Staged Element Control: Prevents massive inrush current by sequencing the activation and deactivation of heating banks

If you are switching the relay using a standard 24V thermostat signal

Professionals frequently utilize this 23

which leads to excessive internal temperatures that exceed the thermal fuse rating

Installing a new OEM flame rod is the standard procedure for resolving intermittent flame signal loss

Trane THT0811 Limit Switch Staged Element Control: Prevents massiveThe Trane THT0811 is a critical automatic reset limit switch engineered for precise thermal regulation and safety interlocking in Trane and American Standard HVAC systems. Designed with an operational range of 73F to 105F, this high limit temperature switch monitors plenum temperatures and provides a fail safe against overheating. As a genuine OEM replacement part, it ensures the timing for blower fan cycles is maintained according to factory