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Viessmann Vitocal 252-A Series - Page 102

Viessmann Vitocal 252-A Series
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102
Procedure Explanations and references
Venting The system is vented via the quick-action air vent valve in the outdoor unit: See
chapter "Venting the system" on page 111.
Note
If the outdoor unit is not yet connected, connect both the flow and return connec-
tions of the outdoor unit to the indoor unit on site. Fit an air vent valve into this
hydraulic connection and use it to vent the system: See page 58.
Note
The venting process can take up to 20 min.
Extensions
Power-OFF and Smart
Grid
Activation of power-OFF or Smart Grid:
Connection of power supply utility floating contacts (connections 143.4 and
143.5 on the bottom PCB): See page 71.
Not available Neither power-OFF nor Smart Grid is connected.
Power-OFF Floating contact for power-OFF is connected (connection 143.4 on the bottom
PCB): See page 71.
Smart Grid Floating contacts for Smart Grid are connected (connections 143.4 and 143.5 on
the bottom PCB): See page 71.
Commissioning, inspection, maintenance
Commissioning the system (cont.)
6222080

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