CR24-A3 Room temperature controller with 3 sequences AC 24 V Auto mode - Belimo
£204.12
£170.10
On request
SKU
CR24-A3
Next Supplier Stock Update: 15/03/2025
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Manuals & Datasheets
| DATA-SHEET |
 |
| Product type | Controller |
| IP rating | IP30 |
| Manufacturer | Belimo |
| Power Supply | 24Vac/Vdc |
| Parametric | Room Controller |
| Programmable | Controllers |
CR24-A3 Room temperature controller with 3 sequences AC 24 V Auto mode
• Room temperature controller with 3 sequences
• AC 24 V
• Auto mode, without manual operation
• Setpoint: 18...35º C
• Temperature sensor: NTC internal 0, external: 10...45º C
• 5 inputs: EHO, Stand-by, (C/O / Boost / dewpoint),
• 0...10 V shift, ext. temperature sensor
• 3 outputs: VAV 0 / 2...10 V, heating 3-point,
• Heating / cooling 0...10 V
• Control characteristics: modulating, P-controller, P-Band switchable
• Housing colour white RAL 9003
• Base colour light grey NCS 2005 -R 80 B
Features
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 temporarily unoccupied.
Frost: The frost protection function is activated if the actual room temperature falls below 10°C.
Change-over: Change-over heating or heating/cooling.
Chilled ceiling with dew point limiting: Chilled ceiling with dew point limiting
Boost: The room can be ventilated with the maximum volume flow (max) or heated or cooled with themaximum capacity.
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.
• 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 / PI– 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 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 devices 2 x PP (for PC-Tool, MFT remote control etc.)
• 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 3 x analog– VAV system output (ao1) (0) 2 ... 10 V, max. 5 mA– Heating / cooling output (ao2) 0...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 ofapprox. 150 s)
• Norms und standards Protection classIII Safety extra-low voltageDegree of protectionIP 30 to EN 60529Mode of operationType 1 to EN 60730-1Software classA 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