INSTALLATION INSTRUCTIONS
56
6.6 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
water heater.
• Switch off the power supply to the water heater.
• Wait for the water heater 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 water heater 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 water heater on the pump
manifold (see fig. 1);
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Draining the domestic hot water system
If there is a danger of freezing, the domestic hot water system should be drained. This can be done as follows:
• Close the mains water supply valve.
• Open all the hot and cold water taps.
• On completion, close all the previously opened taps.
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