Initial Firing; Altitude Adjustment; Figure 3.13 Flame Adjustment - Osburn Designer DV36 Installation And Operation Instructions Manual

3.10.3 Initial Firing

occasionally , after a cold start, vapour may condense and fog the glass, and the flames may be partially blue.
After a few minutes the moisture will disappear and the flames will become yellow. Visually check the
maximum flame height after the unit has warmed up (15 to 20 minutes). The tips of the flame (Figure 3.13)
should be no closer than 1 to 2 inches below the top of the firebox chamber.
Figure 3.13 Flame Height

3.10.4 Altitude Adjustment

All valves have been pre-set and certified for installation at elevations from 0 - 4500 feet (0-1370 m) above sea
level.
When installing this fireplace at higher elevations, it is necessary to decrease the input rating, by changing the
existing burner orifice to a smaller size. Input should be reduced 4% for each additional 1000 feet above sea
level.
Use Tables 3.3 and 3.4 or check with the local gas authorities for proper orifice size identification. In the
USA, de-rate the heater from sea level according to the gas installation code.
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