Checking The Gas Type; Removing The Front Panel - Viessmann Vitodens 050-W Installation And Service Instructions Manual

Venting the heating system
Activating the venting function
If the venting function is to be activated after commis-
sioning.
Tap the following buttons:
1. and OK simultaneously for approx. 4 s, then
release.
2. Use / to select "b.5" for the commissioning
assistant.
3. OK
4. The display shows "AP".
Press for 4 s.

Checking the gas type

The boiler is equipped with an electronic combustion
controller that adjusts the burner for optimum combus-
tion in accordance with the prevailing gas quality.
Operation with natural gas therefore requires no
■
adjustment across the entire Wobbe index range.
The boiler can be operated within the Wobbe index
range 9.5 to 15.2 kWh/m
■ For operation with LPG, the gas type needs to be
changed on the control unit (see following chapter).
1. Determine the gas type and Wobbe index by ask-
ing your local gas supply utility or LPG supplier.
2. Record the gas type in the report.

Removing the front panel

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.
■ Do not touch the wiring chambers (control
unit and mains 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.
(cont.)
3 3
(34.2 to 54.7 MJ/m ).
Commissioning, inspection, maintenance
5. Use / to select "C.2" for venting.
6. OK
7. / should be used to select "ON" to switch on
venting.
8. OK
The venting function is activated. The display
shows a rotating rectangle.
The venting function ends automatically after
20 min, or press for 4 s.
Changing the gas type for operation with LPG (not
for appliances with multiple connection)
1. To change the gas type on the control unit, see
"Commissioning the system with the commission-
ing assistant"
2. Affix label "G31" (supplied with the technical docu-
mentation) next to the type plate on the cover
panel.
Note
No mechanical adjustments are made to the gas sole-
noid valve.
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