64
22.04 – 4139181_04
The table gives an example of the maximum water content calculated at the indicated operating conditions and only to protect the unit.
If the volume of water in the system is higher, add another expansion vessel of the correct size.
System water temperature max/min
°C
40/4
Hydraulic height
M
30
25
20
15
≤12,25
Expansion vessel pre-load
bar
3,2
2,8
2,3
1,8
1,5
Water content maximum
l
2174
2646
3118
3590
3852
System water temperature max/min
°C
60/4
Expansion vessel pre-load
bar
3,2
2,8
2,3
1,8
1,5
Water content maximum
l
978
1190
1404
1616
1732
The data in the table refer to units with a 24 l expansion vessel.
EXPANSION VESSEL SETTING
The expansion tank volume is 24l. The standard value of the expansion tank pre-charge pressure is 1.5 bar, but this can be calibrated up to a maximum of 6 bar.
The expansion tank pressure setting has to be adjusted based on the difference in height (H) of the installation (see figure) according to the formula: p (rating) [bar] = H [m]
/ 10.2 + 0.3.
For example, if the difference in height H is 20 m then the value of the expansion tank pressure setting is 2.3 bar.
If the calculated pressure setting value is less than 1.5 bar (when H < 12.25), maintain the standard pressure setting.
Key
A
Expansion vessel
1
Check that highest utility is
not higher than 55 metres
2
Ensure that lowest utility can
withstand global pressure in
that position
H max (1) = 55 m
H = 0 m
H = 12.25 m
Ptar = H / 10.2 + 0.3
Ptar = 1.5 bar
Ptar = 1.5 bar
H min (2)
A
