Siemens RAA20 Manuale utente

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

T[°C]

OFF W

3001D01

T[°C]

OFF

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

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

Y1 Y2

3001A01

Y1 Y2

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

3,6

2828

Unit

Baseplate

2003 Siemens Building Technologies Ltd. Subject to alteration

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