DeDietrich MCR 24, MCR 24/28MI, MCR 30/35MI, MCR 34/39MI Manual page 15

Bleeding the heating system
It is essential that you bleed any air in the calorifier, the conduits or
the taps to prevent the annoying noises likely to be produced during
heating or when drawing off water.
- Open the valves on all radiators connected to the heating system.
- Set the room thermostat as high as possible. Wait until the
radiators are hot.
- Switch the boiler off.
The radiators are cold.
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- Bleed the radiators.
- Open the bleed connection using the bleed key provided whilst
keeping a rag pressed against the connection.
MCR 24, 24/28MI, 30/35MI, 34/39MI
15