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5. Commissioning
Before commissioning, the gas pre-charge pressure in the vessel must be checked and where necessary adjusted to the
system. The check on the gas pre-charge pressure is done with the vessel isolated from the system, and all water drained
from the vessel (see the "Maintenance" section). The gas charge can then be checked using a standard tyre pressure
tester. If the pressure is too high, it can be released at the pre-charge pressure valve, and if too low, topped up with dry
compressed air or nitrogen.
The gas pre-charge pressure is 0.3 bar below the set pressure of the pressure
reducer (corresponds on the attached sticker to the system filling pressure) in the
fresh water supply. After adjusting the gas pre-charge pressure, the shut-off valves
to the maintenance units should be opened, and the EVSan_D expansion vessel
is then operational.
After commissioning, the sticker provided (see example on the right) should be
completed and stuck to the vessel in a highly visible place. The indication of the
system filling pressure corresponds to the set pressure of the pressure reducer.
6. Maintenance and periodic testing
Expansion vessels with constant pre-charge pressure must be checked regularly to ensure the proper functioning of the
vessel and system over the long term (annually is recommended as a minimum). During the check, the vessel must be
disconnected from the system (maintenance unit), the water drained from the vessel and the pre-charge pressure then
checked and corrected where necessary. The Pressure Systems Safety Regulations (PSSR 2000) must be followed.
During this check, or at the latest in the event of a loss of pre-charge pressure, the flange nuts should be checked for
tightness and retightened where necessary (torque 20 Nm). Periodic checks on the expansion vessel must be carried out
in accordance with the local legal requirements!
It must thus be possible to disconnect the vessel from the system and to drain it via a fitting.
The maintenance unit is a connection accessory for expansion vessels for incorporation into the system in accordance with
the regulations and with all the functions necessary for maintenance.
1 Shut off connection hoses from and to the cold-water supply – shut-off valves on the side (1) with hexagonal socket to
prevent unintentional closing.
2 Drain the vessel on the water side - Outlet can be rotated (2) 360°, made with standard hose connection G¾".
3 Check the pre-charge pressure on the pre-charge pressure valve with tyre pressure tester.
4 Adjust or correct the pre-charge pressure where necessary (see Commissioning).
5 Check that the pre-charge pressure valve is sealed tight.
6 Any further required checks and certification according to PSSR 2000 must be carried out.
7 Reopen connection hoses from and to the cold-water supply.
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