Beckett ADC 24Vdc - Manual (Page 5)

5 24 Vdc ADC Burner Manual
Section: Nozzle Assembly Maintenance
Correct Nozzle and Flow
Rate Required
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.
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.
y Nozzle manufacturers calibrate nozzle fl ow rates at
100 psig.
y 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 3.
Use care when removing or
installing an oil nozzle
A damaged nozzle could cause impaired combustion,
sooting, puffback of hot gases, oil leakage and
potential fi re or asphyxiation hazards.
y Inspect the nozzle adapter to insure that the sealing
surface is not grooved or scratched.
y To insure that the nozzle functions properly, check the
orifi ce and strainer for dirt, scratches or other damage
before installation.
y Do NOT attempt to install or remove a nozzle without
securing the adapter to prevent seriously damaging
the alignment.
y Use care when handling the nozzle line assembly
to prevent changing the electrode tip settings or
damaging the ceramic electrode insulators.
y Ensure that the electrode settings match the values
shown in Figure 2.
D. Exhausting Hazardous Fumes
See warning on this page. Also be conscious of any fumes
produced by the materials that are being heated. Always
ensure adequate ventilation to exhaust all fumes.
E. Low Firing Rate Baffl e.
The low fi ring rate baffl e (See LFRB in Replacement Parts)
reduces the air fl ow and pressure. The LFRB is sometimes
used for fi ring rates under 1.00 gph as listed in Table 1.
Refer to the equipment 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 poor burner performance.
Nozzle Assembly
Maintenance
A. Replace the Burner Nozzle.
1. If applicable, 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 fi nger tighten.
Finish tightening with a 5/8” open-end wrench.
3. If the nozzle is already installed, remove the nozzle
line assembly to verify that the nozzle size and spray
pattern are correct for the application (per equipment
manufacturer’s information). Verify that the electrode
tip settings comply with Figure 2.
B. Check/Adjust Electrodes
Check the electrode tip settings. Adjust if necessary
to comply with the dimensions shown in Figure 2. To
adjust, loosen the electrode clamp screw and slide/rotate
electrodes as necessary. Securely tighten the clamp
screw when fi nished.
C. Igniter Maintenance
The igniter assembly does not require any adjustments
beyond making sure the springs and the burner electrode
rods make solid contact when the igniter is in the closed
position. The sealing surfaces of the gaskets should be
checked and replaced at the fi rst signs of any damage or
deterioration. Clean any dirt or residue from the porcelain
bushings, springs, and baseplate.
The simplest way to check igniter operation is by supplying
voltage to the input and checking to see whether an arc
is produced. Check by either looking or listening to see if
there is an arc across the electrodes while the burner is
running and the igniter is energized.
Figure 2. Electrode Tip Setting
1/4” ABOVE
CENTER
5/32” GAP
1/8” NOZZLE-TO-TIP
SPACING