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).
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