44
A
Fig. 38
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.
3.
Turn operating lever of valve
A
to the "front" posi-
tion.
4.
Check the pre-charge pressure of the DHW expan-
sion 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.
Checking the function of the safety valves
Checking the firm seating of electrical connections
Checking all gas equipment for tightness at operating pressure
Danger
Escaping gas leads to a risk of explosion.
Check all gas equipment for 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.
nitrites, 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. For a description of the elec-
tronic combustion controller functions, see page 133.
Note
Operate the appliance with uncontaminated combus-
tion air to prevent operating faults and damage.
CO content
■
The CO content must be < 1000 ppm for all gas
types.
CO
2
or O
2
content
■
The CO
2
content must be within the following limits
for upper and lower heating output respectively:
–
7.5 to 9.5 % for natural gas E and LL
–
8.8 to 11.1 % for LPG P
■
The O
2
content must be between 4.0 and 7.6 % for
all gas types.
Commissioning, inspection, maintenance
Checking the pre-charge pressure and the DHW expansion vessel (if instal-
led)
5773 216 GB
Summary of Contents for B2TA
Page 101: ...101 Parts lists Overview of assemblies 5773 216 GB Components ...
Page 107: ...107 Parts lists Hydraulics 5773 216 GB Components ...
Page 118: ...118 0004 0002 0005 0006 0001 0003 Fig 77 Parts lists Miscellaneous 5773 216 GB Components ...
Page 142: ...142 5773 216 GB ...
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