INSPECTING HEATER
Check pilot flame pattern and burner flame pat- tern often.
PILOT FLAME PATTERN
Figure 23 shows a correct pilot flame pattern. Figure 24 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 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.
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 pattern. The incorrect burner flame pattern shows yellow tipping of the flame. It also shows the flame higher than 1/2 the heat shield 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
| Blue | |
| Flame | |
| /2 | Heat |
1 | Shield | |
|
| Height |
Figure 25 - Correct Burner Flame Pattern | ||
|
| Yellow |
|
| Tipping |
| /2 | Heat |
1 | Shield | |
|
| Height |
Figure 26 - Incorrect Burner Flame | ||
Pattern |
|
|
18 | www.desatech.com |
