Checking The Safety Valve Function; Checking The Electrical Connections For Firm Seating; Checking All Gas Equipment For Leaks At Operating Pressure; Fitting The Front Panel - Viessmann VITODENS 200-W Installation And Service Instructions For Contractors

Commissioning, inspection, maintenance
Checking the expansion vessel and system...
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.

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
or O content, and record these in the report on
2
page 124.
Permissible CO content
The CO content must be < 1000 ppm for all gas types.
60
(cont.)
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.
Note
To prevent operating faults and damage, operate the
appliance with uncontaminated combustion air.
2