Viessmann Vitocal 222-S Installation And Service Instructions For Contractors page 62

Commissioning, inspection, maintenance
Evacuating the refrigerant lines and indoor unit
Connection hose between pressure gauge set and
N
vacuum gauge
!
Please note
Overpressure will damage the vacuum gauge.
Never subject the vacuum gauge to positive
pressure.
1. Close all valves at the pressure gauge set.
2. Make all connections as shown above.
Note
■ Shut-off valve must remain closed.
E
■ For all connections, counterhold 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 connec-
tion.
4. After approx. 5 min, open the valve to the vacuum
gauge.
Leave the vacuum pump running until the indica-
tion on the vacuum gauge is almost at "0" (at least
30 min).
Note
The vacuum pump runtime will depend on the
ambient conditions.
Evacuating the indoor unit with the service function (pump down)
1. Service menu:
Press OK + simultaneously and hold for
å
approx. 4 s.
2. "Service functions"
3. "Evacuate refrigerant line"
4. Start the process with "Yes".
■ "Initialisation" is shown.
The secondary pump starts.
■
The compressor starts within 4 min. Refrigerant
■
circuit reversal is active.
Note
If the compressor does not start within 4 min, ter-
minate the function with
62
P
Q
5. On the pressure gauge set, close the valve to the
6. Close all valves at the pressure gauge set.
7. Remove the vacuum pump and vacuum gauge.
5. Once the compressor is running, close the liquid
6. As soon as "Terminates shortly" is shown, close
and restart.
(cont.)
Valve for vacuum gauge
Vacuum gauge
vacuum pump.
Stop the vacuum pump and wait approx. 5 min. If
the indication on the vacuum gauge rises, there is
a leak.
Eliminate the leak and repeat the process.
line shut-off valve on the outdoor unit.
■ The suction gas pressure falls.
"Is active" is shown.
■
Once the suction gas pressure has fallen below
■
the minimum value, "Terminates shortly" is
shown.
the hot gas line shut-off valve on the outdoor unit.
Once the suction gas pressure has fallen yet fur-
ther, the compressor stops.