User manual HRE-serie version 6, November 2013
11
Figure 7
Figure 8
4.1.6 Filling the central heating system
The pressure in the system should:
Never be lower than 0,5 bar cold;
Never be higher than 2,5 bar hot.
Follow the procedure below for filling the CH-system (see
figure 7):
Switch off the boiler;
Remove nob 4
Screw the adaptor 3 at the thread,
Connect the filling tube at 3 and open 5 by turning it;
Fill the system slowly with water, until the pressure
indicator indicates a pressure of 2 bar;
Close the valve (2);
Bleed the CH-system;
If necessary, fill with water again up to 2 bar of pressure;
Switch on the boiler and let the pump run for about 5 minutes;
Switch off the boiler;
Check the water pressure, if it is too low, repeat steps 5 through 10;
Remove the hose.
Hint:
The CH-system can be filled with cooling fluid, suited for CH-systems (pH-
value 8.5)
Bleeding the circulation pump
See instruction manual
Attention:
When locking pump couplings are
supplied with the boiler, the adjusting
grooves must point towards the
pump.
