18
W415-0318 / 03.05.09
7.2 PILOT BURNER ADJUSTMENT
Remove the pilot screw cap. Adjust the pilot screw to
provide properly sized fl ame. Turn in a clockwise
direction to reduce the gas fl ow. Replace the pilot
screw cap.
7.3 VENTURI
ADJUSTMENT
P
ILOT
AIR SHUTTER OPENING
ORIFICE
VENTURI BURNER
FLAME MUST
ENVELOPE
UPPER 3/8" TO 1/2" OF
THERMOCOUPLE &
THERMOPILE
PILOT
BURNER
THERMOCOUPLE
THERMOPILE
Air shutter adjustment must
only be done by a quali
fi
ed gas
installer!
3"/ 3" LINER SYSTEM
FRONT REAR
NG
1/16"
3/16"
LP
3/16"
7/16"
AIR SHUTTER SETTING
2"/ 3" LINER SYSTEM
FRONT REAR
NG
1/8"
1/4"
LP
1/4"
5/8"
AIR SHUTTER SETTING
This unit is approved for use with a 2" liner for air intake and a 3" liner for exhaust. For best performance, how-
ever, it is recommended to use two 3" liners.
Air shutter settings will differ depending on the liner system used. Use the charts below to determine the cor-
rect air shutter setting:
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.
FIGURE 7.2a
FIGURE 7.2b
FIGURE 7.3
PILOT ON/OFF
KNOB
PILOT SCREW
