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6.4
Venting the heating system
Fig.17
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2
11
4
B
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7745361 - v03 - 29112021
15. Put the boiler back into operation after the central heating system has
Any air in the boiler, pipes or valves must be vented in order to prevent
annoying noises that may be generated during heating or when drawing
water.
1. Open the valves of all the radiators and/or underfloor heating circuits
2. Set the room thermostat to the highest possible temperature.
3. Wait until the radiators are warm.
4. Shut down the boiler.
5. Wait approximately 10 minutes, until the radiators feel cold.
6. Bleed the radiators. Work from the lowest to the highest.
7. Open the venting valve with the bleed key, keeping a cloth pressed
3
8. Wait until water comes out of the venting valve and then close the
9. Start the boiler.
5
10. After venting, check that the water pressure in the system is still
6
11. Adjust the room thermostat or temperature control.
C
A
8
MW-2000560-1
been filled and vented.
Important
Filling and venting the central heating system twice a year should
be sufficient to maintain the correct water pressure. If it is often
necessary to top up the central heating system with water, contact
your fitter
connected to the system.
against the vent.
Warning
The water may still be hot.
venting valve.
Important
After the power is switched on, the boiler always runs through an
automatic venting program lasting approx. 3 minutes.
adequate. If necessary, top up the water level in the heating system
6 Maintenance
DIEMATIC Evolution - C140
23
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