12
OIl buRNeR AIR ADjusTMeNT
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, resulting in soot build-up throughout the heat
exchanger passages. Excess combustion air causes a bright roaring
fire and high stack temperatures resulting in poor fuel efficiency. The
HTL-D and HTLV-D furnaces operate most efficiently with a No. 1
smoke spot on the Bacharach Scale. This is not necessarily the opti-
mum setting; however, because dust will inevitably build up on the
air moving components of the oil burner assembly. This will result
in decreased air supply with the potential result of soot building up
in the flue gas passageways of the heat exchanger. Soot behaves as an
insulator and impairs good heat transfer. Stack temperature will in-
crease, and the overall efficiency will decrease. As a means of avoid-
ing this problem, it is advisable to adjust the air supply to provide no
more than a trace smoke spot on the Bacharach Scale.
For complete details, consult the oil burner instruction manual pro-
vided in the furnace documents envelope.
beckett Af burner
Adjust the air shutter by loosening the locking screws and moving
the air shutter, and if necessary, the bulk air band.
beckett NX burner
Adjust the burner Head/Air supply by first loosening the spline
screw. Turn the adjustment screw clockwise to decrease the com-
bustion air and counter-clockwise to increase the combustion air.
Re-tighten the spline screw after obtaining the proper setting. (Refer
to Beckett NX Oil Burner manual).
Riello 40 series (chimney Vented)
Riello burners are factory set with respect to nozzle size; pump pres-
sure, air gate and turbulator adjustments for each model and firing
rate. By removing the burner cover and loosening the screws that
secure the air adjustment plate, the combustion air can be adjusted.
Move the adjusting plate to either increase or decrease combustion
air. When the proper air setting is achieved, retighten the fixing
screws.
buRNeR elecTRODes
Adjustment of the electrode tips with respect to each other, the
nozzle, and to the rest of the burner is very important to ensure
smooth start-ups and to permit efficient combustion.
beckett Af burner
Electrode gap: 5/32 inch.
Distance above horizontal centerline: 5/16 inch. Older instruction
sheets specify 7/16 inch. The current specification is 5/16 inch.
Distance ahead of nozzle: 1/16 inch.
“Z” dimension, the distance from the front of the end cone (head)
to the face of the nozzle should be 1-1/8 inches. If a ceramic head is
used, the distance from the end cone to the nozzle face is increased
to 1-3/8 inches.
beckett NX burner
Electrode gap: 5/32 inch.
Distance above nozzle centre line: 1/4 inch.
Nozzle-to-electrode tip Spacing: 3/32 inch.
Riello 40f
Electrode gap: 5/32 inch.
Distance above horizontal centerline: 13/64 inch.
Distance ahead of nozzle: 5/64 to 7/64 inch.
Summary of Contents for HTL-90D
Page 18: ...18 Wiring Diagrams Figure 6 Chimney Vent Burner Wiring Diagram HTL D HTLV D...
Page 22: ...22 Oil Primary Control Sequence of Operation...
Page 31: ...31 Homeowner s Reference Table...
Page 33: ...33 PARTS LISTING HIGHBOY MODEL HTL D AND HTLV D Figure 9 Model HTL D and HTLV D...
Page 34: ...34 HTL D HTLV D Oil Fired Warm Air Furnace NOTES...
