HVAC drain pump

serving as the primary defense against heat exchanger failure and overheating

By allowing the ECO switch to break the thermocouple signal during over-temperature conditions

and seals is often more cost-effective than a full valve swap-out

Lennox 78L19 Expansion Valve Refrigerant HVAC drain pumpProper refrigerant metering is the backbone of any reliable HVACR system, and the Lennox 78L19 Expansion Valve is a critical component for maintaining precise superheat. Designed for high performance residential and light commercial equipment, this Thermostatic Expansion Valve (TXV) is chemically compatible with both R 410A and R 22 systems. The 78L19, which is identical to 78L1901, features a durable brass body with threaded connections, making it a