Beckett AFII Manual Do Utilizador

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 

(factory 

std.)

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

-

-

1.35

1.51

-

-

-

-

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

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

Turn off power to burner before proceeding.
Disconnect copper oil connector tube from nozzle 
line.
Loosen the screw that fastens the rear access door.
Remove splined nut.
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.
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

”

Perform the following steps when replacing a nozzle.

Remove the nozzle line assembly to gain access to 
the nozzle. 
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. 
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.
Use a 5/8” open-end wrench to carefully remove the 
existing nozzle.
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.
Protect the nozzle orifi ce and strainer when 
installing. If the orifi ce gets dirt in it or is scratched, 
the nozzle will not function properly.
To install a new nozzle, place a 3/4” open-end 
wrench on the nozzle adapter. Insert the nozzle 
into the adapter and secure fi nger tight. Finish 
tightening with a 3/8” open-end wrench. Use care 
to avoid bending the burner head support legs or 
electrodes.
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.
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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