MAINTENANCE INSTRUCTIONS
RK 100 - RAD - ING - MAN.INST - 1311.1 - DIGITECH CS MIAH4
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6.4 Draining the central heating system
If the need arises to drain the system, this can be
done as follows:
Switch the system to “WINTER” mode and ignite
the boiler.
Switch off the power supply to the boiler.
Wait for the boiler to cool down.
Connect a hosepipe to the system drain point and
locate the other end of the hose in a suitable
drainage system.
Open the system drain valve (see fig. 1).
Open the air vents on the radiators, starting with
the highest and moving down the system to the
lowest.
When the system has been drained, close the
radiator breather valves and the drain valve.
If only the boiler needs to be drained, close
the flow/return isolating valves on the heating
circuit and open the drain valve located at the
bottom of the boiler on the pump manifold
(see fig. 1);
6.5 Boiler deactivation
When the applicance is no longer required for use,
the necessary operation (disconnect the applicance
from the main electricity / gas / water supply) must be
made by qualified personnel.
Fig. 1
