Monessen Hearth Direct Vent Gas Insert IDV490NVC - Manual (Page 30)

30 57D0016
AIR SHUTTER ADJUSTMENT (NATURAL GAS ONLY)
ADJUSTING THE AIR SHUTTER
The venturi of the burner is equipped with an air shutter. The opening of the venturi has been set at 1 /
4
" for Natural Gas and
fully open for Propane installation at sea level. The burner on Natural Gas Models may be adjusted for high altitude as fol-
lows:
• To increase air mixture, open the shutter more. This will reduce soot formation. See Figure 38.
• To decrease air mixture, close the shutter. Flames will be more yellow. See Figure 39.
Figure 39 - Pull Adjustment Lip Down to Close Air Shutter
Figure 38 - Push Adjustment Lip Up to Open Air Shutter
Air Shutter
Air Shutter