Description
The Lennox 17D76 Limit Control measures furnace plenum temperatures and prevents overheating conditions in forced-air heating systems requiring automatic safety shutoffs. This snap-action thermostat opens electrical circuits at preset temperature thresholds interrupting burner operation when heat exchanger surfaces exceed safe operating limits in HVAC systems. The system’s bimetallic sensing element responds to thermal changes by mechanically actuating heavy-duty contacts rated for 20-ampere loads at 250-volt service. Adjustable setpoint calibration to match specific equipment requirements while differential settings prevent rapid cycling between on and off states.
