Viessmann BWT 221.A06, Installation And Service Instructions Manual, Page: 31 / 124

31
2. Connect secondary pipes to the heat
pump.
3. 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").
■ Safeguard the minimum flow rate, e.g.
by means of an overflow valve (see
chapter "Specification").
Connections on the DHW side
For connecting the DHW side, observe DIN 1988 and DIN 4753 .
M
A
N
B
C
L K
D
H
O
N
H P R H M O H
G
F
E
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
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
Installation sequence
Hydraulic connections
(cont.)
5601 574 GB
Installation