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Table Of Contents

562

Room thermostat

RAA21...

Adjustable for heating only

or cooling only

• 2-position control

• Switching voltage AC 24…250 V

Use

The RAA21.. room thermostat is used in heating only or cooling only systems to main-

tain the selected room temperature.

Typical use:

• Residential buildings

• Light industrial buildings

In conjunction with

− zone valves or thermal valves

− gas or oil burners

− fans

− pumps

Functions

The RAA21.. 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 temperature exceeds the selected setpoint, the cooling contact will close.

CE1N3562en

2016-03-25

Building Technologies

Summary of content (6 pages)

PAGE 1
3 562 Room thermostat RAA21... Adjustable for heating only or cooling only • • 2-position control Switching voltage AC 24…250 V Use The RAA21.. 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 or thermal valves − gas or oil burners − fans − pumps Functions The RAA21.. room thermostat has separate outputs for heating only and cooling only.
PAGE 2
Function diagrams Heating ON Cooling T SD w ON W Y1 Y2 W Room temperature Switching differential Room temperature setpoint Output signal "Heating" Output signal "Cooling" Type summary Functionality Product no. (ASN) Room thermostat for heating or cooling mode Switching voltage AC 24...250 V RAA21 Equipment combinations Description Product no. (ASN) Data sheet*) SFA21... STA21... STP21...
PAGE 3
Notes Mounting, installation and commissioning AC 24…250 V The thermostat should be located where the room temperature can be acquired 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 thermostat can be fitted to most commercially available recessed conduit boxes or directly on the wall. Only authorized personnel may open the unit to perform service.
PAGE 4
Technical data Power Switching capacity Voltage Current Frequency AC 24...250 V 0.2…6(2.5) A 50 or 60 Hz No internal fuse External preliminary protection with max. C 10 A circuit breaker in the supply line required under all circumstances Screw terminals for 2 x 1.5 mm2 (min. 0.
PAGE 5
Connection diagrams max. 10 A max.
PAGE 6
/6  2011(- 2016) Siemens Switzerland Ltd Siemens Building Technologies Room Thermostat RAA21 Subject to change CE1N3562en 2016-03-25