Bradford White U-2-TW-75T6RN - Manual (Page 2)

2
BURNER FLAME CHECK (Replaces pg. 32 of instruction manual)
These models are equipped with self-adjusting air mixture and do not have an
adjustable air shutter. 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. The burner flame
should be soft and undefined. After five minutes of burner operation the
burner face should be glowing orange and emitting an orange flame.
Figure 2