12
NOTE: Before proceeding, all “light-off” permissive conditions must be satisfied.
6.
Initiate a start command to the SureFire™ igniter while observing the fuel pressure.
7.
The SureFire™ igniter ignites within 10 seconds from the time the fuel valve opens. The base of
the flame should be blue and may change to a bright yellow as the flame travels into the furnace.
8.
If the SureFire™ igniter fails to ignite, or the flame pattern is not as described in step 6, refer to
the Troubleshooting section
.
9.
Initiate a shutdown command to the SureFire™ igniter.
10.
Repeat the start and shutdown procedures of steps 6 and 8 above to demonstrate repeatability.
Once the SureFire™ igniter has been commissioned and adjustments have been optimized, the
igniter provides trouble-free operation as long as normal maintenance procedures are practiced, as
outlined in the Maintenance section.
OPERATION
The SureFire™ igniter is ready for normal operation after the installation and commissioning proce-
dures have been completed.
To place the SureFire™ igniter into service from a cold state, proceed as follows:
1.
Prepare the boiler for light-off by satisfying all light-off permissives.
2.
Start the cooling/combustion air fan(s) or open air path from other source. These fans must
remain in service while the boiler is in operation, unless alternate means of cooling the igniter
tip is provided.
3.
Prepare the igniter gas supply and header system to allow pressure to the individual igniter block
valves.
4.
Set the igniter fuel regulator to the specified pressure.
5.
Initiate an igniter start. The following sequence of events occurs as the SureFire™ igniter goes
into service.
— The HEI is energized and starts to spark.
— The gas double block valve opens and the vent valve closes admitting fuel to the igniter.
— Ignition occurs within approximately 5 seconds of the fuel admission.
— The flame detector detects flame 8 to 10 seconds from the start of the start signal initiation, if
applicable.
— The HEI is de-energized and stops sparking.
If an igniter flame is not detected within 10 seconds, the igniter block valves are closed, the igniter
trip is initiated, and the HEI is de-energized.
On a manually controlled igniter system, the time limits discussed previously in step 5 still apply.
However, the operator must initiate shutdown of the fuel flow to the igniter, if an igniter flame is not
detected within approximately 10 seconds.
To place SureFire™ igniters in service on an operating boiler, follow preceding steps 3 through 5.
To remove SureFire™ igniter from service, either manually or automatically, follow these steps:
1.
Initiate an igniter STOP command. The following sequence of events occurs:
— The gas block valves close, and the vent valve opens.
— The HEI power unit is deenergized (if energized).
— The SureFire™ igniter extinguishes and is ready for the next operating cycle.
2.
Close the igniter main gas trip valve, if the igniters will not be needed for an extended period of
time.
Summary of Contents for SureFire 20
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