Checking The Pre-Charge Pressure And The Dhw; Expansion Vessel (If Installed); Checking All Gas Equipment For Tightness At Operating; Pressure - Viessmann Vitodens 222-F B2TA Installation And Service Instructions Manual

Commissioning, inspection, maintenance
Further details regarding the individual steps
Checking the pre-charge pressure and the DHW expansion ves-
sel (if installed)
A
Checking all gas equipment for tightness at operating pressure
Danger
Escaping gas leads to a risk of
explosion.
Check all gas equipment for tight-
ness.
62
(cont.)
1. Check the static pressure of the DHW
line downstream of the pressure
reducer and adjust if required. Set
value: max. 3.0 bar (0.3 MPa).
2. Close the on-site shut-off valve in the
cold water line.
3. Turn operating lever of valve A to
the "front" position.
4. Check the pre-charge pressure of the
DHW expansion vessel and adjust if
required. Set value: Static pressure
minus 0.2 bar (0.02 MPa).
5. Turn operating lever of valve A back
to the "left" position and open the on-
site shut-off valve in the cold water
line.
Note
Only use suitable and approved leak
detection agents (EN 14291) and devi-
ces for the tightness test. Leak detection
agents with unsuitable constituents
(e.g. nitrites, sulphides) can cause mate-
rial damage.
Remove residues of the leak detection
agent after testing.