Underfloor heating equipped with an RTL thermostatic valve prevents medium exceeding the permissible value from entering the pipes. Assuming that the permissible floor temperature is 27°C, a heating parameter ranging from 27°C to 29°C will be required to achieve it. Check how to use RTL thermostatic valves for underfloor heating installations? How is the RTL valve installed correctly?
Check out RTL valves at the Onninen wholesaler
How to properly install the RTL valve?
The installation method of the RTL valve depends on the type of valve that has been selected. In the case of a straight or angle valve, it is recommended to mount it on the manifold beam. In this way, you can create even several underfloor heating loops (each loop with its own RTL valve).
The return temperature limiter should be installed on the return from the radiator, but remember to reduce the medium temperature to 27 to 29°C in heating systems combining underfloor and radiator heating. This level is sufficient for the room temperature to reach 20°C. It is also important that installing a temperature limiter in the system eliminates the need to install a mixing valve with an additional circulation pump.
Two types of boxes with an RTL valve are most often used:
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with a valve limiting the return temperature, where it is only possible to control the temperature of the flowing water; - with an additional thermostatic valve, which extends the valve's functionality by maintaining the temperature in the bathroom at a constant level.
In the case of the second option (thermostatic sensor), the RTL valve actually consists of two valves. The first one controls the temperature of the flowing water (heating medium), while the second one reads the temperature in the room. Both valves function independently of each other.
As a result of this solution, too high a temperature of the heating medium will cut off the flow, which protects the entire installation against overheating.
The use of RTL valves in underfloor heating systems
An underfloor heating system with an RTL valve is generally considered to be a simple hydraulic system, which results from the fact that the heating medium powers the loop without the use of additional devices. It is worth remembering that the RTL valve should be installed in one or at most two rooms (up to 20 m²). Otherwise, the floor temperature will be uneven. For larger areas, a manifold with a mixing and pump group is used. In any case, do not neglect the installation of the air vent.
RTL valves in the Onninen wholesaler
The simplicity of the design of the underfloor heating system using RTL valves contributes to the systematic increase in the popularity of this solution. Additionally, reducing the number of underfloor components significantly reduces installation costs. Let's check which valves will be the most effective.
The Flamco er-RTL white control valve is a two-way valve enabling precise regulation of the air temperature in the room and limiting the temperature of the heating medium in the underfloor heating system. Easy installation is ensured by a set of valves with an air vent and a 3/4 male conical thread. The whole is complemented by a white protective cover made of plastic.
Another solution worth attention will be the Danfoss FJVR 15 angle RTL valve + 10-50 white head . This angle valve is equipped with a 1/2 inch inlet and outlet port. The working pressure is 10 bar and the Kvs value [m³/h] is 0.68 m³/h.
The Flamco RTL 1/2" control valve is ideal for small underfloor heating areas of up to 15 m². It is suitable for use in combined underfloor and radiator heating installations. The working pressure of the RTL valve is 1.5 MPa with an operating range within from 10 to 50°C.