Flame Safeguard Upgrades: When to Replace an Older Burner Control
The flame safeguard is the control that runs a burner's safety sequence. It confirms conditions are safe before starting, runs the prepurge, lights the pilot or main flame, proves the flame with a scanner or flame rod, and closes the fuel valves if the flame is lost.
Signs it's time to look at an upgrade
Replacement parts or modules are hard to find or no longer made.
Lockouts that clear on reset and come back, with no clear cause.
No fault history or diagnostics, so every trip has to be traced by hand.
Plans to add something the old control can't support, such as valve proving, linkageless fuel-air control, or a connection to a building automation system.
What an upgrade involves
Most upgrades replace the control and its flame detector and keep the burner, fuel train and blower in service. The work usually runs in this order:
Match the new control and flame detector to the burner type and fuel.
Rewire the safety circuit, limits and interlocks to the new control.
Set purge and ignition timing for the burner.
Test each safety shutdown, including flame failure and each limit.
Set up combustion across the firing range with a calibrated analyzer and record the readings.
The new control should be listed for the application, and the work should meet the codes and inspector requirements that apply where the boiler is installed.
Burners from manufacturers that no longer exist are common candidates. The burner itself can often stay in service with a current control, as with Gordon-Piatt burners. For a bigger change, replacing mechanical linkage with a linkageless system, see our burner management system comparison.
We troubleshoot, replace and set up flame safeguards and burner controls, and every job ends with a written report. Request service or email service@combustionspecialists.com.
