Desa GA3700 - Manual (Page 23)

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Figure 38 - Correct Pilot Flame Pattern
(Natural Gas Pilot Shown)
Figure 39 - Incorrect Pilot Flame Pattern
(Natural Gas Pilot Shown)
Pilot Burner
Thermocouple
Pilot Burner
Thermocouple
INSPECTING bURNER
BURNER pRIMARY AIR HOLES
Air is drawn into the burner through the holes
in the fitting at the burner entrance. These
holes may become blocked with dust or lint.
Periodically inspect these holes for any block-
age and clean if needed. Blocked air holes
will create soot.
Figure 40 - Correct Burner Flame Pattern
Yellow Tipping
Figure 41 - Incorrect Burner Flame
Pattern
MAIN BURNER
Periodically inspect all burner flame holes with
the fireplace running. All slotted burner flame
holes should be open with yellow flame pres-
ent. All round burner flame holes should be
open with a small blue flame present. Some
burner flame holes may become blocked by
debris or rust, with no flame present. If so, turn
off fireplace and let cool. Remove blockage.
Blocked burner flame holes will create soot.
BURNER FLAME pATTERN
WARNING: If yellow tipping
occurs, your fireplace could pro-
duce increased levels of carbon
monoxide.
NOTICE: Do not mistake orange
flames with yellow tipping. Dirt
or other fine particles enter the
fireplace and burn causing brief
patches of orange flame.
Figure 40 shows a correct burner flame pat-
tern. Figure 41 shows an incorrect burner
flame pattern. The incorrect burner flame
pattern shows the flame higher consistently
higher than 1" above the logs.
If burner flame pattern is incorrect, as shown
in Figure 41
• turn heater off (see To Turn Off Gas To
Appliance, page 20)
• see Troubleshooting, page 25
Check pilot flame pattern and burner flame
patterns often.
pILOT FLAME pATTERN
Figure 38 shows a correct pilot flame pattern.
Figure 39 shows an incorrect pilot flame pat-
tern. The incorrect pilot flame is not properly
heating the thermocouple. When the thermo-
couple cools, the heater will shut down.
If pilot flame pattern is incorrect, as shown
in Figure 39
• turn heater off (see To Turn Off Gas to Ap-
pliance, page 20)
• see Troubleshooting, page 25
Note: The pilot flame on a natural gas units will
have a slight curve, but flame should be blue
and have no yellow or orange color.