As an essential HVAC motor starter

or visible carbon scorching on the relay terminals

allowing the integration of current-loop controllers with voltage-driven modulating damper actuators

the 13H28 is the direct replacement for 51M4401 and maintains the same footprint and electrical specifications for a seamless swap

Danfoss 068U1839 TXV Els PW 17895 As an essential HVAC motorThe Danfoss 068U1839 Thermostatic Expansion Valve (TXV) is a TUB series expansion valve engineered for tight superheat control in refrigeration and light commercial A C systems. This specific model features a 1 4" ODF inlet and a 3 8" ODF outlet in an angleway configuration, utilizing bi metal (stainless steel copper) connections that simplify soldering by eliminating the need for wet rag cooling during installation. Designed for R134a and R513A