Viessmann VITOCAL 222-S Installation And Service Instructions Manual page 34

Installation sequence
Connecting the secondary circuit
E F
D
Safety assembly supplied
C Pressure gauge
D Connection G¾
E Quick-action air vent valve
F Safety valve
1. Connect the secondary lines to the
heat pump:
!
Please note
Ensure hydraulic connections
are tight.
Ensure the diaphragm grom-
mets of the pipe outlets are
seated correctly (if necessary,
seal with sealing tape). (See
chapter "Assembly and seal-
ing faces to note").
34
C
(cont.)
2. Install the supplied safety assembly:
Either to the on-site line in the heating
water return
or
to the secondary circuit connection
set (accessory)
Connection set installation
instructions
3. Fill and vent the secondary circuit.
4. Thermally insulate pipes inside the
building.
Note
■ For underfloor heating circuits, install
a temperature limiter to restrict the
maximum temperature in the under-
floor heating system (see chapter
"Connecting a temperature limiter as a
maximum temperature limiter in
underfloor heating systems").
■ Ensure the minimum flow rate, e.g.
with overflow valve (see chapter
"Specification").
■ The secondary circuit must be equip-
ped on site with an expansion vessel.