Product type | Controller |
IP rating | IP30 |
Manufacturer | Belimo |
Power Supply | 24Vac/Vdc |
Parametric | Room Controller |
Programmable | Controllers |
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
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.
• 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