Osburn SATURNA Installation And Operating Instructions Manual page 26

Natural gas & propane direct vent gas fireplace insert
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3.3.7.3 Primary air adjustment
Too little aeration may result in black carbon forming and dropping into the firebox.
For most installations use air adjustment according to table 1. However in a very few instances
performance may be improved by sliding the adjustment lever (see figure below).
To gain access to the air shutter lever open the decorative front doors, the lever passes through the
control panel cover. Pushing the lever to the rear increases aeration which will cause the flames to
appear more transparent and blue making the ceramic logs glow more. Sliding the lever to the front
decreases aeration and will cause the flames to appear more yellow or orange making the ceramic
logs glow less. Evaluate the aeration only after the unit has warmed up approximately 45 minutes.
Figure 21
26

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