32
W415-0210 / R / 02.27.08
These settings are for rear vented (maximum) horizontal
termination. Adjustment may be required depending on fuel
type, vent confi guration and altitude.
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 colour to be established.
Air shutter adjustment must only be done by a
qualifi ed installer!
To access the air shutter, remove the two screws that secure
the cover to the air housing, taking care not to damage the
gasket.
FLAME MUST
ENVELOPE
UPPER 3/8" TO 1/2" OF
THERMOCOUPLE &
THERMOPILE
PILOT
BURNER
THERMOCOUPLE
THERMOPILE
Adjust the pilot screw to provide properly sized fl ame. Turn
in a clockwise direction to reduce the gas fl ow.
FIGURE 70
VENTURI
ORIFICE
AIR SHUTTER
OPENING
FIGURE 72
FIGURE 69
P
I
PI
PILOT SCREW
L OT
N
O
L
O
T
H I
L O
FF
O
ADJUSTMENTS
PILOT BURNER ADJUSTMENT
VENTURI
FIGURE 73
VENTURI ADJUSTMENT
GD36
BGD36
NG
1/16”
1/16”
LP
1/4”
1/4”
Both fi replace models have air shutters that have been factory
set open according to the chart below:
FLAME ADJUSTMENT
H I
LO
Turn counterclockwise
to decrease fl ame
height
Turn clockwise to
increase fl ame height
FLAME
ADJUSTMENT KNOB
FIGURE 71
FIGURE 74
FLAME CHARACTERISTICS
It is important to
periodically perform
a visual check of the
pilot and the burner
fl
ames. Compare
them to the fi gures
shown. If any fl ames
appear abnormal call
a service person.
3/8” - 1/2”
FIGURE 75
P
I
P ILOT
N
O
L
O
T
H I
L O
FF
O
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