96
1.22 Cascade connections
It is possible to connect up to 6 boilers in a cascade-type connection.
The boilers connected with a cascade-type connection work with the MASTER-SLAVE logic: the first boiler (MASTER) controls the
entire cascade.
The cascade operating devices (optional) must be connected to the MASTER boiler: cascade pump, cascade probe, external probe,
ambient thermostat, 0-10V input, water heater pump, water heater probe.
1
MASTER
eco
esc
menu
ok
Lunedi, 24. Settembre 2012
09.37
2
SLAVE
eco
esc
menu
ok
Lunedi, 24. Settembre 2012
09.37
3
SLAVE
eco
esc
menu
ok
Lunedi, 24. Settembre 2012
09.37
BUS
BUS
39-40 Water heater probe or thermostat
13-14 Cascade pump
4-5 Water heater pump
19-20 Cascade probe
Water heater
23-24
Thermostat
Room
External Probe
21-22
0 -10 V input
25-26
M3
M4
M3
M4
230 Vac
50 Hz
230 Vac
50 Hz
230 Vac
50 Hz
M3 = MASTER
M4 = SLAVE
1.22.1 Electrical connections
For electrical connection of cascade boilers, use the cables supplied with the proper cable glands that must be fastened to the boiler
bottom.
For the electric cascade connection of the boilers, refer to the following diagram:
1
9
2
0
2
1
2
2
2
3
2
4
2
5
2
6
2
7
2
8
2
9
3
8
3
9
4
0
4
1
4
2
4
3
4
4
M3 M4
1
9
2
0
2
1
2
2
2
3
2
4
2
5
2
6
2
7
2
8
2
9
3
8
3
9
4
0
4
1
4
2
4
3
4
4
M3 M4
MASTER M3
SLA
VE M4
MASTER M3
1
9
2
0
2
1
2
2
2
3
2
4
2
5
2
6
2
7
2
8
2
9
3
8
3
9
4
0
4
1
4
2
4
3
4
4
M3 M4
SLA
VE M4
MASTER
SLAVE
SLAVE
preset for cable glands
Fig. 36 Cascade connection