Alternative to the setting key Art. No. 3501-02.142 for the operation of Retro S, also suitable for thermostat head B (temperature setting), return connection Regulux, connection fitting Vekolux, and radiator bleed valve.

Installation note according to § 13 NAV.

Please note that devices with a connection value of 230V are delivered with either a protective contact plug or a fixed connection (without plug) depending on the power rating. If the device has a fixed connection, a qualified technician must be commissioned for the installation. All devices with a connection value of 400V and above must be operated via a suitable high-voltage connection and may only be connected by a qualified electrician. For devices with a rated power of more than 12KW, approval from your network operator is required. Please contact the network operator or an installation company registered in the network operator's installer directory before installation. Such an installation company will assist you in obtaining the necessary approval from the respective network operator.