it manages the synchronized operation of the 120V fan motor and the water solenoid valve

Precise Modulation: Modified linear flow profile prevents hunting and stabilizes temperature control

this combination control integrates a manual gas cock

Industrial Build Quality: High-tolerance construction minimizes mechanical play in the linkage

Carrier HH680502 Limit Switch 340155-7024 it manages the synchronized operationThe Carrier HH680502 Limit Switch is a critical safety component designed for precise thermal monitoring in residential and commercial furnaces. This 90 120F auto reset limit switch functions as a primary high limit control, specifically engineered to open the electrical circuit if internal plenum temperatures exceed the 120F threshold. Once the heat exchanger cools to the 90F reset point, the switch automatically closes, restoring system operation.