Lennox International Inc. o23v - Manual (Page 17)

Page 17
C−Safety or Emergency Shutdown
Turn off unit power. Close all shut-off valves in the oil sup-
ply line.
D−Extended Period Shutdown
Turn off thermostat or set to UNOCCUPIED" mode.
Close all shut-off valves in the oil supply line to guarantee no
oil leaks into burner. Turn off all power to unit. All access
panels, covers and vent caps must be in place and se-
cured.
IV−HEATING SYSTEM SERVICE CHECKS
A−Oil Piping
All oil supply piping (factory and field) must be carefully
checked for oil leaks.
B−Electrode Adjustment
When adjusting the electrode, use the AFII multipurpose
gauge (Beckett part # T−500) available from Beckett.
To set the electrode tip gap spacing, position the gauge as
shown in figure 15. Align the center mark with the nozzle
and adjust the electrodes to the two outer marks (1/8"
[3mm] to 1/16" [2mm] minimum).
FIGURE 15
AFII ELECTRODE TIP
GAP
To position the electrode tips beyond the face of the nozzle
and above the center line, position the gauge as shown in
figure 16. Align the center mark with the nozzle and adjust
the electrodes to the AC cross marks.
FIGURE 16
AFII ELECTRODE POSITIONING
To check that the nozzle is approximately centered with
the head inside diameter, align the center mark of the
gauge with the center of the nozzle orifice, as shown in
figure 17, and move the gauge from side to side at sev-
eral points. Be careful not to scratch the nozzle sur-
face.
The Z" or zero dimension is important because it locates the
nozzle for the precise relationship with the combustion head.
To set the Z" dimension, position the gauge as shown in fig-
ure 17 and loosen the nozzle line electrode assembly so that
it can be moved forward or backward in the air tube until the
nozzle becomes flush against the gauge. Tighten the nozzle
line escutcheon plate screw (shown in figure 17) to lock this
Z" dimension securely.
FIGURE 17
AFII NOZZLE CENTERING
C−Pressure Check
The O23V is not equipped with a gauge port. Install a
pressure gauge in the nozzle port or bleeder port. See
figure18. The pump is factory set at 100 psig (689.5 kPa)
for the O23V−70 and 140 psig (965.3 kPa) for all other
O23V units but is adjustable . Never operate the pump in ex-
cess of 10 psig (69 kPa) above set point. Average nozzle
cutoff pressure is 80 psig (551.6 kPa). Use the same
gauge in the nozzle port to check cut−off pressure. To do
so run the burner for a short period and then turn off. The
gauge will show cutoff pressure.