Flame Appearance; Pilot Flame; Burner Flame Appearance - MHSC PARLOR VENT-FREE PL20 Installation And Operating Instructions Manual

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. 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 23 for incorrect shape of pilot flame.
MILLIVOLT CONTROL
Thermocouple
for Natural Gas
Thermocouple
for LP
Correct Pilot Flame Appearance
Figure 23 -
Millivolt Control Pilot Flame Appearance
CHECk BURNER FLAME APPEARANCE
In normal operation, at full rate after 15
minutes, the flames should appear as shown
in Figure 24.
The flames should be yellow and extend 3-4"
above the log top surfaces. The yellow flames
should not impinge on the logs.
90D0093
FP7
FP2272
pilot correct flame
Figure 24 -
Correct Burner Flame Appearance
Thermocouple
for Natural Gas
Thermocouple
for LP
Incorrect Pilot Flame Appearance
LG723
PL20 log flames
Parlor Vent Free Fireplace
FP73
FP2273
pilot bad flame
LG73
1