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1
3
2
Master
Slave
Slave
Slave
ACV Max
1 2 3 4 5 6
W
W
W
W
W
W
B
Br
4
5
6
1
2
3
1
2
3
4
6
1
2
3
4
5
X15
1
2
3
4
5
1 2 3 4 5 6 7 8 9 10
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
X11
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
16
17
15
3
4
1
2
X16
1 2 3 4 5 6 7 8 9 10
1 2 3 4 5 6 7 8 9 10 11 12 13 14
W
R
Or
Bk
Bk
V
Bk
4
2 1
3 2 1
1 2 3
1 2 3 4 5 6
8
9
10 11 12
1
2
3
4
5
13
6
14
7
X2
1 2 3 4 5 6 7 8 9 10
W
R
Y
R
Y
W
6
7
8
9
10
1
2
3
4
5
X3
1 2 3 4 5 6 7 8 9 10 11 12
V
W
R
Bk
7
8
9
10 11
1
2
3
4
5
12
6
X1
Bk
2
3
1
14
12
13
X12
X9
P14
1
2
X10
1
2
3
4
1
2
3
4
5
6
B
V
B
W
B
W
B
P13
B
Or
1
2
3
Bk
B
Y/Gr
W
Br
B
Br
Y/Gr
B
1 2 3 4 5 6 7 8
8
7
6
5
4
3
2
1
1
2
3
4
5
6
1
2
3
5
F00
X100
W
ON / OFF
3
230 V ~ 50Hz
1
N
L
N
L
N
L
2
6
25
B
Y/Gr
Br
B
Y/Gr
Br
Br
B
Bk
B
Y/Gr
Y/Gr
Y/Gr
Y/Gr
Y/Gr
Y/Gr
Y/Gr
V
B
Y/Gr
W
B
Y/Gr
Br
B
Y/Gr
Br
B
Y/Gr
B
Or
Y/Gr
X101
18
20
19
21
24
4
B
W
B
V
Br
X20
26
X18
V
W
B
W
B
B
9 10 11 12 13 14 15 16
X100
7
Y/Gr
Y/Gr
5A
T F
use
5A
T F
use
5A
T F
use
BK
BK
Bk
Bk
R
Bk
Y
Y
R
R
W
W
V
Y
Bk
Bk
R
Bk
W
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
W
W
W
W
W
W
W
V
1
2
3
4
5
1 2 3 4 5
8
2 1
1
NTC 5
9
2 1
1
NTC 2
10
2 1
1
NTC 1
11
16
15
14
13
12
11
10
9
B
Br
Y/Gr
B
Br
B
Br
Y/Gr
P4
P3
FL
27
1
2
3
1
2
1
2
3
4
1
2
3
4
5
6
X7
X4
X6
X5
Bus A
Bus - Ground
Bus B
0-10 Volt - Ground
0-10 Volt - Input
Cascade sensor - Ground
Cascade sensor - Input
NTC 3
NTC 4
1
2
22
23
4
5
6
System Control - ACVMax: 660Y2800 • C
en
50
EN
FR
NL
ES
IT
DE
PL
RU
CONFIGURATION OF CASCADE SYSTEMS - SOLO (2 PUMPS)
CASCADE SYSTEM CONNECTION (4-BOILER CASCADE)
Set-up conditions
•
Gas conversion done as required
•
Boilers switched off using the ON/OFF master switch
•
External power supply closed
•
Gas supply closed
•
Master boiler of the system defined
•
Front panel of the boilers open (refer to the relevant procedure in the Installation, Operation and Mainte-
nance Instructions provided with the boiler)
Required accessories
Designation
P/N
QTY
Cascade connection wire harness
257F1166
3
Connection Procedure
Refer to the diagram below for a general cascade connection scheme.
1.
Connect the 4-terminal end connector (
3
) of the cascade connection harness (
1
) to the X16 terminal (
4
)
of the electronic board on the Master boiler.
2.
Route the wire harness as shown in (
6
).
3.
Connect the 6-terminal end connector (
2
) of the cascade connection harness (
1
) to the socket located
at the bottom of the front panel of the boiler, accessing from underneath (
5
).
Follow-on tasks
1.
Make all the heat demand connections (eg. Room thermostats, sensor connections (DHW sensor, Cas-
cade sensor) and pump connections to the Master appliance (see also following pages for the hydraulic
and electrical configurations).
2.
Connect the local Slave appliance pumps.
3.
Close the front panel of the boilers.
4.
Perform Cascade start-up procedure, refer to “Cascade start-up process” on page 51.