United Electric J21K-232 Pressure Switch 318172-701 As a veteran-grade HVAC compressor

As a veteran-grade HVAC compressor oil filter

This genuine OEM Trane replacement part serves as the primary processing hub

Reliable Switching: Heavy-duty relays and solid-state components handle the inrush current of condenser and evaporator fans

Where should the 8 inch probe be positioned

What is the power requirement for the solenoid coil

United Electric J21K-232 Pressure Switch 318172-701 As a veteran-grade HVAC compressorThe United Electric J21K 232 Pressure Switch is an industrial grade differential pressure switch engineered for precise monitoring in HVAC filtration, pumping systems, and compressor protection. Built with dual phosphor bronze bellows, this unit maintains superior setpoint repeatability of 1% by sensing the delta between high and low pressure ports via opposing sensors. This mechanical balance ensures a rapid snap action response, making it highly