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7.1.2 Checking the volume of the expansion vessel
As the pre-charge pressure increases, the maximum volume of the system supported by the expansion vessel supplied as
standard, decreases.
where
- VI: volume of the system supported by the expansion vessel [l]
- VVE: volume of the expansion vessel [l]
- Ce: expansion coefficient of water
- pVE: pre-charge pressure of the expansion vessel [barg]
- pVS: calibration pressure of the safety valve [barg]
If the actual volume of the system is higher than this maximum value, an additional expansion vessel of adequate volume
must be installed.
After filling the hydraulic circuit, the pressure at the expansion vessel must be just a little higher than the pre-charge pres-
sure.
If there are points of use placed at levels lower than the level at which the unit is installed, check that the point of use is able
to withstand the maximum pressure that can be generated.
The volume of the expansion vessel must be checked for each hydraulic circuit
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Translation from original instructions
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