www.fmiproducts.com
111826-04E
20
Thermocouple
Figure 21 - Incorrect Pilot Flame Pattern
(Natural Gas Pilot Shown)
BURNER FLAME PATTERN
Figure 22 shows correct burner flame pat
-
tern.
NOTICE: Do not mistake orange
flames with yellow tipping. Dirt
or other fine particles are burned
by heater, causing brief patches
of orange flame.
If burner flame pattern is incorrect, as shown
in Figure 23
• turn appliance off (see
To Turn Off Gas to
Appliance
, page 18 or 19)
• see
Troubleshooting
,
page 22
Figure 22 - Correct Burner Flame Pattern
Figure 23 - Incorrect Burner Flame Pattern
Yellow Tipping
at Top of Blue
Flame
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. 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 18 or 19)
• see
Troubleshooting
, page 22
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
.
Thermocouple
Figure 20 - Correct Pilot Flame Pattern
(Natural Gas Pilot Shown)
