22 7219722 - 01 (04/15)
7 Maintenance
MainEco Heat
7.5 Draining the System
It may be necessary to drain the CH system if radiators need to
be replaced or removed, if there is a major water leak or if there
is a risk of freezing. Proceed as follows:
1. Open the valves of all the radiators connected to the
system.
2. Switch off or disconnect the boiler’s electrical isolation point.
3. Wait until all the radiators are cold.
4. Connect a drain hose to the lowest draining point. Place the
end of the hose in a drain or at a place where drained
water will not cause any damage.
5. Open the CH system drain valve. Drain the system.
WARNING
The CH water may still be hot.
6. When water stops flowing from the draining point, close the
draining valve.
See Section 7.4 Venting the system. If in doubt seek
advice from your installer.
After draining the concentration of system corrosion
inhibitor and anti-freeze may become excessively diluted -
seek advice from your installer.
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