CR24-B2E Room temperature controller with manual operation 2 heating levels, 1 VAV-sequence, AC 24 V Selection mode

CR24-B2E Room temperature controller with manual operation 2 heating levels, 1 VAV-sequence, AC 24 V Selection mode

•    Room temperature controller with manual operation
•    2 heating levels, 1 VAV-sequence, AC 24 V
•    Selection mode, display: AUTO / ECO / MAXIMUM
•    Setpoint: 18...35º C, rotary button: +/- K
•    Temperature sensor: NTC 10...45º C internal / external
•    5 outputs: EHO, Stand-by / Boost,
•    0...10 V shift, ext. temperature limiter
•    3 outputs: VAV 0/2...10 V,
•    Heating for 1...3 level electric air heater or radiator valve
•    Control characteristics: 2-point and modulating, P-controller
•    Housing colour white RAL 9003
•    Base colour light grey NCS 2005 -R 80 B


Shipped under 2 days

Excl. Tax: £94.67 Incl. Tax: £113.60

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.

Boost: The room can be ventilated with the maximum volume flow (max) or heated up with themaximum capacity.

Supply air temperature limiter: An optional mounted sensor allows to control the supply air temperature to a maximum of 50°C.

Vmax at heating: For electrical reheaters the air volume at the heating condition can optionally be increased.

Output mode: The do3 output mode can be set accordingly to the application to

                          – stage for one-stage electrical reheater or on/off radiator valve

                          – binary for two-stage electrical reheaters (stage I: ¹/₃, stage II: ²/₃) which will be ¹/₃, ²/₃, ³/₃

Soft start (Roll-out feature): The build-in start-up and roll-out of the stage control provides temperature excess protection. This helps to avoid service calls due to switched-off safety chains and reduces the electrical load after a power-fail.

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 30...50°C– External setpoint shift (ai2) 0...10 V corresponds to 0...10 K– Digital inputs (di1, di2, di3) Contact rating 10 mA
•   Outputs 1 x analog, 2 x digital – VAV system output (ao1)(0) 2 ... 10 V, max. 5 mA– Heating output (do3), 2 stages Triac, AC 24 V, max. source current 0.5 A / 10 VA
•   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 Cover NCS2005-R80B light gray (corresponds approx. to RAL 7035) RAL 9003-Signalweiss