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The straight or angled connectors for quick and secure connection of two pipe ends can be easily loosened again. To do this, turn one side of the connector anticlockwise and hold the collet clamp pressed down while pulling it off. The connector can now be easily removed from the PE-RT pipe.

The exact procedure is shown in the manufacturer's video:

• https://www.youtube.com/watch?v=mpjG-BdLHLI

The Multibox 4K-RTL for connecting a retrofitted underfloor heating system to the existing heating system has a flow shut-off valve in addition to the RTL valve. The flow shut-off valve is particularly useful when individual heating surfaces need to be serviced or repaired. In these cases, the water does not have to be removed from the entire heating system. It is sufficient to drain the affected heating area.

In addition, the Multibox housing is dimensioned so that even the quadruple distributors for connecting up to 4 heating circuits fit comfortably in the flush-mounted box. They are covered by the housing and protected from direct contact with building chemicals.

All features of the Multibox 4K-RTL

The aim of hydronic balancing is to ensure that all heating circuits of the underfloor heating system are evenly supplied with heating water. This ensures that the system temperatures are maintained over the entire area and that the heating system can work efficiently. The German Building Energy Act even stipulates that all devices in a heating system must be hydraulically balanced. The Multibox RTL has a special thermostatic head to simplify hydraulic balancing. We have summarised detailed information on the procedure in a PDF.

PDF Hydronic balancing

FLEXIRO radiant heating systems are installed in accordance with the Tichelmann principle. The heating circuits are designed so that they have identical pipe lengths. For circuits with shorter flow pipe, the return pipe must be extended accordingly to ensure that the total pipe lengths remain comparable. This prevents shorter heating circuits from receiving more heating water and longer heating circuits with higher pressure resistance from heating up less.

With the thin 10 mm pipes, hydraulic resistance is more important than with conventional pipe diameters. To ensure that the retrofitted underfloor or ceiling heating system functions reliably with most heating systems and connection scenarios, the length of the heating circuits has therefore been limited to 30 m plus supply. The equal length of the heating circuits ensures optimum hydraulics. Hydraulic balancing is generally no longer necessary. The disadvantage is that the pipe lengths must be aligned with the longest heating circuit.

We are a manufacturer of components for ceiling heating systems. We cannot provide planning or installation services. In individual cases, however, we can put you in touch with an HVAC installation company. If you send us the key details of your modernisation project, we can match the location with our database of installers.

You are a HVAC company and would like to install FLEXIRO sets? Please get in touch with us.

Inquiry form for installers

The weight of the ceiling heating with plastic pipe is 9.05 kg/m² when filled with water. The copper pipe variant weighs 12.58 kg/m².