Lennox 21N39 Scale Insert 319852-301 Designed as a direct replacement

Designed as a direct replacement for various Trane and American Standard heat pump controls

ensuring precise control over startup and shutdown sequences to prevent short-cycling

This product may contain chemicals known to the State of California to cause cancer or reproductive harm

Enables precise adjustment of the operating span and starting point when used with D-9502 positioners

providing flexibility during system maintenance or field testing

Lennox 21N39 Scale Insert 319852-301 Designed as a direct replacementMaintain peak performance in humidification systems with the Lennox 21N39, a precision engineered scale control insert designed to manage mineral accumulation and ensure consistent evaporation rates. This OEM humidifier replacement part acts as the structural frame and pad holder for high capacity systems, effectively channeling water across the media while trapping scale before it can compromise internal components. Measuring 14 3 8" by 10", this