Safety & Warnings

This product is a system component and is not suitable for separate operation. It consists of an electrical heating rod with permanently installed control unit. The product is designed for installation in a designated, liquid-filled radiator (e.g. heated towel rail or other suitable radiator). The liquid must be non-combustible, and must be specified by the radiator manufacturer or distributor or the professional installation engineer. These types of radiators are suitable for increasing and maintaining room temperature and/or for drying towels). When selecting the output (W) for the product, the information from the radiator manufacturer or distributor must always be complied with. The two parts (radiator and electrical heating system) must be precisely coordinated to one another. Any other use is considered improper use. Using the product in a way other than that described above, or in a way that extends beyond that described above, is considered improper use and could invalidate the guarantee. When using the product, it must also be ensured that the protection class (IP) of the product complies with the protection class requirements at the radiator installation location, and also with the protection zones in bathrooms where applicable.

The heating rod with control unit must be safely installed in a filled heated towel rail or equivalent radiator by a professional. A water/glycol mix should be used as a filling agent. Never use combustible or other hazardous substances. The control unit is connected to a grounded 230 V connector (class I), either directly into a socket via a plug connector (if this is permissible in the country in question) or to a terminal box fused where necessary (in accordance with local regulations). Please also observe the protection classes for electrical devices applicable in bathroom area. All of the listed steps must only be carried out by an appropriate professional. We accept no liability or obligations for incorrect installation or commissioning.

Useful Features

Excess temperature protection- The temperature information from the NTC inside the heating rod (for measuring the radiator temperature) and the NTC at the mains cable outlet (for measuring the room temperature) are used to ensure correct operation of the radiator, regulated by the control unit. If the automatic control system is faulty for whatever reason and the water temperature in the radiator is increasing in an uncontrolled manner, the system has two safety mechanisms to prevent excessive pressure in the radiator. Firstly, the entire system is completely shut down electronically when a water temperature of 95°C is reached. If this protection mechanism fails for whatever reason, a simple downstream thermal fuse ensures complete shut-down.

Frost Protection - The Flexi-NG control unit has an automatic frost-protection setting. This can both prevent the freezing of liquid in the radiator in extreme cases, and can also maintain a low room temperature. The default setting for the frost protection is between < 7°C and 15°C. If the radiator temperature falls below 7°C, the Rondo-NG heating system switches on automatically, heats the liquid in the radiator to 15°C and then switches off again. An ice crystal appears on the display. If the temperature falls to < 7°C again, the heating system will switch on again. This process is repeated continuously until the temperature increases to a value above 15°C again.

Room temperature compensation - As the NTC that measures the room temperature and feeds back information to the controller is located on the back of the controller, it is close to the warm radiator. The measured temperature will therefore not accurately reflect the temperature in other parts of the room. For this reason, there is an automatic temperature adjustment of - 3°C in the control unit.

Open window/door detection - This automatic function detects when the temperature falls by 2°C or more over a short period of time without any changes having been made to the control unit temperature settings. In this case, the system assumes that this reduced temperature is due to opened windows or doors. In order to save energy, the radiator heating system is switched off automatically where the heating system was in operation at the time. The controller checks the room temperature at regular intervals, and compares it with the stored measured value. The heating will remain switched off for as long as the difference increases. As soon as the temperature is no longer falling, the heating is switched on again and will follow its set programme. If the temperature falls below the 7°C mark while the temperature is falling, the frost protection (see above) will automatically switch on.

Note: This listing is for the WHITE model which does not come with a remote control.