Markel 57640003 Limit 320074-702 activating only when frost buildup

activating only when frost buildup is detected via the included coil temperature sensors

ensuring a precise fit in Trane and American Standard air handlers or furnace units that require a secondary or primary safety circuit feedback

the 903033P is a non-adjustable

OEM Precision: Guaranteed fit for specific Aaon equipment

this industrial temperature controller allows for precise set-point management without sacrificing durability

Markel 57640003 Limit 320074-702 activating only when frost buildupThe Markel 57640003 Limit Control is a critical safety component engineered for high performance thermal regulation in industrial and commercial heating systems. This L300F auto reset limit switch is specifically designed for 5100 series unit heaters ranging from 7kW to 10kW. Utilizing a sensitive capillary tube and bimetal disc, the 57640003 monitors temperatures near the heat exchanger and provides a reliable break in the electrical circuit when