Checking The Diaphragm Expansion Vessel And System Pressure - Viessmann VITODENS 222-F Installation And Service Instructions Manual

Commissioning, inspection, maintenance

Checking the diaphragm expansion vessel and system pressure

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
pressure is 0.1 to 0.2 bar (10 to 20 kPa) higher
than the static system pressure.
50
A
until the pre-charge
A
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)