Trane SWT3018 Pressure Switch 318973-401 System Integration: Native RS-485 Modbus

System Integration: Native RS-485 Modbus and 4-20mA current loop compatibility for effortless pairing with 301EM controllers and BAS networks

ensure the system is thoroughly flushed before installing this MTZ replacement

High-Pressure Certification: CSA certified for use with 5 psi natural gas and 2 psi LP gas systems when paired with compatible 325 series units

Common Technician Questions How do I set the defrost frequency

Integrating this furnace limit control into your York furnace maintenance routine prevents nuisance tripping and protects the heat exchanger from thermal stress

Trane SWT3018 Pressure Switch 318973-401 System Integration: Native RS-485 ModbusFor field techs managing low pressure protection in commercial and residential systems, the Trane SWT3018 Pressure Switch (cross referenced as SWT03018) is a critical OEM safety component. This SPST normally open pressure switch is engineered to monitor system conditions and prevent compressor damage due to refrigerant loss or extreme temperature drops. It features a precise 25 PSI open setpoint and a 41 PSI close (reset) point, making it standard for