www.fmiproducts.com
126425-01B
20
INSPECTING BURNERS
Check pilot flame pattern and burner flame
patterns often.
PILOT FLAME PATTERN
Figure 20 shows a correct pilot flame pattern.
Figure 21 shows an incorrect pilot flame pat
-
tern. The incorrect pilot flame is not touching
the thermocouple. This will cause the thermo-
couple to cool. When the thermocouple cools,
the heater will shut down.
If pilot flame pattern is incorrect, as shown
in Figure 21
• turn heater off (see
To Turn Off Gas to Ap-
pliance
, page 19
• see
Troubleshooting
, page 23
Note: The pilot flame on natural gas units will
have a slight curve, but flame should be blue
and have no yellow or orange color.
BURNER FLAME PATTERN
Figure 22 shows correct burner flame pattern.
Figure 23 shows incorrect burner flame pat
-
tern. The incorrect burner flame pattern shows
dark orange flame.
WARNING: This burner is
designed to burn with a bright
yellow flame. The flame will
have a blue base.
If burner flame pattern is incorrect, as shown
in Figure 23
• turn heater off (see
To Turn Off Gas to Ap-
pliance
, page 19
• see
Troubleshooting
, page 23
Figure 22 - Correct Front Burner Flame
Pattern
Figure 23 - Incorrect Front Burner Flame
Pattern
Dark Orange
Flames
Figure 20 - Correct Pilot Flame Pattern
Figure 21 - Incorrect Pilot Flame Pattern
Pilot Burner
Thermocouple
Thermocouple
Pilot Burner
Bright Yellow
Flames with a
Blue Base
