Prepare The Burner; Low Firing Rate Baffle; Burner Fuel Unit; Attach Air Tube - Beckett AF Manual

Inspect/Prepare |nstallation Site
Prepare the Burner
Low Firing Rate Baffle
The AFG Low Firing Rate Baffle (LFRB) reduces
the air flow and pressure. The LFRB is sometimes
used for firing rates under 1.00 gph as listed in
Table 4. Refer to the appliance manufacturer's in-
structions. Do not omit the LFRB when specified.
Omitting the baffle when specified or installing the
baffle when not specified could result in impaired
burner performance.
Burner fuel unit
• Verify that the burner fuel unit is compatible with
the oil supply system. For more details, refer to
the pump manufacturer's instructions provided
with the burner.
Attach air tube (if not already installed)
If using a flange and gasket, slide them onto the air
tube. Then attach the air tube to the burner chassis
using the four sheet metal screws provided. Refer
to Figure 4 for details.
Nozzle and Pump Pressure
Correct Nozzle and Flow
Rate Required
incorrect nozzles and flow rates
could result in impaired combus=
tion, under-firing, over-firing, soot-
ing, puff-back of hot gases, smoke
and potential fire or asphyxiation hazards.
Use only nozzles having the brand, flow rate (gph), spray
angle and pattern specified by the appliance manufac-
turer.
Follow the appliance manufacturer's specifications for
the required pump outlet pressure for the nozzle, since
this affects the flow rate.
• Nozzle manufacturers calibrate nozzle flow rates
at 100 psig.
• When pump pressures are higher than 100 psig,
the actual nozzle flow rate will be greater than
the gph stamped on the nozzle body. (Example:
A 1.00 gph nozzle at 140 psig = 1.18 gph)
Securely tighten the nozzle (90 torque inch pounds). For
typical nozzle flow rates at various pressures refer to
Table 5.
Table 4. AFG Reduced Firing Rates (with
LFRB)
Burner head type Low Firing Rate Baffle installed
F0 up to 0.65gph
F3or L1 up to 0.85gph
F4or F6 up to 0.90gph
V1 up to 1.00gph
Table 5. Nozzle Flow Rate by Size
Nozzle flow rate U. S. gallons per hour of No. 2 fuel oil when
pump pressure (psig) is:
125 140 psi 150 psi 175 psi 200 psi
psi
Nozzle
size
(rated at
100 psig)
0.40 0.45 0.47 0.49 0.53 0.56
0.50 0.56 0.59 0.61 0.66 0.71
0.60 0.67 0.71 0.74 0.79 0.85
0.65 0.73 0.77 0.80 0.86 0.92
0.75 0.84 0.89 0.92 0.99 1.06
0.85 0.95 1.01 1.04 1.13 1.20
0.90 1.01 1.07 1.10 1.19 1.27
1.00 1.12 1.18 1.23 1.32 1.41
1.10 1.23 1.30 1.35 1.46 1.56
1.20 1.34 1.42 1.47 1.59 1.70
1.25 1.39 1.48 1.53 1.65 1.77
1.35 1.51 1.60 1.65 1.79 1.91
1.50 1.68 1.77 1.84 1.98 2.12
1.65 1.84 1.95 2.02 2.18 2.33
1.75 1.96 2.07 2.14 2.32 2.48
2.00 2.24 2.37 2.45 2.65 2.83
2.25 2.52 2.66 2.76 2.98
2.50 2.80 2.96
Install burner nozzle (if not already in-
stalled)
1. Remove the plastic plug protecting the nozzle
adapter threads
2. Place a 3/4" open-end wrench on the nozzle
adapter. Insert the nozzle into the adapter and fin-
ger tighten. Finish tightening with a 5/8" open-end
wrench. Use care to avoid bending the burner head
support legs or electrodes. If you remove the head
to replace the nozzle (type '%1"/"L2" or "Vl" heads),
carefully reconnect the head to the nozzle adapter,
making sure that the head support makes contact
with the nozzle adapter shoulder. Refer to Figure
5or6.
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