Viessmann C3HA, Installation And Service Instructions For Contractors

Page: 79 / 192

79
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.
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.
Flue gas emissions test
The CO
2
or O
2
content must be within the following ranges:
CO
2
content O
2
content
Stirling burner min. 8.0 – 9.2 % 4.5 – 6.7 %
Engine & auxiliary burner max. 8.5 – 9.7 % 3.6 – 5.8 %
If the actual CO
2
or O
2
values lie outside
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
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).
Commissioning, inspection, maintenance
Further details regarding the individual steps
(cont.)
5618 294 GB
Service