Adjustments; Pilot Burner Adjustment; Venturi Adjustment - Napoleon BGD90NT Operating Instructions Manual

11.0

ADJUSTMENTS

11.1 PILOT BURNER ADJUSTMENT

Adjust the pilot screw to provide properly sized fl ame. Turn in a clockwise
direction to reduce the gas fl ow.
Inlet pressure can be checked by turning screw (A) counter-
clockwise until loosened and then placing pressure gauge
tubing over the test point. Gauge should read 7" (minimum 4.5")
water column for natural gas or 13" (11" minimum) water column for
propane. Check that main burner is operating on "HI".
Outlet pressure can be checked the same as above using screw (B).
Gauge should read 3.5" water column for natural gas or 10" water column
for propane. Check that main burner is operating on "HI".
AFTER TAKING PRESSURE READINGS, TIGHTEN SCREWS FIRMLY TO
SEAL. DO NOT OVER TORQUE. LEAK TEST.

11.2 VENTURI ADJUSTMENT

This appliance has an air shutter that has been factory set open according
to the chart below:
Regardless of venturi orientation, closing the air shutter will cause a more
yellow flame, but can lead to carboning. Opening the air shutter will cause a
more blue flame, but can cause flame lifting from the burner ports. The
flame may not appear yellow immediately; allow 15 to 30 minutes for the
final flame colour to be established.
AIR SHUTTER ADJUSTMENT MUST ONLY BE DONE BY A QUALIFIED
INSTALLER!
PILOT
BURNER
THERMOCOUPLE
39.2
VENTURI
BURNER
ORIFICE
49.1
Air Shutter Openings
Front
LP 3/8"
NG 5/32"
43
THERMOPILE
A
B
AIR
SHUTTER
OPENING
Rear
7/16"
3/16"
W415-0826 / C / 07.11.11