Lennox 78H40 Expansion Valve Refrigerant the STT17A-610R ensures reliable head

the STT17A-610R ensures reliable head pressure control and prevents the waste of cooling water during compressor standby

managing the 3nd-stage spark and flame sensing for reliable start-ups

Can this handle chilled water applications

If you're seeing oil seepage on the shaft or getting a "limit trip" due to low airflow

Lennox 78H40 Expansion Valve Refrigerant the STT17A-610R ensures reliable headThe Lennox 78H40 Expansion Valve is a critical 6 ton thermostatic expansion valve (TXV) engineered for precise refrigerant metering in high capacity light commercial and residential cooling systems. As a veteran grade HVAC replacement part, the 78H40 (identical to Lennox 78H4001) regulates refrigerant flow into the evaporator coil by sensing heat load changes, preventing liquid slugging and ensuring the compressor receives superheated vapor. This TXV