70
3.
Fill (flush) and vent the secondary cir-
cuit:
■ Slightly open the quick-action air
vent valve (see safety assembly,
chapter "Connecting the secon-
dary circuit"); it remains open.
■ Open DHW heating air vent valve
(see following chapter); it remains
open.
■ For venting, use the lever to move
the 3-way diverter valve for "Heat-
ing/DHW heating" to its centre
position and click into place (see
diagram).
4.
!
Please note
To prevent appliance dam-
age, check the secondary cir-
cuit flow and return connec-
tions to the heat pump for
tightness
.
In case of leaks, switch off the
appliance immediately, drain
the water and check the seat-
ing of the seal rings. Always
replace displaced seal wash-
ers.
5.
Check the system pressure and top
up with water if required.
Minimum system pressure: 0.8 bar
(80 kPa)
Permiss. operating pressure: 3 bar
(0.3 MPa)
Commissioning, inspection, maintenance
Further details regarding the individual steps
(cont.)
5782 201 GB
