41
EXCLUSIVE
Multiwire wiring diagram
Blu=Blue/Marrone=Brown/Nero=Black/Rosso=Red/Bianco=White/
Viola=Violet/Rosa=Pink/Arancione=Orange/Grigio=Grey/Giallo=Yellow/
Verde=Green
A
= Gas valve
B
= 230V auxiliary
C
= Not used
D
= Voltage free contact input
AKM0X
Control board
REC
Remote control panel
BE20
Board led:
green led (operating or temporary stop)
red led (boiler in lockout)
X1-X25-CN1
Connection connectors
S.W.1
Chimney sweep and interruption of the venting cycle
E.R.
Flame detection electrode
F
External fuse 3.15A F
F2
Fuse
4A T
M3-M4
Terminal board for external connections: 230V
M20
Electrical box for external connections
(- A B +) Bus 485
Water circuit
A
Cold water input
B
Hot water outlet
C
Water tank delivery
D
Water tank return
E
Heating delivery
F
Heating return
1
Non-return valve
2
Drain valve
3
Safety valve
4
Automatic by-pass
5
Three-way valve
6
Circulator
7
Lower air vent valve
8
Pressure transducer
9
Pressure gauge
10
Expansion vessel
11
NTC return probe
12
Primary heat exchanger
13
NTC delivery probe
14
Limit thermostat
15
Upper air vent valve
16
Air/water separator
17
Water tank (available by request)
3
16
15
A
B
1
C
D
11
12
13
10
7
6
5
3
2
4
14
8
9
E
F
TA
Room thermostat (contact must be free of voltage)
TBOL Water tank thermostat
TBT
Low temperature limit thermostat
SE
Outdoor temperature sensor
OT+
Open therm
SBOL
Water tank probe
X1 - X2
Not used
P
Pump
PWM
PWM signal pump modulation
OPE
Gas valve operator
V Hv
Fan power supply 230 V
TSC2
Ignition transformer
E.A.
Ignition electrode
T.L.A.
Water limit thermostat
S.F.
Flue gas probe
S.M.
Temperature flow sensor on primary circuit
S.R.
Temperature return sensor on primary circuit
T.P.
Pressure transducer
MOD
Modulator
V Lv
Fan control signal
3V
3-way valve stepper servomotor
Qn (Hi) =
230 V ~ 50 Hz W
NOx:
Pms = bar T=
°
C
Pn =
Via Risorgimento 13 - 23900 Lecco (LC) Italy
IP
50-30
°
C
80-60
°
C
Qn
Qn
Qm
kW
kW
kW
kW
kW
80-60
°
C
Qmin
kW
kW
80-60
°
C
Caldaia a condensazione
Condensing boiler
Serial number plate
Heating function
Qn
Nominal heat delivery
Pn
Nominal heat output
Qm
Reduced heat delivery
Qmin
Minimal heat output
IP
Degree of Protection
Pms
Maximum heating pressure
T
Temperature
NOx
NOx class
17
