External Heat Source For Dhw - Viessmann VITOCAL 300-A Installation And Service Instructions Manual

Control settings, external heat source
Dual-mode temperature
5. 1/! for the selected value.
6. "BACK" to confirm.

External heat source for DHW

If an external heat source is to be
used for DHW heating.
If the heat demand made of the DHW
cylinder that cannot be covered by the
heat pump, the circulation pump for
cylinder reheating and the external
heat source will be activated.
If the setting "Yes" is entered, no
electric immersion heater (on site) in
the DHW cylinder can be controlled.
Press the following keys:
1. "Device settings".
146
(cont.)
Delivered condition:
Setting range:
2. "Programming".
3. "Ext. heat source".
4. y/x for "Ext. HS for DHW"
5. "NO"
6. "YES"
7. "BACK"
10 °C
-50 to 50 °C
(7B0D).
(Delivered condition)
or
to confirm.