The Raftec R521WL switch is used to transmit discrete signals (on/off) from room thermostats to thermostatic valve actuators that control the flow of coolant through the circuits of the water heating system (including built-in heating systems). The switch allows combining servo drives and is designed for 8 heating zones (rooms) controlled from one thermostat. The switch has a relay output to control the heating system circulation pump and boiler. In the absence of a heating request (all thermostatic valves are closed), the pump automatically turns off, thereby saving electricity and extending the pump's service life. The LED located opposite the corresponding contacts of the communicator signals the supply of a control signal to any actuator. The switch can control normally closed servo drives.
