14
Operating manual atmoCRAFT
Danger!
If the unit still does not start after repeating
the fault resolution process three times, then
an authorised heating engineer must be
consulted to check the unit.
4.8.6 Filling unit/heating installation
2
1
0
6
5
4
3
bar
1
Fig. 4.15 Checking the filling pressure of the heating
installation (pressure gauge not included)
For the heating system to operate properly, the pointer
on the pressure gauge (
1
) must be between 1.0 and 2.0
bar filling pressure when the system is cold. If it is less
than 0.75 bar, then water should be added.
If the heating system extends over several storeys, the
system may require a higher filling pressure. Ask your
engineer for details.
Caution!
Danger of damage to the gas boiler.
Use only clean tap-water to top up the heating
system.
The addition of chemicals such as e.g. frost and
corrosion prevention materials (inhibitors) is
not permitted.
Otherwise it could result in damage to seals
and diaphragms as well as noises in the heating
operation.
Vaillant assumes no liability for this and such
consequential damages.
To fill up and to refill the heating system, you can
normally use tap water. However in exceptions, the water
quality might not be suitable for filling in the heating
system (heavily corrosive or extremely calciferous
water). In a case such as this you should please contact
your authorised heating engineer.
Proceed as follows to fill the installation:
• Open all thermostatic valves in the installation.
• Connect the filling tap of the installation to a cold
water draw-off valve with a hose (your heating
engineer should have shown you the filling fittings and
explained the filling and draining of the system).
• Open the filling cock slowly.
• Turn the filling cock and the tap on slowly and add
water until the required installation pressure is shown
on the pressure gauge (
1
).
• Turn the tap off.
• Vent all the radiators.
• Then check the system pressure on the pressure
gauge (
1
) and add more water if necessary.
• Close the filling cock and remove the filling hose.
4.9 Shut-down
1
Fig. 4.16 Switching the unit off
To shut down your gas wall boiler, turn the main switch
(
1
) to the "0" position.
Caution!
The frost protection and monitoring systems
are only active when the main switch of the
appliance is in the "I" position and it is not
disconnected from the mains power supply.
To ensure that these protection devices remain active,
switch your gas boiler on and off in normal mode using
the controller (see the corresponding operating manual).
4 Operation
