Danfoss Icon Master Controller 24V with 15 channels. Underfloor heating control for the Danfoss Icon series with 15 outputs for thermal actuators. Up to 15 room thermostats, wireless/wired, can be registered. The Master Controller must be combined with the Danfoss Icon radio module if wireless room thermostats are to be registered. Automatic balancing, active pump relay, function test and potential-free boiler relay are standard. It is possible to purchase the Danfoss Icon app-module which provides access to app-control of the underfloor heating system via an iOS or Android device. The app-module also provides access to online updating of the Master Controller firmware (OTA). Cooling control and demand-controlled flow temperature can be purchased using the Danfoss Icon expansion module. The Master Controller is compatible with Zigbee 3.0 systems such as Danfoss Ally or 3rd party Zigbee systems. For Zigbee integration, the Danfoss Icon Zigbee module is used, which is connected to the Master Controller's app input.