25
Overview of connections
Fig. 17
A
Boiler return
B
Boiler flow
C
Safety assembly connection
D
Safety heat exchanger, DHW drain pipe
E
Safety heat exchanger, cold water inlet
Connections
A
Boiler return
R
DN
PN
1
½
40
6
B
Boiler flow
R
DN
PN
1
½
40
6
C
Safety assembly connection
(male thread)
G
1
½
Installing the return temperature raising facility
If the automatically controlled return temperature rais-
ing facility (accessories) is to be used, install it now.
Installation instructions for return temperature
raising facility
Making the safety connections
Safety equipment block installation instructions
Install the safety lines.
Permiss. operating pres-
sure
3 bar (0.3 MPa)
Test pressure
4.5 bar (0.45 MPa)
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
TRD 721 [or local regulations] and is marked accord-
ing to the system version.
Installation sequence
Making the connections on the heating water side
(cont.)
5679249
Installation
