Bradford White TW4-75S-76B-3X - Manual (Page 36)

36
Burner Flame Check
Cast Iron Burner: At the time of installation and at periodic intervals (not more
than 6 months), a visual check of the main burner and pilot flames should be
made to determine if they are burning properly. For ideal operation, the gas
and air must be properly proportioned. The proper air-gas mixture is obtained
by adjusting the air shutter on the mixer face of the main burner (See Figure
14). To adjust for proper burning, loosen the air shutter nut (if provided), rotate
shutter to close the opening in the burner then slowly rotate the shutter until the
yellow tips disappear and the flame becomes blue. On 75 gallon models fired
on LPG or propane, adjust the air shutter as described above until the yellow
flame is minimized (note-the burner flame may contain a mixture of yellow and
blue). Tighten the air shutter nut. Too much air will cause the flame to lift off
the burner ports and create noisy operation. Too little air will result in soot
formation. The main burner flame should light smoothly from the pilot.
Steel Burner: These models are equipped with self adjusting air mixture and
do not have an adjustable air shutter (See Figure 14). 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 14
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