and D249500S

the Y65A13-0 is designed for continuous operation in environmental control systems

it accommodates hardwired or battery power options

Technicians should verify fitting sizes and mounting footprints

Lennox 78H11 Thermostat 321702-401 and D249500SAs a seasoned technician, you know that a frozen outdoor coil is a quick way to kill system efficiency and stress the compressor. The Lennox 78H11 is a critical heat pump defrost thermostat (L70 35F) designed specifically to regulate the defrost cycle in Lennox heat pump applications. This OEM Lennox replacement part features a fixed temperature range, initiating the defrost sequence when the liquid line or coil temperature drops to 35F and