Lennox 26H78 Rollout Switch Rugged Construction: Features high-quality thermosetting

Rugged Construction: Features high-quality thermosetting resin contact blocks and a Class B coil insulation rating (130°C)

Once the water cools

OEM Thermal Calibration: Factory-set 140°F trip point provides accurate over-temperature protection matched to specific York heat exchanger tolerances

it monitors the heat exchanger for overheating symptoms and will automatically open the circuit to de-energize the gas valve if temperatures exceed the 140°F threshold

Contractors can utilize this SPST limit control to reduce inventory

Lennox 26H78 Rollout Switch Rugged Construction: Features high-quality thermosettingThe Lennox 26H78 Rollout Switch (catalog number 26H7801) is a critical safety component designed for furnace flame rollout protection. This OEM Lennox part is a manual reset, SPST (Single Pole Single Throw) configuration that actuates at a fixed temperature of 260 degrees F. When the switch senses excessive heat near the burner boxtypically caused by a cracked heat exchanger, blocked flue, or insufficient combustion airit breaks the 24V circuit to the