45
Checking the pre-charge pressure and the DHW expansion ves-
sel (if installed)
A
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.
Checking all gas equipment for tightness at operating pressure
Danger
Escaping gas leads to a risk of
explosion.
Check gas equipment for tight-
ness.
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.
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
2
or O
2
content. For a description of the electronic
combustion controller functions, see page 144.
Commissioning, inspection, maintenance
Further details regarding the individual steps
(cont.)
5457 552 GB
Service
Summary of Contents for FS2B
Page 163: ...163 5457 552 GB ...
