63
■
Moving the control unit panel into the service posi-
tion:
See page 80.
■
Opening the programming unit:
See page 79.
AUTO
MAN
E
D
B
C
A
Fig. 58
1.
Open any non-return valves installed on site.
2.
Check the pre-charge pressure of the expansion
vessel. Adjust the pre-charge pressure to match
the system conditions if necessary.
3.
Fill (flush) and vent the secondary circuit using
drain & fill valve
A
or an on-site connection.
!
Please note
Leaking hydraulic connections lead to appli-
ance damage.
■
Check the internal and on-site hydraulic
connections for leaks.
■
In the event of leaks, switch off the appli-
ance immediately. Drain off liquid via the
drain valve. Check the seating of seal
rings.
Always
replace displaced seal
rings.
4.
Move the control unit panel into the service posi-
tion.
5.
Open the programming unit.
6.
Open the air discharge valve in quick-action air
vent valve
C
.
7.
Check the system pressure at the pressure gauge.
Top up with water if required.
■
Minimum system pressure:
0.8 bar (80 kPa)
■
Permissible operating pressure:
3.0 bar (0.3 MPa)
8.
Move 3-way diverter valve
B
to its central posi-
tion: Press
E
. Turn anti-clockwise to lock into the
"MAN" position. Move lever
D
to a vertical posi-
tion.
9.
Set the 3-way diverter valve to the "AUTO" posi-
tion: Turn
E
clockwise.
Checking the expansion vessel and heating circuit pressure
Observe engineering information.
Heat pump technical guide
Checking the indoor unit electrical connections for firm seating
Commissioning, inspection, maintenance
Filling and venting the secondary side
(cont.)
6150148
