SHUNT CONTROLLED ADDITIONAL HEAT
NOTE
Mark up any junction boxes with warnings for
external voltage.
This connection enables an external additional heater,
e.g. an oil boiler, gas boiler or district heating exchanger
to aid with heating.
The connection requires that the boiler sensor (BT52)
is connected to one of the AUX inputs in F1355, see
page 30. The sensor is only selectable when “shunt
controlled add. heat” is selected in menu 5.1.12.
F1355 controls a shunt valve and start signal to the ad-
ditional heating using three relays. If the installation does
not manage to maintain the correct supply temperature,
the additional heat starts. When the boiler sensor (BT52)
exceeds the set value, F1355 transmits a signal to the
shunt (QN11) to open from the additional heat. The
shunt (QN11) adjusts so the true supply temperature
corresponds with the control system’s theoretically
calculated set point value. When the heating demand
drops sufficiently so that the additional heat is no longer
required, the shunt (QN11) closes completely. Factory-
set minimum run time for the boiler is 12 hours (can be
adjusted in menu 5.1.12).
The settings for shunt controlled additional heat are
made in menu 4.9.3 and menu 5.1.12.
Connect the shunt motor (QN11) to terminal block
AA101-X7:4 (230 V, open) and 3 (230 V, close).
To control switching the additional heat on and off,
connect it to terminal block AA101-X7:2.
Till/Från
1 2 3 4
F1345
E
xternt
L
N
M
External
F1355
On/Off
AA101-X7
All additional heat can be blocked by connecting a poten-
tial-free switch function to AUX input on terminal block
AA3-X6 and AA101-X10. The function must be activated
in menu 5.4.
ADDITIONAL HEAT IN TANK
NOTE
Mark up any junction boxes with warnings for
external voltage.
This connection enables an external additional heater in
the tank to assist the hot water production when the
compressors are busy producing heating.
Additional heat in tank is activated in menu 5.1.12.
To control switching the additional heat on and off in
the tank, connect it to terminal block AA101-X7:4.
All additional heat can be blocked by connecting a poten-
tial-free switch function to AUX input on terminal block
AA3-X6 and AA101-X10. The function must be activated
in menu 5.4.
NIBE F1355Chapter 5 | Electrical connections28
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