EXTERNAL CIRCULATION PUMP
Connect the external circulation pump (GP10) to terminal
block X4:9 (PE), X4:10 (N) and X4:11 (230 V) on the base
board (AA2) as illustrated.
SHUTTLE VALVE
SMO 20 can be supplemented with an external reversing
valve (QN10) for hot water control. (See page 49 for
accessory)
Hot water production can be selected in menu 5.2.4.
Connect the external reversing valve (QN10) as illus-
trated to terminal block X4:2 (N), X4:3 (control) and X4:4
(L) on the base board (AA2).
NIBE UPLINK
Connect the network connected cable (straight, Cat.5e
UTP) with RJ45 contact (male) to contact AA4-X9 on the
display unit (as illustrated). Use the cable grommet (UB2)
in the control module for cable routing.
EXTERNAL CONNECTION OPTIONS (AUX)
On terminal block (X2), SMO 20 has software-controlled
AUX inputs and outputs for connecting the external
switch function or sensor. This means that when an
external switch function (the switch must be potential-
free) or sensor is connected to one of the six special
connections, this function for the connection must be
selected in menu 5.4.
block heating
activate temp lux
not used
soft in/outputs5.4
not used
not used
not used
For certain functions, accessories may be required.
Selectable inputs
Selectable inputs on the input board for these functions
are:
X2:11AUX1
X2:12AUX2
X2:13AUX3
X2:15AUX4
X2:16AUX5
X2:17AUX6
GND is connected to terminal block X2:14 or X2:18.
B
SMO Externt
13
14
15
10
12
11
A
LEK
L N 1 1 0 2 3 4PE
21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
5
6
7
2
1
8
9
13
12
4
3
11
10
19
20
21
14
18
16
17
15
The example above uses the inputs AUX1 (X2:11) and AUX3 (X2:13)
on terminal block X2.
Selectable output
A selectable output is AA2-X4:15-17.
TIP
Some of the following functions can also be
activated and scheduled via menu settings.
Possible selection for AUX inputs
Temperature sensor
Temperature sensor can be connected to SMO 20. Use
a 2-core cable of at least 0.5 mm² cable area.
25Chapter 5 | Electrical connectionsNIBE SMO 20
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