Bradford White M-I-MH40T6FLX - Manual (Page 21)

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General Operation continued-
Burner Flame Check
Steel Burner: These models are equipped with self adjusting air mixture and
do not have an adjustable air shutter (See Figure 3). At periodic intervals, a
visual check of the main burner and pilot flames should be made to determine
if they are burning properly. The main burner flame should light smoothly
from the pilot.
Figure 3
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