15
MAIN ELECTRIC SCHEME
F
N
GX
TS
ON/OFF
GX
MAIN PCB
SIEMENS
Contact
TS
FT
N
A2
A1
R
SIEMENS
brown
blue
blue
blue
brown
brown
brown
brown
blue
black
black
black
b
row
n
bl
u
b
lu
e
bl
a
c
k
b
la
c
k
b
lac
k
23
0-
240
V
-5
0
TSB
Legend electric scheme
Single phase
F
Neutral
N
Selected phase from contactor
FT
Electric pump (circolatore a prevalenza variabile)
PI
Control of contact TS on contactor of power (C-NO)
cTS
Sanitary microswitch (control Comfort function)
MS
Control gate triac n°1 (4 KW power)
G1
Control gate triac n°2 (2 KW power)
G2
Control gate triac n°3 (4 KW power)
G3
Control gate triac n°4 (2 KW power)
G4
Control gate triac n°5 (2 KW sanitary tank)
G5
Delivery heating probe (ntc sensor)
SM
External probe (sensor)
SE
Sanitary probe (tank)
SB
Water pressure switch
PSA
Safety thermostat
TS
Safety thermostat tank
TSB
Room thermostat (terminal provided)
TA
Connection with remote control OpenTherm (optional)
OT
General switch (Also disconnects power to the board)
ON/OFF
Functional ground derived from the point ground
F.E.
Properly grounded point this application
PE