Desa 10542 - Manual (Page 18)

www.desatech.com 113680-01A 18
BURNER FLAME PATTERN
WARNING: If yellow tipping
occurs, your heater could pro-
duce increased levels of carbon
monoxide.
NOTICE: Do not mistake orange
flames with yellow tipping. Dirt
or other fine particles enter the
heater and burn causing brief
patches of orange flame.
Figure 25 shows a correct burner flame pattern.
Figure 26 shows an incorrect burner flame pat-
tern. The incorrect burner flame pattern shows
yellow tipping of the flame. It also shows the flame
higher than 1/2 the glass panel height.
If burner flame pattern is incorrect, as shown in
Figure 26
• turn heater off (see To Turn Off Gas To Appli-
ance, page 16 or 17)
• see Troubleshooting, page 20
1/2 G
1/2 G
INPECTING HEATER
Check pilot flame pattern and burner flame pat-
tern often.
PILOT FLAME PATTERN
Figure 23 shows a correct pilot flame pattern. Fig-
ure 24 shows an incorrect pilot flame pattern. The
incorrect pilot flame is not touching the thermo-
couple. 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 Fig-
ure 24
• turn heater off (see To Turn Off Gas to Appli-
ance, page 16 or 17)
• see Troubleshooting, page 20
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 24 - Incorrect Pilot Flame Pattern
Figure 23 - Correct Pilot Flame Pattern
Thermocouple
Pilot Burner
Pilot
Burner
Thermocouple
Blue Flame
Yellow Flame
Figure 25 - Correct Burner Flame Pattern
Yellow
Tipping
Figure 26 - Incorrect Burner Flame
Pattern
1 /
2
Glass
Height
1 /
2
Glass
Height
Blue
Flame