Honeywell L4029E1219 – Limit Control Factory Set 165F
L4029E Reset Limit Control opens a line or low voltage circuit if the air temperature reaches a critical level. L4029E acts as a fire thermostat in the ducts of AC & ventilating systems. If the air temperature indicates a fire, the fan is shut down. Shuts off the fan when air temperature is indicative of fire. Internal snap-acting switch actuated by a bimetal strip inserted directly into the air stream responds rapidly to temperature changes. Requires manual reset.