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CH2
CH1
Low
DHW
DHW
P4
Prestige
P3
CH
W
2
W
1
LOW T° SCHEMA : 4a
en
43
System Control - ACVMax: 660Y2800 • C
EN
FR
NL
ES
IT
DE
PL
RU
PRESET CONFIGURATION 12 - SOLO (2 PUMPS)
High and Low temperature heating circuit, possibly with optional outdoor
temperature sensor and room thermostat, and with DHW circuit.
Pump Configuration 12
Flex 4
ERR
Flex 6
P4
Flex 3
P3
Flex 2
DHW
Flex 1
CH
Flex 5
Flame
Mix open
CH1/CH2/
DHW
CH2
DHW
CH1 low
Mix close
Electrical board terminals
Terminal name --> Connected to
AC
V M
ax
1
2
3
4
5
6
1
2
3
4
5
6
W
W
W
W
W
W
4
5
6
1
2
3
1
2
3
4
6
X
15
1
2
3
4
5
6
7
8
9
10
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
X
11
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
16
15
3
4
1
2
X
16
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
BK
BK
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
R
Bk
Y
Y
Bk
Bk
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
Bk
2
3
1
14
12
13
X
12
X9
P
14
1
2
3
4
1
2
3
4
5
6
B
V
B
W
P
13
B
Or
1
2
3
Bk
B
Y/Gr
W
Br
B
Br
Br
Y/Gr
B
B
1
2
3
4
5
6
7
8
8
7
6
5
4
3
2
1
1
2
3
5
F0
0
X
10
0
N
L
N
L
W
ON / OFF
3
230 V
~ 50Hz
1
N
L
N
L
N
L
2
6
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
Br
B
Br
Y/Gr
B
X
101
18
17
20
19
21
24
4
X
10
1
2
X20
1625
2
1
1
NTC 5
9
2
1
1
NTC 2
10
2
1
1
NTC 1
11
1
2
3
1
2
1
2
3
4
1
2
3
4
5
6
X7
X4
X6
X5
Bus A
Bus - Gr
ound
Bus B
0-1
0
Volt - Gr
ound
0-1
0
Volt - Input
Cascade sensor - Gr
ound
Cascade sensor - Input
NTC 3
NTC 4
1
2
22
23
26
X
18
V
W
B
W
B
B
9
10
11
12
13
14
15
16
16
15
14
13
12
11
10
9
X
10
0
7
Y/Gr
Y/Gr
B
W
B
W
B
V
B
Br
Y/Gr
B
Br
B
Br
Y/Gr
P4
P3
FL
27
5AT Fuse
5AT Fuse
5AT Fuse
............. ERR
-->Motorized 3-way valve OPEN
............. DHW
-->DHW pump
............. CH
-->CH pump (low temp circuit)
............. P4
-->P4 pump
............. Flame
-->Motorized 3-way valve CLOSE
............. P3
-->P3 pump (CH2 circuit)
ACV Max
1
2
3
4
5
6
1 2 3 4 5 6
W
W
W
W
W
W
4
5
6
1
2
3
1
2
3
4
6
X15
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
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
BK
BK
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
R
Bk
Y
Y
Bk
Bk
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
Bk
2
3
1
14
12
13
X12
X9
P14
1
2
3
4
1
2
3
4
5
6
B
V
B
W
P13
B
Or
1
2
3
Bk
B
Y/Gr
W
Br
B
Br
Br
Y/Gr
B
B
1 2 3 4 5 6 7 8
8
7
6
5
4
3
2
1
1
2
3
5
F00
X100
N
L
N
L
W
ON / OFF
3
230 V ~ 50Hz
1
N
L
N
L
N
L
2
6
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
Br
B
Br
Y/Gr
B
X101
18
17
20
19
21
24
4
X10
1
2
X20
16
25
2 1
1
NTC 5
9
2 1
1
NTC 2
10
2 1
1
NTC 1
11
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
26
X18
V
W
B
W
B
B
9 10 11 12 13 14 15 16
16
15
14
13
12
11
10
9
X100
7
Y/Gr
Y/Gr
B
W
B
W
B
V
B
Br
Y/Gr
B
Br
B
Br
Y/Gr
P4
P3
FL
27
5A
T F
use
5A
T F
use
5A
T F
use
............. DHW sensor (NTC3)
............. Optional outdoor temp. sensor (NTC4)
............. Optional room thermostat
AC
V M
ax
1
2
3
4
5
6
1
2
3
4
5
6
W
W
W
W
W
W
4
5
6
1
2
3
1
2
3
4
6
X
15
1
2
3
4
5
6
7
8
9
10
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
X
11
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
16
15
3
4
1
2
X
16
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
BK
BK
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
R
Bk
Y
Y
Bk
Bk
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
Bk
2
3
1
14
12
13
X
12
X9
P
14
1
2
3
4
1
2
3
4
5
6
B
V
B
W
P
13
B
Or
1
2
3
Bk
B
Y/Gr
W
Br
B
Br
Br
Y/Gr
B
B
1
2
3
4
5
6
7
8
8
7
6
5
4
3
2
1
1
2
3
5
F0
0
X
10
0
N
L
N
L
W
ON / OFF
3
230 V
~ 50Hz
1
N
L
N
L
N
L
2
6
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
Br
B
Br
Y/Gr
B
X
101
18
17
20
19
21
24
4
X
10
1
2
X20
1625
2
1
1
NTC 5
9
2
1
1
NTC 2
10
2
1
1
NTC 1
11
1
2
3
1
2
1
2
3
4
1
2
3
4
5
6
X7
X4
X6
X5
Bus A
Bus - Gr
ound
Bus B
0-1
0
Volt - Gr
ound
0-1
0
Volt - Input
Cascade sensor - Gr
ound
Cascade sensor - Input
NTC 3
NTC 4
1
2
22
23
26
X
18
V
W
B
W
B
B
9
10
11
12
13
14
15
16
16
15
14
13
12
11
10
9
X
10
0
7
Y/Gr
Y/Gr
B
W
B
W
B
V
B
Br
Y/Gr
B
Br
B
Br
Y/Gr
P4
P3
FL
27
5AT Fuse
5AT Fuse
5AT Fuse
Refer to "Accessing the preset configuration page for Solo (2 pumps)" on page 32, to know
how to get to the relevant page of the ACVMax controller.
The room thermostat 1 always controls the low temperature system.
Essential recommendations for the correct operation of the system
•
Low temperature sensor is not shown here, but make sure to install one to control the
circuit (using the additional wiring made available in the optional wiring kit).
•
Low temperature cut-out thermostat is not shown here, but make sure to install one to
protect the low temperature circuit (to be connected to X20 terminal, ref. 13 on Prestige
42-50-75-100-120 Solo wiring diagrams and ref. 14 on Prestige 24-32 Solo/Excellence
wiring diagram).