Inspecting burners – Desa LMFP33NR User Manual

Page 20

111604-01D

For more information, visit www.desatech.com

Figure 38 - Correct Pilot Flame Pattern

Figure 39 - Incorrect Pilot Flame Pattern

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 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 39

• turn heater off (see To Turn Off Gas to Appliance, page 18)

• see Troubleshooting, pages 22 through 24

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.

INSPECTING BURNERS

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 run-
ning. 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.

Pilot Burner

Thermocouple

Pilot Burner

Thermocouple

Pilot Burner

Thermocouple

INSPECTING BURNERS

Pilot Flame Pattern
Burner Primary Air Holes
Main Burner
Burner Flame Pattern

Pilot Burner

Natural Gas Pilot

Propane/LP Gas Pilot

Natural Gas Pilot

Propane/LP Gas Pilot

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.

WARNING: If yellow tipping occurs, your fireplace

could produce increased levels of carbon monoxide.

BURNER FLAME PATTERN

Figure 40 shows a correct burner flame pattern. Figure 41 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 41

• turn heater off (see To Turn Off Gas To Appliance, page 18)

• see Troubleshooting, pages 22 through 24

Figure 40 - Correct Burner Flame Pattern

Yellow Tipping

Figure 41 - Incorrect Burner Flame Pattern