AIC Nesta N 120 FS, Installation And Maintenance Manual, Page: 41 / 72

I-41
A-070336_EN • Rev. A
P
roduct
I
nstallatIon
Item
From
(Main board)
Terminal No To Terminals Remark
On/Off switch X1a (A1)
1(N), 2 (PE),
3 (L)
Rear Box (RB)
1 (PE), 2 (N) &
3 (L)
Heating Circuit pump/
DHW pump (opt)
X1b (QX) - QX2 2 (N) & 1 (L) Rear Box (RB) 13 (N) & 14 (L)
Heating Circuit pump/
Flue gas damper (opt)
X1b (QX) - QX3 4 (N) & 5 (L) Rear Box (RB) 10 (N) & 11(L)
Boiler pump X1f (C1) - QX1 2 (N) & 1 (L) Rear Box (RB) 7 (N) & 8 (L)
Fan
X1f (C1) - AC
Fan
7 (N) & 6 (L) item (C4) L & N
Fan PWM
X8 (J1) - Fan
PWM
1 (GND), 2, 3
& 4
item (J2)
GND, +24V,
HALL, PWM
Safety water temp. switch X18 (D1) 1 & 2 item (D2) 230 V
Ignition transformer X2 (E1) 3 (L) & 4 (N) item (E3) L & N
Gas valve X2 (E1) 1 (L) & 2 (N) item (E2) L & N
Ionization electrode X3 (T1) item (T2)
Gas pressure switch X5a (H1) - H6 1 (S) & 2 (GND) item (Z1) 2 (S) & 3 (GND)
System temp sensor / Multif. X5a (H1) - BX1 3 (S) & 4 (GND) Front panel 1 (FP1) - BX1
(Z2)
1 (S) & 2 (GND)
Cascade return temp sensor
(opt) / Multif.
X5a (H1) - BX2 5 (S) & 6 (GND) Front panel 1 (FP1) - BX2 (Z3) 9 (S) & 10 (GND)
Flue gas sensor X5a (H1) - BX3 7 (S) & 8 (GND) item (H3)
DHW sensor (opt) X5a (H1) - B38
9 (S) & 10
(GND)
Front panel 1 (FP1) - B38 (Z4) 3 (S) & 4 (GND) Optional item
Outside temperature sensor
(opt)
X5a (H1) - B9
11 (S) & 12
(GND)
Front panel 1 (FP1) - B9 (H5) 5 (S) & 6 (GND) Optional item
Enable/Disable - multifunc-
tional
X6a (L1) - H1 1 (S) & 2 (GND) Front panel 1 (FP1) - H1 (L4) 7 (S) & 8 (GND)
Door temp. limit switch X6a (L1) - H4 5 (S) & 6 (GND) item (L3)
Condensate level switch X6a (L1) - H5 7 (S) & 8 (GND) item (L2)
Analog output /0-10V (opt) X10a (K9) - UX2 1 (S) & 2 (GND) Front panel 1 (FP1) - UX2 (K8) 13 (S) & 14 (GND) Optional item
Analog output / 0-10V (opt) X10a (K9) - UX3 3 (S) & 4 (GND) Front panel 1 (FP1) - UX3 (K7) 15 (S) & 16 (GND) Optional item
Cascading module (opt) X11 Optional item, refer to “Optional Modules” on page I-53
Air pressure switch (opt) X4 (I1) - H7 2 (S) & 7 (GND) item (I8) Optional item
Safety water pressure sensor X4 (I1) - H3 3 (S) & 7 (GND) item (I3)
Ground through terminal 7 Return circuit sensor X4 (I1) - BX4-B7 6 (S) & 7 (GND) item (I2)
Supply circuit sensor X4 (I1) - B2 8 (S) & 7 (GND) item (I4)
Display Unit X50 item
Connected through cable Hub, which is used
for optional modules (refer to “Optional Mod-
ules” on page I-53 ).
P1 PWM X15 (U1) 2 (S) & 1 (GND) Front panel 1 (FP1) - X15 (U2) 11 (S) & 12 (GND)
Web Server (opt)
X16 (I5) 1 (S)
Front panel 1 (FP1) - (W1) 17 (S) & 18 (GND) Optional item
X4 (I1) 7 (GND)
The electronic board is protected by 2 fuses (T6.3AH 250V)
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