Checking All Gas Equipment For Tightness At Operating Pressure; Flue Gas Emissions Test - Viessmann Vitotwin 300-W Installation And Service Instructions For Contractors

Further details regarding the individual steps

Checking all gas equipment for tightness at operating pressure

Danger
Escaping gas leads to a risk of
explosion.
Check all gas equipment for tight-
ness.

Flue gas emissions test

The CO or O content must be within the following ranges:
2 2
Stirling burner min.
Engine & auxiliary burner max.
If the actual CO or O
2
the respective range:
1. check the tightness of the balanced
flue system (see page 69).
2. check the static pressure and the sup-
ply pressure (see page 68).
Performing the test
A
values lie outside
2
Commissioning, inspection, maintenance
(cont.)
Note
For the tightness test, use only suitable
and approved leak detecting agents
(EN 14291) and devices. Leak detection
agents with unsuitable constituents (e.g.
nitrites, sulphides) can cause material
damage.
Remove residues of the leak detection
agent after testing.
CO content
2
8.0 – 9.2 %
8.5 – 9.7 %
1. Connect a flue gas analyser at test
port A (on the boiler flue connec-
tion).
2. Open the gas shut-off valve, start the
boiler and create a heat demand.
3. Adjust "Eng burner min" (see
page 80).
O content
2
4.5 – 6.7 %
3.6 – 5.8 %
79