Bosch HDI7282U Installation Instructions Manual page 26

Yellow Flames:
Further adjustment is required.
Yellow Tips on Outer Cones:
Normal for LP Gas.
Soft Blue Flames:
Normal for Natural Gas.
If the flame is completely or mostly yellow, verify that the regulator is set for the
correct fuel. After adjustment, retest.
Some yellow streaking is normal during the initial start-up. Allow unit to
operate 4-5 minutes and re-evaluate.
When correct color, carryover and size are verified, installation is complete.
Figure 24: Checking Flame Characteristics
Installation
English 23