39
9.2
Connections
The following components can be connected to the boiler; see the figure below.
For voltages from 110V to 250V use the left conduit and for low voltage use the right conduit.
9.3
Cascaded connection including shielding
When boilers are cascaded we advise to use a shielded cable to suppress any radiated signals.
Be sure that the shielding of the cable is connected to the screw on the front panel next to terminal 18.
Advice is to connect the shielding only to one boiler to prevent ground loops that may affect the signal.
When connecting cascade cable to the terminals be sure that the right wire is connected to the right terminal: termi-
nals 17 and 18 may not be swapped.
1
2
3
4
5
6
CALORIFIER
SENSOR
or
THERMOSTAT
EXTERNAL
FLOW
SENSOR
OUTDOOR
SENSOR
7
8
9
10
11 12
EXTERNAL
WPS
GENERAL
BLOCKING
EMPTY
13 14 15 16
ON / OF STAT
or
OPEN THERM
HEATING
CIRCUIT
+
-
0 - 10
VDC
17 18
A
B
CASCADE
CONNECTION
19 20
21 22 23 24
LOCK-OUT
N.O.
TOP
OPERATION
N.O.
TOP
HEAT
DEMAND
N.O.
TOP
25 26 27 28 29 30
LOCK-OUT
N.O.
BOTTOM
OPERATION
N.O.
BOTTOM
HEAT
DEMAND
N.O.
BOTTOM
34 35 36
L
N
CH SYSTEM
PUMP P3
37 38 39 40
L1
N
L2
DIVERTOR VALVE
CALORIFIER
COLORIFIERPUMP P2
41 42 43
L
N
INTERNAL
MAIN POWER
CONNECTOR
1
2
3
4
5
6
7
8
9 10 11 12
19 20 21 22 23 24
34 35 36
13 14 15 16
17 18
25 26 27 28 29 30
37 38 39 40
41 42 43
OUTDOOR
SENSOR
EXTERNAL
FLOW
SENSOR
CALORIFIER
SENSOR
OR
THERMOSTAT
GENERAL
BLOCKING
EMPTY
EXTERNAL
WPS
ON/OFF STAT
or
OPEN THERM
HEATING
CIRCUIT
0
–
10
VDC
–
CASCADE
CONNECTION
A
B
LOCK-OUT
N O.
BOTTOM
N O
BOTTOM
N O
BOTTOM
BURNER
BURN NG
HEAT
DEMAND
BY CALOR FIER
PUMP P2
DIVERTOR VALVE
CALORIF ER
INTERNAL
MAIN POWER
CONNECTOR
L
N
CH SYSTEM
PUMP P3
L
N
HEAT
DEMAND
N O
BURNER
BURNING
N O
LOCK-OUT
N O
L1
N
L2
Burner
Burning
Burner
Burning
