Optional connections
STEP CONTROLLED ADDITIONAL HEAT
NOTE
Mark up any junction boxes with warnings for
external voltage.
Step-controlled additional heat before the
reversing valve
External step-controlled additional heat can be controlled
by up to three potential-free relays in the control module
(3 step linear or 7 step binary).
The electric additional heat will charge with the maxim-
um permitted immersion heater output together with
the compressor to conclude the hot water charging and
return to charging the heating as soon as possible. This
only occurs when the number of degree minutes is be-
low the start value for the additional heat.
Step-controlled additional heat after the
reversing valve
External step-controlled additional heat can be controlled
by two relays (2 step linear or 3 step binary), which
means that the third relay is used to control the immer-
sion heater in the water heater/accumulator tank.
Step in occurs with at least 1 minute interval and step
outs with at least 3 seconds interval.
Step 1 is connected to terminal block X2:2 on the addi-
tional relay board (AA7).
Step 2 is connected to terminal block X2:4 on the addi-
tional relay board (AA7).
Step 3 or immersion heater in the water heater/accumu-
lator tank is connected to terminal block X2:6 on the
additional relay board (AA7).
The settings for step controlled additional heat are made
in menu 4.9.3 and menu 5.1.12.
All additional heat can be blocked by connecting a poten-
tial-free switch function to the software controlled input
on terminal block X2 (see page 26), which is selected
in menu 5.4.
SMO
E
xternt
654321
1 0 PE
A1
A2
A1
A2
A1
-K1 -K2 -K3
A2
If the relays are to be used for control voltage, bridge
the supply from terminal block X1:1 toX2:1, X2:3 and
X2:5 on additional relay board (AA7). Connect the neutral
from the external additional heat to terminal block X1:0.
RELAY OUTPUT FOR EMERGENCY MODE
NOTE
Mark up any junction boxes with warnings for
external voltage.
When the switch (SF1) is in " " mode (emergency
mode) the circulation pump is activated (EB101-GP12).
Caution
No hot water is produced when emergency
mode is activated.
The emergency mode relay can be used to activate ex-
ternal additional heat, an external thermostat must then
be connected to the control circuit to control the temper-
ature. Ensure that the heating medium circulates through
the external additional heating.
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
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
If the relay is to be used for control voltage, bridge the
supply from terminal block X1:1 to X1:2 and connect
neutral and control voltage from the external additional
heat to X1:0 (N) and X1:4 (L).
NIBE SMO 20Chapter 5 | Electrical connections24
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