Data Sheet for Product

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Siemens Building Technologies Heat-pump controller for wall mounting ACR12.481 CE1N3577en
HVAC Products 27.05.2004
Terminal assignment
DU1 Operating mode control input, SELV
GND
Measuring neutral for
control input
M
Measuring neutral for sensor
B2 Return air sensor QAH11.1 or alarm input
N, L Power supply AC 230 V
Y1 Output for external relay for compressor / AC 230 V
Q1 Control output for fan speed 1 / AC 230 V
Q2 Control output for fan speed 2 / AC 230 V
Q3 Control output for fan speed 3 / AC 230 V
Y10 Control output for reversing valve or for electric heater relay / AC 230 V
Connection diagrams
An open input at B2, M means alarm. The compressor is operated through an external
relay YC. The reversing valve can be connected directly to Y10 if the power of the coil
is within the limits of 3.5VA. Note that the external wiring of the compressor is not
shown here.
The alarm input has the same potential as the supply voltage of AC 230 V.
Heat pump
with reversing valve
and alarm input.
Important:
GND
B2
DU1
M Y1
Y10
NN L Q1
Q3Q2
N
3.5 VA
max.
L
N
Q1 Q2 Q3 N Y1
3.5 VA
max.
N Y10
760 VA max.
3577D06
B2 M
SA
L
M1
3
YR
N
S1
AC 230 V / 50/60 Hz
DU1 GND
SELV
YC
10 A max