MAINTENANCE INSTRUCTIONS
32
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);
Fig. 1
