Temperature sensor (room sensor for cooling, BT74)
An extra temperature sensor (room sensor for cooling)
can be connected to the indoor module in order to better
determine when it is time to switch between heating
and cooling operation.
Connect the temperature sensor to one of the AUX in-
puts X6:7-19 on terminal block X6, which is behind the
front hatch in the indoor module. The relevant AUX input
is selected in menu 5.4. Connect earth to terminal block
X6:GND. Use a 2 core cable of at least 0,5 m² cable area.
AA3-X6
Place the temperature sensor in a neutral position in the
room where the set temperature is required. It is import-
ant that the sensor is not obstructed from measuring
the correct room temperature by being located, for ex-
ample, in a recess, between shelves, behind a curtain,
above or close to a heat source, in a draft from an extern-
al door or in direct sunlight. Closed radiator thermostats
can also cause problems.
Connecting the charge pump (GP12)
Connect the charge pump (GP12) to AA5-X9:4 (230 V),
AA5-X9:3 (N) and X1:3 (PE) as well as AA5-X2:5 and AA5-
X2:6 (signal).
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Unit box External
AA5-X9
X1
GP12
AA5-X2
Connection of the circulation pump (GP13)
Connect the circulation pump (GP13) to AA5-X9:6 (230
V), AA5-X9:5 (N) and X1:3 (PE).
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Unit box External
AA5-X9
X1
GP13
Connection of the reversing valve motor
(QN12)
Connect the motor (QN12) to AA5-X9:2 (signal), AA5-
X9:1 (N) and AA5-X10:2 (230 V).
-X10
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Unit box External
AA5-X9
AA5-X10
QN12
Black
Blue
Brown
DIP switch
The DIP switch (S2) on the accessory card (AA5) must be
set as follows.
ON
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ACS 310 | GB
