Draining The Central Heating System - PENSOTTI PCH 18 Instruction Manual

6.5 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);
MAINTENANCE INSTRUCTIONS
Fig. 1
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