The Honeywell CPO-RL4 is a highly versatile, BACnet-compliant room controller belonging to the Comfort Point Open (CPO) family. It is specifically designed to provide integrated control for sophisticated HVAC applications, including fan coil units, chilled ceilings, and underfloor heating. The Honeywell CPO-RL4 offers a flexible “all-in-one” approach to room automation, combining high-resolution control logic with native communication capabilities to optimize energy consumption while ensuring occupant comfort in modern commercial buildings.
Technical Parameters and Datasheet
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Product ID: CPO-RL4
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Brand: Honeywell
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Series: Comfort Point Open
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Communication: BACnet MS/TP
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Input/Output Ports: 4 Universal Inputs, 3 Analog Outputs, 4 Digital Outputs (Relay)
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Dimensions: 150 mm x 110 mm x 58 mm
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Weight: 0.42 kg
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Country of Origin: Germany / USA
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Operating Voltage: 24V AC, 50/60 Hz
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Housing Material: Plastic, UL94-V0 rated for plenum installation
Application Fields
The CPO-RL4 is a primary choice for high-end office buildings, luxury hotels, and modern educational facilities. It excels in applications requiring precise temperature and air quality regulation, such as controlling 2-pipe or 4-pipe fan coil units with variable speed fans. Its onboard relay outputs make it suitable for direct control of electric heaters and thermal actuators, while the universal inputs allow for the integration of occupancy sensors, window contacts, and CO2 monitors to drive demand-controlled ventilation (DCV) strategies.
Product Instructions
For physical installation, mount the CPO-RL4 on a standard 35mm DIN rail or directly to a flat surface within the ceiling void or a dedicated room control box. Ensure that the 24V AC power leads are correctly phased to prevent ground loop issues across the BACnet network. The controller features removable terminal blocks for easier field wiring. Programming and commissioning are performed using the Comfort Point Open Studio software, which allows for the downloading of pre-configured applications or the creation of custom logic. When connecting to the BACnet MS/TP trunk, ensure the baud rate matches the rest of the network and that the proper end-of-line (EOL) termination is applied to the last controller in the chain.
Common Questions and Answers
Q: Does the CPO-RL4 support wireless sensors? A: The base CPO-RL4 is a wired controller; however, it can be integrated with Honeywell’s EnOcean or other wireless gateways through the BACnet network to incorporate wireless wall modules and sensors.
Q: Can this controller be used for lighting control? A: While primarily an HVAC controller, its digital outputs and BACnet visibility allow it to participate in basic lighting sequences (such as occupancy-based switching) as part of a total room automation strategy.
Q: How do I reset the controller to factory defaults? A: A hardware reset button is located under the front cover. Pressing and holding this button for more than 10 seconds during power-up will typically clear the application logic and reset the communication parameters to their default state.
Recommended Similar Models
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Honeywell CPO-RL1 (Compact version)
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Honeywell CPO-RL6 (High I/O count version)
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Honeywell CPO-PC-600 (Plant Controller)
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Honeywell TR42 LCD Wall Module (Compatible Interface)
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Honeywell Spyder PUB6438S BACnet Controller
