51
C
B
A
Fig. 44
1.
Check the static pressure of the DHW line down-
stream 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.
Relieve the water pressure.
3.
Turn lever on valve to position
B
.
4.
Check the pre-charge pressure of the DHW expan-
sion vessel and adjust if required. Set value: Static
pressure minus 0.2 bar (20 kPa).
5.
Turn lever on valve back to position
A
. Open the
on-site shut-off valve in the cold water line.
Checking the safety valve function
Checking the electrical connections for firm seating
Checking gas equipment for leaks at operating pressure
Danger
Escaping gas leads to a risk of explosion.
Check gas equipment (including inside the appli-
ance) for gas tightness.
Note
Only use suitable and approved leak detection agents
(EN 14291) and devices for the tightness test. Leak
detection agents with unsuitable constituents (e.g.
nitrides, sulphides) can cause material damage.
Remove residues of the leak detection agent after test-
ing.
Checking the combustion quality
The electronic combustion controller automatically
ensures optimum combustion quality. During commis-
sioning/maintenance, only the combustion values need
to be checked. For this, measure the CO content and
the CO
2
or O
2
content.
Note
To prevent operating faults and damage, operate the
appliance with uncontaminated combustion air.
Permissible CO content
The CO content must be < 1000 ppm for all gas types.
Commissioning, inspection, maintenance
Checking the pre-charge pressure and the DHW expansion vessel (if instal-
led)
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