rough han- dling during transit.

BEFORE OPERATING THE FUR- NACE CHECK BURNER ALIGNMENT WITH COMBUSTION CHAMBER. THE END CONE OF THE AIR TUBE MUST BE CENTRED TO THE AC- COMODATING RING PROVIDED IN THE DESIGN OF THE COMBUSTION CHAMBER. ADJUST ALIGNMENT AS NECESSARY BEFORE THE FIRST FIRING.

OIL BURNER NOZZLES

All furnace models are certified for multi- ple firing rates. Choose the firing rate that most closely matches the calculated heat loss of the building. Models, firing rates and nozzles are listed in Appendix A: AF Burner Set-Up.

BURNER ELECTRODES

Correct positioning of the electrode tips with respect to each other, to the fuel oil nozzle, and to the rest of the burners is essential for smooth light ups and proper operation. The electrode tips should be adjusted to a gap of 5/32”, 1/16” ahead of the nozzle, 5/16” above the centerline of the nozzle. The “Z” dimension (front edge of the burner head to the front face of the nozzle is 1-1/8 inches.

Electrode positioning should be checked before the first firing of the furnace.

The electrode porcelains should be free of cracks, the electrode tips should be tapered and free of burrs, and the con- tact rods must be clean and be in firm contact with the ignition transformer con- tact springs. The electrodes must not come into contact with the burner head.

OIL BURNER SET-UP

The burner air supply is adjusted to maintain the fuel to air ratio to obtain ideal combustion conditions. A lack of air causes "soft" and "sooty" flames, result- ing in soot build-up throughout the heat exchanger passages. Excess combus- tion air causes a bright roaring fire and high stack temperatures resulting in poor fuel efficiency.

PREPARATIONS:

Drill a ¼” test port in the venting, ideally at least 2 flue pipe diameters away from the furnace breeching, if venting horizon- tally from the furnace, (typically P*LBX) or from the flue pipe elbow if venting vertically (typically P*DHX) before reach- ing the furnace. (see Figures 4 and 5).

The test port will allow flue gas samples to be taken and stack temperatures to be measured.

Before starting the burner, check the burner alignment with the combustion chamber (fire pot), check that the correct nozzle is tightened into place, and that the burner electrodes are properly posi- tioned.

The Beckett burner bulk air band should be closed, and the air shutter initial set- ting should be approximately 7.00.

Note A: Locate hole at least 6 inches on the furnace side of the draft control.

Note B: Ideally, hole should be at least 12 inches from breeching or elbow.

PROCEDURE:

Start the burner and allow it to run at least ten minutes. Set the air shutter to give a good flame visually. The combus- tion air supply to the burner is controlled by adjusting the air shutter on the left side of the burner, and, if necessary, the bulk air band. To adjust, loosen the bolt on the movable shutter. Move the shutter gradually until a good flame (visually) has been achieved. Re-snug the bolt.

Check the initial draft setting as the fur- nace warms up. The draft may be meas- ured at the test port. The final breech draft should be - 0.02 inches w.c. to provide adequate over-fire draft.

Fig. 4: Horizontal Smoke Test Port Location Fig. 5: Vertical Smoke Test Port Location

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