Checking All Gas Equipment For Tightness At Operating Pressure; Checking The Combustion Quality - Viessmann Vitodens 222-F Installation And Service Instructions For Contractors

Commissioning, inspection, maintenance

Checking all gas equipment for tightness at operating pressure

Danger
Escaping gas leads to a risk of explosion.
Check all gas equipment for tightness.

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. 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 142.
Note
Operate the appliance with uncontaminated combus-
tion air to prevent operating faults and damage.
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 the lower and upper heating output respectively:
– 7.5 to 9.5 % for natural gas E and LL
– 8.8 to 11.1 % for LPG P
■ The O content must be between 4.0 and 7.6 % for
2
all gas types.
If the actual CO or O values lie outside their respec-
2 2
tive ranges, proceed as follows:
■ Check the balanced flue system for tightness; see
page 40.
Check the ionisation electrode and connecting cable;
■
see page 43.
Note
During commissioning, the combustion controller car-
ries out an automatic calibration. Allow approx. 30 s
after the burner has started before testing the emis-
sions.
Selecting higher/lower heating output
Note
Ensure adequate heat transfer.
Tap the following buttons:
1. "Menu"
50
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.
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Fig. 41
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.
3. Select the lower heating output (see page 50).
4. Check the CO content. Should the actual value
2
deviate from the aforementioned ranges by more
than 1 %, implement steps detailed on page 50.
5. Enter the actual value into the report.
6. Select the upper heating output (see page 50).
7. Check the CO content. Should the actual value
2
deviate from the aforementioned ranges by more
than 1 %, implement steps detailed on page 50.
8. After testing, press OK.
9. Enter the actual value into the report.
2. "Service"
3. Enter "viservice" password.
4. "Actuator test"
on
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