Monessen Hearth Direct Vent Gas Fireplace MDV500 - Manual (Page 42)

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Figure 60 - Pilot Flame
Thermopile
Thermocouple
BURNER FLAME
The flames from the burner should be visually checked
as soon as the heater is installed and periodically during
normal operation. In normal operation, at full rate, and
after operating for about 15 to 30 minutes, the flame
should be yellow and slightly taller than the rear log. See
Figure 61.
If the flame is blue and only in the center, turn off unit
and let cool. After unit is cool, remove logs and check to
make sure rock wool is placed correctly. Replace logs.
NOTE: The type of installation, vent system
configuration, and wind effects may cause the
flame patterns to vary.
Figure 61 - Burner Flame Appearance
CLEANING AND MAINTENANCE
BURNER, PILOT AND CONTROL COMPARTMENT
Keep the control compartment, logs, and burner areas surrounding the logs clean
by vacuuming or brushing at least twice a year. Make sure the burner porting,
pilot air opening and burner air opening are free of obstructions at all times.
PILOT FLAME
The flames from the pilot should be visually checked as soon as the heater is
installed and periodically during normal operation. The pilot flame must always
be present when the fireplace is in operation. See Figure 60. The pilot flame
has three distinct flames, one engulfing the thermopile, one engulfing the ther-
mocouple, and the other reaching to the main burner..
BURNER
Inspect area around the injector. Remove any lint or foreign material with a
brush or vacuum.
WARNING
Turn off gas before servicing fireplace. It is recommended
that a qualified service technician perform these check-ups
at the beginning of each heating season