User Manual

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Siemens RXC20, RXC21, RXC22 – Room controllers CA2N3834en_12
Building Technologies 2015-12-23
Up to 2 thermic actuators can be connected directly to the room controller.
In the case of more than 2 actuators a power amplifier is required.
The same principle applies to outputs Y2 … Y4.
Note that the simultaneous load on outputs Y1 … Y4 must not exceed 9.5 VA.
Power consumption at input X1 of the UA1T: 0.5 VA.
Mixed operation: Connecting thermic actuators to the controller as well as to the
power amplifier is NOT allowed.
Differing voltage of the internal transformer of the controller and the supply of the power
amplifier may cause big differences in the position of the valves.
AC 230 V
00105 A
Y1
N1
L
N
Y1
G
L
N
Y1.1
1
2
3
4
NS
LS
COM
X1
AC 24 V
Y1.1
Y1.2
00105 B
Y1
8
7
6
5
COM
Y1
COM
Y1
N2
1
2
3
4
NS
LS
COM
X1
Y1.5
Y1.6
8
7
6
5
COM
Y1
COM
Y1
N2
G G0
Y1.3
Y1.4
Y1.7
Y1.8
N1
L
N
Y1
G
AC 230 V
L N
N1 RXC20, RXC21, RXC22
N2 UA1T (see data sheet CA2N3591)
Y1 AC 24 V thermic valve actuator
Y1.1 AC 24 V thermic valve actuator (max. 2 STA73 / STP73 actuators per Y1 output on the UA1T)
• The UA1T requires an AC 24 V supply voltage
• The UA1T is not suitable for the connection of 3-position actuators.
Parallel connection of
several thermic actuators
STOP
Note!
Connection to controller
C
onnection to
power amplifier
Notes