Viessmann VITOCAL 222-S Installation And Service Instructions Manual page 74

Commissioning, inspection, maintenance
Further details regarding the individual steps
G Fill hose between pressure gauge
set and external unit
H Pressure gauge set
K Connection hose between pressure
gauge set and vacuum pump
!
Please note
Never subject the vacuum
gauge
to positive pressure.
1. Close all valves at the pressure
gauge set.
2. Make all connections, as shown
above.
!
Please note
Filler valve D must remain
closed.
Finally, connect the end of
the filling hose to the service
valve E.
For all connections, counter-
hold with a second open-
ended spanner.
3. Start the vacuum pump.
At the pressure gauge set, open the
valve to the vacuum pump and the
valve to the hot gas connection.
74
L Vacuum pump
M Connection hose between pressure
gauge set and vacuum gauge
N Valve for vacuum gauge
O Vacuum gauge
4. After approx. 5 min, open the valve to
the vacuum gauge.
Leave the vacuum pump running until
almost 0 bar is indicated on the vac-
uum gauge (at least 30 min).
Note
The vacuum pump runtime will
depend on the ambient conditions.
5. Close the valve on the pressure
gauge set to the vacuum pump.
Stop the vacuum pump and wait
approx. 5 min. There is a leak if the
indication on the vacuum gauge
rises.
Remove the leak and repeat the proc-
ess.
6. Close all valves at the pressure
gauge set.
7. Remove the vacuum pump and vac-
uum gauge.
(cont.)