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7) Measure the oil pump pressure. If required, adjust it to deliver the
appropriate pressure for the burner. The oil pump should be set to produce,
• 130 PSIG, for the R.W. Beckett model AF burner
• 175 PSIG, for the R.W. Beckett model NX burner
8) Carbon Dioxide (CO
proper and safe combustion is taking place, carbon dioxide and carbon
monoxide measurements must be taken. A CO
Table 1 with no measurable CO is desirable. The maximum acceptable CO
reading is about 50 PPM. If the CO reading is too high, open the burner air
shutter, or air band, slightly to permit more combustion air to the flame.
Recheck the CO level and adjust as required.
9) Draft – Draft measurements should be taken through the overfire port and in
the vent connector, not more than 12 inches away from the furnace outlet. A
5/16 in. hex washer head bolt plugs the overfire port in the burner mounting
plate. Remove the bolt and insert a suitable draft measurement gage. After
the chimney (or stack gas passageway) has warmed up to operating
temperature, approximately 15 to 20 minutes of burner operation, adjust the
barometric damper to obtain the correct overfire draft reading. The overfire
draft should read 0.02 in. W.G. The draft measured at the flue (stack draft)
should read no more than 0.05 in. W.G.
NOTICE: The overfire draft is the more important measurement and
should be used to adjust the setting of the barometric draft control.
10) Flue Gas Temperature – The flue gas temperature will vary depending on
heat input rate, air temperature rise across the heat exchanger, and air
flowrate through the furnace. To prevent excessive water vapor condensation
from the flue gases, the gross flue gas temperature should not fall below
330ºF. In addition, if the gross flue gas temperature exceeds 650ºF, the
heating efficiency of the furnace will be reduced.
To reduce high flue temperatures, after properly adjusting the burner, check
for blocked supply/return airflow. Remove any blockages, increase fan
speed, or consider reducing the furnace heat input rate. Also, verify there is
no air leakage into the combustion chamber from around the burner mounting
flange or heat exchanger mounting plate. If flue gas temperatures are too low,
consider increasing the heat input rate or reducing the amount of
supply/return airflow.
11) Cycle the furnace several times to verify the burner lights off and shutsdown
smoothly without excessive noise or smoke production.
) and Carbon Monoxide (CO) – In order to assure that
2
20
reading within the limits of
2
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