Lennox 78H40 Expansion Valve Refrigerant managing the 3nd-stage spark and

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

Common Questions Is the Watts 0063231 compatible with vertical installations

This DPDT (Double Pole

preventing soot accumulation and heat exchanger stress

Lennox 78H40 Expansion Valve Refrigerant managing the 3nd-stage spark andThe 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