54
!
Please note
Escaping liquids can lead to electrical defects.
Protect electrical components of the heat pump
from escaping liquids.
1.
Open any non-return valves installed on site.
2.
Check the pre-charge pressure of the expansion
vessel.
Technical guide
Fig. 49
3.
Fill (flush) and vent the secondary circuit:
■
Slightly open quick-action air vent valve, remains
open: See safety assembly, chapter "Connecting
the secondary circuit".
■
Open air vent valve DHW heating, remains open:
See the following chapter.
■
For venting, use lever to move the 3-way diverter
valve "Central heating/DHW heating" to its centre
position and click into place: See Fig. 49.
4.
!
Please note
Leaking hydraulic connections lead to appli-
ance damage.
■
Check tightness of the internal and on-site
hydraulic connections.
■
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.
5.
Check the system pressure. Top up with water if
required.
■
Minimum system pressure:
0.8 bar (80 kPa)
■
Permissible operating pressure:
3 bar (0.3 MPa)
Commissioning, inspection, maintenance
Filling and venting the secondary side
(cont.)
5776 028 GB
Summary of Contents for AWT 221.A04
Page 77: ...77 Maintenance Checking the fuses cont 5776 028 GB Maintenance...
Page 87: ...87 Indoor unit parts lists Indoor unit hydraulics cont 5776 028 GB Components...
Page 90: ...90 Indoor unit parts lists Indoor unit cylinder cont 5776 028 GB Components...
Page 137: ...137 Wind direction 11 Wind loads 11 Keyword index Keyword index cont 5776 028 GB...
Page 138: ...138 5776 028 GB...
Page 139: ...139 5776 028 GB...
