Desa VF-24N-BTB - Manual (Page 18)

www.desatech.com 111826-01G 18
INSPECTING BURNERS
Check pilot flame pattern and burner flame pat-
terns often.
PILOT FLAME PATTERN
Figure 20 shows a correct pilot flame pattern.
Figure 21 shows an incorrect pilot flame pattern.
The incorrect pilot flame is not touching the
thermocouple. When the thermocouple cools, the
heater will shut down.
If pilot flame pattern is incorrect, as shown in
Figure 21
• turn heater off (see To Turn Off Gas to Appli-
ance, above or page 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 21 - Incorrect Pilot Flame Pattern
(Your Pilot May Differ from Pilots Shown)
Figure 20 - Correct Pilot Flame Pattern
(Your Pilot May Differ from Pilots Shown)
BURNER FLAME PATTERN
Figure 22 shows correct 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 burner flame pattern is incorrect, as shown in
Figure 23
• turn appliance off (see To Turn Off Gas to Ap-
pliance, page 17
• see Troubleshooting, page 20
Pilot Burner
Thermocouple
Thermocouple
Pilot Burner
Thermocouple
Thermocouple
Figure 22 - Correct Burner Flame Pattern
Figure 23 - Incorrect Burner Flame
Pattern
Yellow Flames
with Orange
Streaks
Dark Orange
Flames