Connecting The Dhw Side; Safety Valve; Connecting The Solar Circuit; Connecting A Cooling Circuit If Required - Viessmann Vitocal 242-S Installation And Service Instructions Manual

Installation sequence

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. 24
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.
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.

Connecting the solar circuit

Connect the solar circuit on site.

Connecting a cooling circuit if required

For area cooling systems (e.g. underfloor heating cir-
cuit, chilled ceiling), a contact humidistat (accessory) is
required.
30
O
K L M H
H
N
E
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