Bedienungsanleitung Buderus RC25 - Logamatic EMS (Seite 28 von 36) (Englisch)

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Troubleshooting

Logamatic EMS RC25 programming unit - Subject to technical modifications

8 Troubleshooting

This chapter deals with frequently asked questions about your heating system. This will in many

cases enable you to eliminate suspected faults. At the end of the chapter you will find a table listing

faults and corresponding remedies.

8.1 Frequently asked questions

Why do I set a room temperature, even though it is not recorded?

When you set the room temperature – even if it is not recorded, as with weather-compensated

control – you are changing the heating curve. This changes the room temperature, because the

temperature of the heating water changes and with it the temperature of the radiators.

Why does the room temperature measured with a separate thermometer not correlate

with the set room temperature?

The room temperature is influenced by a number of different variables. If the RC25 programming

unit is installed on a cold wall, it will be influenced by the cold temperature of the wall. It will be

influenced by the heat from a fireplace or chimney, for example, if it is installed in a warm part of the

room. Therefore, a separate thermometer can indicate a different room temperature than that set at

the RC25 programming unit. To compare the actual room temperature with the values measured by

another thermometer, the following is important:

• The separate thermometer and the room controller must be physically close to each other.

• The separate thermometer must be accurate.

• When comparing, do not measure the room temperature when the heating system is heating up,

as the two devices may react at different speeds to the change in temperature.

If you have followed these instructions and you can still detect a discrepancy, you can calibrate the

room temperature display (Æ page 17).

Why do the radiators get too hot when the outside temperature is relatively high?

If you have a heating system with one heating circuit and no mixing valve (heating circuit 1), this is

normal. The pump only starts up when the boiler reaches a predefined flow temperature. If the flow

temperature is higher than required based on the outside temperature, the radiators may get hotter

for a short time. The heating control unit detects this and responds accordingly after a short time.

Do not adjust the thermostatic valves on the radiators and wait until the set room temperature is

reached. Even in summer mode, radiators may be heated briefly under specific circumstances:

namely when the pump is started up automatically at a predefined interval to prevent it from “seizing

up” (jamming). If the pump happens to start immediately after DHW heating, the unusable residual

heat is dissipated via the heating circuit and the radiators.

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