for solar heating systems
255 - 256 series

Function
The circulation unit is used on the primary circuit of solar heating systems to control the temperature in the hot water storage.
The pump inside the unit is activated by the signal from the differential temperature regulator. In addition, this unit contains the functional and safety devices for optimum circuit control.
The unit components enable:

• Medium circulation with specific pump
• Safety against pressure increase
• Accurate flow rate control
• Filling / draining the circuit
• Measuring the flow and return temperature
• Separating the air contained in the circuit
• Shutting off the circuits and non return
• Thermal insulation