Monessen Hearth DIRECT VENT MLDV500 - Manual (Page 51)

75D0004 51
MLDV Series Gas Fireplace
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.
Figure 72 The pilot flame has three distinct flames, one engulfing the
thermopile, one engulfing the thermocouple or sensor, 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.
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.
Figure 73
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 the back holes in the burner are not covered
with rock wool. Replace logs.
NOTE: The type of installation, vent system configuration,
and wind effects may cause the flame patterns to vary.
LG550 Figure 73 -
Burner Flame Appearance
CLEANING and MAINTENANCE
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.
W
ARNING
FP1943
pilot flame
Thermopile
Thermocouple Sensor
FP1943
Figure 72 -
Pilot Flame
FP2453
hooded pilot flames
Sensor
Thermopile
FP453
Signature
Command
System Pilot