Bi-directional wireless controller 868 MHz

LET4***

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

Bi-directional wireless controller 868 MHz

LET4***

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