Checking For Tightness The Gas-Bearing Parts Of The Gas Condensing Module And Connections To The Fuel Cell Module Under Operating Pressure; Checking The Combustion Quality - Viessmann Vitovalor 300-P Installation And Service Instructions For Contractors

Checking for tightness the gas-bearing parts of the gas condensing module
and connections to the fuel cell module under operating pressure
Danger
Escaping gas leads to a risk of explosion.
Check all gas equipment for tightness.

Checking the combustion quality

Gas condensing module
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 or O content. For a description of the elec-
2 2
tronic combustion controller functions, see page 176.
Note
To prevent operating faults and damage, operate the
appliance with uncontaminated combustion air.
CO content
The CO content must be < 1000 ppm for all gas
■
types.
CO or O content
2 2
The CO content must be within the following limits
■
2
for upper and lower heating output respectively:
– 7.5 to 9.5 % in the case of natural gas E
■ The O content must be between 4.0 and 7.6 % for
2
all gas types.
A
Fig. 81
1. Connect a flue gas analyser at flue gas port
the boiler flue connection.
2. Open the gas shut-off valve, start the boiler and
create a heat demand.
Commissioning, inspection, maintenance
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 leak detection agent residues after testing.
If the actual CO
tive ranges, proceed as follows:
■ check the balanced flue system for tightness, see
page 75.
check the ionisation electrode, see page 78.
■
check the connecting cable on the ionisation elec-
■
trode.
Note
During commissioning, the combustion controller car-
ries out an automatic calibration. Start emissions cap-
ture no sooner than about 30 s after the burner has
started.
B
on 3. Set the lower heating output (see page 88).
A
4. Check the CO
deviate from the aforementioned ranges by more
than 1 %, implement steps detailed on page 87.
or O values lie outside their respec-
2 2
content. Should the actual value
2
87