Setting The Boiler Water Temperature; Setting The Minimum System Temperature; Restoring Factory Settings - Viessmann VITOLIGNO 250-S Operating Instructions Manual

Setting the boiler water temperature

In the delivered condition, the boiler water temperature
is set to 85 °C. The temperature of the boiler water is
controlled to the set value.
Press the following keys:
1. For the "Extended menu".
å
2. / For "Boiler".
| ~
Adjusting the set value for residual oxygen
Only change this setting after consulting a heating con-
tractor. You can also have the set value adjusted by
your heating contractor.
In the delivered condition, the minimum set value is
8 %.
Press the following keys:
1. For the "Extended menu".
å
2. / For "Boiler".
| ~

Setting the minimum system temperature

Select a value according to the minimum required tem-
perature for the heating system. If the temperature falls
below this value, the additional heat generator starts.
Press the following keys:
1. For the "Extended menu".
å
2. / For "Boiler".
| ~

Restoring factory settings

You can individually restore all modified values for
each heating circuit to their factory setting.
Press the following keys:
1. For the "Extended menu".
å
2. / For "Settings".
| ~
3. To confirm.
d
4. / For "Standard setting".
| ~
3. To confirm.
d
4. / For "Boiler water temp".
| ~
5. To confirm.
d
6. / For the required temperature.
| ~
7. To confirm.
d
3. To confirm.
d
4. / For "Flue gas residual O2".
| ~
5. To confirm.
d
6. / For the required value.
| ~
7. To confirm.
d
3. To confirm.
d
4. / For "Min set system temp".
| ~
5. To confirm.
d
6. / For the required temperature.
| ~
7. To confirm.
d
5. To confirm.
d
6. / For selecting the required parameter group.
| ~
The parameter groups available are "Gen-
eral", "Heating" or "DHW".
Select the required heating circuit under
"Heating" with
7. To confirm.
d
8. / For "Yes".
| ~
9. To confirm.
d
Further adjustments
/ and continue.
Ù Ú
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