19
139234_Rev_A 9.17 .10
Flame Picture / Air Shutter
Adjustment
THIS APPLIANCE IS SHIPPED FROM THE FACTORY
EQUIPPED FOR USE WITH NATURAL GAS. IF
CONVERTING TO PROPANE, IT WILL BE NECESSARY TO
ADJUST THE AIR SHUTTER ON THE BURNER TUBE TO
ACHIEVE THE PROPER GAS TO AIR MIX. SEE FIG. 16.
WARNING:
AIR SHUTTER ADJUSTMENTS SHOULD ONLY BE PER-
FORMED BY A QUALIFIED PROFESSIONAL SERVICE
TECHNICIAN.
The air shutter adjustment can also help achieve
the desired flame appearance. Generally, flame appear-
ance is a matter of preference, however most people
enjoy a warm, yellowish flame.
Closing the Air Shutter
- Insufficient combustion air
will result in very long yellow flames that can promote
soot. Sooting produces black deposits on the logs, on
the inside walls of the appliance, and potentially on the
exterior termination cap.
Sooting is caused by incomplete combustion in the
flames and lack of combustion air entering the air shut-
ter opening.
Opening the air shutter
- will generate a flame
that is blue and transparent, or an “anemic” flame. This
flame is generally more efficient, but not very attractive.
We recommend the following settings for the
Scan 45i gas insert:
Propane: 3/16” open
Natural Gas: 1/16” open
Run the insert for a minimum of 15 to 20 minutes for
an accurate representation of the flame appearance.
This should be done before and between any air
shutter adjustments.
To adjust the air shutter:
1. Loosen the air shutter stem wing nut located under
the firebox. See fig. 20.
2. Sliding the stem to the right opens the shutter and
increases air/fuel ratio. Sliding it to the left restricts
air flow and decreases the air/fuel ratio.
3. Allow insert to burn 30 minutes on the HIGH setting,
observing the flame continuously. Make further
adjustments in 1/8’inch increments and let the flame
settle-in before making subsequent adjustments.
4. If the flame appears weak, slow, or sooty, repeat the
process described above until the flame is as desired.
OPEN
CLOSE
Figure 20. Air Shutter location.
Figure 21. Proper flame picture - Glass Embers.
Figure 22. Proper flame picture - Tumbled Stones.
