Data Sheet for Product

10/12
Siemens Building Technologies Heat-pump controller for wall mounting ACR12.481 CE1N3577en
HVAC Products 27.05.2004
The alarm contact is wired serially with the return air sensor. An open input at B2, M
means alarm. The compressor is operated through an external relay YC. The electric
heater is also operated through an external relay YHE. Note that the external wiring of
the compressor and the electric heater is not shown here.
The alarm input and the return air sensor have the same potential as the supply
voltage of AC 230 V.
S1 Window contact, occupancy detector YC Relay for Compressor
SA Alarm contact (normally closed) YR Reversing valve
B2 Return air sensor YHE Relay for electric heater
M1 3-speed fan
Project engineering
and wiring notes
• Wiring, fuses and earthing must be installed in compliance with local regulations.
It must be made certain that safety extra low voltage lines (SELV circuits) are clearly
separated from AC 230 V mains voltage cables
(also refer to Installation Instructions G3577)
• The cables to the controller, external sensor, fan, valves and to the electric heater
carry AC 230 V and must be appropriately dimensioned.
• Only sensors and valves rated for AC 230 V may be used
• The 230V mains power supply line must have an external fuse or circuit breaker
with a rated current of not more than 10 A
• The controller is designed for withstanding overload currents which can occur in
connection with defective loads or wiring and which can be quite high before the
fuse in the 230V supply line (max. 10 A) interrupts the current.
Heat pump
with electric heater
and return air sensor
and alarm input.
Important:
Legend to the connecti-
on diagrams:
Important:
3.5 VA
max.
L
N
Q1 Q2 Q3 N Y1
3.5 VA
max.
N Y10
760 VA max.
3577D07
B2 M
B2
L
M1
3
YHE
N
S1
AC 230 V / 50/60 Hz
DU1 GND
SELV
YC
T
SA
10 A max