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Water connections
6.6 Water volume, system pressure and expansion tank control
Check that the system has the minimum water content.
The total volume of water, excluding that contained in the unit, must exceed the values in the table:
Size 2.1 to 3.1 4.1 to 8.1 9.1 to 14.1
MIN water volume 30l 70l 100l
In most applications, this volume of water will be sucient; however, in process applications or in environments
with high thermal load, additional water may be required.
L
NOTE
When the system has zones with remotely controlled valves, the minimum volume of water must be
guaranteed even when all valves are closed.
6.6.1 System pressure and expansion tank control
The units are equipped with an 8-litre expansion tank (with an available volume of 4.8 litres) which has a pre-
charge pressure of 1 bar, sized to suit the total water content of the most common systems.
When serving systems with a high water content, the expansion tank volume may not be sucient and the
pre-charge pressure must be adjusted or an additional expansion tank must be provided.
6.6.2 Sizes 2.1 to 8.1
It is not necessary to adjust the pressure of the standard supplied expansion tank as the water content of the
system changes, but it may be necessary to add an additional expansion tank.
Based on the water content of the system, calculate the total volume required for the expansion tank VEXP.
VESSEL:
Fig. 36
The volume of the additional expansion tank must be: VADDITIONAL = VEXP. VESSEL - 4.8 [l]
L
NOTE
The additional expansion tank must be set to 1 bar.
V. V Expansion tank volume [l]
V. V Water content of the system [I]
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