www.desatech.com
119162-01A
23
INSPECTING bURNERS
Check pilot flame pattern and burner flame pat-
terns often.
pILOT FLAME pATTERN
Figure 35 shows a correct pilot flame pattern.
Figure 36 shows an incorrect pilot flame pattern.
The incorrect pilot flame is not touching the
thermocouple. This will cause the thermocouple
to cool. When the thermocouple cools, the heater
will shut down.
If pilot flame pattern is incorrect, as shown in
Figure 36
• turn heater off (see
To Turn Off Gas to Appli-
ance
, page 21
• see
Troubleshooting
, page 25
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.
Figure 35 - Correct Pilot Flame Pattern
Pilot Burner
Thermocouple
Figure 36 - Incorrect Pilot Flame Pattern
Thermocouple
Pilot Burner
FRONT BURNER FLAME PATTERN
Figure 36 shows correct front burner flame pat-
tern. Figure 37 shows incorrect front burner flame
pattern. The incorrect burner flame pattern shows
yellow tipping at top of blue flame.
WARNING: If yellow tipping
occurs, your heater could pro
-
duce increased levels of carbon
monoxide. If front burner flame
pattern shows yellow tipping,
follow instructions at bottom of
this page. Yellow flame on rear
burner is normal.
Figure 37 - Correct Front Burner Flame
Pattern
Figure 38 - Incorrect Front Burner Flame
Pattern
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 front burner flame pattern is incorrect, as shown
in Figure 37
• turn heater off (see
To Turn Off Gas to Appli-
ance
, page 21)
• see
Troubleshooting
, page 25
Yellow Tipping At
Top of Blue Flame
WIRING DIAGRAM
To
Thermopile
To AUTO/OFF/ON
Switch or Remote
Receiver
