TCX 850 Series VAV Controller

TCX 850 Series VAV Controller
TCX 850, TCX 851, TCX 852, TCX 853, TCX 855 Terminal Control Unit
The Infinity TCX 850 family of intelligent, programmable, stand-alone controllers provides cost-
effective Direct Digital Control of individual terminal units: VAV boxes, fan powered induction units,
unit ventilators, heat pumps, etc. The Infinet’s true peer-to-peer communications protocol provides
• Stand Alone DDC for System
the Infinity TCX 850 with the ability to instantly communicate with an Infinity network controller such
as the CX 9200, as well as the entire network of Andover Infinet field controllers. Up to 254 TCX 850s
• Peer-to-Peer Communications
Provide Transparent Data
can be networked with the Infinity CX family of controllers.
Communication to the Infinity TCX 850 is handled via the Infinet bus, a twisted pair, half duplex RS-485 interface. Communica-
• Plain English™ Language
Simplifies Programming
tion is accomplished with a token passing protocol which provides full transparent data transfer between all Infinity controllers
on the network.
• Universal Inputs for Flexible
Control Configurations
Choose the TCX controller with the input configuration that matches your application. The TCX 850 has four full range
• Form A and Tri-State Outputs for
On/Off and Bidirectional Control
Universal inputs that accept voltage (0-5VDC), digital (on/off), counter signals (up to 4 Hz), or temperature signals plus a fifth
input which is an on-board air flow sensor. Three field adjustable potentiometers provide min/max and setpoint adjustments.
• On-Board Pressure Transducer
for Airflow Measurement
The TCX 851 comes without the on board airflow sensor for applications not requiring airflow measurement, such as heat
pumps and fan coils. It contains four Universal inputs but does not contain the three potentiometers.
• Expandable I/O Meets Additional
Point Count Needs
The TCX 852 contains two Universal inputs and the on-board airflow sensor for reduced I/O applications. It does not contain
the three potentiometers.
• Battery Backup for Ten Years
Accumulated Power Failure of
The TCX 853 is for dual-duct VAV applications. It contains two on-board airflow sensors and six Universal inputs. It does not
contain the three potentiometers.
The TCX 855 is identical to the TCX 850, with the exception that it contains a lower range (0-0.2” W.C.) airflow sensor to
meet lower air volume applications.
RAM Memory
Infinity TCX 850, 851, 852, 853, 855, Terminal Control Unit
The TCX 850, 851, 853, and 855 contain three Form A relay outputs for on/off or pulsed control of lighting, heat, and fan
units. One Tri-State output provides bidirectional control of dampers and valves. Optional analog output, pneumatic output,
and high voltage output modules are available.
The TCX 852 contains one Form A output and one Tri-State output for reduced I/O applications.
The TCX 850, 851, 853, and 855 contain the I/O expansion port for the addition of low-cost I/O modules directly on the
bottom of the controller. The family of modules includes the EMX 140 (2 pneumatic outputs), EMX 150 (2 analog outputs),
EMX 155 (2 digital outputs), and the EMX 160 (8 digital inputs). The EMX 170 Programmable Interface provides a low-cost,
wall-mount user interface and temperature sensor. It contains an 8-character LCD display and six programmable
pushbuttons that enable the user to view temperatures, adjust setpoints, and switch to occupied mode.
Every TCX 850 can be configured to meet the exact distributed control requirements of your application using Andover
Controls’ powerful Plain English™ programming language. Programs can be activated within individual TCX 850s or any
network controller. Programs are entered into an TCX 850 using an SX 8000 workstation, the LSX 280 Lap-Top Service Tool,
or network controller. The program is then stored in, and executed by, the TCX 850. The on-board lithium battery keeps
programs backed up in the event of a power failure.
Programming multiple TCX 850s is inherently easy with Plain English™. A complete copy of one TCX 850’s programs can be
loaded directly into other TCX 850s without changing any point names or programs. The SX 8000 workstation makes this
process even easier with its unique drag-and-copy feature.
The dynamic memory of the TCX 850 can be allocated for any combination of Plain English control programs, scheduling,
alarming, and data logging. Our object-oriented language with intuitive keywords provides easy operation and programming. In addition, Plain English’s pre-defined and customized functions and powerful math capabilities reduce programming
time for repetitive applications.
24VAC, 50/60 Hz
Power Consumption:
Overload Protection:
Fused with 2 amp pico fuse. MOV protected.
Software Real-Time Clock:
Synchronized through Infinet by CX or CMX Network Controller.
Operating Environment :
32° - 120°F (0°-50°C) 10-95% RH (non-condensing)
9"H x 5 3/4"W x 2 3/4"D (228H x 146W x 070D)mm
3.5lbs (1.6 Kg)
Enclosure Type:
UL open class, IP 10
Battery Backup:
Replaceable non-rechargeable, lithium battery. Provides 10 years typical
accumulated power failure backup of RAM memory.
Communications Interface:
Through Infinity CX or CMX Network Controller, or LSX 280 Service Tool.
Communications Speed:
1200 to 19.2k baud
Bus Length:
4,000 ft. (1,220m) standard for Infinet, InfiLink amplification module allows
extension to longer distances and is required after every group of 32 units on the
Bus Media:
Infinet: twisted, shielded pair, approved low capacitance cable
Comm. Error Checking:
International Standard CRC 16
TCX 850
4 Universal inputs: Temperature -30°F to 230°F (-34°C to 110°C), Digital (on/off),
Counter (up to 4Hz at 50% duty cycle, 100 ms. minimum pulse width), Voltage (05.115 VDC)
1 airflow sensor (0 to 1” W.C.), 3 On-board adjustable potentiometers
TCX 851
4 Universal inputs, no airflow sensor, no potentiometers
TCX 852
2 Universal inputs, 1 airflow sensor, no potentiometers
TCX 853
6 Universal inputs, 2 airflow sensors, no potentiometers
TCX 855
4 Universal inputs, 1 airflow sensor (0 to 0.2” W.C.),
3 On-board adjustable potentiometers
S P E C I F I C A T I O N S (Cont'd)
Input Voltage Range:
0-5.115 Volts DC
Input Impedance:
10K ohm to 5.120V
lnput Protection:
24VAC or 24 VDC indefinitely on any single channel, ± 1500 volt transients
Input Resolution:
Input Accuracy:
± 15 mV, 0-5.115V range
(± 1.0°F over range of 0 to 120°F)
(.55°C over -17.8°C to 48.9°C)
Airflow Input:
TCX 850
Range: 0 to 1 inch W.C.
Resolution: 0.005 inch of water @ 23°C
Accuracy: ± 5% of full scale or ± 0.05 inches water
TCX 855
Range: 0 to 0.2 inch W.C.
3 single pole single throw (SPST) Form A relays
(TCX 852 has 1 Form A output)
1 Form K Tri-State relay
Digital Output Rating:
5A, 24VAC, ± 1500 volt transients
Digital Output Resolution:
0.1 sec. for pulse width modulation
Expansion Bus:
Interfaces to optional I/O Expansion Modules (TCX 850, 851, 853, 855 only)
Three-position barrier strip
Male Spade (.250)
Male Spade (.250)
Infinet Bus:
Three-position, removable terminal strip
Andover Controls Corporation
World Headquarters
300 Brickstone Square
Andover, Massachusetts 01810 USA
Tel: 978 470 0555 • Fax: 978 470 0946
Andover Controls Ltd.
Smisby Road
Leicestershire LE65 2UG England
Tel: 01530 417733 • Fax: 01530 415436
Andover Controls GmbH
Am Seerhein 8
D-78467 Konstanz, Germany
Tel: 07531 99370 • Fax: 07531 993710
Andover Controls S.A.
Immeuble Dolomites 2
58 Rue Roger Salengro
94126 Fontenay Sous
Bois Cedex, France
Tel: 331 53 99 16 16 • Fax: 331 53 99 16 15
Andover Controls Asia
Unit 1201-02, Phase I, Cheuk Nang Centre
9 Hillwood Road, Tsim Sha Tsui
Kowloon, Hong Kong
Tel: 852 2739 5497 • Fax: 852 2739 7350
Memory Size:
128K EPROM, 32K RAM, 128 Byte EEPROM
UL/CUL 916, 1076, 864 UUKL, FCC, CE
•UL-864, UUKL Compliance
Andover Controls Mexico
Insurgentes Sur 1722-501
Col. Florida
Mexico D.F. 01030, Mexico
Tel: 525 661 56 72 • Fax: 525 661 54 15
U.S. Patent #4591967
©2000 Andover Controls Corporation.
Data subject to change without notice.
Consult Andover Product Installation
Guides for exact installation instructions
and specifications.
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