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ADJUSTMENTS
VENTURI ADJUSTMENT
Air shutter adjustment must be done by a qualifi ed
installer!
All models have air shutters that have been factory set open
according to the chart below:
These setting are for (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.
BGD/BCDV36
BGD/BCDV36CF BGNV/BCNV36
NG
1
/
16
”
1
/
16
”
1
/
16
”
LP
1
/
4
”
1
/
4
”
3
/
8
”
Adjust the pilot screw to provide properly sized fl ame. Turn
in a clockwise direction to reduce 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 OVERTORQUE.
LEAK TEST
3/8” - 1/2”
FLAME MUST
ENVELOPE UPPER
3/8" TO 1/2" OF
THERMOCOUPLE &
THERMOPILE
It is important to
periodically perform
a visual check of the
pilot and burner fl ames.
Compare them to the
illustrations provided.
Maximum Input Ratings
BGD/BCDV36
BGD/
BCDV36CF
BGNV/BCNV36
NG
18,000 BTU/hr
17,000 BTU/hr
17,000 BTU/hr
LP
17,000 BTU/hr
17,000 BTU/hr
17,000 BTU/hr
To access the air shutter, remove the two screws that secure
the cover to the air housing, taking care not to damage the
gasket.
PILOT
BURNER
THERMOCOUPLE
THERMOPILE
P
I
PILOT
N
O
L
O
T
H
I
L O
F
F O
A
B
PILOT SCREW
PILOT BURNER ADJUSTMENT
VENTURI
AIR SHUTTER
OPENING
ORIFICE
