3.
Top up the heating system with
water and vent, until the filling pres-
sure of a cool system is higher (0.1
to 0.2 bar) than the inlet pressure
of the diaphragm expansion ves-
sel.
12. Checking the function of the thermally activated safety valve
Only for the Vitolig 300 with 21.0 and
25.9 kW.
1.
Activate the valve of the thermally
activated safety valve: Push red
cap
A
against the valve.
Water must flow from the valve.
2.
In case of a low throughput, check
the heat exchanger for scaling and
sludge deposits.
Clean, if required.
13. Checking the mixer for obstructions and leaks
1.
Check the mixer for ease of opera-
tion.
2.
Check the mixer for leaks.
Replace the O-rings in case of
leaks.
11. Checking the diaphragm expansion vessel and . . .
(cont.)
20
Inspection and maintenance
5692
618
GB
Содержание Vitolig 300
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