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BBG-9
For Gas Pilot Ignition:
c. Ensure that the pilot automatic safety solenoid valves and the pilot manual gas valve are
closed.
d. Energize the igniter transformer.
e. Open the pilot gas automatic safety shutoff solenoid valves and the pilot manual gas
valve.
f. Once the pilot flame has been established (confirm using flame supervision), de-
energize the ignition transformer.
g. Open (energize) the main automatic gas or oil safety shutoff valves.
h. Once flame has been established, the pilot gas automatic safety shutoff valves may
close. Leave the manual pilot air valve in position.
i. Proceed to ignite all burners (if applicable) per the above procedure.
For Air-Cooled Direct Spark Ignition:
c. Energize the ignition transformer.
d. Open (energize) the main automatic gas safety shutoff valves.
e. Once flame has been established de-energize the ignition transformer.
f. Proceed to ignite all burners (if applicable) per the above procedure.
6. When all burners are ignited, increase the combustion air to the high fire position (refer to
appropriate capacity sheet for burner air flow at high fire conditions).
7. When high fire combustion air is set, adjust the gas control valve (limiting gas valve or
automatic butterfly valve) to achieve the desired gas flow at high fire (refer to appropriate
capacity sheet for burner gas flow at high fire conditions).
8. Verify air/fuel ratio using orifice meters in the air and gas lines. Static air pressure at the
burner air inlet can be related to air flows if an air orifice meter is not available. Static gas
pressure is very low and should not be used to extrapolate flows.
9. Drive the burner to the low fire position and verify that the settings are consistent. Repeat
steps 6 through 9 as necessary until high and low fire settings remain constant.
10. Lock all control motor linkage or direct-couplings in place and return all control system
functions to normal, if changed during initial adjustments.
11. To shut down the burner system:
a. Return the burner(s) to the low fire position.
b. Close all fuel shutoff valves.
c. Allow the furnace to cool to 300°F (150°C) or less before shutting off the combustion air
blower.
H. OPERATION
Once properly installed, ignited and fired, the burner is ready for operation. The operation of the
burner will depend on the specific items in the combustion control system and the application of
the burners. Refer to the instruction sheet that accompanies each item. The burner should
always be ignited under low fire conditions. When the burner is firing, the spark igniter or gas
pilot should be shut off. If the burner ignition tile is exposed to excessive moisture or extended
periods of dampness,
at least 30 minutes of low fire drying at 100% excess air is required
before beginning normal operation. Failure to do so will cause any moisture present to
expand rapidly, causing damage to the refractory.
I. MAINTENANCE
CAUTION
Be sure burner internals have cooled sufficiently before attempting to disassemble
any components. Use care when separating gasket surfaces to avoid damage to the
gaskets. All maintenance work should be accomplished by trained and experienced
personnel only.