Beckett AFII manual Nozzle Installation, Nozzle Flow Rate by Size

Section: Perform Regular Maintenance

Shutting the Burner Off

Always keep the fuel oil supply valve shut off if the

burner(s) is shut down for an extended period of time.

Turn off all electric power to the burner. Note: There could be more than one disconnect switch.

1.Turn off power to burner before proceeding.

2.Disconnect copper oil connector tube from nozzle line.

3.Loosen the screw that fastens the rear access door.

4.Remove splined nut.

5.Remove the nozzle line assembly from the burner, being careful not to damage the electrodes or insulators while handling. Stop halfway to remove igniter/transformer wires.

Removing Nozzle Line for Service

Correct Nozzle and Flow

Rate Required

Incorrect nozzles and flow rates could result in impaired combustion, under- firing, over-firing, sooting, 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 manufacturer.

Follow the appliance manufacturer’s specifications for the required pump outlet pressure for the nozzle, since this affects the flow rate.

yNozzle manufacturers calibrate nozzle flow rates at 100 psig.

yWhen 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 - Nozzle Flow Rate by Size

Nozzle flow rate U. S. gallons per hour of No. 2 fuel oil

when pump pressure (psig) is:

Nozzle		140 psi
size (rated	125		150	175	200
		(factory
at 100	psi		psi	psi	psi
		std.)
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	-	-
1.35	1.51	-	-	-	-

6.To replace the nozzle assembly, reverse the above steps. “HLX” head air tubes – Be sure stop screw is fastened securely. Seat stop screw on back of choke ring to set the position of the head. “FBX” head air tubes – Use T gauge to set the “Z” dimension to 1-1/8” +/- 1/32”

Nozzle Installation

Perform the following steps when replacing a nozzle.

1.Remove the nozzle line assembly to gain access to the nozzle.

2.Use a 3/4” open-end wrench to hold the nozzle adapter. DO NOT attempt to remove or replace the nozzle without securing the adapter, as nozzle alignment could be seriously affected.

3.Do not squeeze the electrodes when handling the nozzle line assembly. Excessive force could change the electrode tip settings or damage the ceramic electrode insulators.

4.Use a 5/8” open-end wrench to carefully remove the existing nozzle.

5.Inspect the nozzle adapter before installing the new nozzle. If it is grooved or scratched on the sealing surface, replace the nozzle line assembly. If the surface is damaged, oil could leak at the nozzle to adapter joint, causing serious combustion problems.

6.Protect the nozzle orifice and strainer when installing. If the orifice gets dirt in it or is scratched, the nozzle will not function properly.

7.To install a new nozzle, place a 3/4” open-end wrench on the nozzle adapter. Insert the nozzle into the adapter and secure finger tight. Finish tightening with a 3/8” open-end wrench. Use care to avoid bending the burner head support legs or electrodes.

8.Do not over-torque the nozzle when installing. This will cause deep grooves in the nozzle adapter, preventing a seal when a new nozzle is installed.

9.Carefully check and realign the electrode tips after replacing a nozzle, ensuring the electrode settings comply with Figure 11a or 11b.

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