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7.3
U N V E N T E D
14
11
12
T
B
10
D
V E N T E D
11
12
T
B
D
10
0311704_BFC_28-120_III_ENEN_V2.4, 2022-10-17
Installation diagram
Fig. Installation diagram
14
14
C
3
4
6
5
4
16
15
9
13
H
19
E
17
14
14
14
18
C
4
3
4
5
6
4
9
13
1.
Pressure reducing
valve (mandatory if
the mains water
pressure is too high)
4.
Stop valve
(recommended)
5.
Non-return valve
(mandatory)
6.
Circulation pump
(optional)
9.
Drain valve
10.
Manual gas valve
(mandatory)
11.
Service stop valve
12.
Temperature gauge
(optional)
13.
Condensate drain
14.
Draw-off points
15.
Expansion valve
5
1
4
A
(mandatory)
16.
Expansion vessel
(mandatory)
17.
3-way aeration valve
(recommended)
18.
Cold water head tank
A
4
19.
Float switch
A.
Cold water supply
B.
Hot water outlet
C.
Circulation pipe
D.
Gas supply
E.
Overflow pipe
H.
Overflow protection
C
55
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