Filling the heating system
Total permissible hardness of the fill and top-up water
Total heating output
kW
50
≤
50 to
200
>
≤
200 to
600
>
≤
600
>
Fig. 18
Venting the boiler by flushing
Single boiler system
B
Fig. 19
(cont.)
Specific system volume
< 20 l/kW
3
3.0 mol/m
(16.8 °dH)
≤
2.0 mol/m
3
(11.2 °dH)
≤
1.5 mol/m
3
(8.4 °dH)
≤
3
< 0.02 mol/m
(0.11 °dH)
A
A
Commissioning, inspection, maintenance
20 l/kW to < 50 l/kW
≥
3
2.0 mol/m
(11.2 °dH)
≤
1.5 mol/m
3
(8.4 °dH)
≤
0.02 mol/m
3
(0.11 °dH)
≤
3
< 0.02 mol/m
(0.11 °dH)
1. Check the pre-charge pressure of the diaphragm
expansion vessel.
2. Close the gas shut-off valve.
3. Filling the heating system:
■
Single boiler system: Valve
■
Multi boiler system: Valve
System pressure
1.0 bar (0.1 MPa).
>
4. Close boiler drain & fill valve
1. Close the shut-off valves on the heating water side.
2. Connect the drain hose to boiler drain & fill valve
.
B
3. Open valves
and
A
sure until no more air noise can be heard.
4. Close taps
and
A
B
the heating water side.
50 l/kW
≥
3
< 0.02 mol/m
(0.11 °dH)
< 0.02 mol/m
3
(0.11 °dH)
< 0.02 mol/m
3
(0.11 °dH)
3
< 0.02 mol/m
(0.11 °dH)
A
(see page 28)
F
or
.
A
F
. Vent under mains pres-
B
; open the shut-off valves on
27