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Chiller Controllers for Hvac Chillers

It is no secret that chillers require a significant amount of energy to operate. A great deal of time and effort has been spent on reducing these energy requirements. Over the years, in fact, the average performance of chiller systems has been improved, and the efficiency of the compressors and the heat exchangers increased. But even further gains are possible through the optimisation of the management of the units and systems. This is where our chillers leave the competition behind.

Our new line of chillers now feature controllers (with remote master) that are specifically designed to target industrial and commercial HVAC applications. This includes rooftop units, chillers, dehumidifiers, energy recovery systems and precision air conditioners. Thanks to these new controllers, the control software for single-circuit chillers, heat pumps, small roof-top units and, precision air conditioners, can be quickly customised 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 data-comprehension. Icon-based languages, such as Chinese, Japanese, Cyrillic, or Arabic are all supported. Any of these terminals can be brand-labeled with the OEM's name, colors and logo.

pCO series boards are supplied in plastic enclosures that 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. Can this be true? Come see for yourself!

The pCO occupies the top-level position in Carel's 16 bit OEM programmable controller series. It has been designed to satisfy a wide range of applications in the air-conditioning and refrigeration fields. pCO controllers are available in three different sizes, according to the I/O and power requirements: pCO Small, pCO Medium, pCO Large. The pCO is powerful and flexible, excelling at controlling large-size roof top units, precision air conditioners for telecom and data centers, modular chillers, desiccant dehumidifiers, air handling units, energy recovery and make up air units, compressor racks and many other applications in the HVAC and refrigeration markets.

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:

	Introduced in the 1970s and now one of the most widely-used BMS protocols. pCO sistema controllers can communicate directly in Modbus® protocol. Like all CAREL controllers, pCO sistema can also be connected to a Modbus® system using a gateway.
	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.
	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.
	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.
	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.
	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.
	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.
	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.
	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.

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