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

Commissioning, inspection, maintenance
Further details regarding the individual steps

Checking the diaphragm expansion vessel and system pressure

44
(cont.)
Note
Carry out this test on a cold system.
1. Drain the system, until the pressure
gauge indicates "0".
2. If the diaphragm expansion vessel
inlet pressure is lower than the static
system pressure: Top up with nitro-
gen via connection A, until the inlet
pressure is 0.1 to 0.2 bar.
3. Top up your heating system with
water and vent until the filling pres-
sure of a cooled system is 0.1 to 0.2
bar higher than the inlet pressure of
the diaphragm expansion vessel.
Permiss. operating pressure: 3 bar