Desa LMFP33PR(A) Inspecting Burners, Pilot Flame Pattern, Burner Primary AIR Holes, Main Burner

INSPECTING BURNERS

Check pilot flame pattern and burner flame pat- terns often.

PILOT FLAME PATTERN

Figure 39 shows a correct pilot flame pattern. Figure 40 shows an incorrect pilot flame pattern. The incorrect pilot flame is not properly heating the thermocouple. When the thermocouple cools, the heater will shut down.

If pilot flame pattern is incorrect, as shown in Figure 40

•turn heater off (see To Turn Off Gas to Appli- ance, page 21)

•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.

Thermocouple Pilot Burner

Propane/LP Gas Pilot
Pilot Burner	Thermocouple

Natural Gas Pilot

Figure 39 - Correct Pilot Flame Pattern

Pilot Burner

Thermocouple

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 blockage and clean if
needed. Blocked air holes will create soot.
MAIN BURNER
Periodically inspect all burner flame holes with the
fireplace running. All slotted burner flame holes
should be open with yellow flame present. 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
produce	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 41 shows a correct burner flame pattern. Fig-
ure 42 shows an incorrect burner flame pattern. The
incorrect burner flame pattern shows the flame higher
consistently higher than 1 inch above the logs.
If burner flame pattern is incorrect, as shown in
Figure 42

•turn heater off (see To Turn Off Gas To Appli- ance, page 21)

•see Troubleshooting, page 25

Propane/LP Gas Pilot
Pilot Burner	Thermocouple

Figure 41 - Correct Burner Flame Pattern

Yellow Tipping

Natural Gas Pilot

Figure 40 - Incorrect Pilot Flame Pattern

Figure 42 - Incorrect Burner Flame Pattern

111604-01L www.desatech.com 23