41
W415-0769 / A / 12.10.10
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.
39.2
A
B
PILOT
BURNER
THERMOCOUPLE
THERMOPILE
10.0 ADJUSTMENTS
FLUE COLLAR
RESTRICTOR PLATE
TOP OF FIREBOX
Vertical terminations may display a very active
fl
ame. If this
appearance is not desirable, the vent exit must be restricted
using restrictor plate W500-0205. This reduces the velocity
of the exhaust gases, slowing down the
fl
ame pattern and
creating a more traditional appearance.
The plate has a series of holes to allow for adjustment.
Remove the two screws on either side of the exhaust col-
lar inside the
fi
rebox. Install the plate in the desired set of
holes, then replace the screws.
It is recommended to secure in the third set of holes which
causes the greatest amount of restriction for vent lengths
between 15 and 30 feet.
10.1 RESTRICTING VERTICAL VENTS
10.2 PILOT BURNER ADJUSTMENT
