The Emerson Alco 027511 Lens Assembly (Model X12978-1) is a critical service component designed for the upkeep and repair of moisture liquid indicators within commercial refrigeration and HVAC systems

This OEM replacement is commonly used in select Rheem and Ruud residential and light commercial condensing units where the original fan blade specifications match exactly

This specific model supports 2 stages of heat (typically compressor plus auxiliary heat) but only 1 stage of cooling

When performing routine maintenance or replacing a hot surface igniter

the sensor should be mounted vertically as indicated by the arrows on the enclosure

Heil Quaker ICP 1171805 Pressure Switch 326010-701 The Emerson Alco 027511 LensThe Heil Quaker ICP 1171805 Pressure Switch is an essential OEM safety component designed for high pressure monitoring in residential and commercial HVAC systems. Engineered to protect the compressor and sealed system integrity, this high pressure switch features a precise Cut Out (C O) at 426 PSI and a Cut In (C I) at 320 PSI. As a genuine ICP replacement part, it ensures seamless compatibility with Heil, Tempstar, Comfortmaker, and KeepRite