1.
Connect the ends of the filling hose
without valves with the connections
of the pressure gauge set
C
.
2.
Remove protective cap from ser-
vice valve
N
of three-way diverter
valve
O
and connect filling hose
D
.
3.
Connect the centre hose
B
of
pressure gauge set
C
with
vacuum pump
A
.
4.
Start vacuum pump
A
.
Let the pump run for 15 min.
5.
Close the valve between pressure
gauge set
C
and vacuum pump.
Stop vacuum pump
A
and wait 5
min.
Should the indicated value change
within this period, that would indi-
cate a leak.
Remove the leak and repeat the
process.
6.
Run vacuum pump
A
until a
vacuum has been built (the value
indicated by the pressure gauge
must be near to 0 bar).
Note
The pump runtime will be subject to
the ambient conditions.
7.
Remove filling hose
D
from ser-
vice valve
N
, then first fit and sub-
sequently tighten the protective
cap with 11 to 13 Nm.
Evacuating type OT307H
Note
Prior to evacuating the system, carry out a leak test (pressure test with dried
nitrogen).
Further details regarding the individual steps
(cont.)
9
Commissioning, inspection, maintenance
5692
689
GB