5.8.9.
Connecting two heating circuits with
pressure breaker
On
/o
ff
OT
BL
SE
xt
PCU
DHW
X20
SCU
SCU
T
S
+
B
A
B
0
-1
0
V
S
AM
B
C
4
3
2
1
2
1
+
-
S
AM
B
B
2
1
S
AM
B
A
2
1
S SYST
+
T
A
-
S ECS
S EXT
S DEP
C
2
1
2
1
2
1
2
1
2
1
S D
EP
B
2
1
T
S
+
C
A
U
X
C
1
4
3
2
5
5
13
11
6
7
8
12
10
9
5
14
C004456-B
A
Connect a safety thermostat if the heating circuit is for
underfloor heating.
4
Remove the bridge.
4
Connect the wires from the safety thermostat to the
connector.
Z
Connect the 3-way valve flow sensor (circuit
B
).
E
Connect the heating pump (circuit
B
).
R
Connect the 3-way valve (circuit
B
).
T
Do not connect anything to the terminal block.
5. Installation
AFC 18 - AFC 24 - AFC 30
72
09/07/2015 - 300026439-07