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MAINTENANCE AND CLEANING
FLAME APPEARANCE
Flames from the pilot, front and rear burner should be
visually checked as soon as the heater is installed.
In addition, periodically check the flames visually during
operation.
CHECK THE PILOT FLAME
The pilot flame must always be present when the
heater is in operation. It should just touch the top of the
thermocouple tip for natural gas. Refer to Figure 23 for
correct pilot flame.
If the pilot flame does not touch the thermocouple, then
the main burner cannot function reliably. Refer to Figure
24 for incorrect shape of pilot flame.
CHECK BURNER FLAME APPEARANCE
In normal operation, at full rate after 15 minutes, the flames
should appear as shown in Figure 25.
If logs are installed, the flames should be yellow and should
not impinge on the logs.
Figure 25 Burner Flame Appearance
(Shown with fireglass only)
Monessen • AVFL42 Installation Instructions • 4117-900 Rev. B • 05/20
Thermocouple
for Natural Gas
Figure 23 Correct Pilot Flame Appearance
Thermocouple
for Natural Gas
Figure 24 Incorrect Pilot Flame Appearance
AVFL Vent Free Fireplace
Thermocouple
for LP
Thermocouple
for LP
31
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