Adjustment; Restricting Vertical Vents; Venturi Adjustment; Flame Characteristics - Napoleon GDS25N Installation And Operating Instructions Manual

9.0 ADJUSTMENT

9.1

RESTRICTING VERTICAL VENTS

Vertical installations may display a very active fl ame. Loosen the two screws and slide the restrictor plate blocking
the exhaust path. This reduces the velocity of the exhaust gases, slowing down the fl ame pattern and creating a
more traditional fl ame appearance. For vertical vents greater than 15 ft (4.6m), this restrictor must be fully closed.
SHOWN IN A FULLY
9.2

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!
Remove the 2 screws securing the burner. Air shutters have been
factory set open according to the Venturi Adjustment Chart. These
settings are for (maximum) horizontal termination. Adjustment may be
required depending on fuel type, vent confi guration and altitude. After
making adjustments replace the burner ensuring that the venturi tube
fi ts over the orifi ce and replace the screws.
9.3

FLAME CHARACTERISTICS

It's important to periodically perform a visual check of the pilot and burner
fl ames. Compare them to the illustrations provided. If any fl ames appear
abnormal call a service person.
RESTRICTOR
OPEN POSITION
RESTRICTOR
SHOWN IN A FULLY
CLOSED POSITION
VENTURI
BURNER
ORIFICE
49.1
VENTURI ADJUSTMENT CHART
FUEL GDS25
NG 5/16" (7.9mm)
LP 7/16" (11.1mm)
54.3
W415-0547 / J / 07.16.13
33
EN
AIR
SHUTTER
OPENING