7.2.2
Venting the installation
It is essential to eliminate any air in the boiler, pipes or fittings because
this can cause irritating noise during heating or the intake of water. To do
this, proceed as follows:
Important
Take care as the water might still be hot.
Important
If the hydraulic pressure of the water in the central heating
system is below 0.8 bar, it is advised to increase the pressure
(the recommended hydraulic pressure is 1.0 - 1.5 bar).
Fig.10
Venting the installation
BO-0000026
1
2
3
4
C
1
A
B
C
D
7 Maintenance
1. Open the valves (A & B) of all the radiators connected to the central
heating system.
2. Set the ambient thermostat as high as possible.
3. Wait for the radiators to heat up.
4. Set the ambient thermostat as low as possible.
5. Wait about 10 minutes until the radiators have cooled down.
6. Vent the radiators. Start with the lower floors.
7. Open the vent valve (C & C1) holding a cloth (D) against the valve.
8. Wait until water comes out of the vent valve and then tighten it
again.
9. After venting, check that the system is still at sufficient pressure.
7.3
Maintenance message
The purpose of this function is to warn the user that the boiler requires
maintenance.
flashes,
When the letters SVC appear on the screen and the symbol
the boiler requires maintenance. Contact your installer.
Fig.11 Maintenance message
400 Combi 2
19
1.
Fully open one of the taps first, and then while watching the pres
sure gauge, carefully open the second tap.
Note
The system pressure is shown at all times on the display when
there is power to the boiler.
2.
When the figures on the display
indicate between 1 and 1.5 bar turn
both taps off.
3.
Disconnect the filling pipe from the taps (a small amount of water
may be present) and remove it. Keep the pipe in a safe place for fu
ture use.
4.
If blanking caps are available fit them to the taps.
Note
Go to the "How to videos" section of the "Advice" page at
www.baxi.co.uk for further details.
5.
When the correct pressure is restored the boiler will reset automati
cally.
Fig.
45
Filling loop
PN-0000260
