Viessmann B2HF, Инструкции по установке и обслуживанию для подрядчиков

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3. Top up with water until the charge pressure of the
cooled system is at least 1.0 bar (0.1 MPa), and is
0.1 to 0.2 bar (10 to 20 kPa) higher than the pre-
charge pressure of the expansion vessel.
Permiss. operating pressure: 3 bar (0.3 MPa)
Note
The expansion vessel is supplied from the factory
with a pre-charge pressure of 0.7 bar.
Do not allow the pre-charge pressure to fall below
this value (boiling noises). This also applies to sin-
gle floor heating systems or attic heating centres
(no static pressure).
Top up with water until the charge pressure is 0.1
to 0.2 bar above the pre-charge pressure.
Checking the safety valve function
Checking the electrical connections for firm seating
Checking all 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 leaks.
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.
Fitting the front panel
See page 34.
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. To do this, test the CO content and CO
2
or O
2
content, and record these in the report on
page 124.
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 expansion vessel and system…
(cont.)
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