3 882 Non-communicating RXA29.1

3 882 Non-communicating RXA29.1
3
882
DESIGO™ RXA
Non-communicating
room controllers
RXA29.1
For fan-coil systems
The RXA29.1 room controller are used for temperature control in individual rooms.
 For 2-pipe or 4-pipe fan-coil systems, with or without changeover
 Control of AC 24 V PWM 1) thermic valve actuators, 3-position AC 24 V valve
and damper actuators
 PI control
 AC 230 V operating voltage
1)
PWM = pulse-width modulated
Use
The RXA29.1 room controller is optimised for control of fan-coil systems in individual
rooms.
CA2N3882en_01
30 Jun 2009
Siemens Building Technologies
Functions
The controller application and the configuration of connected field devices are defined
manually with DIP switches and a potentiometer.
For a detailed description of functions, refer to the DESIGO RXA applications library,
document CA2A3886.
Types
Type
RXA29.1/FC-04
AC 24 V triac outputs
For two thermic valve actuators
or two 3-position actuators
RXZ20.1
Accessories: terminal covers
Relay outputs
None
Ordering
When ordering, please specify the quantity, product name and type code. The RXZ20.1
terminal covers are supplied in packs of 10 pairs and must be ordered as a separate
item (see also “Mounting”).
Example:
30
30
Room controllers, type RXA29.1
Pairs of terminal covers
RXA29.1/FC-04
RXZ20.1
Compatibility
The QAA24 and QAA27 room temperature sensors and the Siemens field devices are
suitable for use with the RXA29.1 room controller.
For details, refer to the product range description, document CA2S3880.
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Building Technologies
Non-communicating room controllers
RXA29.1
CA2N3882en_01
30 Jun 2009
Design
The RXA29.1 room controller consists of a housing base, a housing cover and the
printed circuit board. The printed circuit board incorporates the connection terminals
and the DIP switches used for configuration. The controllers also have a potentiometer
for setpoint adjustment and testing, and a Service LED with different flashing patterns
to indicate operational status and test states.
00608
Cable restraints
Connection
terminals
DIP switches
Housing cover
Housing base
Service LED
Connection
terminals
Terminal cover
Potentiometer
Terminal covers (RXZ20.1) are available as an option, to protect the connection
terminals from physical contact and dirt. The Service LED and the potentiometer
remain visible even with the terminal covers fitted. The potentiometer can be operated
with a screwdriver. The cable is connected to the room controller by breaking out the
perforated cable entry guide.
7 02 00
Removing the terminal cover
Label
3882Z01
Protection standard
Temperature range
(0 … 50 °C)
Serial No.
Test date, series
(Z, A, B, C…)
090601A
513
Observe notes
in this document
Programmed application
Location
Note
Options for use of the labeling fields “Appl.” and “Loc.”:
– Handwritten entry of location and the final application or
– Printed adhesive label
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Building Technologies
Non-communicating room controllers
RXA29.1
CA2N3882en_01
30 Jun 2009
Connection terminals
STOP
Caution
To avoid incorrect wiring, terminals which can be connected to AC 230 V (supply and
relay outputs) are physically separate from the other terminals.
The cable restraints on the housing base must be
used for the connections to terminals 19 … 28
(AC 230 V). The conductors must be secured with
cable ties (see diagram).
80160
Disposal
The device is classified as waste electronic equipment in terms of the European Directive 2002/96/EC (WEEE) and should not be disposed of as unsorted municipal waste.
The relevant national legal rules are to be adhered to.
Regarding disposal, use the systems setup for collecting electronic waste.
Observe all local and applicable laws.
Engineering
For information on selecting and sizing the cables for the power supply and for the field
devices, refer to the installation guide, document CA2Z3884. The room controllers have
an AC 230 V mains supply voltage. The controlled devices (valves and damper
actuators) are supplied directly from the room controller. This means that a separate
AC 24 V supply is not necessary for the RXA29.1 controller and the associated field
devices.
Master/slave
 Where several room controllers are operating in the same space, they must be
synchronized via the master/slave interface.
 Up to 3 slaves may be used (operating in parallel).
 The outputs of the master controller are mapped in the slaves. Note that room units
connected to a slave controller cannot be operated.
 The polarity of the M/S wires has to be respected!
 The master/slave interface is compatible with the PRFA and PRFB controllers in the
PRONTO range.
AC 230 V
supply cables
Sizing and fuse protection of the supply cables depends on the total load and on local
regulations. The cables must be secured with cable restraints.
AC 24 V triac outputs
The simultaneous load on outputs Y1 … Y4 must not exceed 9.5 VA.
Example: Y1 (heating)
2 thermic valve actuators, type STP72E 6 W
Y2 (cooling)
2 thermic valve actuators, type STP72E 6 W
Y3, Y4 (outside air) Damper actuator 3.5 VA
3.5 VA
The maximum load is 9.5 VA for the heating sequence and 9.5 VA for the
cooling sequence. This is acceptable because the two sequences never
operate at the same time.
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RXA29.1
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Mounting instructions
The room controllers can be mounted in any orientation using the following fixing
options:
00609
00610
Rail mounting
The housing base is designed for snapmounting on DIN rails, type EN50022-35x7.5
(can be released with a screwdriver)
Surface mounting
There are two drill holes for screw-mounting (see
“Dimensions” for drilling template).
The housing base is fitted with raised supports.
Screws: Max. diameter 3.5 mm, min. length 38 mm
STOP
Note!
Tightening torque for fixing screws max. 1.5 Nm
When mounting note the following:
 The controller should not be freely accessible after mounting
 Ensure adequate air circulation to dissipate heat generated during operation.
 Easy access is required for service personnel

Local installation regulations must be observed.
Mounting instructions and a drilling template are printed on the controller packaging.
Commissioning
The controller application and the configuration of the connected field devices are
defined manually with DIP switches and the potentiometer. The Service LED provides
information on power up and operational status.
There is no special test for checking that the connected field devices match the DIP
switch settings. Depending on the application, if the controller has insufficient
information it switches to "Idle" mode (all outputs at zero) and the LED remains on
continuously.
For details refer to the applications library CA2A3886.
STOP
Caution
In the event of a long-term short circuit or overload, the thermal fuse in the
transformer may trip. The controller must then be replaced.
There is no protection against accidental connection with 230 V on the AC 24 V
side.
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Non-communicating room controllers
RXA29.1
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30 Jun 2009
Technical data
Power supply
Operating data
Inputs
Outputs
Interfaces
Cable connections
Single cable lengths
Housing protection standard
Protection class
Ambient conditions
Standards and directives
Operaing voltage
Rated voltage
Frequency
Power consumption with
output field devices connected
Internal fuse
Control algorithm
Signal inputs D1 … D3 (for volt-free contacts)
Quantity
Contact voltage
Contact current
Contact transfer resistance
Contact insulation resistance
Not suitable for pulse control
Measured value inputs B1 and B2
Type of signal is programmable (DIP switch)
Temperature sensor
Measuring range
Sensor current
Resolution
Measuring error at 25 °C sensor temp. (without
cable)
Setpoint adjuster
Reset range
AC24 V triac outputs , Y1 … Y4
Quantity
Output voltage (SELV, not earthed)
Max. 12 VA
Thermal, non-resetting
PI
3
DC 16 V
DC 8 mA
Max. 100 
Min. 50 k
LG-Ni 1000 temperature sensor
or setpoint adjuster
LG-Ni 1000
0 ... 50 °C
2.3 mA
0.2 K
Max. 0.2 K
BSGN-U1
+/– 3K
4
AC 24 V ON/OFF, PWM or 3-position
(depending on application)
Output current
Max. 0.5 A
Total nominal load
Max. 9.5 VA
(at both outputs simultaneously)
(e.g. 2 thermic valves, type STE72 per heating and
cooling sequence + 1 damper actuator 3.5 VA)
Master/slave interface
Proprietary
Max. number of slaves
3
2
Connection terminals for signals and power
Stranded or solid conductors, 0.25 … 2.5 mm
2
supply (screw terminals)
or (solid conductors only) 2 x 1.5 mm
Signal inputs D1…. D3
Max. 100 m with diameters  0.6 mm
Measured value inputs B1 and B2
Max. 100m where A  1.5 mm2
AC24 V triac outputs , Y1 … Y4
Max. 100m where A  1.5 mm2
Interface to slaves
Max. 50 m where A = 0.75 mm2
Cable type
2-core, twisted pair, unscreened
Protection standard to EN 60529
IP30 with terminal cover fitted and
wall mounted without DIN rail
IP20 for all other mounting arrangements
Suitable for use in systems with protection class I or II
Operation
Transport
Class
3K5 to IEC 60721-3-3
Class 2K3 to IEC 60721-3-2
Temperature
0 ... 50 °C
– 25 ... 65 °C
Humidity
< 85 % rh
< 95 % rh
Product safety
Automatic electronic controls for
household and similar use
EN 60730-1
Electromagnetic compatibility
Immunity (industrial & domestic)
EN 60730-1
Emissions (domestic)
EN 60730-1
compliance
Meets requirements of EMC Directive
2004/108/EC
Low Voltage Directive
2006/95/EC
C-Tick conformity (EMC)
Reduktion gefährlicher Substanzen
Dimensions
Weight
AC 230 V ± 10 %
AC 230 V
50/60 Hz
See dimension diagrams
Excluding packaging
AS/NZS 61000-6-3
2002/95/EG
0.59 kg
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Building Technologies
Non-communicating room controllers
RXA29.1
CA2N3882en_01
30 Jun 2009
Connection terminals and operator controls
RXA29.1
00601 b
6
7
8
9
10 11 12 13
DIP
ON
Y4
G
Y3
Y2
G
Y1
1 2 3 4 5 6 7 8 9 10 11 12
D3
5
D2
4
GND
B2
M
T
3
D1
2
B1
1
S 1...12
T
M
M
AC 230 V
19 19 21 21
M/S -
M/S +
L
L
N
N
R1
14 15
Measured value inputs
B1
1
Measured value input for LG-Ni 1000 sensor or setpoint adjuster
M
2
Measured value input ground
B2
3
Measured value input for LG-Ni 1000 sensor or setpoint adjuster
Signal inputs
D1
4
Signal input (window or clock)
GND 5
Signal ground
D2
6
Signal input (occupancy)
D3
7
Changeover input
Triac outputs
Y1
8
AC 24 V, 0.5 A switching output
G
9
AC 24 V actuator supply
Y2
10
AC 24 V, 0.5 A switching output
Y3
11
AC 24 V, 0.5 A switching output
G
12
AC 24 V actuator supply
Y4
13
AC 24 V, 0.5 A switching output
Master / Slave interface
M/S+ 14/15 Master/slave connection
Power supply
N
19
Neutral conductor
L
21
Phase conductor AC 230 V +/- 10 %
Operator controls
S1...12
DIP switch for configuring the room controller.
R1
Potentiometer for setpoint reset and test purposes.
STOP
Caution!
Local installation regulations must be observed.
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Non-communicating room controllers
RXA29.1
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Connection diagrams
Connecting the field
devices, room units and
supply voltage
N1
00603 b
B1
1
M
2
B2
3
D1
4
GND
5
T
B1
B1.1
T
B2
B2.1
D1
D2
6
D2
D3
7
D3
Y1
8
Y1
G
9
Y2
10
Y3
11
G
12
Y4
13
GL
M
Y1.1
GL
M
Y3.1
Y2
M/S– 14
14
M/S+ 15
15
N
19
N
19
N
L
L
21
21
L
N1
N2...N4
B1, B2
B1.1, B2.1
D1, D2
D3
Y1, Y2
Y1.1, Y3.1
Y3.2
RXA
M
Y3.2
N2...N4
AC 230 V
RXA29.1
Max. 3 slave controllers
LG-Ni 1000 temperature sensor
Setpoint adjuster
Volt-free contacts (window contact, occupancy sensor, central time switch etc.)
Changeover signal
AC 24 V thermic valve actuators
Valve actuator, AC 24 V, 3-position (RXA21.1 only)
Damper actuator with spring return
Twisted pair
Note
For information on the compatibility of the various field devices with the RXA29.1 room
controller, refer to the relevant application description.
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Non-communicating room controllers
RXA29.1
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Connecting a
power amplifier
Parallel connection of a number of thermic valve actuators to output Y1 using the UA1T
power amplifier.
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)
AC 24 V
G0 G
70206
N1
Y1
6
G
7
Y1
N2
1
NS
COM
8
2
LS
Y1
7
3
COM
COM
6
4
X1
Y1
5
1
NS
COM
8
2
LS
Y1
7
3
COM
COM
6
4
X1
Y1
5
Y1.1
Y1.1
N2
N1
N2
Y1
Y1.1
Notes
Y1.1
Y1.1
RXA29.1
UA1T (see data sheet CA2N3591)
AC 24 V thermic valve actuator
AC 24 V thermic valve actuator (max. 2 STP72E 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.
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Non-communicating room controllers
RXA29.1
CA2N3882en_01
30 Jun 2009
Dimensions
00611
133,2
1,5
Dimensions in mm
3,3
35,3
Without
terminal covers
3,9
1
62
With terminal covers
51,5
40,8
12
62
167
35,3
70210
3,9
1
112,4
107,8
00612
Drilling diagram
39
78
3,8
43,2
86,3
 2001 - 2009 Siemens Building Technologies AG
Subject to technical alterations
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Non-communicating room controllers
RXA29.1
CA2N3882en_01
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