Viessmann Vitocal 222-S Installation And Service Instructions For Contractors page 30

Installation sequence
Connecting the secondary circuit
Connecting the secondary side
Fig. 26
Symbol Meaning
Heating water flow
DHW
DHW circulation
Cold water
Heating water return
Safety valve drain hose
1. Connect the safety valve drain hose
sewage system with a fall and a pipe vent.
2. Connect the "hydraulic connection set, heating cir-
cuit for installation on finished walls" (required
accessories) to the heat pump.
Separate installation instructions
Note
If the DHW circulation pipe is not required, tightly
seal the connection to the heat pump.
30
(cont.)
3. Only for systems with 2 heating circuits and without
heating water buffer cylinder:
For the heating circuit with mixer, fit the "installation
kit with mixer" (accessories) in the heat pump.
4. Connect the hydraulic lines to the heat pump.
!
5. Thoroughly flush the heating system.
6. Check the internal and on-site hydraulic connec-
tions for leaks.
!
Note
The secondary circuit air vent valve is located
inside the appliance. To vent, connect the hose to
Connection
the secondary circuit air vent valve and route out-
G 1
¼
wards.
G
¾
Observe additional information regarding filling and
venting: See "Filling and venting the secondary
G
¾ side".
G
¾
7. Thermally insulate lines inside the building. For
heat pumps with a cooling function, use thermal
G 1
¼
and vapour diffusion-proof insulation.
—
to the public
Separate installation instructions
Please note
Mechanically loaded hydraulic connections
lead to leaks, vibrations and appliance dam-
age.
Connect on-site lines so that they are free of
load and torque stress.
Please note
Leaking hydraulic connections lead to appli-
ance damage.
In the event of leaks, drain off liquid via the
drain valve. Check the seating of seal rings.
Always replace displaced seal rings.