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106442
MDVFST DIRECT-VENT GAS FIREPLACE
®
ADJUSTING AIR SHUTTER
The air shutter, located at the underside of the
main burner (see Figure 59), has been factory
preset to the proper air-to-gas ratio which
results in an even, clean burning flame across
the burner (see Figure 60). If readjustment is
necessary, you can restore the proper air-to-
gas ratio by loosening the air shutter screw
and rotating the air shutter until the proper
flame setting is achieved (the shutter's nor-
mal setting for propane/LP gas is fully open
and approximately 5/16" opening for natu-
ral gas). Do not forget to retighten the air
shutter screws.
Figure 60 - Burner Flame Patterns
CORRECT
INCORRECT
CLOSE
SHUTTER
INCORRECT
OPEN
SHUTTER
Short, Sharp,
Blowing Flame
Long, Blue Flame
with Yellow Tips
Long, Uneven,
Yellow Flame
Figure 59 - Connecting Venturi and Orifice
Air Shutter
Orifice
Burner
Firebox Bottom
Venturi
Tube
Burner Gas Line
ON
T
O
I
P
L
OFF
Figure 58 - Valve
Stem
Conversion
Screw
Top
SIT Nova
Millivolt Valve
INSTALLATION
INSTRUCTIONS
FOR CONVERSION
NATURAL TO
PROPANE/LP
Continued
The SIT Nova millivolt valve converts from
natural gas to propane/LP gas with the re-
versal of the conversion screw located on
the stem in the top of the valve (see Figure
58). The valve is located in the bottom of the
fireplace underneath the firebox.
Remove the conversion screw from the valve
and rotate the screw 180 degrees. The screw
is clearly marked as NG or LPG, insure that
the LPG is facing outward. Tighten the
screw fully but do not over tighten.
Position the hearth pan and the two side
refractories back into position in the com-
bustion chamber and fasten the burner back
into position with the two screws.
Carefully position the grate and logs back
into position (see Installing Log Set, page
17). Be careful not to alter the pilot or burner
location.
Close the glass door, making certain the
door is fully sealed.
Replace the louvers by depressing the latches
and inserting the pins into the mating holes
on the front face.
The conversion from natural gas to propane/
LP is now complete.
Refer to Lighting Instructions on page 19.