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activating only when frost buildup is detected via the included coil temperature sensors
fully open
OEM Precision: Guaranteed fit for specific Aaon equipment
this spark ignition control maintains system efficiency across popular models like the 58GS and 394GAZ series
OEM Compatibility: Exact drop-in replacement for Goodman and Amana air handlers and furnaces
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