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Smart thermostat mounted on decorative wall
RAMSES 850 top3 OT - Image 2
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RAMSES 850 top3 OT

  • Digital clock thermostat in flat design for time-dependent monitoring and control of room temperature
  • Operation on device or via app
  • Power supply via OpenTherm bus


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RAMSES 850 top3 OT

RAMSES 850 top3 OT

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Item no.:8509200

The RAMSES 850 top3 OT is a modern digital clock thermostat designed for time-dependent room temperature control in homes, apartments, and offices. Powered directly via the OpenTherm bus, it enables seamless communication with modulating gas condensing boilers and other OpenTherm-compatible heating systems.

It can be operated on the device or via app with Bluetooth Low Energy (BLE), ensuring simple, secure control without requiring internet access. Users can configure 3 weekly programs plus comfort, eco, and setback modes through the app or device for optimal energy savings.

The thermostat includes an illuminated display, external input options (room sensor, floor sensor, motion detector, or telephone contact), and a PI room controller with adjustable room influence for precise heating regulation. With <0.2 W standby consumption, a 4-hour power reserve, and wall or flush-mounted installation, the RAMSES 850 top3 OT combines efficiency, flexibility, and modern control for advanced heating systems.

Function description

  • Digital clock thermostat in flat design for time-dependent monitoring and control of room temperature
  • Operation on device or via app
  • Power supply via OpenTherm bus
  • Direct Bluetooth Low Energy (BLE) connection between app and clock thermostat, no communication via the Internet
  • Settings configured conveniently via the app with intuitive operation from a smartphone or tablet
  • Installation on flush-mounted box or wall installation possible
  • Increased user convenience
  • Communication with the heating unit via OpenTherm bus
  • 3 individually programmable weekly programs, as well as comfort, eco and setback function
  • Suitable for energy-saving room temperature regulation in houses, apartments, etc.
  • Illuminated display through keystroke
  • External input for the flexible connection of the external room temperature sensor, floor sensor, motion detector or telephone contact
  • PI room controller, controlled by atmospheric conditions, with or without room influence
  • Preset with three modifiable weekly programs for heating and one for tap water
  • Suitable for modulating gas condensing boiler systems and modulating heating systems with OpenTherm interface

Technical data

Specification Details
Installation type Wall installation (also on flush-mounted socket possible)
Setting range temperature 2°C … 30°C
Type of connection 2-way conductor (BUS) room controller
Program Weekly program, Daily program, Holiday program, 3 basic programs
Number of memory locations 42
Power reserve 4 hours
Stand-by consumption <0.2 W
Type of protection IP 40
Protection class III according to EN 60 730-1

Downloads

Instruction Manual PDF Instruction Manual
Datasheet PDF Data sheet
User Manual PDF User Manual

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