Installation & Servicing instructions ATAG iS-Range
36
11 Filling system
The central heating installation needs to be filled with potable water according to the requirements in chapter
9.3 'Water quality'. For filling or topping up the heating system the installation must be provided with a filling
loop or a fill and drain valve to connect a garden hose i.e.. Use the filling loop according to the following
procedure:
1
Attach the filling loop pipe to the filling loop assembly;
2
Open the filling loop valves;
3
Slowly fill the central heating system up to 1.2 – 1.5 bar;
(at the bottom left a pressure gauge indicates the water pressure in the central heating system)
4
Close the filling loop valves;
5 Vent the entire heating installation starting at the lowest point;
6 Check the water pressure and top up if necessary to 1.2 – 1.5 bar;
7
Check the filling loop valve is closed;
When powering up the boiler (described in chapter 13) an automatic de-aeration program will run to vent the
boiler. During this program the pressure in the central heating needs to be checked, and when necessary,
topped up again.
It may take some time before all the air has disappeared from a filled installation. Certainly during
the first week sounds may be audible that indicate air. The automatic air vent in the boiler will let this
air escape, causing the water pressure to drop during this period and water will need to be refilled
again.
Always remove the filling loop pipe or garden hose after filling or topping up the heating system and
close the connections with a cap nut.
