Building Up The System Pressure - Viessmann VITOCAL 151-A Installation And Service Instructions Manual

Building up the system pressure

Fig. 59
Filling the system with the filling function is completed.
The "Build up system pressure" function then starts
automatically.
1. Connect the fill hose to the 3-way ball valve in the
outdoor unit flow (indoor unit heating water inlet).
2. Open the 3-way ball valve in the outdoor unit flow
(indoor unit heating water inlet) as shown in
Fig. 77: Open in all directions
3. Open the flow between the indoor and outdoor
units via the 3-way ball valve in the outdoor unit
return: See Fig. 77.
4. Allow the heating water to flow in slowly via the fill
hose.
Check the system pressure on the display.
Commissioning, inspection, maintenance
5. As soon as the required system pressure has been
reached, end the process in the commissioning
assistant.
6. Close the 3-way ball valve in the outdoor unit flow
(indoor unit heating water inlet). The flow from the
outdoor unit remains open.
Remove the fill hose.
7. Check the internal and on-site hydraulic connec-
tions for leaks.
!
Please note
Leaking hydraulic connections lead to appli-
ance damage.
Check the internal and on-site hydraulic
■
connections for leaks.
In the event of leaks, switch off the appli-
■
ance immediately. Drain the heating water.
Check the seating of seal rings. Always
replace displaced seal rings.
77