Temperature controller LK 120 SmartComfort RT
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Temperature controller LK 120 SmartComfort RT

Temperature controller LK 120 SmartComfort RT is an electronic indoor temperature controller for hydronic radiator and underfloor heating systems. We don't sell the LK Armatur products to outside of Estonia!

€387.35 (tax incl.)
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Temperature controller LK 120 SmartComfort RTBy measuring the supply and indoor temperatures LK 120 SmartComfort RT regulates the mixing valve to provide the system with the exact amount of heat required in the building at any given time.

LK 120 SmartComfort RT has an automatic choice of direction to adapt to the direction of the mixing valve. LED-indicators show if the controller is opening or closing the valve. The supply temperature can be limited with a minimum and a maximum value. Symbols on the controller show the chosen function and the LED display shows the setting or value of the function. Adjustments are easily made with the push buttons marked “+” and “- “.

LK 120 SmartComfort RT is delivered with a room temperature unit allowing easy setting of the desired indoor temperature.
The room temperature unit is with fixed cable. For further energy saving and increased comfort there are nine preset programs with scheduled temperature changes. You can also create your own programs. Additional functions such as holiday and timer settings are available.
After a temperature setback the room temperature unit applies a booster function which briefly increases the supply temperature in order to quickly reach the desired room temperature.
Should the room temperature unit sense a sudden change in temperature, such as when airing a room, the unit disregards this change for the following half hour.
The room temperature unit is equipped with a connection port for external control, such as via a GSM modem, making it possible to activate a preset temperature change via mobile phone.

LK 120 SmartComfort RT is easy to install onto new as well as existing mixing valves. Mounting kits for  installation onto mixing valves of other brands are available - see separate page.
The plug-in adapter provides quick and easy do-it-yourself installation. In case of a power outage the controller will keep its settings and the actuator will stop in its current position. By disengaging the controller, the mixing valve can be manually operated.

LK 120 SmartComfort RT itemsItems included

  • Temperature controller
  • Adapter
  • Mounting kit for mixing valve
  • Supply temperature sensor with 1 m cable
  • Room temperature unit SmartComfort RT with 15 m cable


Technical data
Primary voltage, adapter 100-240 VAC, 50/60 Hz
Secondary voltage, adapter 24 VDC
Ambient temperature, actuator Min. 0°C/Max. +50°C (in operation)
Min. supply temperature +5°C - +40°C
Max. supply temperature +20°C - +99°C
Power consumption < 3 VA
Angle of rotation 90°
Torque 5 Nm
Protection class, actuator IP 40
Manufacturer: LK Armatur AB

Room temperature unit SmartComfort RT:
Ambient temperature Min. 0°C/Max. +40°C
Control range Min. +5°C/Max. +35°C
Protection class IP 20

An outdoor temperature sensor is available as an accessory.

SmartComfort LK 110, 120, 130 instruction manual >>

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