CR24-B2 Room temperature controller with 2 sequences AC 24 V Selection mode

CR24-B2 Room temperature controller with 2 sequences AC 24 V Selection mode

•    Room temperature controller with 2 sequences
•    AC 24 V
•    Selection mode, display: AUTO / ECO / MAXIMUM
•    Setpoint: 18...35º C, rotary button: +/- 3 K
•    Temperature sensor: NTC internal 0, external: 10...45º C
•    5 inputs: EHO, Stand-by / ventilation,
•    0 ... 10 V shift, ext. temperature sensor
•    2 outputs: VAV 0 / 2...10 V, heating 3-point
•    Control characteristics: modulating, P-controller,
•    P-Band switchable
•    Housing colour white RAL 9003
•    Base colour light grey NCS 2005 -R 80 B

SKU: CR24-B2

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Product Description



Energy hold off: In energy saving mode, the room temperature is reduced to building protection level, i.e. eitherthe heating setpoint is significantly reduced or the cooling setpoint is significantly increased, forinstance in a room with an open window.

Stand-by: The room temperature is reduced to stand-by level, i.e. either the heating setpoint is slightlyreduced or the cooling setpoint is slightly increased, for instance in a room that is temporarilyunoccupied.

Frost: The frost protection function is activated if the actual room temperature falls below 10°C.

Air flush: The room can be ventilated with the maximum volume flow (max), for instance in order to purge conference rooms, hotel rooms etc.

External temperature sensor: An external temperature sensor can be connected to the analog input ai1, for instance in orderto measure the average room temperature in the exhaust air duct.

External setpoint shift: An external DC 0...10 V signal at the analog input ai2 can be used to shift the basic setpoint 0...10 K, for instance for the summer/winter compensation.

Manuals & Datasheets

Manuals & Datasheets

Manuals & Datasheets
Technical Information

•   Electrical data Nominal voltage AC 24 V 50/60 Hz
•   For wire sizing 3 VA, without actuators
•   Power supply range AC 19.2...28.8 V
•   Connections Terminal block 1...3: 2.5 mm2 Terminal block 4...8: 1.5 mm2
•   Functional data Control characteristics P– P-band heating / cooling Selectable: 1.5 / 1.0 K or 3.0 / 2.0 K
•   External temperature sensor (ai1) Type NTC, 5 kΩ, sensing range 10...45°C for example Belimo type TFK
•   Heating setpoint Range 15...36°C (default 21°C)– Energy hold off Heating 15°C / cooling 40°C– Stand-by Heating –2 K / cooling +3 K
•   Dead band 1 K
•   Frost limit temperature10°C
•   Operation (CR24-B.. only)– Mode switch and status indication (LEDs)AUTO (green) – ECO (orange) – MAX (red)– Rotary knob for setpoint adjustment±3 K
•   Inputs 2 x analog, 3 x digital– External temperature sensor (ai1) Type NTC, 5 kΩ, sensing range 10...45°C– External setpoint shift (ai2) 0...10 V corresponds to 0...10 K– Digital inputs (di1, di2) Contact rating 10 mA
•   Outputs 2 x analog– VAV system output (ao1) (0) 2 ... 10 V, max. 5 mA– Heating output (ao3) 3-point, AC 24 V, max. source current 0.5 A / 10 VA (optimized for actuators with a running time of approx. 150 s)
•   Norms und standards Protection class III Safety extra-low voltage Degree of protectionIP 30 to EN 60529Mode of operation Type 1 to EN 60730-1 Software class A to EN 60730-1 EMC CE conformity to 89/336/EEC
•   Ambient conditions– Operation0...+50°C / 20...90% rH (without condensation– Transport and storage–25...+70°C / 20...90% rH (without condensation
•   Dimensions / Weight Dimensions (H x W x D) 99 x 84 x 32 mm
•   Weight 105 g
•   Housing colors Baseplate CoverNCS2005-R80B light gray(corresponds approx. to RAL 7035)RAL 9003-Signalweiss