Viessmann Vitoligno 300-H Installation And Service Instructions For Contractors page 25

Making the connections on the heating water side
Overview of connections
Fig. 17
Boiler return
A
Boiler flow
B
C Safety assembly connection
Connections
Boiler return
A
Boiler flow
B
Safety assembly connection
C
(male thread)
Installing the return temperature raising facility
If the automatically controlled return temperature rais-
ing facility (accessories) is to be used, install it now.
Making the safety connections
Safety equipment block installation instructions
Install the safety lines.
Permiss. operating pres-
sure
Test pressure
D
E
R 1
½
DN 40
PN 6
R 1
½
DN 40
PN 6
G 1
½
Note
The connection between boiler and expansion vessel
must not be interrupted by shut-off devices.
Information regarding the safety valve
Equip boilers with a safety valve that is type-tested to
3 bar (0.3 MPa)
TRD 721 [or local regulations] and is marked accord-
ing to the system version.
4.5 bar (0.45 MPa)
(cont.)
Safety heat exchanger, DHW drain pipe
Safety heat exchanger, cold water inlet
Installation instructions for return temperature
raising facility
Installation sequence
25