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k. CARBON DIOXIDE (CO
2
) OR OXYGEN (O
2
): Take a CO
2
sample from flue passageway. It is
possible to achieve readings of up to 14% CO
2
(or 2% O
2
), but it is recommended to have a
lower CO
2
(or higher O
2
) reading with zero smoke measured. To achieve a lower CO
2
reading,
open the air plate on the burner until zero smoke is measured. A CO
2
of 11-1/2% is
recommended.
For example, if a 13% CO
2
(or 3.5% O
2
) is recorded at a trace of smoke, open the air shutter
until zero smoke is measured with a 11-1/2% CO
2
(or 4.5 O
2
).
Adjustment of the burner to achieve a slightly lower CO
2
reading is recommended, although it
slightly reduces combustion efficiency, to keep the heating system within normal operating
conditions though external conditions may vary. Some “out-of- spec” conditions which may
adversely affect burner performance are, low oil supply temperature, dirty (contaminated) oil, low
heating content (BTU/gal) oil, cold heat exchanger surfaces, and downdraft conditions. By
adjusting the burner in this manner, an operational tolerance is established by allowing the
burner to function well, even under less than ideal conditions. This results in less service and
maintenance during a heating season.
l. Removing the draft over fire cap allows for flame inspection and over fire pressure
measurement. The over fire pressure will be negative and will vary depending on the final
combustion set-up. If the over fire pressure is positive, shut down the burner and make certain
the inducer is operating and that the vent system meets the installation requirements on page 9
and 10.
m. Temperature rise is equal to the supply air temperature minus return air temperature. Under
steady state operating conditions, the temperature rise across the heating section should be
approximately between 55
0
F and 85
0
F. A higher temperature rise will slightly lower the heating
efficiency.
The supply air temperature should be measured in the supply air trunkline approximately 12 inches
downstream of the supply air outlet of the appliance.
NOTICE: Minimum temperature rise is 55
0
F.: maximum temperature rise is 85
0
F.
NOTICE: Minimum return air temperature is 55
0
F.
n. After final adjustments are completed, tighten all screws to fix the positions of the burner air
band and replace the plastic plug.
o. Check for the presence of oil leaks. Correct any leaks found.
p. Reassemble the burner compartment cover and replace the draft pipe cap.
q. Start and stop the unit several times while checking for proper ignition of the burner. The
flame should ignite and stabilize without any significant rumbles or pulsations.