Adjustment; Pilot Burner Adjustment; Venturi Adjustment - Napoleon BHD4N Instructions D'installation Et D'opération

9.0 ADJUSTMENT

9.1

PILOT BURNER ADJUSTMENT

Adjust the pilot screw to provide properly sized fl ame. Turn in a
clockwise direction to reduce the gas fl ow.
Check Pressure Readings:
Inlet pressure can be checked by turning screw (A) counter-
clockwise 2 or 3 turns and then placing pressure gauge tubing
over the test point. Gauge should read as described on the chart
below. Check that main burner is operating on "HI".
Outlet pressure can be checked the same as above using screw
(B). Gauge should read as described on the chart below. Check
that main burner is operating on "HI".
AFTER TAKING PRESSURE READINGS, BE SURE TO TURN
SCREWS CLOCKWISE FIRMLY TO RESEAL. DO NOT OVER
TORQUE.
Leak test with a soap and water solution.
Prior to pilot adjustment, ensure that the pilot assembly has not
been painted. If overspray or painting of the pilot assembly has
occurred remove the paint from the pilot assembly, or replace.
Fine emery cloth or sandpaper can be used to remove the paint
from the pilot hood, electrode and fl ame sensor.
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!
VENTURI ADJUSTMENT
CHART
FUEL
NG 1/16" (1.6mm)
LP 5/16" (8mm)
Natural Gas
Pressure
(inches)
7"
Inlet
(MIN. 4.5")
3.5"
Outlet
BHD4
A
3/8" - 1/2"
(9.5mm - 12.7mm)
ELECTRODE
UPPER 3/8" (9.5mm) TO 1/2"
(12.7mm) OF FLAME SENSOR
Natural Gas Propane
(millibars) (inches)
17.4mb
13"
(MIN. 11.2mb)
(MIN. 11")
8.7mb 10"
VENTURI
BURNER
ORIFICE
B
PILOT SCREW
FLAME SENSOR
PILOT
BURNER
FLAME MUST ENVELOP
Propane
(millibars)
32.4mb
(MIN. 27.4mb)
24.9mb
39.7A
AIR
SHUTTER
OPENING
49.1
W415-1285 / 04.14.14
47
EN