Lp And Natural Gas Supplies; Air Shutter Adjustment - Lennox FIRESTAR MERIT GC3 Installation And Operation Manual

Propane (LP) and Natural Gas Supplies
Your Firestar™ gas insert is equipped from the factory for use with
natural gas only as specified on the Safety / Listing label attached to the
appliance. This appliance can only be operated using propane gas (LP)
if a certified fuel conversion kit provided by Lennox Hearth Products is
installed by a qualified service technician.
Also check the orifice size on the label attached to your control panel. It
must be the correct size for the fuel and altitude.
Do not run propane tank dry. Running the tank dry may cause
a hazardous condition due to pressure drop in empty tank.
Solid fuel is NOT to be used with this unit.

Air Shutter Adjustment

The main burner has an adjustable air shutter located at the end of the
burner as it inserts over the orifice. It is located behind the right side
door and beneath the control valve. The shutter adjustment has been
set at the factory to ensure proper, safe combustion and flame pattern.
Only a qualified gas technician should adjust the air shutter as an incor-
rect adjustment could cause a hazardous condition. Closing the air
shutter will cause the flames to take on a yellow color. Closing it too far
will cause improper burning and the flames will turn orange and sooty.
Opening the air shutter will cause the flames to burn cleaner; becoming
transparent and bluish.
CAUTION: The air shutter should never be closed to such an
extent to create sooting on the viewing glass, logs or heat
exchanger. If soot begins to form after burning, the air shutter
should be opened gradually until the sooting condition stops.
Open the shutter a small amount at a time until the sooting
ceases. See "Flame Color and Behavior" and "Maintenance",
proper pilot flame.
1. Remove glass door (see Glass Door Removal on Page 20). Carefully
remove the log set and set aside.
2. Using a 5/32" allen wrench, remove the allen-head screw on the left
side of the air control panel as shown in Figure 15a, then lift out air
control panel as shown in Figure 15b.
3. Using a 5/32" allen wrench, remove the screw which secures burner
tube assembly as shown in Figure 15c. Then lift out burner tube as-
sembly as shown in Figure 15d.
4. Using a phillips screwdriver, loosen the air shutter setscrew just
enough so air shutter can be rotated by hand (read note below). See
Figures 15e and 15f.
5. Reinstall components by reversing steps 1 - 4.
6. Locate the air shutter, behind the right side access door (below valve),
then adjust the air shutter gap until the proper flame characteristics
are achieved.
Note: The setscrew for the air shutter is secured tightly from the factory
so that it does not rotate from the factory setting during shipping. Once
you loosen the setscrew just enough so that it can be rotated by hand,
then reinstall the burner tube, you will be able to access and adjust the
air shutter from behind the right side panel (below valve).
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Remove Allen-Head Screw
Figure 15a
Lift Out Air Control Panel
Figure 15b
Figure 15c
Lift Out Burner Tube Assembly
Figure 15d
Setscrew
Air Shutter
Figure 15e
Firebox
Air Control Panel
Remove Allen-Head Screw
Burner Tube Assembly
Air Shutter
Figure 15f
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