78
CONFIGURATION OF CASCADED THERMAL UNITS
4.3.2
Electrical connections - Diagram 1
MANAGING CONNECTIONS
MO1
26
...
27
28
P. 123 = 2
pm
pb
INAIL
INAIL
20
21
...
22
23 +5V
GND
SIGNAL
FL
15
16
13
12
11
10
14
SE
SS
SB
9
7
8
BUS 2
depending 1
terminals 1 e 2
BUS 1
TA/OT
P. 117 = 3
P. 188 = 1
P. 122 = 3
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
13
12
11
10
9
8
7
6
5
4
...
14
15
16
PC
PB
PI (*)
MO2
18
17
...
L
N
L - DHW (N.O.)/PB/PI
N
L
N
P.125 = 2
P.128 = 3
P.187 = 1
PWM
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
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