Siemens Landis & Staefa RAA20 Manual

Siemens Termostat Landis & Staefa RAA20

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Side 1/4

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

Produkt Specifikationer

Mærke:	Siemens
Kategori:	Termostat
Model:	Landis & Staefa RAA20

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