50
A
Fig. 43
Note
Carry out this test on a cold system.
1.
Drain the system until the pressure gauge shows
"0".
2.
If the expansion vessel pre-charge pressure is
lower than the static system pressure: top up with
nitrogen at connection
A
until the pre-charge
pressure is 0.1 to 0.2 bar (10 to 20 kPa) higher
than the static system pressure.
3.
Top up with water until the charge pressure of the
cooled system is 0.1 to 0.2 bar (10 to 20 kPa)
higher than the pre-charge pressure of the expan-
sion vessel.
Permiss. operating pressure: 3 bar (0.3 MPa)
Commissioning, inspection, maintenance
Checking the diaphragm expansion vessel and system pressure
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