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MDVFST DIRECT-VENT GAS FIREPLACE

INSTALLATION INSTRUCTIONS

SIT Nova Millivolt Valve

Air Shutter

Orifice

Burner

 

 

 

FOR CONVERSION NATURAL TO PROPANE/LP

Continued

Conversion Screw

ON

T

O

L

I

P

Firebox Bottom

Venturi

Tube

Burner Gas Line

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.

OFF

Stem

Top

Figure 58 - Valve

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 59 - Connecting Venturi and Orifice

CORRECT

 

 

Long, Blue Flame

INCORRECT

with Yellow Tips

 

CLOSE

 

SHUTTER

Short, Sharp,

 

Blowing Flame

INCORRECT

 

OPEN

Long, Uneven,

SHUTTER

 

Yellow Flame

Figure 60 - Burner Flame Patterns

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Desa MDVFST installation manual Installation Instructions, For Conversion Natural to PROPANE/LP, Adjusting AIR Shutter

MDVFST specifications

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