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Unit Adjustments
Neither the nozzle setting nor the air adjustments are factory
set. The furnace is fire−tested and the limit control is checked
to make sure it functions properly; no factory settings are
made. During installation, the furnace must be set up. The
installing dealer/contractor must have and use proper test
equipment in order to correctly set up the oil furnace. Proper
testing equipment is required to ensure correct operation of
the unit. The use of test equipment is now more critical than
ever due to tighter tolerances needed to keep the furnace
operating efficiently.
Among the test equipment for an oil furnace, the proper
combustion test kit should contain the following:
Draft gauge
CO
2
or O
2
analyzer
Smoke tester
Pressure gauge
High temperature thermometer
Oil vacuum gauge
Beckett T−500 gauge
Knowledge of proper test equipment operation
CAUTION
Improper nozzle and/or air adjustment of this unit
may result in sooting problems. Refer to the follow-
ing set-up section for correct adjustment proce-
dures.
Adjusting the Nozzle
Proper adjustment of the nozzle assembly is critical be-
cause alignment may have changed during shipping. Be-
fore the furnace and oil lines are installed, the nozzle as-
sembly must be checked. This may easily be done by
removing the entire burner assembly (not just the nozzle)
from the furnace. The lower firing nozzle is factory installed.
This should be verified by the installer. Inspect the spark
transformer leads also to ensure they are still attached to
the electrodes.
The burner assembly is attached to the vestibule panel by
three nuts. Slots are provided in the mounting flange for re-
moving the burner assembly from the vestibule. By loosen-
ing the nuts and by turning the whole burner assembly
counterclockwise (figure 5), the entire burner assembly will
come out of the furnace. There is adequate wire to remove
the burner without disconnecting wires. Once removed,
just turn the burner around in the vest panel area.
Figure 5
OHR23 Series Burner Removal
Loosen three nuts which at
tach burner to vest panel.
Rotate burner counterclockwise on
slots then pull toward you.
To correctly adjust the nozzle, use a Beckett #T−500 gauge.
Insert the small end of the gauge into the end of the cone
and measure from the flat of the end cone to the tip of the
nozzle. When nozzle depth is correct, the tip of the nozzle
should just touch the end of the gauge. Refer to the illustra-
tion sheet provided with the gauge. Note that the scale side
of the gauge is not used for this purpose. Make corrections
by sliding the nozzle assembly forward or backward within
the blast tube (figure 6). At the same time, check the nozzle
alignment.
To check nozzle alignment, again insert the small end into
the end cone and measure the nozzle and electrode align-
ment against the center lines marked on the gauge (again
refer to enclosed illustration sheet). If the nozzle is not cen-
tered, but found to be too far left or right, a new nozzle as-
sembly will need to be ordered. Do not attempt to adjust by
bending the 90 degree elbow in the oil line.
Figure 6
Beckett Oil Burner Nozzle Adjustmen
t
Burner must be removed from
furnace for this procedure.
GAUGE
1 Loosen screw.
2 Slide entire nozzle/electrode assembly back and forth until
nozzle just touches gauge.
1
2
