Viessmann Vitoclima 300-S Service Instructions For Contractors page 9

Further details regarding the individual steps
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.
Evacuating type OT307H
Note
Prior to evacuating the system, carry out a leak test (pressure test with dried
nitrogen).
Commissioning, inspection, maintenance
(cont.)
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.
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