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5. If pilot light goes out, repeat step 4.
6. When pilot remains lit, fully open main burner valve. Do this by turning valve
handle to the HIGH position. You can now position the handle to any setting
between HIGH and LOW.
CAUTION
Only use the main burner valve handle to adjust the burner
flame. Always turn handle pointer to the HIGH position
before turning it to a lower position. Never set handle
pointer between the LOW and OFF positions.
HIGH
LOW
OFF
INDICATOR
Slight Yellow Coloring
on Flame Ends
Blue Flame
Correct Flame Pattern
Burner
Tube
Figure 5 - Normal Flame Pattern at High Position
CAUTION
Running heater below specified input rating may cause
flashback. During flashback, the burner flame is mostly
yellow. The flame will burn inside the burner tube, causing a
roaring noise. If flashback occurs, turn heater off. After
burner tube cools, restart the heater.
Flame Patterns
Figure 5 shows a correct flame pattern. The burner flame is mostly blue with a
slight yellow coloring on the ends.
Figure 6 shows an incorrect flame pattern. The flame is mostly yellow. The
incorrect flame pattern results from running heater below the LOW position or
from flashback.