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ADJUSTMENTS
Important Note:
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2
Excessive gas line pressure drop and/or burner manifold
pressure too low may cause burner start /operate with
excessive noise!
ADJUSTMENT PROCEDURE FOR FIRE-RATE, LOW
NOX AND HIGH ELEVATION (Fine-Tune)
Never set burner combustion too lean (causing noisy operation)
or too rich (causing combustion chamber premature failure)
see Table 3 for proper settings.
Never set the air damper outside of its adjustment range
of the rated fire rate unless authorized by an A. O. Smith
Service Center.
Important Note:
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2
If the O
If the O
UNDER NO CIRCUMSTANCES SHOULD THE INPUT RATE
EXCEED THE INPUT RATE SHOWN IN THE HEATER RATING
PLATE. OVERFIRING COULD RESULT IN DAMAGE OR
SOOTING OF THE HEATER.
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or O
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