TCX 865. TCX 865 VAV Controller Family Installation Guide. Technical Manuals Online! - Controlling Tomorrow s World

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1 Controlling Tomorrow s World TCX 865 TCX 865 VAV Controller Family Installation Guide Version D

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3 Version D Reproduction or distribution forbidden. Copyright 1997 by Andover Controls. Subject to change without notice. Order No Copyright 1997 Andover Controls Corporation 300 Brickstone Square Andover, Massachusetts USA All Rights Reserved. Published by the Engineering Department 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 Corporation reserves the right to alter capabilities, performance, and presentation of this product at any time. TCX 865 Installation Guide i

4 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 radioélectriques 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. ii Andover Controls Corporation

5 Contents TCX 865 Series VAV Controller TCX 86X Series Characteristics...2 What You Received...2 Parts Included with the TCX 86X Series...2 Mechanical Installation...3 Chassis Road Map...5 Power Connection...6 Battery Connection & Replacement VAC Connection...7 Building Ground Requirements...8 Inspecting the Ground...8 Lightning Protection...8 Infinet Network Connection...9 Input Connections...10 Universal Inputs...10 Input Wiring...10 Wiring Concerns...11 Thermistor Inputs...11 Voltage Inputs...14 Digital/Counter Inputs...14 Air Flow Sensor Connection...15 Output Connections...16 Output Wiring...16 TCX 866 Analog Output Wiring...16 Switching Loads with Triacs...17 Form A Outputs...17 Form K Tri-state Outputs...17 Analog Outputs...18 Operation...19 TCX 865 Installation Guide iii

6 Service Tool...20 Pre-Operation Checks...20 Initial Power-Up...20 Troubleshooting...21 CPU LED Is Not Blinking...21 Unit Appears Functional But Is Not Responding To CX Controller...21 One Input or Output Appears to Be Dysfunctional...22 Internal Reset Switch...22 Sample Applications...23 iv Andover Controls Corporation

7 TCX 865 VAV Controller This manual describes the installation and care of the TCX 865 Series VAV control units. The Infinity TCX 865 Series VAV controllers are unique VAV box controllers that come equipped with a built-in damper actuator to streamline hardware installation. The TCX 865 series features several combinations of universal inputs, an on-board pressure transducer, Form A, and Tri-state outputs for flexible control configurations. Metal oxide varistors and optocouplers provide 2500V isolation on each triac-based output on thetcx 865 models to ensure noise-free operation and virtually eliminate the need to install MOVs in the field. The Infinet s true peer-to-peer communications protocol provides the Infinity TCX 865 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 865 series controllers can be networked to one CX series network controller. TCX 865 Family Installation Guide 1

8 TCX 865 Series Characteristics The following table lists the features included in the TCX 865: Model Outputs Inputs Special TCX Form A Triac outputs 2 Universal Inputs Damper Actuator or 1Form K Tri-state output Airflow sensor (0-1 W.C.) RTC* and 1 Form A Triac output TCX Form A Triac outputs 3 Universal Inputs Damper Actuator or 1Form K Tri-state output Smart Sensor Input RTC* and 1 Form A Triac output 2 Analog outputs Airflow sensor (0-1 W.C.) * RTC: Hardware-based, battery-maintained real time clock. What You Received After unpacking the unit, take care to not damage the packaging material you must reuse it if you ship the product back for repair. Parts Included with the TCX 865 Series TCX 86X Controller 5-micron Ramay Filter Hardware Reference Manual (this document) 2 Andover Controls Corporation

9 Mechanical Installation The TCX 865 Series is designed to be mounted directly to the shaft of an air handler. The shaft is inserted through the opening in the controller and secured using a U-bolt. Note: The unit requires that the VAV blade shaft be at least 1.5 (38 mm) in length and 1/4-5/8 (6-16 mm) in diameter (1/4-7/16 (6-11 mm) square) for proper mounting.the unit may be mounted in any orientation. Attach the TCX 86X to the air handling unit using the procedure outlined below: 1. Center the movable grommet in its mounting trough as illustrated: Center the Grommet 2. Loosen the nuts that attach the mounting U-bolt to the actuator motor. Manual override button U-bolt clamp with nuts 3. Manually, position the damper blade at its fully closed position. 4. With the manual override button depressed, rotate the actuator clamp of the TCX 86X motor counter clockwise to approximately 1/16-1/8 between the actuator stop and clamp, depending on seal design. TCX 865 Family Installation Guide 3

10 5. Position the unit at the proper perspective on the VAV box. Carefully insert the shaft of the VAV unit into the opening of the actuator motor through the U-bolt. Make sure the TCX 86X is flush with the VAV housing. Finger tighten the nuts to secure the shaft to the actuator. 6. Insert the supplied self-tapping screw through the grommet and secure the TCX 86X to the housing. Self-tapping screw secures the unit to the housing Shaft inserted into the actuator. 7. Tighten the U-Bolt to the shaft using an 8 mm wrench. Overall Dimensions The TCX 865 Series are designed to fit over an existing VAV shaft and be mounted to the housing. It is secured via one sheet metal screw. The overall dimensions of the unit are: 4 Andover Controls Corporation

11 Chassis Road Map The following diagram indicates the locations of each of the main components and connection points: Infinet Connection Airflow Sensor Damper Actuator CPU LED Digital Outputs 24VAC Power Damper Reset Button Universal Inputs AnalogOutputs & Other Inputs (under removable cover) TCX 865 Family Installation Guide 5

12 Power Connections Power Connection The TCX 865 Series Controllers are operated via an individual external 24 Volt AC source. An internal power converter creates the necessary DC voltages to supply the microprocessor circuitry. Should the AC source be interrupted during operation, backup power for the internal controller state memory is provided by a coin-style 3 Volt Lithium battery. This battery can maintain backup status for typically 3-years. Battery Connection & Replacement To access the battery holder, the main electronics housing cover must be removed. The cover is secured via two force fitting plastic clamps. To remove the cover gently pry the two clamps outward using your thumbs while lifting the cover. Once the cover is removed the printed circuit board is accessible. The following illustrates the location of the battery in relation to the board. Battery is located here. During shipment, an insulating plastic tab is inserted under the clip on the battery to prevent it from draining prior to installation. To activate the battery, this tab must be removed. Should it become necessary to replace the battery, The battery is placed in a coin-style holder. The battery used in the TCX865 Series are a type CR 1225, 38 mahr 3.0 V primary Lithium battery. CAUTION There is danger of explosion if the battery is incorrectly replaced. Replace only with the same or equivalent type recommended above. Dispose of used batteries according to manufacturer s instructions. 6 Andover Controls Corporation

13 Power Connections 24 VAC Connection The TCX 865 Series controllers are powered by an external 24 VAC source. This power supply is connected via three terminals located near the center of the I/O connection area. The unit should receive power from its own independent, 24 VAC +10% / 15%, 50 or 60 Hz, 10 VA, unswitched circuit. AC Line Power Optional 39V Varistor for extremely noisy environments 24 VAC Step-Down Transformer X1 X2 Black White or Green OUT 4 OUT 5 24VAC GND Optional Varistor choose a voltage rating appropriate to the input voltage applied. i.e 130V or 250V The 24 VAC connection consists of both terminals from the secondary of a power-line to 24 VAC transformer and a common ground line. Connection to the Controller is through push-on quick-disconnect type connectors. The ground wire should not exceed 12 in length and it must be connected to a good earth ground. Warning Make sure that 24 VAC is not connected to the power cable while you are wiring the controller, or you could receive an electrical shock that is life-threatening. TCX 865 Family Installation Guide 7

14 Power Connections Building Ground Requirements Be sure that all equipment from Andover Controls is grounded to true Earth ground. True Earth ground protects the equipment from transients and other power surges in the area. We cannot guarantee that the controller system will operate as documented without a properly grounded installation. An example of a sub-standard 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. When lightning strikes in the area of the installation, 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 building 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 the equipment. Inspecting the Ground Be sure to have your grounds inspected before you begin the installation process to be sure your municipality follows the National Electrical Code. Many municipalities do not follow the code and often have substandard electrical grounds. Check your ground as follows: Inspect 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). Be sure your Andover Controls cabinet is connected to the ground with a copper conductor that terminates at the distribution panel. Lightning Protection Although metal oxide varistors are built into the board to protect against power line transients, this protection is not sufficient to protect against lightning. Lightning arresters are required at each point where Infinet cables enter or exit a building. The following lightning arrester is recommended: Andover Controls # , Two pair gas tube lightning arrester 8 Andover Controls Corporation

15 Infinet Connections Infinet Network Connection The TCX 865 Series controllers include an interface to the Andover Controls proprietary Infinet network. Connection to the Infinet allows multiple controllers to communicate and be controlled by a larger host controller. Connection to the Infinet requires access to an Infinet network cable. This cable consists of two wires and a shield. A screw-type terminal block Infinet connector is provided on the printed circuit board. Connect the Infinet Here. To wire the Controller to the Infinet, follow the steps below: 8. Trim the outer jacket of the Infinet cable to reveal the internal wires. 9. Strip the insulation from the white* wire and loosen the screw labeled Insert the stripped end of the white* wire into the + receptacle of the terminal block. Tighten the screw. 11. Strip the insulation from the black* wire and loosen the screw labeled Insert the stripped end of the black* wire into the - receptacle of the terminal block. Tighten the screw. 13. Insert the shield wire into the SHIELD receptacle of the terminal block. Tighten the screw. * Wire colors are included for clarity. The colors of your cable may vary. However, make sure that all Infinet connections are consistent on their connections. Infinet Cables. Black White + - SHLD OUT 3 Shield White TCX 865 Family Installation Guide 9

16 Input Connections Input Connections Universal Inputs The TCX 865 Series controllers include Andover Controls Universal Inputs that are unique in that they are software configurable to handle any one of a number of input types: Thermistor Voltage Digital/Counter Input Wiring The actual input terminations are located as shown. Connection is via a (6.35 mm) male spade lug. Connect Inputs 1 and 2 Here IN1 IN2 RET The inputs labeled IN1,and IN2 are followed by a connection labeled RET for the input signal return. Although there is only one return terminal (RET) supplied, it is recommended that a separate return wire be used for each input. All return wires should be crimped into one female spade lug for connection to the RET terminal. TCX 866 Inputs labeled IN3,and IN4 are found on the screw terminal strip at the top right of the daughter board mounted over the main PC board under the removable plastic cover. To remove the cover, simply pull outward on the two opposite tabs that lock the cover to the base and pull upward. IN3 is used for the Smart Sensor only. For more information regarding the Smart Sensor, refer to its installation manual. IN4 is followed by a connection labeled RET for the input signal return. A separate shield may be connected to the SHLD terminal. TCX 866 Extra Input Connections IN3 IN4 RET SHLD 10 Andover Controls Corporation

17 Input Connections Wiring Concerns Do not remotely ground any part of the sensor wiring. Remote grounds connected to the TCX 865 Series return terminal could make the controller operate incorrectly or damage the equipment. The signal return is not true earth ground. It is an electronic reference point necessary to interpret the sensor properly. It is recommended that you run input wiring in a conduit separate from AC power or output wiring and avoid long wiring runs. For reliable input operation, follow these input wiring guidelines: Never lay wires across the surface of the printed circuit board. Wires should never be within 1 in. or 25 mm of any component on the printed circuit board. Use shielded input wire. Terminate the shield of the input wires at one end of the run only preferably at the end where your controller is located. Be careful when stripping wire not to drop small pieces of wire inside the cabinet. Don t run your input wiring in the same conduit with AC power. Don t run your input wiring in the same conduit with your output wiring. Caution Do not externally ground any input connected to the Controller. This may damage the unit. Signal return terminals are not connected to Earth Ground. Thermistor Inputs The TCX 865 Series inputs may be configured to sense temperature by connecting a resistive thermistor to any one of the input terminals. The following is a schematic representation of the connection: One lead connects to the numbered input terminal, the other to a return terminal. INx Thermistor RET (return) Caution Never apply a voltage to a thermistor doing so alters the thermistor s accuracy and reliability. In fact, it s a good idea to replace any thermistor that has had any sort of voltage applied to it. TCX 865 Family Installation Guide 11

18 Input Connections Special Factors for Thermistors To keep thermistor errors minimal, limit the length of wire runs to the maximum for the gauge wire you select. The following three tables indicate the maximum length runs for wires of various gauges to keep errors within certain temperature limits when using thermistor elements. Gauge 1 / 2 F (.28 C) Error 1 / 4 F (.14 C) Error 1 / 10 F (.06 C) Error #14 26,700 ft 2.5 mm m #16 16,700 ft 1.5 mm m #18 10,500 ft 1.0 mm m #20 6,600 ft 0.5 mm m #22 4,100 ft 0.35 mm m 13,300 ft 4000 m 8,300 ft 2500 m 5,200 ft 1600 m 3,300 ft 1000 m 2,000 ft 600 m 5,300 ft 1600 m 3,300 ft 1000 m 2,100 ft 640 m 1,300 ft 400 m 800 ft 250 m Wire Gauges and Corresponding Maximum Runs for Sensing Temperatures Up to 70 F (21 C) Gauge 1 / 2 F (.28 C) Error 1 / 4 F (.14 C) Error 1 / 10 F (.06 C) Error #14 12,600 ft 2.5 mm m #16 7,900 ft 1.5 mm m #18 5,000 ft 1.0 mm m #20 3,100 ft 0.5 mm m #22 1,900 ft 0.35 mm m 6,300 ft 1900 m 3,900 ft 1200 m 2,500 ft 760 m 1,500 ft 450 m 900 ft 275 m 2,500 ft 760 m 1,500 ft 450 m 1,000 ft 300 m 600 ft 180 m 300 ft 90 m Wire Gauges and Corresponding Maximum Runs for Sensing Temperatures Up to 100 F (38 C) 12 Andover Controls Corporation

19 Input Connections Gauge 1 / 2 F (.28 C) Error 1 / 4 F (.14 C) Error 1 / 10 F (.06 C) Error #14 4,100 ft 2.5 mm m #16 2,600 ft 1.5 mm m #18 1,600 ft 1.0 mm m #20 1,000 ft 0.5 mm m # ft 0.35 mm m 2,000 ft 600 m 1,300 ft 400 m 800 ft 240 m 500 ft 150 m 300 ft 90 m 800 ft 240 m 500 ft 150 m 300 ft 90 m 200 ft 60 m 100 ft 30 m Wire Gauges and Corresponding Maximum Runs for Sensing Temperatures Up to 150 F (65 C) Thermistor Input Specifications Range 30 to 230 F ( 34 to 110 C) Accuracy (Using an Andover Controls Thermistor) +/ 1 F over a 10 F to 150 F range +/ 0.55 C over a 23.3 to 65.5 C range TCX 865 Family Installation Guide 13

20 Input Connections Voltage Inputs The TCX 865 Series inputs may be configured to sense voltage by connecting the input terminals to a voltage source. The following is a schematic representation of the connection: One lead connects to the numbered input terminal, the other to a return terminal. + - V INx RET (return) Voltage Input Specifications Voltage Range Resolution Accuracy Input Impedance Filtering Calibration 0 to V V +/ V 10KΩ referenced to V Corner Frequency at 15 Hz, 20 db/decade Permanent (factory) Digital/Counter Inputs The TCX 865 Series inputs may be configured to sense a contact closure by connecting the input terminals to a digital or counter input source. The following is a schematic representation of the connection: One lead connects to the numbered input terminal, the other to a return terminal. INx RET (return) Digital/Counter Input Specifications Input Type Contact Closure Maximum Pulse Frequency 4 Hz at a duty cycle of 50% Pulse Width 125 ms minimum 14 Andover Controls Corporation

21 Air Flow Sensor Connections Air Flow Sensor Connection All models of the TCX 865 Series controllers include an airflow sensor. The air flow sensor is located at the top of the controller chassis: Filter Side marked IN Here CPU IN (HIGH) AIRFLOW INPUT OUT (LOW) The following steps explain the connection of the air flow sensor: 1. Using a small piece of 1/4 (6.35 mm) I.D. pneumatic tubing, attach the OUT side of a 5 micron filter to the input connection (the side marked IN ) of the sensor as shown above. 2. Connect a 1/4 I.D. pneumatic tube from the other end of the filter (the side marked IN ) to the HI opening on a VAV box. 3. Connect a 1/4 I.D. pneumatic tube from the output connector (the side marked OUT ) of the air flow sensor to the LO opening on a VAV box. Note: Keep tubing to a maximum of 15 inches ( mm) in length. Air Flow Input Specifications Range Resolution Accuracy 0 to 1 WC (0-249 Pa) WC ( F (23 Standard Air Conditions +/ 0.05 WC ( F (23 Standard Air Conditions TCX 865 Family Installation Guide 15

22 Output Connections Output Connections The TCX 865 Series controllers include 3 Form A Triacs that can be used separately or be configured into 1 Form K Tri-state output with a free triac output remaining. TCX 866 controllers include 2 analog outputs. Output Wiring Triac output terminations are located along the left side of the chassis. Connection is via a (6.35 mm) male spade lug. Connect Triac Outputs Here TCX 866 analog output terminations are found on the screw terminal strip at the top right of the daughter board mounted over the main PC board under the removable plastic cover. To remove the cover, simply pull outward on the two opposite tabs that lock the cover to the base and pull upward. Corresponding signal returns labeled RET are provided to either side of the output terminals. A separate shield input is provided as well. TCX 866 Analog Output Connections RET OUT6 OUT7 RET SHLD 16 Andover Controls Corporation

23 Output Connections Switching Loads with Triacs Although the Triac-based outputs provided with this unit appear as relay contacts in the schematics provided, they are actually solid-state switches that have limitations on the loads they can switch. AC vs. DC The first limitation is that they cannot be used with DC loads. A Triac switches AC only. Minimum Load Current The second limitation involves the minimum load current. In order for the Triac to switch it must detect at least 30 ma of current from the load. If your load is less than 30 ma you can induce the required load by connecting a resistor across the load (not directly at the Triac!). Check the current draw specification on your field device, and if it does not meet this minimum, add a resistor in parallel with the device being driven sized to achieve the minimum loading. Use the following formulas to determine resistance and wattage: Resistance (ohms) =Voltage Power (Watts) = (Voltage) 2 Current Resistance Form A Triac Outputs The TCX 865 Series includes three Form A Triac outputs. The following is a functional schematic representation of the connection: C NO When the output is activated, the connection between the C and NO terminals becomes a virtual short circuit. Using the Form A connection you can control anything that would normally be controlled (within specifications) via a switch or relay contact closure. Form K Tri-state Outputs Two Form A triac outputs can be connected to provide one Form K Tri-state output. OUT3 and OUT4 or OUT4 and OUT5 can be configured as a tristate output. The following is a schematic representation and the actual wiring of the connection: C +ON ON OUT 4 OUT 3 ON C +ON TCX 865 Family Installation Guide 17

24 Output Connections Note that all tristate outputs fail in the OFF state if there is no power. They are forced to the OFF position for 2 minutes upon reset or powerup before being program controlled. Form A and Form K Output Specifications Current 0.5 C Resolution 0.1 sec for PWM TCX 866 Analog Outputs The TCX 866 includes two 0-10 V Analog outputs on the internal daughterboard. The following is a schematic representation and the actual wiring of the connection: OUTx RET (return) R L >= 2K + Load Analog Output Specifications Range Resolution Accuracy Current 0 to V 0.05 V +/ 0.10 V 5 ma maximum 18 Andover Controls Corporation

25 Operation Operation The TCX 865 Series controllers are designed to be programmed by an external source. Therefore, programmers should refer to the Programmer s Guide for their particular controller or the SX 8000 Programmer s Guide for specific information regarding configuration of input and output points. I/O Point Assignments The TCX 865 Series can be programmed using the following point assignments: Function Point Function Input Point Assignment Electrical Type TCX 865 TCX 866 Universal Input * see note 1 Universal Input * see note Universal Input 4-4 * see note 1 Airflow Sensor Input 7 7 Voltage Function Output Point Assignment Electrical Type TCX 865 TCX 866 Actuator 1 1 Tri-State Output Digital, Tri-State Output Digital Output Digital Output 6-6 Analog (Voltage only) Output 7-7 Analog (Voltage only) * Note 1: valid E-Types are Analog Voltage ACC_TEMP_DEGF ACC_TEMP_DEGC Digital Counter Actuator Programming & Use The actuator motor provided in the TCX 865 Series units are controlled by sending a pulse (positive or negative) to the output that corresponds to the desired position of the damper blade. The minimum pulse width is 1 second. Note: Whenever the manual override button is pressed and the actuator is moved manually it is necessary that you press the Damper Reset push button. Caution Be sure that the actuator has come to a full stop before changing directions. TCX 865 Family Installation Guide 19

26 Operation Service Tool Access is provided to the controller via the Andover Controls lap-top service tool. A special port is provided behind the Infinet connector inside the plastic cover where a service tool adapter cable may be wired. This adapter cable converts the separate wires connected to the TCX unit into the standard RJ11 connector used by the service tool. Connection of the service port adapter cable is through a 4-pin Berg-type connector. Pre-Operation Checks 1 Make sure the internal battery is present or the external battery is connected. 2. Make sure the 24VAC power is wired properly. Check to be sure that both wires have been connected. 3. Make sure the controller has a true earth ground. 4. Make sure you have used the proper cables and wires at correct lengths. 5. Make sure the Infinet cables and shields has been properly wired. Initial Power-Up 1 Enable the AC power source (or close the power connection). The controller starts automatically. If the controller has been off, outputs remain off. If you have pressed the internal RESET button, outputs turn off. 2. The CPU light flashes every quarter second. There is a distinguishable off time. 3. If the CPU light flashes very fast (no distinguishable off time), the CPU has failed an internal test. In this case, recheck your connections and contact your Andover Controls representative. 4. Press the Damper Reset pushbutton (see diagram below). This tells the controller that the actuator has been moved manually. Damper Reset Button 20 Andover Controls Corporation

27 Troubleshooting Troubleshooting With any electronic device it is possible that the unit may enter a confused or non-operational state depending upon unexpected outside stimulus. The following is a guide to follow should you decide the unit is not functioning properly: CPU LED Is Not Blinking If the CPU LED is not blinking then the unit is not operating. This could be due to the loss of primary AC power or other internal disfunction. Check that 24VAC is available and connected properly to the power terminals. This can be done using a multimeter reading the voltage across the 24V HOT and GND terminals. 2 Amp, 125V picofuse If power appears to be OK, remove power and all other connections from the unit. Open the plastic electronics cover. Remove the plug-in power fuse component and check it for continuity with an Ohm meter. If the fuse is blown, replace it with a similar 2 Amp picofuse (it resides in a socket). After replacement, take care that the board is reinserted into the chassis properly before re-mounting the cover. Unit Appears Functional But Is Not Responding To CX Controller If the CPU LED is blinking normally chances are that the unit is operational. However, in that the TCX 86X is a programmable unit, it is possible that there is a programming problem. Try attaching an Andover Controls Lap-Top Service Tool to determine the source of the problem. Monitoring Infinet Activity Infinet communications can be monitored simply by observing the status of two miniature LED indicators mounted on the board just behind the Infinet connector as indicated on the drawing on the following page. During Infinet communications, both of these LEDs should show activity. TCX 865 Family Installation Guide 21

28 Troubleshooting One Input or Output Appears to Be Dysfunctional If the CPU LED is operating and other inputs/outputs are operating properly there could be two reasons for the failure: The Input or Output has been damaged. In this case contact an Andover Controls representative for assistance. If this is the first time using the controller, perhaps the program controlling the input/output is not correct. Re-check your program. Internal Reset Switch Should the controller appear to be non responsive and all other attempts to revive it fail, try pressing the internal reset switch. The switch is located on the board behind the cover as shown below: Infinet Activity monitor LEDs Internal RESET switch * These varistors would be added only in very noisy environments. 22 Andover Controls Corporation

29 Sample Applications Sample Applications The following two illustrations detail the connections to a simple VAV Box. The first application is a cooling-only scenario. It shows the connections for the Air Flow sensor and the 24VAC Power Source. External varistors are shown in appropriate locations. IN Ramay Filter LO HI IN OUT HOT GND TCX 86X Optional Varistors See Note* X1 X2 24VAC Step Down Transformer TCX 865 Family Installation Guide 23

30 Sample Applications IN Ramay Filter LO HI IN OUT OUT 5 HOT GND TCX 86X TCX 866 Optional Varistors See Note* 24VAC Step Down Transformer The second application shows a VAV Box with re-heating capability. A single output controls the relay that activates the heating unit * These varistors would be added only in very noisy environments. 24 Andover Controls Corporation

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32 Version D