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Product information
CRA24-..
Controller for apartments
CRA24-B3(P)
Room controller with three outputs:
• Supply air device
• Exhaust air device
• Heating valve
CRA24-B1P
3-step switch with one output
• Supply air/exhaust air device
www.belimo.com
1 / 24
CRA24-... • en-gb • 2013-05-15 • Subject to changes
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Table of Contents
Related Manuals for Belimo CRA24 Series
Summary of Contents for Belimo CRA24 Series
- Page 1 Room controller with three outputs: • Supply air device • Exhaust air device • Heating valve CRA24-B1P 3-step switch with one output • Supply air/exhaust air device www.belimo.com 1 / 24 CRA24-... • en-gb • 2013-05-15 • Subject to changes...
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Page 2: Table Of Contents
Design for supply / wire sizing Commissioning / power on behaviour Test and simulation mode Internal function test Control sequence simulation Testing and setting of VAV controller 2 / 24 www.belimo.com CRA24-... • en-gb • 2013-05-15 • Subject to changes... -
Page 3: System Overview
Fan optimiser fan control (only for VAV systems) COU24-A-MP Service tool for VAV-Compact ZTH-GEN Setting for VAV-Compact MFT damper actuator PC-Tool Connecting cable ZTH-GEN for CRA24-B3(P), diagnostic socket 1/2 ZK1-VAV www.belimo.com 3 / 24 CRA24-... • en-gb • 2013-05-15 • Subject to changes... -
Page 4: Brief Description Cra24-B3(P)
The CR24 controller generation forms the basis of modern single room concepts. The microprocessor-controlled room temperature controller is perfectly adapted to the BELIMO actuators for motorised air and water control valves with respect to technology, functionality and handling. -
Page 5: Brief Description Cra24-B1P
Three LEDs indicate the respectively active level. Type CRA24-B1P with step switch via push-button. Accessories Mechanical accessories Type Description CRZA-A Spare cover without user interface CRZW Spare baseplate www.belimo.com 5 / 24 CRA24-... • en-gb • 2013-05-15 • Subject to changes... - Page 6 CRA24-.. CRA24-.. 6 / 24 www.belimo.com CRA24-... • en-gb • 2013-05-15 • Subject to changes...
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Page 7: Technical Data Sheet
– P-Band 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 Adjustment range 15 … 36°C (Default 21°C) – Energy hold off (EHO) Heating –2 K Room temperature (frost protection) 14°C... -
Page 8: Product Features
Override kitchen System output VAV controller exhaust Other connections – Not used Override bathroom PP1 Diagnostic socket VAV controller supply PP2 Diagnostic socket VAV controller exhaust air 8 / 24 www.belimo.com CRA24-... • en-gb • 2013-05-15 • Subject to changes... -
Page 9: Operating
Rotary knob for Control sequence simulation The diagnostic sockets 1 and 2 help in PP communication with the ZTH-GEN / PC-Tool connection connected Belimo MFT actuators or VAV-Compact controllers. This makes physical access to the field devices unnecessary. www.belimo.com 9 / 24... -
Page 10: Functions
– External temperature sensor (Type NTC 5 kΩ, operating range 10 … 45°C) 3 outputs – 2 … 10 V system output for supply air: Belimo VAV controller, damper actuator – 2 … 10 V system output for exhaust air: Belimo VAV controller, damper actuator –... -
Page 11: Control Strategy Of Air Volume
The MIN/MAX levels of the MF actuator can be programmed with the ZTH-GEN service tool or using an -SR standard actuator (mode 0 … 10V), e.g. LM24A-SR! the Belimo PC-Tool and then be loaded in L/NM24A-MF. The "Air volume" control strategy is configured with the help of DIP switch 2 = OFF. Configuration... -
Page 12: Control Strategy Of Room Temperature
Heating Cooling Heating Cooling / Heating Heating Cooling / Heating CLOSED CLOSED CLOSED [°C] [°C] [°C] Comfort Minimum Maximum COMF COMF COMF 12 / 24 www.belimo.com CRA24-... • en-gb • 2013-05-15 • Subject to changes... -
Page 13: Reset Max → Comf
100% = 100% = Extract air (ao2) 100% = 100% = Heating valve (ao3) No function Control mode COMF AC 24 V Bathroom ai/di1 CRA24-B3 www.belimo.com 13 / 24 CRA24-... • en-gb • 2013-05-15 • Subject to changes... -
Page 14: External Temperature Sensor (Ai1)
External temperature sensor (ai1) An external NTC temperature sensor can be connected at analogue input ai1. Sensor type: NTC 5k (5 kΏ) e.g. Belimo TFK. Typical applications • Temperature measurement in the exhaust air duct for recording the average room temperature. -
Page 15: Analogue Outputs
1 2 9 10 11 6 7 8 1 2 9 10 11 6 7 8 CRA24-B3 CRA24-B3 Thermo valve actuator 3-point valve actuator www.belimo.com 15 / 24 CRA24-... • en-gb • 2013-05-15 • Subject to changes... - Page 16 CRA24-.. CRA24-.. 16 / 24 www.belimo.com CRA24-... • en-gb • 2013-05-15 • Subject to changes...
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Page 17: Technical Data Sheet
• Parallel connection of other actuators possible. Note the performance data. 1 2 3 CRA24-B1P 1 2 3 γ supply air VAV-controller 1 2 3 γ extract air VAV-controller www.belimo.com 17 / 24 CRA24-... • en-gb • 2013-05-15 • Subject to changes... -
Page 18: Operating
(air volume 30...70%) Operation level 3 – Service Test Connecting terminals measuring points Measuring points Measuring points for all connection terminals (also during operation). Connecting terminals 18 / 24 www.belimo.com CRA24-... • en-gb • 2013-05-15 • Subject to changes... -
Page 19: Functions
– Mode selection switch: COMF – MIN – MAX – Mode indication LED: COMF – MIN – MAX – Hidden rotary knob for setpoint adjustment: 30…70% air 1 output – 2…10V system output: Belimo VAV controller, damper actuator Functions – Air volume control Installation... - Page 20 CRA24-.. CRA24-.. 20 / 24 www.belimo.com CRA24-... • en-gb • 2013-05-15 • Subject to changes...
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Page 21: Dimensions, Installation, Commissioning, Service
The number of terminals and their allocation may differ, depending on the model. AC 24 V 2.5 mm 1.5 mm 1.5 mm Terminal connection 1 … 12 www.belimo.com 21 / 24 CRA24-... • en-gb • 2013-05-15 • Subject to changes... -
Page 22: Design For Supply / Wire Sizing
– Wire sizing values for room temperature controllers, 3 VA per CRA24-B3 / 2 VA per CRA24- – Wire sizing values for control devices, VAV controllers, damper actuators, valves, etc. can be found in the latest data sheets and product information (www.belimo.com) – Other devices to be operated with the AC 24V supply –... -
Page 23: Internal Function Test
Checking and setting the VAV controllers The connected VAV controller is controlled and adjusted with either the ZTH-GEN Service tool or the Belimo PC-Tool. The connection to the ZK1-VAV cable is established via the two diagnostic sockets under the front cover of CRA24-B3(P). - Page 24 Worldwide present Complete assortment from a single source Examinded Quality Short delivery time Comprehensive support Belimo Europa BELIMO Automation AG Brunnenbachstrasse 1 CH-8340 Hinwil Tel. +41 43 843 61 11 Fax. +41 43 843 62 68 info@belimo.ch www.belimo.ch Belimo weltweit: www.belimo.com...
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