Atag Q 25S - Replenishing the Central Heating

The central heating installation needs to be filled with potable (drinking) water.
For topping up the installation you use the filling loop according to the following
procedure:
(If in any doubt please contact your dealer)
1
Switch all functions off (heating, DHW and pump);
3
Slowly open the filling loop (Indication on display increases);
5
STOP appears on the display;
7
De-aerate the complete installation, start at the lowest point;
9
Close the filling loop;
11 If A xx appears on the display, wait for 17 minutes;
13 Close the filling loop;
15 Be sure that the filling loop is closed.
Q
After the automatic de-aeration programm (A xx) is finished the boiler will
return to the Good reading or Technical reading.
10
Operating
instructions
14 Press the ‘STEP’-button;
12 Check the waterpressure and if necessary top it up to 1,5 to 1,7 bar
10 Activate functions required (heating , DHW and/or pump );
8 Check the water pressure and if necessary top it up;
6 Close the filling loop;
4 Fill up slowly to 1.5 to 1.7 bar;
2 Briefly push the 'STEP'-button: P x.x = water pressure in bar;
Replenishing the central heating system