stop r frost protection valve with outdoor air sensor series 108 Connection size:1 1/4" - 70 kV This makes it an ideal

This makes it an ideal solution for applications in industrial and residential settings

sootfire resistant

Emergency operation with logs is possible according to the manual

secondary and tertiary air ducts available

The same applies here

stop r frost protection valve with outdoor air sensor series 108 Connection size:1 1/4" - 70 kV This makes it an idealCaleffi frost protection valve for heat pumps 1" and 1 1 4'' with outside air duct The frost protection valve prevents the medium in the system circuit from freezing and thus prevents damage to the heat pump and pipes. The valve is a mechanically operating protective system. The version with an outdoor air sensor allows the system to operate in cooling mode even when the water temperature approaches 3C. TECHNICAL DATA Frost protection valve Caleffi