Viessmann Vitovalor PT2 Installation And Service Instructions For Contractors page 64

Commissioning, inspection, maintenance
Filling gas condensing module and heating...
D
C
D
Fig. 61
01. Check the pre-charge pressure of the external dia-
phragm expansion vessel. See page 85.
02. Close the shut-off valves
ing water side.
03. Check that gas shut-off valve
04. Check that air vent valves
05. Connect the fill hose on filling connection
shut-off valve .
A
06. Connect the short drain hose supplied on air vent
valve to shut-off valve
F
hose to the on-site drain.
07. Open valves and
E
and .
B
08. Fill with water until no more air is escaping from
vent hole .
F
64
and on the heat-
A B
C is closed.
are open.
D
to
E
. Connect the drain
B
on shut-off valve
F A
(cont.)
09. When fill water runs out without bubbles, fully
open shut-off valve
A
10. Switch on ON/OFF switch and activate commis-
sioning assistant. See the following chapter.
11. Vent heating circuits by bleeding the radiators.
12. Adjust filling pressure by slowly closing valves
and . Check filling pressure on the display in
F
"System overview" or on the on-site pressure
gauge.
■ Min. operating pressure 1.0 bar (0.1 MPa).
■ Permissible operating pressure 3.0 bar
(0.3 MPa).
13. Remove fill hose and drain hose.
14. Ventilate heating system once more if required.
See page 84.
C
D
D
and then .
B
E