Vitodens 222-F FS2B Installation instructions12.2 MB - Viessmann

Commissioning, inspection, maintenanceFurther details regarding the individual steps (cont.)Checking the pre-charge pressure and the DHW expansion vessel(if installed)1. Check the static pressure of the DHWline downstream of the pressurereducer and adjust if required. Setvalue: max. 3.0 bar2. Close the on-site shut-off valve in thecold water line.3. Turn lever on valve A to the "front"position.4. Check the pre-charge pressure of theDHW expansion vessel and adjust ifrequired. Set value: Static pressureminus 0.2 barA5. Turn lever on valve A back to the"l.h." position and open the on-siteshut-off valve in the cold water line.Checking all gas equipment for tightness at operating pressureDangerEscaping gas leads to a risk ofexplosion.Check gas equipment for tightness.NoteFor the tightness test, use only suitableand approved leak detecting agents (EN14291) and devices. Leak detectingagents with unsuitable constituents (e.g.nitrites, sulphides) can lead to materialdamage.Remove residues of the leak detectingagent after testing.Service5457 552 GBChecking the combustion qualityThe electronic combustion controller automatically ensures an optimum combustionquality. Only the combustion values need to be checked during commissioning andmaintenance. For this, check the CO 2 or O 2 content. For a description of the electroniccombustion controller functions, see page 144.45