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, pages 20 through 24 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
Blue Flame
Pilot Burner
Figure 23 - Correct Pilot Flame Pattern
Thermocouple
Yellow Flame
Pilot
Burner
Figure 24 - Incorrect Pilot Flame Pattern
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, pages 20 through 43
Blue |
Flame |
1/2 Glass |
Height |
Figure 25 - Correct Burner Flame Pattern
Yellow
Tipping
1/2 Glass
Height
Figure 26 - Incorrect Burner Flame
Pattern
18 | www.desatech.com |
