Quick Links. Download this manual. Operating Instructions. Read carefully before use. Table of Contents. Troubleshooting Troubleshooting 78 Simple troubleshooting 79 Troubleshooting

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Manual zz. Correct use. Symbol key. Please observe these notes. Cleaning the control unit. Control unit controls. MEC2 programming unit. Switching on the control unit Switching off the control unit. Permanent display. Selecting the operating mode. Setting the room temperature. Heating DHW. Extended functions 7. Controlling the extended functions. Displaying operating values. Changing the permanent display. Setting the date and time. Selecting a heating circuit.

Adjusting the room temperature for another heating circuit. Heating circuits with MEC2 programming unit. Selecting and modifying a heating program. Selecting a standard program. Summary of standard programs. Setting the DHW operating mode. Setting the operating mode for DHW circulation. Setting the holiday function. Contents 7. Setting the pause function. Room temperature matching. Automatic maintenance message. Creating a new heating program. Creating a new DHW program. Creating a new DHW circulation pump program.

Thermal disinfection. Modules and their functions. FM function module accessory. FM function module Logamatic 10 Boiler flue gas test.

It offers you optimum heating convenience and minimum energy consumption. The control unit enables you to operate your heating system to be able to combine your economical and ecological aspirations.

Of course, your personal comfort is always priority. The control unit, which is regulated by the MEC2 programming unit, is set up at the factory for immediate use. Naturally, you or your heating contractor can modify these default settings and adapt them to your individual requirements.

The MEC2 programming unit is the central control unit. Some functions which you may need are located behind a flap. The keys behind this flap enable you to make various adjustments. The control concept is: "Push and turn" "This control unit speaks your language".

Your heating system offers a wealth of further useful functions. What you should know about your heating system 2 2 What you should know about your heating system Why should you become more familiar with your heating system?

Advanced heating systems offer many functions for saving energy without sacrificing comfort. Getting to know this heating technology may appear daunting at first, but after a short while you will recognise the advantages you can gain from a heating system that is set up to meet your personal requirements. The more you are aware of the options offered by your heating system, the greater the benefit you will be able to draw from it.

How does your heating system work? Your heating system comprises the boiler with burner, heating control unit, pipework and radiators. A DHW cylinder or an instantaneous water heater heats the water required for a shower, bath or washing your hands. Subject to the way your heating system has been installed, it can operate either purely as a central heating system or together with a DHW cylinder.

The important thing is that the various components match each other. The burner combusts fuel e. Using pumps, this hot water is transported through the pipework to the consumers radiators, underfloor heating system, etc. Logamatic , and - Subject to technical modifications. This heating water is transported by the pump [3] through the flow line [4] to the radiators [6]. The heating water flows through the radiators, and in doing so, gives off some of its heat.

The heating water flows back to the boiler via the return line [7], where the cycle starts again. The room temperature can be adjusted to your personal requirements using the thermostatic radiator valves [5]. All radiators are supplied with the same flow temperature.

The heat transferred to the room depends on the radiator surface and the heating water throughput. Therefore, the heat transfer can be manipulated via the thermostatic radiator valves. What you should know about your heating system 2 Why do you need a control unit? The control unit ensures convenient heat and economical consumption of fuel and electrical energy. It starts the heat source boiler and burner and pumps when warm rooms or DHW are required.

In doing so, it utilises the components of your heating system at the correct time. Furthermore, your control unit records different variables that influence the room temperature and compensates for these. What does the control unit calculate? Advanced control units calculate the temperature required within the boiler the so-called flow temperature subject to the outside temperature. The relationship between the outside temperature and the flow temperature is described as the heating curve.

The lower the outside temperature, the higher the flow temperature must be. The control unit can operate in three control modes: — Weather-compensated control — Room temperature-dependent control — Weather-compensated control with room temperature hook-up Fig.

Heating circuit curve example x Outdoor temperature y Flow temperature 7 2 What you should know about your heating system Weather-compensated control With weather-compensated control, only the outside temperature captured by the outside temperature sensor is decisive for the flow temperature level.

Room temperature fluctuations through radiant energy from the sun, occupants, open fireplaces or similar external heat sources are then ignored. If you utilise this type of control, adjust the thermostatic radiator valves so that the required room temperature is achieved in the different rooms. Room temperature-dependent control A further possible heating control method is room temperature-dependent control. The control unit calculates the flow temperature based on the set and actual room temperature.

To be able to utilise room temperature-dependent control, you need a room that is representative of your whole home. All factors influencing the temperature in this "reference room" — where the programming unit is located — will also apply to all other rooms. Not every home has a room that meets these requirements. Pure room temperature-dependent control has, in such cases, certain limitations. Should you, for example, open a window in the room where the room temperature is measured, the control unit will "think" that you have opened the windows in every room in your house and will begin to heat vigorously.

Or the reverse might apply: You measure the temperature in a south-facing room with different heat sources solar or other heat sources, e. Now the control unit "thinks" that it is as hot in every room as in the reference room; consequently the boiler output will be severely reduced so that, for example, the north-facing rooms will become too cold. Weather-compensated control with room temperature hook-up Weather-compensated control with room temperature hook-up combines the advantages of the other two control modes.

The required flow temperature, which is mainly subject to the outside temperature, can be adjusted by the room temperature only to a limited degree. This achieves improved maintenance of the room temperature within the room containing the programming unit, without completely ignoring the other rooms.

With this kind of control you will also need to keep all thermostatic radiator valves in the reference room fully open. Why do the thermostatic valves have to stay fully open? If, for example, you want to reduce the room temperature in the reference room, and you therefore close the thermostatic valve further, the flow rate through the radiator is reduced and, therefore, less heat is transferred to the room.

This reduces the room temperature. The control unit will endeavour to counteract the drop in room temperature by raising the flow temperature. However, raising the flow temperature does not raise the room temperature, as the thermostatic valve continues to limit the room temperature. An excessive flow temperature results in unnecessary heat losses from boiler and pipework. At the same time, the temperature in all rooms without thermostatic valves increases due to the higher boiler water temperature.


Logamatic 4121

These service instructions are designed for installers who, due to their training and experience, are familiar with heating systems and water installations. Only carry out this service work if you possess these skills. Explain to the customer the function and operation of the related units. Carefully read these service instructions before commencing any work on the control panel. Make sure that any electrical work is only carried out by authorised, trained personnel. Before opening the control panel: Isolate all poles of the control panel and secure against unauthorised re-connection. The heating system can freeze up in cold weather if it has been switched off.


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Service instructions. Logamatic 4121, 4122 and 4126 control unit /2004 GB For installers


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