Nibe SMO 20 - Maintenance and Energy Saving; Regular System Checks; Energy Saving Tips

Connections
NOTE
To prevent interference, unscreened commu-
nication and/or sensor cables to external con-
nections must not be laid closer than 20 cm
from high voltage cables.
POWER CONNECTION
SMO 20 must be installed via an isolator switch with a
minimum breaking gap of 3mm. Minimum cable area
must be sized according to the fuse rating used.
1N
L
X1
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
X1
1 1N
L
0 432PE
TARIFF CONTROL
If there is a loss of voltage to the compressor in the heat
pump for a certain period, simultaneous blocking of this
must take place via a software-controlled input (AUX
input) in order to avoid alarms, see page 26.
CONNECTING THE CHARGE PUMP FOR THE
HEAT PUMP
Connect circulation pump (EB101-GP12) to terminal
block X4:5 (PE), X4:6 (N) and X4:7 (230 V) on the base
board (AA2) as illustrated.
Connect control signal for (EB101-GP12) to terminal
block X2:1 (PWM) and X2:2 (GND) as illustrated.
987654
SMO
E
xternt
PE
L
N
External
SMO20
AA2-X4
EB101-GP12
LEK
L N 1 1 0 2 3 4PE
AA2-X4
2
1
4
3
SMO
E
xternt
External
SMO20
X2
EB101-GP12
PWM
GND
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
X2
5
6
7
2
1
8
9
13
12
4
3
11
10
19
20
21
14
18
16
17
15
NIBE SMO 20Chapter 5 | Electrical connections20