Connecting The Dhw Side; Connecting A Heating/Cooling Circuit, If Required - Viessmann Vitocal 222-G Installation And Service Instructions Manual

Hydraulic connections
2. Connect secondary lines to the heat pump.
!
Please note
Mechanically loaded hydraulic connections
lead to leaks, vibration and appliance dam-
age.
Connect on-site lines so that they are free of
load and torque stress.
3. Thermally insulate pipes inside the building.

Connecting the DHW side

For connecting the DHW side, observe DIN 1988 and
DIN 4753 (CH: SVGW regulations).
G
B
F
A
C
D
Fig. 17
DHW
A
DHW circulation pump
B
Spring-loaded check valve
C
Heat pump terminal area (plan view)
D
Expansion vessel, suitable for drinking water
E
Visible discharge pipe outlet point
F
Safety valve
G
Shut-off valve
H
Information on drinking water filter
According to DIN 1988-2, a drinking water filter must
be installed in systems with metal pipework. We also
recommend the installation of a drinking water filter
when using plastic pipes, according to DIN 1988, to
prevent contaminants entering the DHW system.

Connecting a heating/cooling circuit, if required

The connection is made via the NC-Box (accessories).
For surface cooling systems (e.g. underfloor heating
circuit, chilled ceiling), provide an on-site contact
humidistat (24 V ).
–
(cont.)
O
K H
H L M
N
E
Note
■ With underfloor heating circuits, install a temperature
limiter to restrict the maximum temperature of under-
floor heating systems: See chapter "Connecting a
temperature limiter to restrict the maximum tempera-
ture in underfloor heating systems".
Ensure the minimum flow rate, e.g. by means of an
■
overflow valve: See chapter "Specification".
H P R H M O
N
Flow regulating valve
K
Pressure gauge connection
L
Non-return valve/pipe separator
M
Drain valve
N
Cold water
O
Drinking water filter
P
Pressure reducer
R
Safety valve
Protect the DHW cylinder with a safety valve against
unduly high pressure.
Recommendation: Install the safety valve higher than
the top edge of the cylinder. This protects the safety
valve against contamination, scaling and high temper-
atures. It also means that the DHW cylinder does not
need to be drained when working on the safety valve.
Installation sequence
21