Siemens RAA20 User manual

CE1N3002E
05.09.2003
Siemens Building Technologies
HVAC Products
3002
Room Thermostat RAA20
Adjustable for heating only or cooling only
Two-position control
Switching voltage AC 24…250 V
Use
The RAA20 room thermostat is used in heating only or cooling only systems to maintain
the selected room temperature.
Typical use:
• Residential buildings
• Light industrial buildings
In conjunction with
• zone valves, thermal valves
• gas or oil burners
• fans
• pumps
Functions
The RAA20 room thermostat has separate outputs for heating only and cooling only.
If the room temperature falls below the selected setpoint, the heating contact will close.
If the room themperature exceeds the selected setpoint, the cooling contact will close.

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Siemens Building Technologies Room Thermostat RAA20 CE1N3002E
HVAC Products 05.09.2003
Y1
T[°C]
ON
OFF W
SD
3001D01
Y2
T[°C]
ON
OFF
SD
3001D02
T Room temperature
SD Switching differential
w Room temperature
setpoint
Y1 Output signal "Heating"
Y2 Output signal "Cooling"
Equipment combinations
Type of unit Type reference Data sheet
Motoric on/off actuator SFA21... 4863
Thermal actuator (for radiator valve) STA21... 4893
Thermal actuator (for small valve 2,5 mm) STP21... 4878
Accessories
Description Type reference
Adapter plate 120 x 120 mm for 4“ x 4“ conduit boxes ARG70
Adapter plate 96 x 120 mm for 2“ x 4“ conduit boxes ARG70.1
Adapter plate for surface wiring 112x130 mm ARG70.2
Technical design
Key features of the RAA20 room thermostat:
• Two-position control
• Gas-filled diaphragm
Adjustments
The required temperature is selected by a setpoint adjuster on the front of the thermo-
stat.
The setpoint setting range can be mechanically limited by means of setpoint limiter
under the unit cover.
Notes
The room thermostat should be located where the air temperature can be sensed as
accurately as possible, without getting adversely affected by direct solar radiation or
other heat or refrigeration sources.
Mounting height is about 1.5 m above the floor.
The unit can be fitted to most commercially available recessed conduit boxes or directly
on the wall.
Only authorised personnel may open the unit to perform service. (Caution: AC 250 V)
The unit must be isolated from the mains supply before opening.
Function diagrams
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Mounting, installation
and commissioning

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Siemens Building Technologies Room Thermostat RAA20 CE1N3002E
HVAC Products 05.09.2003
When installing the unit, fix the baseplate first, then hook on the thermostat body and
make the electrical connections. Then fit the cover and secure it (also refer to separate
mounting istructions).
The thermostat must be mounted on a flat wall.
The local electrical regulations must be complied with.
If there are thermostatic radiator valves in the reference room, set them to their fully
open position.
The room thermostat is maintenance-free.
The diaphragm is filled with environmentally friendly gas.
The thermostat housing is made of plastic.
Technical data
Switching capacity
Voltage
Current
Frequency
AC 24...250 V
0.2…6 (2) A
50 or 60 Hz
Switching differential SD ≤1K
Setpoint setting range 8…30 °C
Operation
Climatic conditions
Temperature
Humidity
Pollution degree
to IEC 721-3-3
class 3K5
0…+50 °C
<95 % r.h.
normal, to EN 60730
Transport / Storage
Climatic conditions
Temperature
Humidity
Mechanical conditions
Packaging
to IEC 721-3-2
class 2K3/1K3
-20…+50 °C
<95 % r.h.
class 2M2
single packaging / min. order 20 pieces
conformity
Low voltage directive
Product standard
73/23/EEC and 93/68/EEC
EN 60730
N474 C-Tick conformity to
EMC emission standard
AS/NSZ 4251.1:1994
Safety standard
Degree of protection
II to EN 60730
IP30 to EN 60529
Screw terminals for 2 x 1.5 mm2or 1 x 2.5 mm2min.( 0.5 mm2 )
Weight 0.14 kg
Colour white, NCS S 0502-G (RAL 9003)
Maintenance
Mechanical design
Operational data
Environmental conditions
Norms and standards

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Siemens Building Technologies Room Thermostat RAA20 CE1N3002E
HVAC Products 05.09.2003
Connection diagrams
N
L
D1
N1
Y1 Y2
L
T
3001A01
N
L
N1
Y1 Y2
L
D2
T
3001A02
D1 Zone valve or thermal
valve for heating
D2 Zone valve or thermal
valve for cooling
L Switching voltage
AC 24…250 V
N1 Room thermostat
Y1 Control output "Heat-
ing"“, AC 24…250 V
Y2 Control output "Cool-
ing", AC 24…250 V
N Neutral
T Thermostat element
(gas-filled diaphragm)
Dimensions
96,4
99,6
42,8
3002M01
3001M02
30 30
28
3,6
28
86
86
2828 30
30
Unit
Baseplate
2003 Siemens Building Technologies Ltd. Subject to alteration