48
3.
Fill (flush) and vent the secondary circuit via an on-
site connection.
F
E
D
C
Fig. 45
Safety assembly supplied
C
Pressure gauge
D
Connection G
¾
E
Quick-action air vent valve
F
Safety valve
4.
Check the system pressure at pressure gauge
C
.
Top up with water if required.
Minimum system pressure:
0.8 bar (80 kPa)
Permiss. operating pressure:
3.0 bar (0.3 MPa)
5.
Move the control unit panel into the service posi-
tion: See page 61.
6.
Open the programming unit: See page 60.
A
B
Fig. 46
7.
To prevent damage to electrical components, con-
nect an on-site hose to secondary circuit air vent
valve
B
.
Open secondary circuit air vent valve
B
.
8.
Move 3-way diverter valve
A
by its handle into its
centre position.
9.
Close secondary circuit air vent valve
B
.
Checking expansion vessel and heating circuit pressure
Observe engineering information.
Heat pump technical guide
Commissioning, inspection, maintenance
Filling and venting the secondary side
(cont.)
5700 542 GB
