CRA24-B3 - Belimo Room control unit with operation Regulation of volumetric flow or temperature

CRA24-B3 - Room control unit with operation Regulation of volumetric flow or temperature

•    Room control unit with operation
•    Regulation of volumetric flow or temperature
•    2 VAV and 1 heating valve outputs, AC24V
•    Mode selection display: COMF / MIN / MAX
•    Setpoint: 15...36º C, rotary button: +/- K
•    Temperature sensor: NTC 10...45º C internal/external
•    3 inputs: kitchen, bathroom, EHO
•    3 outputs: ZUL-/ABL-VAV 0/2...10 V, heating valve 3-pt or thermo actuator
•    Min / Max room temp. control
•    Test and simulation functions
•    Housing colour white RAL 9003
•    Colour of socket light grey NCS 2005/R80B

Features

• Control strategy air volume The air volume can be pre-selected and set to minimum, variable (dial: 30 … 70 %) and maximum using the push-button and the rotary knob. This is especially suitable for applications requiring a defined air change. The heating output is not available.
  
  
• Control strategy room temperature The desired comfort temperature can be selected using the rotary knob. The room controller controls the air volumes as well as the heating valve on the basis of the set parameters.


• Override kitchen Pressure differences caused by the kitchen hood fan or the chimney extraction system are balanced out as far as possible by reducing the exhaust air volume.


• Override bathroom Volume currents are increased to the maximum air change in order to draw off humid air from rooms as quickly as possible.
  
  
• Energy hold off (EHO) The room is controlled in the energy saving mode, i.e. the VAV units are closed and the heating setpoint is lowered by 2K during long periods of absence, for example.
  
  
• Room protection (Frost) If the current room temperature falls below 14°C, the room protection function is activated.
  
  
• External temperature sensor An external temperature sensor can be connected to the analogue input ai1, e.g. in the exhaust air duct for calculating the average room temperature.

•    Nominal voltage AC 24 V 50/60 Hz
•    Dimensioning 3 VA, without actuators
•    Power supply range AC 19.2 … 28.8 V
•    Connection    Cable 1 m, 3 x 0.75 mm2
•    Torque (nominal torque)    Min. 2 Nm @ nominal voltage
•    Connections Terminal block 1 … 3: 2.5 mm2 Terminal block 4 … 12: 1.5 mm2
•    Control characteristics– P band P Selectable: 1.5 K or 3.0 K
•    External temperature sensor (ai1) Type NTC, 5 k, power supply range 10 … 45°C e.g. Belimo Type TFK
•    Setpoint Setting range 15 … 36°C (Default 21°C) – Energy hold off (EHO) Heating –2 K
•    Sound power level Max. 35 dB (A)
•    Room temperature (frost protection) 14°C
•    Max Room temperature (frost protection) 28°C
•    Operation – Mode switch and status display (LED) COMF (green) – MIN (orange) – MAX (red) – Dial for setpoint adjustment 30 … 70% air / ±3 K temperature
•   1 x analogue, 3 x digital – External temperature sensor (ai1)  Type NTC, 5 k, power supply range 10 … 45°C – Digital inputs (di1, di2, di3)) Contact rating 10 mA
•    3 x analogue or digital – Supply air VAV system output (ao1) 2 … 10 V, max. 5 mA – Exhaust air VAV system output (ao2) 2 … 10 V, max. 5 mA – Heating output (ao3) 2- / 3-point, AC 24 V, source current max. 0.5 A / 10 VA (optimised for actuators with approx. 150 s runtime
•    Protection class III Safety extra-low voltage
•    Degree of protection IP30 (EN 60529)
•    Mode of operation Type 1 (EN60730-1)
•    Software class A (EN 60730-1)
•    EMC CE according to 2004/108/EC
•    Ambient conditions – Operation 0 … +50°C / 20 … 90% rH (non-condensing) – Transport and storage –25 … +70°C / 20 … 90% rH (non-condensing)
•    Dimensions (H x W x D) 99 x 84 x 32 mm
•    Base plate NCS2005-R80B-light grey (corresonds to approx. RAL 7035)
•    Cover RAL 9003 signal white