Multibox 4K-RTL - Underfloor Heating Temperature Control

The Multibox 4K-RTL with RTL valve, flow shut-off and vent valve is suitable for all common heating systems. It can be used in conjunction with conventional heating systems requiring flow temperatures of up to 70°C as well with radiant heating systems.

Additionally to a return temperature limiter the Multibox contains a thermostat, which allows the integration into a smarthome system. In order to achieve that you can easily replace the installed thermostatic head with a smarthome ready radio thermostat. The threaded connection must be 30 × 1.5 mm.

RTL valve - How it works

For a safe operation of the retrofitted underfloor heating, the RTL Multibox limits the return flow temperature to a maximum of 50°C. Thus, it forms the connecting piece between the existing heating system and the underfloor heating. It regulates the temperature in retrofitted rooms such as bathrooms or kitchens completely independently of the existing heating system and ensures a maximum of heating comfort.

The temperature is controlled without additional auxiliary energy and can be easily adjusted individually using the supplied return temperature limiter head. This functions as a continuous proportional controller. The change in the indoor air temperature (controlled variable) is proportional to the change in the valve lift (manipulated variable). If the indoor air temperature rises, the temperature in the temperature sensor expands and acts on the corrugated pipe. This throttles or increases the water supply in the underfloor heating circuit by the valve spindle.

An integrated vent valve ensures that all gases in the system, especially air, are removed from the system. It also contains a regulating spindle with which hydraulic balancing can be carried out.

The RTL Multibox is a flush-mounted box with frame and fastening rails. An included cover plate ensures a valuable look. The integrated supply shut-off means that heating surfaces can also be shut off individually.

The existing heating pipes are connected to the 3/4" connections of the Multibox with compression fittings. The FLEXIRO underfloor heating is connected completely tool-free via a plugin-system. Installation dimension for the Multibox in mm (H×W×D) 190×240×60.

• RTL valve
• Supply shut-off
• Vent valve
• Regulating spindle for hydraulic balancing
• Flush-mounted box with frame, mounting rail and cover plate
• Installation dimensions in mm (H×W×D) 190×240×60
• Threaded connections (Eurokonus) 3/4"
• Smarthome integration possible