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4) Combustion Air Damper
To produce the required combustion airflow, this damper can be adjusted. Remove the screen to get
access to the damper. Moving the damper closer to the blower inlet opening will reduce the combustion
airflow, and moving it away from the blower inlet opening will increase the airflow. To measure the
combustion airflow, attached a manometer to the air pressure tap on the burner box. The air pressure
should measure 1.25- inches (31.75 mm) to 1.5-inches (38.1 mm) water column (W.C.).
e. Pilot Gas Supply Line
1) The pilot gas supply line consists of a manual shut-off valve, pressure regulator, electric solenoid valve,
back-loaded pressure regulator, and an adjustable gas cock.
2) The gas pressure in this line should be approximately 3.5-inches (88.9 mm) water column (W.C.) for
natural gas and 1.5-inches (38.1 mm) water column for L.P. (liquid propane) gas. This will provide
a bushy pilot flame, which produces a signal through the flame rod that is converted to 3 to 11 volts DC
in the burner controller module (BMC).
a) This flame can be adjusted in two (2) ways.
(1) Pilot Inlet Pressure Regulator
Remove the cap and turn the slotted adjustment screw clockwise (CW) for more gas and
counterclockwise (CCW) for less gas.
(2) Adjustable Pilot Gas Cock
Remove the cap and turn the slotted adjustment screw clockwise (WC) for less gas and
counterclockwise (CCW) for more gas.
b) The pilot line contains a back-loaded pressure regulator with an impulse line connected to the gas
burner inlet. The regulator will maintain a constant pilot supply pressure in the burner due to an
increase in temperature.
DO NOT adjust this regulator.
f. Main Gas Supply Line
The main gas supply line consists of a pressure regulator, two (2) motorized shut-off valves, HI/LO gas
pressure switch, manual shut-off valve.
The gas pressure at the burner should be 2.5-inches (63.5 mm) water column (W.C.) for natural gas and
1.25-inches (31.8 mm) water column for L.P. (liquid propane) gas. This pressure is measured by a
manometer at the manual shut-off valve just top motorized valve.
1) Motorized Gas Valve
The two (2) 2-inch F.P.T. motorized valve are “ON/OFF” gas flow control valves. The valves motors
operate on 120 VAC and are electrically “cascaded” so that upper valve will not open until lower valve
has fully opened. A limit switch inside the lower motorized valve provides the signal that the valve is
fully opened. These valves will open only when the burner controller module (BCM) is receiving a
signal from the flame rod proving that the pilot flame is established.
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