Beckett AFG - Manual (Page 8)

8
Table 4. AFG Reduced Firing Rates (with LFRB)
Burner head type Low Firing Rate Baffl e installed
F0 up to 0.65 gph
F3 or L1 up to 0.85 gph
F4 or F6 up to 0.90 gph
V1 up to 1.00 gph
Prepare the Burner
Low Firing Rate Baffl e
The AFG Low Firing Rate Baffl e (LFRB) reduces the
air fl ow and pressure. The LFRB is sometimes used for
fi ring rates under 1.00 gph as listed in Table 4. Refer
to the appliance manufacturer’s instructions. Do not
omit the LFRB when specifi ed. Omitting the baffl e when
specifi ed or installing the baffl e when not specifi ed 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 fl ange 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
Install burner nozzle (if not already installed)
Remove the plastic plug protecting the nozzle
adapter threads
Place a 3/4” open-end wrench on the nozzle
adapter. Insert the nozzle into the adapter and
fi nger 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 “L1”/“L2” or “V1” 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 5 or 6. 1.
2.
Section: Prepare the Burner
Use only nozzles having the brand, fl ow rate (gph),
spray angle and pattern specifi ed by the appliance
manufacturer.
Follow the appliance manufacturer’s specifi cations for
the required pump outlet pressure for the nozzle, since
this affects the fl ow rate.
Nozzle manufacturers calibrate nozzle fl ow rates at
100 psig.
When pump pressures are higher than 100 psig, the
actual nozzle fl ow 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 fl ow rates at various pressures refer to
Table 5.
y
y
Incorrect nozzles and fl ow rates could
result in impaired combustion, under-
fi ring, over-fi ring, sooting, puff-back of
hot gases, smoke and potential fi re or
asphyxiation hazards.
Correct Nozzle and Flow
Rate Required
Table 5. Nozzle Flow Rate by Size
Nozzle fl ow rate U. S. gallons per hour of No. 2 fuel
oil when pump pressure (psig) is:
Nozzle
size
(rated at
100 psig)
125 psi 140 psi 150 psi 175 psi 200 psi
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 - - -