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

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 gas equipment for tight-
ness.

Checking the combustion quality

The electronic combustion controller automatically ensures an optimum combustion
quality. Only the combustion values need to be checked during commissioning and
maintenance. For this, check the CO
combustion controller functions, see page 144.
Commissioning, inspection, maintenance
1. Check the static pressure of the DHW
line downstream of the pressure
reducer and adjust if required. Set
value: max. 3.0 bar
2. Close the on-site shut-off valve in the
cold water line.
3. Turn lever on 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
5. Turn lever on valve A back to the
"l.h." position and open the on-site
shut-off valve in the cold water line.
Note
For the tightness test, use only suitable
and approved leak detecting agents (EN
14291) and devices. Leak detecting
agents with unsuitable constituents (e.g.
nitrites, sulphides) can lead to material
damage.
Remove residues of the leak detecting
agent after testing.
or O content. For a description of the electronic
2 2
(cont.)
45