Andover Controls TCX 850 Installation Guide
TCX 850
Installation Guide
Andover Controls Corporation i
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Version F
Reproduction or d istribution forbi dden.
Copyright 1997 by Andover Controls.
Subject to change without notice.
Order No. 30-3001-173
Copyright
1997
Andover Controls Corporation
300 Brickstone Square
Andover, Massachusetts 01810
All Rights Reserved.
Published by the Engineering Departm ent at Andover Controls Corporation.
IMPORTANT NOTICE
This product is subject to change without notice. This document does not constitute any warranty, express or implied. Andover Controls Corpor ation reserves the right to alte r cap ab ilities, performanc e, and pres e ntation of this
product at any time.
ii TCX 850 Installation Guide
Preface
The Andover Controls TCX 850 Installation Guide presents instru ctions for installing the TCX 850 on an Infinet network. It first presents
site preparation infor mation and then step-by-step ins ta llation
instructions.
Andover Controls Corporation iii
iv TCX 850 Installation Guide
Contents
Setting Up the TCX 850 Controller and Infinet
Site/System Setup Requirements .............................................................2
Controller Dimensions and Weight ...............................................3
Power Requirements ......................................................................3
Cable Limitations . ..... .... ... ..... .. ..... .... ... ...... . ..... .. ..... .... ... ...... . ....... .. .3
Lightning Protection ......................................................................4
Building Ground Requirements ..................................................... 4
Inspecting the Ground ....................................................................5
Environmental Requirem en ts ....... ......... .......... ......... ......... .......... ..5
Output Equipment Requirements ..................................................5
Input Circuit Specifications ...........................................................6
Special Factors for Thermistors .....................................................6
Air Flow Sensor Requirements ......................................................8
Laying Out the Site Setup ..............................................................8
Installing the TCX 850 .............................................................................9
Unpacking ........... ......... .......... ......... ......... .......... ......... .......... .........9
Parts Requir ed ................ .......... ......... .......... ......... .......... ......... .......9
Mounting ............. ......... .......... ......... ......... .......... ......... .......... .........9
Connecting the Battery ................................................................11
Connecting the AC Power ...........................................................1 1
Wiring the Infinet to the TCX 850 ........................ ....... ....... ....... .1 5
Wiring the Infinet to the Infinity CX 9000 ..................................15
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Wiring the Inputs .........................................................................16
Connecting the Air Flow Sensor ..................................................2 0
Wiring the Outputs ......................................................................27
Wiring Tristate Output .................................................................27
Wiring Form A Outputs ...............................................................27
Connecting Modules to the Expansion Port ................................28
Powering Up the TCX 850 .....................................................................2 9
Reset Button ............ .......... ......... .......... ......... .......... ......... ......... ...30
Setting the Air Flow Potentiometers ............................................30
Completing the Installation ..........................................................3 0
Connecting the Andover Controls Service Tool .................. ....... .3 0
vi TCX 850 Installation Gu ide
Figures
Figure 1. The Front of the TCX 850 . ... ....... ....... ..... ....... ....... ....... ....... .1 0
Figure 2. Locations of Screw Holes and Parts Inside TCX 850 ......... .1 2
Figure 3. Diagram of the TCX 853 Controller ....................................1 3
Figure 4. Metal Plate and Screw for AC Power Wire .........................14
Figure 5. Infinet Cable Wiring to FASTON Receptacles ....................15
Figure 6. Schematic of Input Wiring for Thermistor ..... ....... ....... ....... .1 8
Figure 7. Schematic of Wiring for Counter or Digital Input ...............18
Figure 8. Schematic of Wiring for Voltage Input ................................18
Figure 9. Schematic of Wiring for Current Input................................ 19
Figure 10. TCX 850—Connecting Tubes/Wiring Air
Flow Sensor in VAV Box (VAV Cooling Only) ................22
Figure 11. TCX 850—Connecting Tubes/Wiring Air Flow
Sensor in VAV Box (One Stage Electric Heat) ...................2 3
Figure 12. TCX 850—Connecting Tubes/Wiring Air Flow
Sensor in VAV Box (Two Stage Electric Heat) ...................24
Figure 13. TCX 850—Connecting Tubes/Wiring Air Flow Sensor in
VAV Box (One Stage Electric Heat and One Fan) ..............25
Figure 14. TCX 850—Connecting Tubes/Wiring Air Flow Sensor in
VAV Box (Two Stage Electric Heat and One Fan) .............26
Figure 15. Schematic of Tristate Output Wiring ...................................27
Figure 16. Schematic of Form A Output Wiring ...................................28
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Table 1. Wire Gauges and Corresponding Maximum
º
Runs for Sensing Temperatures Up to 70
F ..........................7
Table 2. Wire Gauges and Corresponding Maximum
Runs for Sensing Temperatures Up to 100
º
Table 3. Wire Gauges and Corresponding Maximum
Runs for Sensing Temperatures Up to 150
º
Tables
F ........................7
F ........................8
viii TCX 850 Installation Guide
Setting Up the TCX 850
Controller and Infinet
This manual covers the following:
• Site/System Setup Requirement s
• Installing the TCX 850 or any controller in the TCX 850 family
All of the instructions in this manual referring to the TCX 850 apply
to the other TCX controllers, except those for the air flow sensor,
found only on the 850 model.
Warranty Registration
Your warranty is effective for 18 months starting on the date the system
is shipped.
Warning
All wiring and installations must comply with local, state, and national
electrical codes.
Hardware Instal lation
Site/System Setup Requirements
Before you proceed to install the system, you should map out where you
plan to install each controller, terminal/workstation, and modem. When
planning the sites, be aware of any electrical interference that may occur. You also need to be aware of cabinet dimensions, power
requirements, cable limitations, an d environm ental requir e ments .
Note
This equipment has been tested and found to comply with the limits for
a Class A digital device, pursuant to Part 15 of the FCC Rules. These
limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial
environment. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with the
instructions in this manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential area is
likely to cause harmful interference in which case the user will be
required to correct the interference at his own expense.
Note
This digital apparatus does not exceed the Class A limits for radio noise
emissions from digital apparatus set out in the Radio Interference
Regulations of the Canadian Department of Communications.
Avis
Le présent appareil numérique n’émet pas de bruits radioélectriq ues
dépassant les limites applicables aux appareils numériques de la class A
prescrites dans le Règlement sur le brouillage radioélectrique édicté par
le ministère des Communications du Canada.
2 TCX 850 Installation Guide
Hardware Installation
Controller Dimensions and Weight
Each TCX 850 is 9 × 5.75 × 2.75 in. and weighs 2.5 lbs.
Power Requirements
Caution
The TCX 850 should receive power from its own independent,
unswitched circuit.
The TCX 850 operates on a power supp ly of 24 VAC +/– 2 0% 5 0
or 60 Hz (fo r s moke control applicat ions, +10/ –1 5%, 60 Hz).
The TCX 850 consu mes 20 VA of power.
Cabl e Limitations
The maximum cable length for Infinet is 4,000 ft at 19,200 baud (up to
32 Infinet controllers). You can extend Infinet beyond 4,000 ft or put
more than 32 Infinet contr ollers on less than 4,00 0 ft by using the In-
fiLink 200 amplification module.
Note
You mu s t use s hie ld ed ca bl es f o r Infinet to ensure compliance with the
Class A FCC limits and to provide reliable communications.
Cables that form Infinet are 24-gauge, single-t wis ted-pair , tin ned,
shielded copper wire. Use the following cables1 or their equivalents:
• Brand Rex # H 9002 (single-pair)
• Anixter # 9J2401021 (single-pair plenum cable)
The cable should have a nominal impedance of 100 Ohms and a
nominal velocity of propagation of 78%.
1. You can also use any cables you may already have in place for ACNET or LBU.
TCX 850 Installation Guide 3
Capacitance of Infinet cable should be nominal, below 12.5 pF/ft between conductors and below 22 pF/ft between the conductor connected
to ground and the next conductor.
Lightning Protection
Each TCX 850 has two 1500 V spark gap capacitors and a metal oxide
varistor built into the board to protect against line transients. However,
this protection is not sufficient to pro tect against lig htning.
Lightning arresters are required at each point where Infinet cable enters
or exits a building. Use the following arrester:
Two pair gas tube arrester, Andover Controls # 01-2100-299
Building Ground Requirements
Hardware Instal lation
Warning
Be sure that all Infi nity products from Ando ver Controls Corporation
are grounded to true earth ground. This kind of ground protects the
equipment from transients and other power surges in the area.
We cannot guarantee that the controller system will operate as
documented unless you properly grou nd all control lers .
Warning
Be sure to have your grounds inspected before you begin the
installation process to be sure your municipality follows the National
Electrical Code. M a ny muni ci palitie s do not an d often have
substandard electrical grounds.
An example of a substandard ground is a galvanized steel cold water
pipe. As the pipe corrodes, it does not act as a true ground. The corrosion acts as an insulator, raising the potential of the pipe with respect to
the ground.
4 TCX 850 Installation Guide
Hardware Installation
When lightning strikes in the area of the ins talla tion, it drastically
changes the potential of the earth. Since properly grounded Andover
Controls units respond to changes in potential more rapidly than poorly
grounded electrical systems, a poorly grounded buildi ng tries to reach
ground through the Andover Controls system. The surge of current can
destroy electronic components on the controller board.
Surges of much lower potential than lightning also impact the reliability
of Andover Controls equipment.
Inspecting the Ground
You can check your ground as follows:
1. Check your ground by first inspectin g the building power
distribution panel for earth ground termination. If the ground
termination is any of the following, it is not adequate and must be
corrected:
• Does not exist.
• Is connected to a corroded or galvanized pipe.
• Is connected using a small gauge wire (less than 14 AWG).
2. Be sure your Andover Controls cabinet is connected to the ground
with a copper conductor that terminates at the distribution panel.
Environmental Requirements
The TCX 850 operates in rooms with temperatures ranging from 32 to
120°F and with humidity up to 85%, non-condensing.
The controller must be in an Underwriter Laboratories listed enclosure.
Output Equipment Requirements
The four outputs on the TCX 850 provide direct digital control for electronic devices and bi-directional motors and actuators . The first three
outputs are Form A (single pole, single throw) and the fourth is Form K
tristate.
TCX 850 Installation Guide 5
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