Oil Furnace Installation Manual
Table Of Contents
506793-02BPage 12 of 16 Issue 1810
Furnace
Model
Burner
Head
Nozzle /
Angle
Spray
Pattern
Pump
Pressure
57 * FO .50 GPH/80° DELAVAN A 100 PSI
72 * FO .65 GPH/80° DELAVAN B 100 PSI
84 * F3 .65 GPH/80° DELAVAN B 140 PSI
95 * F3 .75 GPH/80° DELAVAN B 140 PSI
112 F4 .85 GPH/80° DELAVAN B 140 PSI
125 F4 1.00 GPH/80° DELAVAN B 140 PSI
* Denotes low re bafe installed. See oil burner specication
included with instructions.
Table 2.
To adjust the burner:
1. Punch a 5/16” diameter service hole in the ue
outlet. This sampling hole should be at least two
ue diameters above the breeching, or elbow at the
breeching, but ahead of the barometric damper.
2. Operate burner, adjust air setting for good ame by
visual observation, and run for at least 10 minutes
or until operation has stabilized. A good ame will be
entirely contained in the combustion chamber and
will be predominantly yellow-white in color. As ame
quality lessens, the ame will turn more orange in color
and will start to rise above the combustion chamber.
3. Take a draft reading at the service hole. Adjust
barometric draft control in the stack to achieve an
overre draft of –.01” to –.02” and a breach of –.02”
to –.04”.
4. Pull and record a smoke reading at the service hole
using an industry standard smoke tester. If smoke
is evident, it could be caused by a poor nozzle
or combustion setting. In some cases, it may be
caused by difference in oil or an unusual condition of
installation.
5. If the burner is producing more than #1 smoke, loosen
the air control adjustment screw and rotate the band
until the ame appears clean.
6. Reset the draft if the combustion head or air settings
were adjusted (see Step 3).
7. Using a suitable test instrument for CO
2
, take and
record a CO
2
reading at the service hole. The CO
2
measured in the stack should be a minimum of 11%
CO
2
.
8. Using a suitable thermometer, obtain and record the
ue gas temperature at the service hole.
9. Use the CO
2
reading and the ue gas temperature
reading to determine unit efciency.
10. When the proper combustion and smoke readings
have been achieved, tighten the air adjustment screw.
11. Recheck the draft, smoke, combustion, and ue gas
temperature.
Figure 11. Beckett Oil Burner Nozzle Adjustment
Burner must be removed from
furnace for this procedure.
To adjust nozzle:
1. Loosen screw.
2. Slide entire nozzle/electrode assembly back and forth
until nozzle just touches gauge.
Nozzle and Electrode Alignment
Proper nozzle and electrode depth and alignment are
essential for proper burner operation. Figure 11 shows the
proper adjustment procedure using the Beckett “T” gauge.
To check and adjust the nozzle depth:
1. Insert the small end of the “T” gauge into the end of the
cone and measure from the at of the end cone to the
tip of the nozzle. The proper measurement should be
1.13”. When the depth is correct, the tip of the nozzle
should just touch the base of the “T” gauge.
2. Nozzle adjustments are made by sliding the entire
nozzle assembly forward or backward within the blast
tube (see Figure 11).
To check nozzle alignment:
1. Insert the small end of the “T” gauge into the end of the
cone and measure the nozzle and electrode alignment
against the center lines marked on the gauge.
2. If the nozzle is not centered, but found to be too far
left or right, a new nozzle will need to be ordered. Do
not attempt to adjust by bending the 90° elbow in the
oil line.
Sequence of Operation
1. The thermostat calls for heat, activating the burner
motor and ignitor.
2. After a 15-second pre-purge period, the oil solenoid
valve is energized and ignition is established.
3. After thermostat is satised, thermostat circuit will
open.