Check/Adjust Electrodes; Blower Wheel Replacement - Honeywell r7284 Operator's Manual

FIGURE 9. - GUN ASSEMBLY/STATIC DISK/AIR TUBE
Air Cone
Fuel Nozzle
4. Use a 5/8" open-end wrench to carefully remove
the existing nozzle.
5. Inspect the gun holder assembly before installing
the new nozzle. If it is grooved or scratched on the
sealing surface, replace the gun holder assembly. If
the surface is damaged, oil could leak at the seal-
ing surface causing serious combustion problems.
6. Protect the fuel nozzle and strainer when install-
ing. 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 gun holder assembly. Insert the
nozzle into the gun and secure finger tight. Fin-
ish tightening with a 5/8" open-end wrench. Use
care to avoid bending the air cone, static disk and
electrodes.
8. Do not tighten the nozzle when installing. This will
cause deep grooves in the gun, and prevent a seal
when a new nozzle is installed.
9. Carefully check and realign the electrode tips after
replacing a nozzle to ensure the electrode settings
comply with Figure 10.
10. If the air cone was removed when replacing the
nozzle, carefully reconnect the air cone to the air
tube.
Electrode
Assembly
Gun Holder
Air Tube
Assembly
Section: Perform Regular Maintenance
Electrode Extension Rods
Fuel Line Connector 37° Flare
Check / Adjust Electrodes
Check the electrode tip settings as shown in figure 10.
If necessary, carefully bend the tips with pliers to the
correct setting
FIGURE 10. - ELECTRODE TIP GAP AND SPACING
Electrode Tip
Electrode Tip

Blower Wheel Replacement

For installation or replacement of a blower wheel, in-
sure that there is a space between the blower wheel
and the motor face of 1/4". Refer to Figure 11.
FIGURE 11. - BLOWER ASSEMBLY
KNA Burner Manual 9.801-300.0 rev. 8/13
1/4" Gap between Motor
Face and Edge of Fan
19