25
3.3.8.3Primary Air Adjustment
Figure 21
For most installations no primary air adjustment will be needed, however in a very few instances
performance may be improved by sliding the adjustment lever (see above figure). To gain access to
the primary air adjustment lever, open front pedestal door and remove the control panel cover.
Sliding the lever to the right increases aeration which will cause the flame to appear more transparent
and blue making the ceramic fuel effects glow more. Sliding the lever to the left decreases aeration
and will cause the flames to appear more yellow or orange, making the fuel effects glow less.
Evaluate the aeration only after the unit has warmed up approximately 15 minutes.
Too little aeration may result in black carbon forming and dropping into the firebox.
3.3.8.4Altitude Adjustment
All valves have been pre-set and certified for installation at elevations from 0 – 4500 feet (1 – 1372m)
above sea level.
When installing this heater at higher elevations, it is necessary to decrease the input rating by
replacing the existing burner orifice with a smaller size for installations over 4500 feet (1372m). The
appliances input should be reduced 4% for each additional 1000 feet (305m) above sea level. For
the USA, de-rate the heater from sea level according to the gas installation code.
