Its compatibility with legacy systems makes it a go-to replacement HVAC part for contractors managing high-efficiency hydronic systems

This part is specifically calibrated for natural gas (NG) configurations and must be matched to the unit's serial number to ensure correct orifice and pilot alignment

For technicians troubleshooting intermittent system lockouts or failed inducer motor engagement

In the Maxitrol system

they are functionally identical

Bard HVAC 5651-077 TXV 322055-301 Its compatibility with legacy systemsThe Bard HVAC 5651 077 Thermostatic Expansion Valve (TXV) is a critical metering device engineered for precise refrigerant flow control in 2. 5 ton air conditioning and heat pump systems. Designed with 3 8" x 3 8" ODF solder connections, this valve ensures a leak free integration into the liquid line. It functions by monitoring evaporator superheat, adjusting the orifice to match the cooling load, which prevents liquid slugging and protects the