Cleaver-Brooks Packaged Boiler FLX-500

Leave the gas pilot shutoff cock open

Did the pilot light upon completion of the pre-purge period?

Are the main fuel valves energized without main flame?

Did the fuel valves de-energize within four seconds after the main burner ignition trial ends?

Inspect the nozzle for any visible damage or clogging.

Unscrew the tip from the nozzle body.

Clean the screen, swirler, and tip in solvent.

Ensure no wire or sharp metal tools are used for cleaning the nozzle orifice.

Reassemble the nozzle ensuring the swirler is seated tight against the tip.

Reassemble the nozzle into the nozzle body.

If replaced, confirm the nozzle is identical in make, size, and spray angle.

Ensure the pilot gas regulator is accessible

Verify that the flame safeguard system information is available

Measure the flame signal using a microamp or voltage reading

Is the flame size sufficient to ignite the main flame and visible to the flame detector?

Is the flame size too large, causing sooting or carbon buildup?

Adjust the gas flow through the pilot gas regulator as necessary

Refer to the controls documentation for parallel positioning systems

Consult the accompanying wiring diagram for system adjustment information

Manual Reference for C-B Hawk Systems

Refer to the appropriate manual for C-B Hawk systems

Verify that the independent actuators for fuel, air, and FGR are coordinated

Is the combustion optimized throughout the firing range?

Preparation for Diffuser Removal

Mark the diffuser's relative position to the blast tube

Remove the screws holding the diffuser to the blast tube

Slowly pull the diffuser along the blast tube towards the firing head

Diffuser Cleaning and Reinstallation