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👉 Check Latest PriceWebasto Uni-Control Timer for new and existing installation with 4 pin plug connection. Key features include; Automatic heater detection 7 Day timing (3 programmes per day) Compatible with both 12v and 24v systems Robust rotary-push button Compatible with Airtop 2000STC Airtop Evo 40/55 heaters and Thermo Top water heaters Upgrade from rotary rheostat- box includes adapter wiring harness to standard 4 pin plug 7 days auto-timerWith the installed auto-timer up to 3 different timer slots can be pre-programmed per day.The simple menu lets you generate individual start and stop times.All programmed and activated start-stop times can be seen in the overview function Automatic detection of W-Bus heaters Webasto Air Top 2000STCWebasto Air Top Evo 40Webasto Air Top Evo 55Webasto Thermo Top EVOWebasto Thermo Pro 50 90Webasto Thermo Top Pro 120 Analog switching compatible heaters Webasto Air Top 2000 STWebasto Air Top Evo 3900 Webasto Air Top Evo 5500Webasto Thermo Top C E ZWebasto Thermo 90 STWebasto Thermo 230 300 350 Automatic heating device recognition is used to simplify the application and the installation of a WBus compatible heating device with a UniControl control unit. It is not necessary to select a heater during initial installation when the controller is connected via the WBus. Technical Specification Weight 55g *Operating temperature range -40 to +70 °C Storage temperature range -40 to +90 °C Heater connection W-Bus / analog Nominal voltage 12 V / 24 V Operating voltage range 10 V to 33 V Standby current 0,8 mA Max. permanent output current 500 mA (overload detection) Please note; For directly upgrading 1531 Timer please see part number 9035521B with adapter harness Â