Viessmann VITOCAL 222-S Installation And Service Instructions Manual page 35

Connections on the DHW side
For connecting the DHW side, observe DIN 1988 and DIN 4753 .
B
F
A
C
D
A DHW
B DHW circulation pump
C Spring-loaded check valve
D Heat pump connecting chamber
(plan view)
E Expansion vessel, suitable for drink-
ing water
F Visible discharge pipe outlet point
G Safety valve
Information on drinking water filter
According to DIN 1988-2, a drinking
water filter should be installed in systems
with metal pipework. We also recom-
mend 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.
G
K H
H L M
N
E
Installation sequence
O
H P R H M O
N
H Shut-off valve
K Flow regulating valve
L Pressure gauge connection
M Non-return valve/pipe separator
N Drain valve
O Cold water
P Drinking water filter
R Pressure reducer
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