Chiller Controllers for Hvac Chillers

Looking for a chilling system that is energy efficient, easy to repair, maintain and operate? As the cost of energy and water continues to spiral upwards, architects, builders, planners and environmentalists are constantly on the look out for new technologies that can optimize the operation of process equipment. One of the greatest users of water and energy are the process and industrial cooling systems used in the plastic and hvac industries. For this equipment to operate at peak efficiency, they need to be monitored constantly. This is now possible with programmable controls like the pCO controller from Carel.

Our new line of chillers can be remotely controlled from the comfort of your office. With these programmable controllers, you can control up to 10 chillers (or 20 compressors) making them operate at the highest efficiency possible. Not only can you optimize the cooling capacity so that it matches your cooling load at all times, these controllers can make diagnostics a breeze and repairs much faster. Our new line of pCO controllers (with remote master) are specifically designed for the control of chiller temperature by cycling of compressors. Thanks to a variety of plug-in serial cards and external gateways, pCO can share data with any popular Building Management System (BMS) in the market. This includes any management system using the BacNetTM, Lonworks®, Modbus®, SNMP and the JCI's N2 Open® protocols Thanks to this new controller, the control software for single-circuit chillers, heat pumps, small roof-top units and, precision air conditioners, can be quickly customized based on each manufacturer's requirements.

Functions

• Our chiller controller with remote master is for controlling 3 to 10 chillers. (up to 20 compressors).
• Stages the chillers on return water.
• It lead lags the compressor to equalize run-time to within 24 hours.
• Prevents short-cycling of compressors, minimum on-time and minimum off-time.
• Stages compressors at start-up to reduce in-rush current.
• Allows you to monitor the operation of the chiller and its fault conditions.
• Sets off an alarm and keeps track of 20 fault conditions enabling easy repair of the chiller.
• Remote monitoring by BMS by one of the following interfaces listed below.
• Allows remote monitoring over the Internet.

The graphic display models are capable of showing symbols and trends in graph form for easier comprehension of the data. Icon-based languages, from Chinese, Japanese, Cyrillic, to Arabic are all supported. Any of these terminals can be labeled with the OEM's name, colors and logo.

The pCO series boards are enclosed in plastic covers which guarantee the high mechanical protection of the board and reduce the risk of electrostatic discharge due to incorrect handling. Quick DIN rail mounting means faster assembly and wiring. Expansion I/O boards are also available.

Thanks to a variety of plug-in serial cards and external gateways, pCO can share data with any popular Building Management System (BMS) in the market. BacNetTM, Lonworks®, Modbus®, SNMP, JCI's N2 Open®, and Trend/Novar protocols are all compatible. The pCO can also be connected to a modem for remote communication to a supervisor, or to send SMS messages to GSM cellular phones. Data communication to Intranet//Internet networks is also available by using a gateway(WEBG0000B0) that converts Carel protocol to 10Mb/s TCP/IP EthernetTM protocols (FTP, HTTP, SNMP).

In addition to the serial port mentioned above, the pCO features a pLAN (pCO Local Area Network) port for intra-controller communication. This enables up to 32 controllers to share data together, or it can be used to expand available I/O. More importantly, the plan port makes achieving an intelligent distributed architecture possible: including master/slave relationships, redundancy, modular controls, and lead-lag operation can all be implemented. The pCO's high memory capacity (up to 6MB of FLASH RAM) stores the application and parameters permanently, preventing data loss in the event of power failure and without requiring a battery backup! Troubleshooting is made easy by logging alarms and other events, such as temperatures, status of controlled devices, and date/time into the expansion memory. ("Black Box" mode). The recorded data can also easily be transferred to a PC (locally or via modem) and opened using Excel for analysis.

Thanks to EasyTools, the graphical application program development package for all Carel OEM programmable controllers, software portability is a snap. Application programs designed for other Carel programmable controllers are easily implemented to newer hardware platforms, preserving any investments made on prior controllers.

The pCO features mechanical relays and solid state relay outputs (SSR, see I/O specifications here) and comes with a built-in user-interface, avoiding the expense of a remote terminal. It accepts a variety of sensors in the market such as Carel's NTC temperature sensors, 0-1Vdc, 0-20mA, 4-20mA, 0-5Vdc ratiometric transducers, and dry contacts.

Several user interfaces including display and keypad are also available in conjunction with the built-in LCD display: graphic backlit LCD display, alphanumeric LCD display, backlit alphanumeric LCD display, and LED display are all provided in wall-mount or panel-mount plastic enclosures.

BMS interface

The CAREL controllers can be connected to the BMS in the following ways:

• directly thanks to the ability of the pCO sistema series controllers to select the protocol used;
• using a gateway that converts the CAREL proprietary protocol to the protocol used by the BMS;
• integrating the driver for the management of the CAREL propriety protocol into the BMS.

The following popular protocols and systems are used by the CAREL controllers to ensure connectivity to the other systems:

Under the BACnet system there are three types:

• BACnet over Ethernet
• BACnet over IP
• BACnet over MS-TP

Contact us today:
Tel: 1.877.513.8330
Email: sales@tandemchillers.com

Tel: 1.877.513.8330
Fax: 905.513.8358
Email: sales@tandemchillers.com