INSPECTING BURNERS

Pilot Flame Pattern

Burner Flame Pattern

Burner Primary Air Holes

Main Burner

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INSPECTING BURNERS

Check pilot flame pattern and burner flame patterns often.

PILOT FLAME PATTERN

Figure 37 shows a correct pilot flame pattern. Figure 38 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 38

turn heater off (see To Turn Off Gas to Appliance, page 17)

see Troubleshooting, pages 22 through 24

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.

Pilot Burner

Pilot Burner

Thermocouple

 

 

 

Thermocouple

 

Natural Gas

Propane/LP Gas

Figure 37 - Correct Pilot Flame Pattern

BURNER FLAME PATTERN

Figure 39 shows a correct burner flame pattern. Figure 40 shows an incorrect burner flame pattern. If burner flame pattern is incorrect,

turn heater off (see To Turn Off Gas to Appliance, page 17)

see Troubleshooting, pages 22 through 24

Approx. 3-6"

Above Top of

Logs

Figure 39 - Correct Flame Pattern with Control Knob Set to High Flame.

More Than

8" Above

Top of Logs

Pilot Burner

Pilot Burner

 

 

Thermocouple

Thermocouple

Natural Gas

Propane/LP Gas

Figure 38 - Incorrect Pilot Flame Pattern

Figure 40 - Incorrect Flame Pattern with Control Knob Set to High Flame

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 heater 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 heater and let cool. Remove blockage, blocked burner flame holes will create soot.

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Desa VI33NR VI33PR Inspecting Burners, Pilot Flame Pattern, Burner Flame Pattern, Burner Primary AIR Holes, Main Burner