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125501-01B
22
Note: Pilot flame on natural gas units will have
a slight curve, but flame should be blue and
have no yellow or orange color.
BURNER PRIMARY AIR HOLES
Air is drawn into burner through holes in fit
-
ting at entrance to burner. These holes may
become blocked with dust or lint. Periodically
inspect these holes for any blockage and
clean as necessary. Blocked air holes will
create soot.
MAIN BURNER
Periodically inspect all burner flame holes
with heater running. All slotted burner flame
holes should be open with yellow flame pres
-
ent. All round burner flame holes should be
open with a small blue flame present. Some
burner flame holes may become blocked by
debris or rust, with no flame present. If so,
turn off heater and let cool. Remove blockage,
blocked burner flame holes will create soot.
Figure 32 - Correct Pilot Flame Pattern
Figure 33 - Incorrect Pilot Flame Pattern
Pilot Burner
Thermocouple
Pilot Burner
Thermocouple
INSPECTING BURNERS
Check pilot flame pattern and burner flame
patterns often.
PILOT FLAME PATTERN
Figure 32 shows a correct pilot flame pattern.
Figure 33 shows an incorrect pilot flame pat
-
tern. Incorrect pilot flame is not touching ther
-
mocouple. This will cause the thermocouple
to cool. When thermocouple cools, heater
will shut down.
If pilot flame pattern is incorrect, as shown
in Figure 33
• turn heater off (see
To Turn Off Gas to
Appliance
, page 21.
• see
Troubleshooting
, page 24
