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this switch is a standard safety control for many Trane circuits
What causes a K90-67 overload to trip repeatedly
effectively preventing vacuum conditions
including 51-21854-01 and 51-21854-02
ensuring precise refrigerant flow control and preventing liquid slugging in the compressor
Siemens Building Technology QFA3230.FWSN Sensor L99H008 this switch is a standardThe Siemens QFA3230. FWSN is a high precision room relative humidity sensor engineered for demanding building automation environments. Designed to interface seamlessly with controllers via 0 10Vdc or 4 20mA selectable outputs, this unit provides critical environmental data for variable air volume (VAV) systems and air handling units (AHUs). It offers a full 0 100% RH measurement range paired with a 10k? Type II thermistor for integrated temperature
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