63
AUTO
MAN
A
B
C
D
Fig. 59
0
1.
Open any non-return valves installed on site.
0
2.
Check the pre-charge pressure of the expansion
vessel. Recharge if required.
0
3.
Fill (flush) and vent the secondary circuit via an
on-site connection.
0
4.
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)
0
5.
Place the control panel in its service position: See
page 78.
0
6.
Open the programming unit: See page 77.
0
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
.
0
8.
Move 3-way diverter valve
A
to its centre posi-
tion: press
D
and turn anti-clockwise to lock in
the "MAN" position. Move lever
C
to a vertical
position.
0
9.
Close secondary circuit air vent valve
B
.
10.
Turn the 3-way diverter valve clockwise to the
"AUTO" position.
Checking the expansion vessel and heating circuit pressure
Observe engineering information.
Heat pump technical guide
Checking the indoor unit electrical connections for firm seating
Checking that the fan in the outdoor unit can run freely
Danger
Contact with the fans while they are operating
can result in serious cutting injuries.
■
Isolate the outdoor unit from the power supply
and safeguard against reconnection.
■
Do not open the appliance until the fan has
come to a stop.
Commissioning, inspection, maintenance
Filling and venting the secondary side
(cont.)
5790 931 GB
