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The RC20 room controller may only be used to operate and control. Buderus heating systems in houses and flats. The boiler must be equipped with EMS. Buderus. Logamatic; Logamatic; Logamatic; Logamatic; Logamatic; Logamatic; Logamatic; Logamatic; Logamatic; Logamatic; Logamatic; Logamatic; Logamatic . Buderus. Logamatic; Logamatic; Logamatic; Logamatic; Logamatic; Logamatic; Logamatic; Logamatic; Logamatic; Logamatic; Logamatic.

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For this reason, the reference temperature used by the system to heat the house is an outside sensor. This method, called by Buderus weather-compensated controlwas supposed to calculate the flow temperature in accordance with a heating curve configured.

Understanding the EMS Bus of Buderus / Nefit boilers

The DHW Once functionality should be, theoretically, activated by means of this data package. This data package contains status information about the Heating Circuit 1 HC1. Have a look at the references to find a more complete specification. Does the fan start? Before starting up a Greenstar boiler, remove the bleed screw on the front of the circulator pump and use a screwdriver to rotate the shaft. Apart from the jack, you will also find an EMS bus connection in the inside interface of the boiler.

Hi Dani, only just discovered this. Byte 11 contains additional information, out of the scope of this project. The parameters of the previous datagram are fully configurable. For instance, the hot water desired temperature is a typical value that you will want to control remotely from your domotic system.

The GB boiler is designed for r20rf of maintenance. Due to their situation, the room temperature measurement cannot be used to adjust the heating level. For this reason I budderus to search for ways to control the boiler remotely. You may also find it in products from Nefit, a company of the same group. Luckily, Buderus boilers use a partially-documented protocol to communicate the controllers with the heating modules.


Cross contamination is the recirculation of exhaust gases being pulled back into the boiler through it’s fresh air intake.

Detailed venting information can be found in section 6. These boilers are water tested, so the impellers may be static after storage, which would prevent circulation. It can be useful to modify one of the parameters of this last datagram.

However, it can also be requested. To change this value, just send this write command:. So, to know the time configured in the system you should send a read command poll first.

Buderus RC20RF (Mod.)Kablosuz Oda Kumandası – Kombi Parça Fiyatları

In case the web is not available, I have exported it as a PDF. This package type contains configuration options regarding the working mode of the DHW system. Byte 30 is the controller type 0 — no controller, 1 — RC20, 2 — RC3x. This message type contains the system date and time stored in the room controller RC The ionization rod can be one of many problems causing the boiler not to fire.

This status message contains specific information about the system. Note that if not otherwise indicated, all the values are transmitted using big endian order the most significant bytes are located at the lowest storage address. In the house where I am currently living there is an old Buderus boiler. They all use the same datagram structure, changing only the message type as shown in this table:. After some try and error, I have found that, for the RC35 Room Controller, values 39 and 7 for activation and deactivation work better.

The EMS bus is usually accessible though a 3,5 mm service jack located in the front panel of the boiler. To receive this data package, just send the following read command:. However, I have noticed that sometimes this values are directly ignored despite receiving an acknowledge datagram from the bus master.

In the previous answer table you can see that the Hot Water Desired Temperature parameter occupies byte 6. The EMS bus supplies a voltage of 12 volts to power the controllers.


All the existing addresses are queried once in rc20gf while by the bus master. Once this write command is sent, if the operation is successfully processed by the destination device, it will send an acknowledge message containing only one byte: These parameters are, as previous ones, fully configurable. It consists of an status message containing specific information about the working conditions of the hot water system.

Once sent, if the operation rx20rf successfully processed by the destination device, it will send an acknowledge message containing only one byte: In my case, the jack plug was protected under a tap in the BC Besides the default programs already defined in the controller, the user can create and edit two fully configurable programs with 42 switching points each per Heating Circuit.

To allow addressing each bus participant has its own identification. The bus master polls continuously to the rest of devices. For instance, when leaving the house for holidays, you can switch the DHW working mode to off.

The exact location of these clamps will depend on your installation. As you know I did something similar for an ESP A 3C error code refers to a bad connection to the fan or a faulty fan.

According to the EMS Wikiwhen the value in byte 4 is greater than 35, the function is started. This is a status message containing some information about the working conditions of the mixer.

When the value is 3, the function is stopped.

This data package can be addressed to a third device of the bus, which will answer the request immediately. Another very good source of information are the microcontroller forumsspecially these topics: