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CONFIGURATION OF CASCADED THERMAL UNITS
4.3.2
Electrical connections - Diagram 1
MANAGING CONNECTIONS
MO1
28
INAIL
27
INAIL
26
...
23 +5V
22
GND
21
SIGNAL
20
...
16
15
14
13
12
11
10
9
8
BUS 1
7
M01
Low-voltage terminal board
pm
Minimum pressure switch
pb
Lockout pressure switch
FL
Flow-meter
TA/OT Room thermostat / Open Therm Interface
SB
Boiler sensor
SE
Outdoor sensor
SS
System sensor
BUS 1 Managing / Zones Bus
pb
P. 123 = 2
pm
FL
P. 117 = 3
TA/OT
SB
P. 188 = 1
SE
SS
P. 122 = 3
BUS 2
depending 1
terminals 1 e 2
80
MO2
...
18
L
17
N
16
15
14
N
13
L - DHW (N.O.)/PB/PI
12
11
L
10
N
9
8
7
6
PWM
5
4
GND
...
M02
High-voltage terminal board
PI
System pump (high temperature)
PB
DHW circulator
FL
Flow-meter
PC
Thermal unit circulation pump
L
Live
N
Neutral
Earth/ground
(*)
In place of the fuel shut-off valve VPLG
PI (*)
P.125 = 2
PB
P.128 = 3
PC
P.187 = 1
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