Checking The Electrical Connections For Firm Seating; Checking All Gas Equipment For Leaks At Operating Pressure; Fitting The Front Panel; Checking The Combustion Quality - Viessmann VITODENS 100-W Installation And Service Instructions Manual

Checking the electrical connections for firm seating

Danger
Contact with live components can lead to seri-
ous injury from electric current. Some compo-
nents on PCBs remain live even after the power
supply has been switched off.
Never touch the wiring chambers (control unit
■
and power supply connections).
When working on the appliance, isolate the
■
system from the power supply, e.g. at a sepa-
rate MCB/fuse or a mains isolator. Check the
system is no longer live and safeguard against
reconnection.
Prior to working on the appliance, wait at
■
least 4 min until the voltage has completely
dropped out.

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 26.

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 71.
Permissible CO content
The CO content must be < 1000 ppm for all gas types.
Permissible CO or O
2 2
Operation with natural gas
Rated heating out- CO
put (kW)
Upper heating out-
put
32 7.3 - 10.5
content
content (%)
2
Lower heating out-
put
7.3 - 10.5
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 residues of the leak detection agent after test-
ing.
Note
To prevent operating faults and damage, operate the
appliance with uncontaminated combustion air.
2
O content (%)
2
Upper heating out-
put
2.1 - 8.4
Lower heating out-
put
2.1 - 8.4
39