COVID-19 UPDATE - We are still operating so orders will be fulfilled as normal. Some lead times may be affected due to supplier closure but we are endeavouring to ensure minimal disruption to service.

CR24-A1 Room temperature controller with 1 sequence AC 24 V Auto mode

On request
£95.33 £114.40

CR24-A1 Room temperature controller with 1 sequence AC 24 V Auto mode

•    Room temperature controller with 1 sequence
•    AC 24 V
•    Auto mode, without manual operation
•    Setpoint: 18...35º C
•    Temperature sensor: NTC internal 0, external: 10...45º C
•    4 inputs: EHO, (Stand-by / C/O),
•    0...10 V shift, ext. temperature sensor
•    1 output: VAV 0/2...10 V
•    Control characteristics: modulating, P-controller, P-Band switchable
•    Housing colour white RAL 9003
•    Base colour light grey NCS 2005 -R 80 B

More Information


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.

Change-over: Change-over heating or heating/cooling.

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 setpoint0...10 K, for instance for the summer/winter compensation.

Manuals & Datasheets
Technical Information

•   Electrical data Nominal voltage AC 24 V 50/60 Hz
•   For wire sizing 3 VA, without actuators
•   Connections Terminal block 1...3: 2.5 mm2 Terminal block 4...8: 1.5 mm2
•   Functional data Control characteristics P– P-band heating / coolingSelectable: 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 setpointRange 15...36°C (default 21°C)– Energy hold offHeating 15°C / cooling 40°C– Stand-byHeating –2 K / cooling +3 K
•   Dead band1 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
•   Communication port for field devices2 x PP (for PC-Tool, MFT remote control etc.)
•   Inputs2 x analog, 2 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
•   Outputs1 x analog– VAV system output (ao1)(0)2 ... 10 V, max. 5 mA
•   Norms und standardsProtection classIII Safety extra-low voltageDegree of protectionIP 30 to EN 60529Mode of operationType 1 to EN 60730-1Software classA to EN 60730-1EMCCE 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

Manufacturer Belimo