Adjustments; Gas Pressure Adjustment; Venturi Adjustment; Flame Characteristics - Napoleon GT8N Installation And Operating Instructions Manual

9.0 ADJUSTMENTS

9.1

GAS PRESSURE ADJUSTMENT

Outlet pressure can be adjusted if not
measuring 3.5" W.C. (NG) or 10.0" W.C. (LP).
Pressure can be checked by
A.
removing cap (A) using a 3/16 Allen
key and replacing it with a 1/8 NPT
barb fi tting.
Place pressure gauge tube over the
B.
fi tting.
Pressure can be adjusted by
C.
removing cap (B) using a fl at
screwdriver, and adjusting the nylon
plug with the same screw driver.
Turning the plug in (clockwise) will
increase the pressure.
9.2

VENTURI ADJUSTMENT

This model has an air shutter that has been factory set open according to the chart below:
Closing the air shutter will cause a more yellow fl ame, but can lead to carboning.
Opening the air shutter will cause a more blue fl ame, but can cause fl ame lifting
from the burner ports. The fl ame may not appear yellow immediately; allow 15
to 30 minutes for the fi nal fl ame color to be established.
AIR SHUTTER ADJUSTMENT MUST ONLY BE DONE BY A QUALIFIED
INSTALLER!
NOTE: It is important that the venturi sits down tight on the orifi ce.
AIR SHUTTER OPENINGS
LP 5/16" DIA (x2)
NG 3/16" DIA (x1)
9.3

FLAME CHARACTERISTICS

It is important to periodically perform a visual check of the burner fl ame. Compare
them to the illustration provided.
VENTURI
BURNER
AIR
SHUTTER
OPENING
49.3
W415-0794 / D / 05.30.11
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