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5. Checking and maintenance
5.5
Draining the installation
T000185-A
29
8. Wait until water comes out of the bleed valve and then close the
bleed connection.
CAUTION
The water may still be hot.
9. Switch on the boiler. A vent cycle of a duration of around 3 minutes
is carried out automatically.
10.After venting, check whether the pressure in the installation is still
sufficient.
If the water pressure is lower than 0,8 bar, more water
should be added. If necessary, top up the water level in the
heating system (recommended hydraulic pressure
between 1,5 and 2,0 bar).
¼ See chapter: "Filling the system", page 26
T000218-A
11.Set the heating set point.
It may become necessary to empty the water from the heating system
when the radiators have to be replaced, should there be a major water
leak or a risk of frost. To do this, proceed as follows:
1. Open the valves on all radiators connected to the heating system.
T000181-B
2. Switch off the boiler electrical power supply.
3. Wait around 10 minutes until the radiators are cold.
MCA 15 - MCA 25 MCA 25/28 MI
23/08/2011 - 300024159-001-B
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