Pre-Charge Values Of Expansion Vessel And Filling Pressure - AOSmith MVI 103 Notice D'installation Et D'utilisation

9.4 Pre-charge values
of expansion
vessel and filling
pressure
9.4.1
9.4.2
82
MVI pompstation / MVI pump station / station de pompage MVI
The pre-charge value differs for each system and has been calculated at the supplier. The
tables underneath will give a general direction and can be different than the advice received
from your supplier. In case of doubt, contact your supplier for help.
Non drain back system
Pressure components
Pre-charge
Static height
expansion
1)
installation
vessel
3)
0 - 10 m 4,0 bar
10 - 15 m 4,5 bar
15 - 20 m 5,0 bar
1) The static height of the installation is measured from the highest point, which is always
the top of the solar collector, to the centre of the expansion vessel.
2) The factory set pre-charge value of the supplier supplied expansion vessel is 2,5 bar. If
more pressure is required, nitrogen must be used as filling gas. This procedure is
described in 4.2.4.
3) When using a MVI 204 pump, the static height is limited to 10 meters. This is because
of the pressure delivered by the pump to prevent the safety valve from opening. A
solution is to raise the complete pump station to a higher level to stay within the static
height as described in point 1).
Drain back system
Pressure components
Pre-charge
Static height
expansion
1)
installation
vessel
4)
0 - 10 m 4,0 bar
10 - 15 m 4,5 bar
15 - 20 m 5,0 bar
20 - 25 m 5,5 bar
1) The static height of the installation is measured from the highest point, which is always
the top of the solar collector, to the centre of the expansion vessel.
2) The factory set pre-charge value of the supplier supplied expansion vessel is 2,5 bar. If
more pressure is required, nitrogen must be used as filling gas. This procedure is
described in 4.2.4.
3) Drain back systems are operating at near-atmospheric pressure. The required dynamic
system pressure at the pump is given in appendix 9.3.
4) When using a MVI 204 pump, the static height is limited to 10 meters. This is because
of the pressure delivered by the pump to prevent the safety valve from opening. A
solution is to raise the complete pump station to a higher level to stay within the static
height as described in point 1).
Value safety
Filling pressure
valve
2)
6,0 bar
6,0 bar
6,0 bar
Value safety
Filling pressure
valve
2)
6,0 bar
6,0 bar
6,0 bar
6,0 bar
System pressure
Maximum
pressure
4,5 bar 5,5 bar
5,0 bar 5,5 bar
5,5 bar 5,5 bar
3)
System pressure
Maximum
pressure