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Bi-directional wireless controller 868 MHz

LET4***

Bi-directional wireless controller 868 MHz
How energy efficiency is improved
Protected, intelligent solution for optimal energy use.

Areas of application
As a bi-directional receiving station for the signals from the analogue LRT410 room thermostats and the digital LRA420 and LRA450 room operating units, the LET4*** is used as a single-room controller for every channel and for activating thermal actuators in underfloor heating control systems. The individual controllers communicate using a bi-directional signal. The pulses of the radio thermostats can be individually assigned to the corresponding channels.

Properties
  • Intelligent bi-directional wireless controllers for heating/cooling
  • Reception frequency: 868.3 MHz
  • Versions with or without LAN connection
  • LEDs for the functions, communication and operating modes
  • One LED per channel for visualisation and confirmation of the channel assignment
  • Emergency function when there is no signal reception
  • Individual configuration for every channel accessible from the outside
  • Integrated pump logic and potential-free output contact
  • With heating/cooling input and potential-free and configurable output
  • Input for monitoring the supply temperature
  • Input for monitoring the relative humidity

Technical description
  • Black housing (RAL9005) with transparent cover
  • Versions with 4, 8 and 12 channels
  • Including a transformer for the 24 V version
  • Monitoring of the inputs and state of the controller with LEDs
  • 24 V version with triac outputs for thermal actuators
  • 230 V version with relay outputs for thermal actuators
  • Automatic connection terminal, depending on the channel, 1 or 2 actuators/channel
  • Maximum number of thermal actuators with 12-channel version: 16
  • SD card for software update accessible from the outside
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