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7.4
Venting the System
1
2
10
A
6
7668909-04 (12/19)
3
4
5
C
B
7
If any air is present in the appliance or system it must be
removed in order to prevent nuisance noises that may occur
during operation. The boiler has an inbuilt auto air vent to aid
the removal of air and is supplied in the open position. Proceed
as follows:
1.
Open the valves of all the radiators connected to the
system.
2.
Set the room thermostat to the highest possible
temperature and any timers to 'ON'.
3.
Wait until the radiators are warm.
4.
Switch off the boiler.
5.
Vent the radiators. Work from the lowest radiator in the
property.
6.
Open the bleed vent with the key, keeping a cloth
pressed against the vent.
7.
Wait until water comes out of the bleed vent and then
close.
WaRning
The CH water in the radiators will still be hot.
8.
Switch the boiler on.
9.
After venting, if the system is of the sealed (pressurised)
type check that the water pressure is still adequate.
For sealed systems - if the water pressure is lower than
0.7 bar, the water must be topped up (recommended
water pressure between 1.0 and 2.0 bar when the
system is cold).
10. Reset the room thermostat to the desired temperature.
Maintenance
7
200 Heat
21
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