RVL1s SIGMAGYR weather-dependent flow temperature controller (AC 220 V). Direct replacement by RVL480 however it is recommended that the 
Key data to replacement product: unit is completely rewired with 
Key data to replacement product: field devices to suit the application (see Data Sheet). RVL480 has many 
Key data to replacement product: features, including optimization, holiday programs, digital display and auxiliary functions. 
Info: Do not use the existing base as terminals are different - the 
Key data to replacement product: unit must be rewired.