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Unitary Controller (UNT) - Johnson Controls

1. Ziv a ziv WOIV mmm LM WOW LE LIV Diagram is for UNT110 111 and Note UNT110 111 is shown in illustration UNT120 121 Figure 10 UNT110 111 and UNT120 121 Terminal Designations 26 UNT Controller Unitary Controller UNT Table 7 UNT110 111 and UNT120 121 Terminal Identification v ______ COMMON AOCM 7 1 Binary Output 7 AO Common Analog Output 1 Common 2 Binary Output 8 AO Common Analog Output 2 UNT Controller Unitary Controller UNT 27 ELEISON CONTRELS LOW HIGH NY 000 mee ud C SWITCHING L hy zone O oTa Egs lt STAT Za 598 122 ZBUS 598 Gay Gi i SS 1 RTN BOS RTN BOS BOT UNT140 BO6 BO7 RTN BO8 A A A 15 24 24 All Al2 AI3 14 AIS AIS yac BI2 BI3 jag BOTRTN BO2 RTN REF 2 2 CY CSC YC CS CS CWCY BO Triac Jumper Connector an COM 2 AIS dO 2 B ic 14 NS RTN Bg
2. 15 000 ohms e NNN 00 M100J 1 for Return 10 4 8 1 p Air Damper 120 24 VAC Power Transformer Z y T 858 120 24 VAC Power M100J Transformer _ 4 for Exhaust Air Damper untm100e Figure 18 R81EAA 2 UNT Controller Interface UNT Controller Unitary Controller UNT 39 HE 6300 Humidity Perform the following steps to connect an HE 6300 Humidity Sensor to Sensor the UNT see Figure 19 1 Set the analog input DIP switches on the AS UNTxxx board to 10 volts Switch 1 OFF Switch 2 ON 2 Enter the range of the humidity sensor through HV AC PRO for Windows 0 to 10 VDC is equal to 0 to 100 RH Analog Input DIP Switch Setting sw2 SW1 S BINARY IN A BINARY OUTPUTS FERAI PWT unthe HE Ewe Huy Sensor Figure 19 Example of HE 6300 Humidity Sensor Connection 40 UNT Controller Unitary Controller UNT Temperature Sensors CESON CONTRELS CBLPRO 9 or 25 pin Adapter 2 amp ez 2 Laptop Zone 6 to 8 pin HA or Zone Terminal CBLPRO 9 pin or25 pin 8 pin Adapter 5 to g 8 pin Laptop PC Zone Bus 6 pin to 6 pin
3. z NO AS RLY050 0 AS RLY002 0 unt2ahu Note 1 Separate low voltage wiring on the left from line voltage wiring on the right Note 2 Hand operation using the H O A switch requires common to the COILS terminal and 24 VAC to the TRIAC terminal to energize the relay Note 3 The Hand or Off position signals the binary input connected to those terminals These switches can be hardwire OR ed and connected to one BI This switch uses the HOA COM terminal which is isolated from the relays Note 4 Your application will determine exact connections to UNT Figure 16 UNT110 111 Wired to RLY050 002 with Isolated BOs 36 UNT Controller Unitary Controller UNT Wiring Sensors and Actuators You can obtain a Double Pole Double Throw DPDT relay configuration by connecting the BO signal to two terminals on the relay kit terminal block e g B and C If you require a phone jack at a remote relay kit add AS CBLCON O For additional information refer to the grounding and isolation information in the Wiring Details section of this technical bulletin Use 18 AWG twisted pair wire for all sensor and output wiring Shielding is not required However if you decide to use it earth ground the shield at the transformer You may also use 24 AWG wire in some applications but maximum wire length will be reduced due to the increased resistance To minimize sensor error caused by field wiring the total
4. N t Y NV P P ln In o HHIH S HHH ONS Wh d x t c COO RS te 3 HH R m m Metal Barrier Y2 iN UNT Figure 39 UNT Directly Driving Loads 86 UNT Controller Unitary Controller UNT 7777 i 22 AN BH Ls CN e MN D NS ie 9 p n n 2 3 4 2 M RB IR t 3 S Metal Barrier Metal Barrier gt a 2 2 3 3 5 3 3 3 Load I Ns UNT Figure 40 UNT with Pilot Relays UNT Controller Unitary Controller UNT 87 Considerations The following information should be taken into consideration for specific for Specific rooftop units Rooftop Units 1 Lennox GCS16 Series Rooftop Units For Lennox 16 series rooftop units bypass the K25 blower fan delay relay TDR by disconnecting the K25 coil power wire Lennox provides K25 blower control for use with electromechanical thermostats The reason for disconnecting this when a UNT provides the blower control functions is that the K25 causes unnecessary contactor cycling This creates additional electrical noise On some Lennox models it may also cause blowe
5. Go to the Network Map on the Operator Workstation OWS Double click the system name to which the new UNT object is to be Select Type N2 devices in the Item New dialog box itemnew Figure 2 Item New Dialog Box Note The Hardware System and Hardware Object text fields are not used for this object type UNT Controller Unitary Controller UNT 7 6 Highlight UNT in the Add N2 Device dialog box as shown in Figure 3 Hardware Add N2 Device OK Device Type AHU 060 DCM DR9100 DX9100 IFC 2020 LCP n2dve Figure 3 Add N2 Device Dialog Box 7 Click OK 8 Complete the attribute fields in the UNT Definition window see Figure 4 UNT Definition Edit View Action Go To Accessory Tower 1 Floor 1 Bookmark Hardware Comm Disabled Hardware Flags N2 Trunk Number Auto Dialout N2 Device Address Poll Priority windobj Figure 4 UNT Control Device Object Definition Window Note Fill in the blank UNT Definition attribute fields as required Specify an N2 Device Address from 1 to 255 Default values in the remaining attribute fields may be accepted or changed 8 UNT Controller Unitary Controller UNT Defining a UNT Control Device in Companion Software Table 3 explains the blank attribute fields The Operator Workstation U
6. IMPORTANT When setting the N2 Address do not use Address 0 Set the N2 address and test for N2 voltage polarity and isolation before actually wiring the UNT for operation The factory default address is 3 The switches located in the upper right corner of the UNT must be set to the same number as the software assigned to the module The Metasys or Companion Facility Management System FMS uses this address for polling and commanding The numbers are in binary format and horizontally arranged with the least significant digit on the right For example if the controller address is 17 decimal the binary representation is 00010001 Switches 1 and 16 must be set to the on position 1 16 17 as shown in Figure 23 If you change the address while the UNT is online you must cycle power for the network to recognize the new address J amp HNSON CONTRELS METASYS 123456 Address Switches BINARY OUTPUTS Figure 23 Setting the N2 Address DIP Switches 46 UNT Controller Unitary Controller UNT N2 Wiring to the Network Control Module NCU TB1 on Communication Terminal Board 8 nee Note Since the UNT is a self terminating device end of line termination for the N2 Bus is not required n2wire a Figure 24 Connecting the UNT Controller to an NCM Table 14 Term
7. the Zone Terminal tab Zone Terminal Technical Bulletin LIT 6363014 for proper cabling between the ZT ASC and CBLCON 50 UNT Controller Unitary Controller UNT Fan Coil Applications Application Examples All of the following examples were created by answering configuration questions using HVAC PRO for Windows to identify terminal locations of the inputs and outputs Refer to the HVAC PRO for Windows User s Manual FAN 637 5 the UNT Controller section for detailed information regarding controller configuration The UNT110 111 series controller was used in all examples Table 18 Fan Coil Parameters and Configuration Selections Configuration Selections Common Heating Cooling Coil HVAC PRO for Windows Parameters Heating Type Yes Lighting Integration Return Air Discharge Air Figure 26 Fan Coil Mechanical Flow Diagram UNT Controller Unitary Controller UNT 51 Transtormer g RM SP 120 24 VAC TE1 120 VAC Power 24 RM T ANALOG INPUTS BINARY OUTPUTS ANALOG PIT 1011 41111 1111 om VA1 2 canna R1 Lighting Relay fcwire Figure 27 Fan Coil Wiring Example Bill of Materials Table 19 Fan Coil of Mate
8. N f A BO6 BO7 RTN BO8 7 AL e lt iL gt 5 E uaa m zz UNT141 OR oc N A A A 15 24 Al 6 vpe vac scrtrm2 Figure 11 UNT140 141 Terminal Designations 28 UNT Controller Unitary Controller UNT Table 8 UNT140 141 Terminal Identification as Noui SSCS ________ a4 Agua _________ Aekghu m Bmymui Return 24 VAC or Common or Analog Output Common Common Transformer Low Side zBus S O Ne Depends on triac switching jumper setting If high return is Common If low return is 24 VAC UNT Controller Unitary Controller UNT 29 Analog Inputs The six analog input terminals their power supply and their common points occupy the lower left corner of the terminal strip These inputs may be of two types resistive or voltage The UNT processes and controls the configured control strategy It reads the analog inputs through the analog input DIP switches located directly above the analog input terminals Use these switches and HVAC PRO for Windows to select the type of analog input Use the T position for all temperature sensors and setpoint potentiometers Use the V position for all active voltage transmitters For humidity applications using 3 wire voltage transmitters such as the HE 6300
9. Note that in this case you do not need a relay on every BO unless isolating noise with relays see the Important preceding this one e You must use a line filter between the binary output of the UNT and the control input of the ignition device for direct spark ignition systems Many pilot ignition systems do not require this filtering However we recommend its use if you are not familiar with your rooftop unit s particular ignition device Pilot ignition devices light small pilot flames and generate small amounts of electrical noise Direct ignition devices generate large amounts of noise by creating hot sparks with enough energy to ignite main gas valve burners e You must also filter any wires connected to the gas valves that you route with other wires leaving the gas heating section An individual line filter can filter two wires but it is acceptable to use only half of it if you need to filter a single wire Mount the filters on the metal wall between the ignition chamber and the fan chamber We recommend the filters listed in Table 40 Table 40 Recommended Filters ava 8174542 152439 Note These filters all rated 3A 120 250V and are available from Newark Electronics These models are specified for derating with an unbalanced load No other models are authorized e You must use a pilot relay to isolate the UNT binary output from any gas valve containing a full wave bridge rectifier The bridge rectifier causes
10. features of the different hardware sets Table 2 lists the differences by model UNT Controller Unitary Controller UNT 5 Table 1 Unitary Controller Hardware Characteristics Similarities Characteristic 6 Analog Inputs RTD temperature elements 1000 ohm nickel platinum or silicon Adjustable 0 to 2k ohm setpoint potentiometers 0 to 10 VDC or 0 to 2 VDC transmitters 4 Binary Inputs 4 24 VAC input only 24 VAC provided 1 Momentary pushbutton from Zone Sensor for temporary occupancy mode BI 5 BI 4 may be used as an accumulator input for frequencies less than 2 Hz Zone Bus Removable screw terminal block Light Emitting Diode LED Indication 8 pin phone jack see Table 2 on controller 24 VAC Power in Removable screw terminal block ISP TES N2 Terminations Removable screw terminal block Table 2 Unitary Controller Hardware Characteristics Differences Characteristic UNT110 1 UNT111 1 UNT120 1 UNT121 1 UNT140 1 UNT141 1 Operating 0 to 52 C 0 to 52 C 40 to 52 C 40 to 52 C 0 to 52 C 0 to 52 C Temperature 32 125 3210125 40to 125 40to 125 32to 125 F 32 to 1253 Rating Analog Outputs to 10 VDC 10mA Binary Outputs 24 VAC Triacs 0 5A or 0 8A if total power is limited Low or High side common selectable Zone Bus see Additional Additional Table 1 6 pin Phone 6 pin Phone Jack Jack Terminations i i i i Fixed Screw _ Fixed Screw Connects Connects Conne
11. 400 mA 25 VA for UNT120 121 due to heater Ambient Operating Conditions 0 to 52 C 32 to 125 F and 40 to 52 C 40 to 125 F for UNT12n 1 10 to 90 RH Ambient Storage Conditions 40 to 70 C 40 to 158 F 10 to 90 RH Dimensions 165 x 163 x 56 mm 6 5 x 6 4 x 2 2 in H x Wx D without enclosure ENC 173 x 185 x 119 mm 6 8 x 7 3 x 4 7 in with enclosure Shipping Weight 0 64 kg 1 4 Ib 800652 32 64K ROM 8K EEPROM Standards Compliance IEEE 472 IEEE 518 IEEE 587 Category A FCC Part 15 Subpart J Class A UL 916 UL 864 Agency Listings UL Listed and CSA Certified as part of the Metasys Network UNT Controller Unitary Controller UNT 77 78 UNT Controller Unitary Controller UNT Environmental Information Installation Requirements Appendix A Precautions for Rooftop Installations Mount the UNT within the rooftop unit or some other enclosure to protect it from rain snow etc We recommend venting for small enclosures in environments that regularly exceed 32 C 90 F The installation site of the UNT must meet the following environmental standards e The atmosphere must be free of explosive gases or corrosive chemical or salt vapors e The relative humidity noncondensing must be between 10 and 90 e temperature for the UNT110 111 series controllers must be between 0 and 52 C 32 and 125 F e The temperature for the UNT120 121 series contr
12. Damper to 10 VDC Actuator Spring Return 72 UNT Controller Unitary Controller UNT Accessories Vendor Code Numbers Table 31 UNT Accessories FASRLYOOO ______ Rey 2SPOT SA240VAG AS RLY050 0 Relay Kit 2 SPDT 5A 240 VAC with enclosure AS RLY100 1 Relay Kit 4 SPDT 5A 240 VAC with enclosure 0 Replacement N2 Bus and Five N2 Bus and Power Terminal Block Five Power Terminal Connectors Blocks EN EWC10 0 Enclosure for UNT optional UPM Plastic EN EWC15 0 Enclosure with 50 VA UPM with 50 VA Transformer TE 6001 961 Momentary Button Kit for N A Temporary Occupancy or Boost Modes for TE 6100 11 12 only MM CVT101 0 RS 232 RS 485 Converter for N A N2 Download Commissioning with HVAC PRO for Windows WS WINPRO 0 HVAC PRO for Windows N A Software WS WINPRO 6 HVAC PRO for Windows N A Software Upgrade Y65XX X Series Transformer 24 120 220 277 480 VAC to 24 VAC AS ZTU100 1 Zone Terminal N A Note The AS ZTU100 1 supports both AS UNTxxx 0 and AS UNTxxx 1 models The AS ZTU100 0 supports AS UNTxxx 0 models only Tables 32 and 33 list preconfigured cables and cable components available from Southwest Wire 5950 Office Blvd Albuquerque NM 87109 Phone 1 800 334 2150 Fax 505 344 3400 UNT Controller Unitary Controller UNT 73 Use Table 32 to order preconfigured cables from Southwest Wire Table 32 Preconfigured Cables Southwest Wire RJ45 Straight through 7 62 m 25 ft CBL STAT2
13. Metastat Figure 20 Example of Temperature Sensor Connection To make all necessary wiring terminations between the UNT and TE 6400 series Metastat use phone cable that has preterminated 8 pin RJ 45 connectors For cable ordering information refer to Vendor Code Numbers in the Ordering Information section of this technical bulletin Connect one end of the cable to the Zone Bus connector on the controller and the other end to the 8 pin connector on the back of the sensor as shown in Figure 20 In addition to the 8 pin RJ 45 connection the TE 6410 sensor also has a 6 pin RJ 12 connection under its cover This allows remote connection of the CBLPRO or the Zone Terminal used for system monitoring For UNT140 141 series controllers there is an additional 6 pin jack for Zone Bus communication You may permanently connect a Metastat to the 8 pin jack of the controller and simultaneously connect a laptop PC CBLPRO or Zone Terminal to the Zone Bus via the 6 pin jack UNT Controller Unitary Controller UNT 41 Phone Jack Figure 21 illustrates the polarization of the 6 pin and 8 pin phone jacks on Polarization the UNT or Metastat Terminal 1 is to the extreme left as you face the jack opening tab notch down Figure 21 Phone Jack Polarization The following table defines the pin usage for each jack Table 13 Phone Jack Pin Identification 8 Pin Jack UNT to Temperature 6 Pin Jack UNT140 Controller to Se
14. Mount the UNT in a convenient location using the predrilled mounting holes The controller must be mounted vertically on a wall or panel where it can be easily wired through the enclosure cover This also applies to remote location packages UNT Controller Unitary Controller UNT 13 Do not use this knockout Otherwise controller will be in the way of wiring lt fe Ed Wwe Top Bottom Side untencl UNT Enclosure Cover Figure 5 Installing the UNT Controller in ENC100 Enclosure Kit Installing the UNT To install the UNT in an ENC100 enclosure kit see Figure 5 use the in a ENC100 following procedure Enclosure Kit 1 Use a flat blade screwdriver and pliers to remove the necessary wire passage knockouts 2 Position the enclosure firmly against the mounting surface and mount it with the appropriate screws 3 Secure the UNT inside the enclosure kit using the three mounting tabs on the sides of the controller board base 4 Attach the enclosure cover after installing the wiring 14 UNT Controller Unitary Controller UNT UNTxxx 101 The UNT can be directly mounted into an EWC10 enclosure You may also purchase the UNT110 111 or UNT140 141 premounted in an EWC10 enclosure with 24 VAC 50 VA transformer When the UNT is premounted in an EWCIO enclosure with a 50 VA transformer th
15. Zone Terminal and AS CBLCON The bus interface sustains no damage in the presence of fault voltages of 24 VAC or less M100 actuators should be powered with separate transformers therefore only the Zone Bus and common wires need to be pulled See Table 15 for Zone Bus specifications 48 UNT Controller Unitary Controller UNT CBLPRO Description Table 15 Zone Bus Specifications Recommended Cable Type 18 AWG with shield Beldon 8760 or 24 AWG with no shield unshielded telephone cord Maximum Bus Length 150 m 500 ft with 18 AWG cable or 30 m 100 ft with 24 AWG cable Range of Addresses 0 to 63 Voltages Logic High Voltage 4 VDC minimum approximately Logic Low Voltage 1 VDC maximum approximately Data Transmission 1 Start Bit low level 8 Data Bits least significant bit first 1 Stop Bit high level Note If a CBLPRO 1 and a Zone Terminal are used the cable length must be limited to 15 m 50 ft The UNT110 111 UNT120 121 and UNT140 141 series controllers contain an LED that blinks to indicate Zone Bus activity with or without external connection During power up there is a brief delay while the UNT undergoes a diagnostic reset The LED will blink once turn off for approximately 10 seconds and turn on again When a PC communicates with the UNT via CBLPRO the blink rate may appear to change that is it may appear to be more steady Table 16 Zone Bus LED poh The
16. and 125 F with relative humidity non condensing maintained between 10 and 90 percent e UNT120 121 series controllers used with outdoor rooftop applications the temperature must be maintained between 40 and 52 C 40 and 125 F with relative humidity maintained between 10 and 90 percent Some intermittent condensation is tolerable This operating temperature range is possible in the UNT120 121 series controllers due to the heater coated circuit board and BZ 1000 7 size enclosure The UNT is commonly packaged either in an enclosure provided by the installation contractor or in an AS ENC100 0 or EN EWC10 0 enclosure The UNT140 141 101 and UNT110 111 101 come mounted in an EWC10 enclosure with a 50 VA transformer The controller requires a flat mounting surface area to match its dimensions The UNT controller has the following dimensions e 165 x 163 x 56 mm 6 5 x 64 x 2 2 in H x W x D without enclosure e 173 x 185 x 119 mm 6 8 x 7 3 x 4 7 in Hx W x D with the AS ENC100 0 enclosure e 229x406x 191 mm 9 0 x 16 0 x 7 5 in H x W x D with the EWC10 or UNTxxx 101 version Allow enough room to install the enclosure and conduit for wiring terminations to the controller 12 UNT Controller Unitary Controller UNT Enclosures for Mounting a UNT 120 121 Positioning The UNT120 121 low temperature rated controller must be installed in an enclosure as suggested below unless it is mounted within the enclosed low vol
17. and REF The N2 and N2 lines carry the data signals The REF line provides a reference so that each connected device is capable of electrically receiving and transmitting data by creating a common voltage reference among all the devices connected together by the N2 lines Three lines are required The configuration of the UNT can be uploaded downloaded and commissioned over the N2 Bus using an Operator Workstation OWS with HVAC PRO for Windows and an NCM or a PC with HVAC PRO for Windows and an MM CVT101 0 This can also be accomplished with Controller Access and Companion directly or remotely connected Refer to the Controller Access Technical Bulletin LIT 6364013 in the HVAC PRO for Windows User s Manual FAN 637 5 UNT Controller Unitary Controller UNT 45 Installing the N2 Bus Setting the N2 Address IMPORTANT The N2 and N2 lines must be twisted pair lines This allows most induced noise common mode noise from external sources to affect both lines equally thereby canceling the noise Notes Do not run N2 Bus wiring in the same conduits as line voltage wiring 30 VAC or above or wiring that switches power to highly inductive loads such as contactors coils motors or generators For more N2 Bus overview information refer to the Application Specific Controllers Technical Manual FAN 636 3 the Introduction tab the ASC and N2 Bus Networking and Troubleshooting Guide Technical Bulletin LIT 6363003
18. and cable components available from Anixter 4701 W Schroeder Drive Brown Deer WI 53223 Phone 414 355 0222 1 800 447 8565 Fax 414 355 8601 Use Table 36 to order preconfigured cables from Anixter Table 36 Preconfigured Cables Anixter Cable Length RJ45 Straight through 7 62 m 25 ft Q1093 307 25 Cable Assembly Non plenum Non keyed plugs 15 24 m 50 ft Q1093 307 50 24 AWG 30 48 m 100 ft Q1093 307 100 8 Conductor Solid Wire RJ45 Straight through 7 62 m 25 ft Q0893 404 25 Cable Assembly Plenum Non keyed plugs 15 24 m 50 ft Q0893 404 50 24 AWG 30 48 m 100 ft Q0893 404 100 8 Conductor Solid Wire UNT Controller Unitary Controller UNT 75 Use Table 37 to order cable components from Anixter for creating your own cables Table 37 Cable Components Anixter 304 8 m 1000 ft Roll of Non plenum CM 00424BAG 3 Rated e 24AWG e 8 e Solid Wire 304 8 m 1000 ft Roll of Plenum Rated CMP 00424SAS 3 e 24AWG e 8 Conductor e Solid Wire 8 Position Non keyed Plugs for Solid 074683 Stewart Cable bag of 25 Hand Tool with 8 Position Die Set for 060612 Solid 24 AWG Wire 76 UNT Controller Unitary Controller UNT Specifications Table 38 Specifications AS UNT110 1 AS UNT1 11 1 AS UNT120 1 AS UNT121 1 AS UNT140 1 AS UNT141 1 Power Requirements System 24 VAC 50 60 Hz at 40 VA per typical system Power Draw UNT with sensors transmitters 10 VA
19. is required if the NCM is to communicate with N2 devices On the NCM200 and NCM300 the specific connection point for the Metasys Network is the built in N2 Submodule On the NCM100 and NCM101 401 install this submodule into one of the submodule slots When installed in a Metasys Network the UNT receives commands from the NCM or Companion on the N2 Bus and transmits status reports in return The maximum electrical limit on the N2 Bus is 255 devices However the number of controllers on the N2 Bus is a database memory issue at the NCU or Companion Refer to the database generation documents in either the Metasys Companion Technical Manual FAN 628 1 or the Operator Workstation User s Manual FAN 634 to determine practical limitations to the number of controllers on the N2 Bus The N2 Bus connections are electrically isolated from other UNT110 111 UNT120 121 and UNT140 141 circuitry to 500V by optical and magnetic coupling For runs up to 1 520 m 5 000 ft use stranded 18 AWG or heavier twisted 3 conductor wire electrically lighter gauge wire works but it is fragile and prone to nicks and breaks Avoid using solid wire when possible as it is prone to break when pulled Runs longer than 5 000 feet require use of a bus repeater An N2 network may be extended to a maximum length of 4 568 m 15 000 ft using two repeaters The N2 Bus is a daisy chain communications line It consists of three wires carrying three signals N2 N2
20. is the internal shared node of each triac output see Figure 13 When connecting this terminal via the wire jumper to 24 VAC for high side switching each load must be connected between the binary output terminal and any common terminal When connecting this terminal to common for low side switching each load must be connected between the binary output terminal and any 24 VAC terminal UNT Controller Unitary Controller UNT 31 UNT140 141 Analog Outputs Zone Bus On the UNT140 141 series controller terminals labeled RTN Return are associated with the binary outputs and a jumper block sets high side or low side switching Setting the jumper block to Low Side BO sets the RTN terminals to 24 VAC Setting the jumper block to High Side BO sets the RTN terminals to common The 101 UNT111 UNT121 UNT141 controllers have two analog outputs The load connects between the analog output and analog output common terminals Each output generates a proportional voltage output of 0 to 10 VDC to common The maximum load for each output is 10 mA with a minimum 1000 ohm load resistance The Zone Bus provides UNT connections for 100 series actuators CBLPRO for HVAC PRO for Windows commissioning and the Zone Terminal ZT The Zone Bus is available for connection at the Zone Temperature Sensor Zone Humidity Sensor M100C series actuators UNT Controller Board and CBLPRO 32 UNT Controller Unitary Controller UNT
21. mode to force the controller into Occupied mode or insert a jumper across the defined occupied BI if the UNT is already configured to Occupied mode Check the configuration to verify if the fan was to cycle during Occupied mode Check air proving switch Restart by breaking and making unit power See above Remove actuator cover and check for 24 VAC across T1 and T2 Insert jumper CW to COM Actuator should fully open outdoor dampers Remove jumper Check that wire from Zone Bus on UNT is connected to bus terminal on actuator Check address of the M100C actuator it should be 22 Ensure Zone Sensor is properly connected with an 8 pin plug to the UNT Simulate a load at the sensor using HVAC PRO for Windows Simulate a value at the OA sensor using HVAC PRO for Windows Commissioning Wait until time delays have expired approximately five minutes Upgrade the ZTU100 0 to a ZTU100 1 Refer to the Zone Terminal Technical Bulletin in this manual for more information Set jumper so that triacs are switching proper side of transformer Add a 1k ohm 2 watt resistor across the relay coil Troubleshooting the N2 Bus Troubleshoot the N2 Bus if the Companion system is not properly communicating with the UNTs Tables 26 and 27 cover many UNT or N2 communication problems and suggest which actions to take Specific troubleshooting tests are also given in this section Before trying one of these tests y
22. resistance of all resistive sensor wiring should be less than 3 0 ohms A CAUTION Do not run AL BI AO BO ZBUS Bus wiring in the same conduit as line voltage wiring 30 VAC or above or wiring that switches power to highly inductive loads such as contactors coils motors or generators The insulator on the 15 VDC terminal prevents inadvertent shorting to the adjacent 24 VAC terminal To prevent damage to the controller remove and discard this insulator only when you need to use that specific terminal Table 11 Input and Output Load Impedances main mnt Range Impedance Impedance inputs o Al Voltage 0 2V or 0 10 VDC 470k ohm Al Temperature 1000 ohm Si Ni Pt or 3540 ohm Potentiometer 0 2k ohm Potentiometer BI VAC 60 Hz 0 24 VAC 2 5V 470k ohm AO Voltage 0 10 VDC 10 mA 1k 10M ohm maximum BO VAC Triac 24 VAC 50 800 mA 30 480 ohm With total controller power draw limited as described previously UNT Controller Unitary Controller UNT 37 Table 12 Sensor Wire Sizes and Maximum Lengths Sensor Type Length In Meters Feet Length In Meters Feet Al Voltage 152 4 m 500 ft 30 5 m 100 ft BI Voltage Contact 152 4 m 500 ft 152 4 m 500 ft 152 4 m 500 If a CBLPRO 2 and a Zone Terminal are used the cable length must be limited to 15 m 50 ft M100 R81CAA 2 850 CONTRELS METASYS A CAUTION If the same transformer is
23. used for both the UNT and M100 boards ensure that polarity is correct 1 COM connected to 1 to avoid shorting the transformer UNTxxx 1 Z CW EOM T shown here 24 ZBUS Note When you connect M100C CCW BUS T2 actuator to the Zone Bus we y recommend powering it with a ND separate 24 VAC transformer M100 Motor with R81CAA 2 Board HVAC PRO for Windows J indicates the needed address Zone Bus Address Switch Set address to 22 012345678 untm100c Figure 17 M100C Motor Zone Bus Connection Using an R81CAA 2 Board 38 UNT Controller Unitary Controller UNT When you connect an M100C actuator to the Zone Bus we recommend powering it with a separate 24 VAC transformer However you may use the UNT s transformer if it is sized to provide the required additional 20 VA and connected with the correct polarity See Figure 17 for terminal locations when wiring an M100C actuator M100 R81EAA 2 ANALOG INPUTS BINARY IN BINARY OUTPUTS LLL El aye 11955555 Outdoor Air Damper Control R81EAA 2 tf 24 VAC d 12024 uos Damper Command Power J common 7 Transformer Minimum Position m 4 aim 807 Override O Mixed Air Sensor
24. 5 SW Cable Assembly Plenum Non keyed plugs 15 24 m 50 ft CBL STAT50 SW 24 AWG 22 86 m 75 ft CBL STAT75 SW 8 Conductor 30 48 m 100 ft CBL STAT100 SW Solid Wire Use Table 33 to order cable components available from Southwest Wire for creating your own cables Table 33 Cable Components Southwest Wire 304 8 m 1000 ft Roll of Plenum Rated CMP 00424SAS 3 24 AWG e 8 Conductor e Solid Wire RJ45 Modular Plugs 100710 Premium Economy Crimp Tool 104012 Twisted Pair Easy Strip 104020 Tables 34 and 35 list preconfigured cables and cable components available from Windy City Wire 832 S Central Ave Chicago IL 60644 Phone 1 800 379 1191 Fax 773 379 1243 Use Table 34 to order preconfigured cables from Windy City Wire Table 34 Preconfigured Cables Windy City Wire RJ45 Straight through 7 62 m 25 ft CBL STAT25 WC Cable Assembly Plenum Non keyed plugs 15 24 m 50 ft CBL STAT50 WC 24 AWG 22 86 m 75 ft CBL STAT75 NC 8 Conductor 30 48 m 100 ft CBL STAT100 WC Solid Wire 74 UNT Controller Unitary Controller UNT Use Table 35 to order cable components from Windy City Wire for creating your own cables Table 35 Cable Components Windy City Wire 304 8 m 1000 ft Roll of Plenum Rated CBL 24 8STAT WC e 24AWG 8 Conductor e Solid Wire RJ45 Modular Plugs 100710 Premium Economy Crimp Tool 104012 Twisted Pair Easy Strip 104020 Tables 36 and 37 list preconfigured cables
25. 6NR20 4 Thomson VE17M00131K VE17M00251K VE17M00301K None VD24M00131K VD24M00251K VD24M00301K Indicates the preferred model if several are listed UNT Controller Unitary Controller UNT 17 VO and The I O wiring and N2 Bus must be clean without electrical noise Communications transients from nearby lighting heavy equipment switching or inductive Wiring loads being driven Tr ansient Noise For the N2 Bus the Transient Eliminator model TE JC04C12 made by Precautions Advanced Protection Technologies APT is recommended Refer to the Metasys Network Technical Manual FAN 636 the N2 Communications Bus Technical Bulletin LIT 636018 for more information 18 UNT Controller Unitary Controller UNT Wiring Details This section details the special precautions and grounding procedures you must observe when installing the UNT Possible Equipment Damage or Electrical Shock To avoid damaging equipment or suffering electrical shock ensure that all power supplies to the system have been disconnected prior to wiring installation The Complementary Metal Oxide Semiconductor CMOS circuits used in the controller are static sensitive Use static protection anti static mats and or grounding straps when working on or near internal circuitry Power Source The power transformer used must comply with and Loads e CSA 22 2 No 205 e ICS 2 Part 2 230 The power to each UNT must be limited to 3 ampe
26. AS CBLPRO is an interface device used between computer running HVAC PRO for Windows and Application Specific Controllers ASCs It is used for database downloading uploading or commissioning via the Zone Bus communication port When used with a Zone Bus device such as the UNT or ZT the CBLPRO is strictly an electrical interface between the serial RS 232 port of the computer and the Zone Bus CBLPRO operates on 24 VAC drawn from a UNT over the wire used to make the Zone Bus connections The data transfer rate on both the RS 232 and the Zone Bus is 1200 baud The connection to the RS 232 COM port of the computer is through a DB9 or DB25 connector supplied with the After connecting it make sure the CBLPRO is more than 30 cm 1 ft away from the computer monitor and system unit UNT Controller Unitary Controller UNT 49 IMPORTANT In some cases a computer monitor or PC will emit electromagnetic noise that may disturb CBLPRO communications Therefore do not position the CBLPRO near the monitor or PC Zone Bus communications to the application specific controllers or ZT may also be monitored with an AS CBLCON 0 This device has red and green LEDs whose purposes are described in Table 17 Table 17 CBLCON LED Description On On Zone Bus wire shorted to common or CBLCON 0 switch in download position Blinking Normal communications Refer to the Application Specific Controllers Technical Manual FAN 636 3
27. Application Specific Controllers Technical Manual 636 3 UNT Controller Section SYS Technical Bulletin ius Issue Date Unitary Controller UNT Introduction Page 5 e Description 5 e Standards Compliance 6 Configuring the Controller 7 e Using HVAC PRO for Windows Configuration Tool 7 e Defining a UNT Control Device Object 7 e Defining a UNT Control Device in Companion Software 9 Installation Procedures 11 e Design Considerations 11 e Tools Needed 11 e Environmental Information 12 e Mounting the Controller 12 e Power Line Wiring Transient Noise Precautions 16 e O and Communications Wiring Transient Noise Precautions 18 Wiring Details 19 e Power Source and Loads 19 e Wiring Precautions 21 e Grounding and Isolation UNT110 111 120 121 140 141 22 e Grounding and Isolation UNT110 111 UNT120 121 and UNT140 141 with Separate Load Transformer 28 ndicates those sections where changes have occurred since the last printing 1998 Johnson Controls Inc 1 Code No LIT 6363081 www johnsoncontrols com e Terminal Designations Page 25 e Analog Inputs 30 e Binary Inputs 31 e Binary Outputs Triac Jumper Information 81 e Analog Outputs 32 e Zone Bus 32 e Wiring to Unit Mounted Controls UNT 110 111 and UNT120 121 33 e Wiring to RLY050 002 Relays 85 e Wiring Sensors and Actuators 197 Networking the Controller 45 e N2 Bus Overview 45 Installing the Bus 46 e Zone Bus Communications 48 Applicat
28. Note 1 Separate low voltage wiring on the left from line voltage wiring on the right Note 2 Hand operation using the H O A switch requires common to the COILS terminal and 24 VAC to the TRIAC terminal to energize the relay Note 3 The Hand or Off position signals the binary input connected to those terminals These switches can be hardwire OR ed and connected to one BI This switch uses the HOA COM terminal which is isolated from the relays Note 4 Your application will determine exact connections to UNT Figure 15 UNT110 111 Wired to RLY050 002 UNT Controller Unitary Controller UNT 35 Figure 15 shows a jumper between 24 VAC and the triac If the jumper is between the triac and common make the following changes 1 Disconnect TRIAC from HOA COM 2 Reverse the COILS and TRIAC wires from RLYOSO to the UNT 3 Runa separate wire from HOA COM to 24 VAC at the Binary In terminal section Figure 16 shows a UNT110 111 wired to an RLY050 002 with all BOs isolated from earth ground BINARY OUTPUTS ANALOG INPUTS 3 3l of o lt lt lt lt BINARY IN of oe BI 2 6 15 0 15VDC vc 24 VAC 24 VAC AI CM 24 VAC COM B Low l gt High See Voltage Voltage Note 1 Note 3 7 j JET do i M NC NO COM NC
29. Series use the 15 VDC power supply terminals next to the inputs for AI 6 Table 9 shows each configuration Table 9 Analog Input Configurations Voltage V 0 to 2 VDC SW1 to Position V and SW2 to Position 2V Voltage V 0 to 10 VDC SW1 to Position V and SW2 to Position 10V Resistance 1 000 ohm Nickel Platinum SW1 to Position T and SW2 to Temperature T Silicon 2k ohm potentiometer Position 2V Setting the The UNT has two sets of DIP switches One set is for configuring the Analog DIP analog input points and the other set is for setting the controller address Switches Use Table 10 to set analog input DIP switches Instructions for setting the N2 Address DIP switches are in the Networking the Controller section of this technical bulletin CONTRELS METASYS ANALOG INPUTS 4 28 6 3 5 5 2 lt COMMONS o 9 m a B g 24VAC mm 24VAC TRACS mm Z GS eO e Look COMMON m co T 2V 10V V Analog Input Switches Figure 12 Setting the Analog Input DIP Switches 30 UNT Controller Unitary Controller UNT Binary Inputs Binary Outputs Triac Jumper Information UNT110 111 and UNT120 121 The AI switches should be factory set with AI 1 2 and 3 as resistive inputs and AI 4 5 and 6 as 0 to 10 VDC inputs You may reconfigure the switches by using the following table For example if you conn
30. UNT Controller Unitary Controller UNT 91 Table 42 UNT100 101 Terminal Identification Terminal AICM Alt AI CM 2 4 5 6 15 VDC 15 VDC BICM Bit BICM BI2 BICM BI CM Bl4 24 VAC POWER 24 VAC COMMON ZBUS Common 24 VAG B0 2a VAG 802 24 VAG 24 VAC B04 24 VAC B05 24 VAC B06 24 VAC AOCM 24 Volts AC BO 7 AO 1 Binary Output 7 AO Common Analog Output 1 24 VAC AOCM 24 Volts AC BO 7 AO 2 Binary Output 7 AO Common Analog Output 2 92 UNT Controller Unitary Controller UNT Grounding and Isolation UNT100 101 Transformer 11 120 24 e S 24 24 5 2 Power E gt 9 Transformer 5 V PA 5 t a z as 6 z wn 4 gt Load A Contactor N Isolation Relay Isolation visoxfmr UNT100 101 Figure 42 Transformer and Relay Isolation Wiring Diagram for Series 100 101 UNT Controllers All UNT100 101 connections must be isolated from earth ground to protect the CBLPRO laptop PC or other system components from damage Due to OEM system designs and or electrical codes the UNT100 101 may become earth grounded unless you take isolation measures osos Potential equipment damage and improper functioning Do not earth ground the 24 VAC high side of the UNT transformer or any of the UNT BO termin
31. Wiring to Unit A Mounted CAUTION Some local electrical codes require the secondary Controls common of stepdown transformers be connected to UNT110 111 and earth ground typically on units which are powered by UNT120 121 greater than 150 VAC You may have a maximum of one single earth ground connection which must be at the transformer secondary common whether one or multiple controllers are powered by the same transformer ____ LED BINARY OUTPUTS UNT Controller d M Shared Triac Node Triac Switching gt 11113 A 4 Wiring Connections 24 ZBUS REF N2 N2 VAC Jumper allows field selection of the supply leg to be switched by the triacs In this example the triacs terminal is jumpered to 24 VAC so the triacs switch the 24 VAC power high side leg COM L1 L2 24 Unit Mounted Control Enclosure tepdown 24 4 Transformer COMMON COMPRESS Heat Comp Relay See the Application Examples section for more information See CAUTION for Wiring to Unit Mounted Controls UNT110 111 and UNT 120 121 section On unit mounted controls OEMs typically minimize wiring between digital controls an
32. a DC current to flow through the triac which can prevent it from turning off If you are unfamiliar with the gas valve in your rooftop unit a pilot relay is recommended 84 UNT Controller Unitary Controller UNT Keep the length of the high voltage wire from the ignition control to the spark bundled and as short as possible Bundle the spark wire to itself if it is too long Keep the ignition control and the UNT as far apart as possible Route the power wires to the ignition control along the metal mounting surface Ensure that you physically separate the wires on the line side of the filter from those on the load side of the filter Route noisy wiring so that its path is as short as possible and always avoid routing noisy wires close to quiet wires We recommend a 30 cm 1 ft or greater separation between parallel noisy and quiet wires Never mount the UNT in the same compartment as the ignition device e If you must install noisy wiring near quiet wiring have the wires cross at right angles and as far apart as possible Route both near the metal mounting surface Note For specific information regarding noisy and quiet wiring refer to the Application Specific Controllers Technical Manual FAN 636 3 the Introduction tab the ASC and N2 Bus Networking and Troubleshooting Guide Technical Bulletin LIT 6363003 UNT Controller Unitary Controller UNT 85 Metal Barrier
33. als If you do the UNT N2 Bus communications will cycle online and offline You will also damage all of the interface components that are connected including the CBLPRO laptop PC Companion PC and MM CVT101 Depending on the primary voltage of the power transformer and the prevailing electrical code the 24 VAC secondary might be earth grounded Earth ground on the 24 VAC side of the secondary destroys hardware by creating a short circuit path through the CBLPRO and laptop PC serial card during a download Earth ground on either side of the secondary can disrupt the isolation required for N2 communication integrity UNT Controller Unitary Controller UNT 93 Power Transformer Isolation UNT100 101 Load Isolation UNT100 101 Binary Inputs Binary Outputs In some OEM systems the contactor solenoid coils driven by the UNT may also be earth grounded This also disrupts the isolation required for N2 communication integrity Note The Troubleshooting section of this technical bulletin contains a detailed process that will reduce installation errors by ensuring proper isolation If the secondary of the power transformer is grounded you must use a separate 24 VAC to 24 VAC isolation transformer such as the Y65G13 see Figure 42 If UNT output loads such as driven contactor or solenoid coils are grounded you must use a separate isolation relay for each load see Figure 42 The binary inputs on the UNT100 101 series c
34. ample in Figure 30 Johnson Controls recommends that packaged rooftop applications have separate transformers for controller and loads Sharing of transformers for controller and loads for packaged rooftop wiring is not recommended Table 22 Packaged Rooftop Parameters and Configuration Selections Zone Humidity o _ Exhaust Air T Return Air DA Outdoor Air 7 dS ete e _ i TE TE prmech Figure 30 Packaged Rooftop Mechanical Flow Diagram UNT Controller Unitary Controller UNT 55 120 VAC d ANALOG 14 Power Transformer EX IN EPRE jo a gt Ir 9 lt gt x a 24 VAC 24 VAC 120 24 VAC 120 VAC 24 VAC 24 VAC 120 24 VAC R Equipment 24 VAC B Equipment Ground G Indoor Blower W1 Heat Stage 1 W2 Heat Stage 2 Y1 Cooling Stage 1 Y2 Cooling Stage 2 TE1 Room Sensor Triac Jumper Removed BINARY TRENER 5 IE e 24VAC COM ZBUS W2 Yi Unit Terminal Strip priwire2 Phase correctly and size the transformer to include 20 VA for the M100C se
35. ary Controller UNT 23 A separate load transformer may be necessary because of transformer VA limitations or may be desirable to completely isolate loads from the UNT digital circuitry for better noise immunity You may connect the UNT110 UNT120 or UNT140 power transformer secondary directly to earth ground If you elect to do so the grounded side must connect to the common input terminal of the controller A CAUTION Equipment damage hazard You may have a maximum of one single earth ground connection which must be at the transformer secondary common whether one or multiple controllers are powered by the same transformer When grounding one side of the transformer secondary the grounded side must connect to the common power input terminal Connecting the grounded side of the transformer to the 24 VAC power input terminal will damage a CBLPRO 1 0 or laptop You may connect the separate load power transformer secondary to earth ground as long as doing so is compatible with the equipment being controlled 24 UNT Controller Unitary Controller UNT Terminal The UNT terminal designations that identify sensor actuator and power Designations connection points are illustrated in Figures 10 11 and 41 Terminal functions are listed in Tables 7 8 and 42 You may make connections to the UNT by connecting single wires to the individual screw or spade terminals Note The N2 terminal connectors on the new 1 s
36. ary Output Triac Connections on Terminal Strip Versions of the UNT140 141 34 UNT Controller Unitary Controller UNT Wiring to RLY050 002 Relays Connect power to the relay module and the transformer through the conduit knockouts in each box Wire the module according to the following diagrams For a schematic diagram of the relay module see the Application Specific Controllers Technical Manual FAN 636 3 the AHU Controller tab the AHU Controller Technical Bulletin LIT 6363010 the AHU Tower Wiring Details section Possible equipment damage or electrical shock Disconnect power circuit before wiring relay kit Figure 15 shows a UNT110 111 wired to an RLY050 002 with BOs isolated from earth ground BINARY OUTPUTS rp up Opty YALE el el e z 9158168 gt s 5 A ANALOG INPUTS 444444 Sj gt of of Of o ai lt lt lt lt COMMON BO8 COMMON BO 7 z o lt Low High See Voltage lt gt Voltage Note 1 Note3 AT C gt i 37 M B COILS KO e Rac NC HAND OFF HN HOA BO Wo f I COM AS RLY050 0 AS RLY002 0 unt1ahu
37. cts Connects Terminal Terminal Spade Lugs Spade Lugs Spade Lugs Spade Lugs Block Block Available UNT110 101 UNT111 101 UNT140 101 UNT141 101 Premounted in EWC10 with 24 VAC 50 VA Transformer Standards The UNT complies with the following standards Compliance FCC Part 15 Subpart B Class A e IEEE 472 e IEEE 587 Category A e UL 916 UL 864 6 UNT Controller Unitary Controller UNT Using HVAC PRO for Windows Configuration Tool Defining a UNT Control Device Object Configuring the Controller All UNTxxx 1 models require HVAC PRO for Windows HVAC PRO for Windows also works with previously released UNT models This software tool configures commissions uploads and downloads the UNT database Refer to the HVAC PRO for Windows User s Manual FAN 637 5 for more information on configuring the UNT In a Metasys Network System enter data into the Attribute menu to define a UNT device object 1 2 On the Item menu click New UNT Item New ype Accumulator Analog data Analog input Analog output digital Analog output setpoint O Binary data Binary input Binary output MS data MS input MS output O Control system O DL LR group O LC group PID loop Fire Zone 12 devices 2 devices 82 devices Card Reader Hardware system name Hardware object name Copy of System Object
38. d equipment interface relays by using one leg of the stepdown transformer as common Figure 13 Binary Output Triac Connections on Quick Connect Versions of the UNT110 111 and UNT120 121 UNT Controller Unitary Controller UNT 33 Triac Switching Jumper Internal Wiring Connections LOW HIGH 72114 E GG CERERE Jumper allows REF N2 field selection VAC BUS e of the supply leg to be switched by the triacs UNT Controller Triac Switching In this example the triacs BOs will switch to the 24 VAC power high side leg OOOO OOO O OO O 24 vac 814 jag BO RTN BO4 805 BOG 24 Bl2 B04 B02 B01 COM 24 VAC L1 L2 Unit Mounted Control Enclosure n d f Stepdown 24 VAC Transformer T COMMON FAN COMPRESS Fan Heat Comp Relay Relay Relay wireunt2 See CAUTION for Wiring to Unit Mounted Controls UNT110 111 and On unit mounted controls OEMs typically minimize UNT120 121 section wiring between digital controls and equipment interface relays by using one leg of the stepdown transformer as common Figure 14 Bin
39. e 6 00 and Controller Access Because the communication rate is 9600 baud performing this process over the N2 Bus saves a great deal of time when loading the initial configuration files and parameters into the controller UNT Controller Unitary Controller UNT 59 60 UNT Controller Unitary Controller UNT Hardware Installation Inspection Tools Needed for Troubleshooting Installation Checkout Troubleshooting Once the mechanical contractor starts receiving delivery of the UNTs with factory mounted controls we recommend that arrangements be made to pull a sample of the shipment for bench testing This can be done by loading a job configuration before all the controllers are mounted in the unit cabinets Tools needed for typical troubleshooting include e ASC and Bus Networking and Troubleshooting Guide Technical Bulletin LIT 6363003 e Digital Multimeter DMM 100k ohm resistor optional Double banana plug see Figure 34 available from a local electronics store or ITT Pomona Stock No 34F856 or 34F845 100k ohm 1 4 watt resistor for earth ground voltage tests 100k ohm 1 4 watt Use double banana plug for all tests that require 100k ohm resistor placed in parallel with DMM Steps 27557 1 Connect 100k ohm resistor under plug s prongs 2 Insert banana plug into DMM a 3 Connect leads of DMM into banana plug banana dh Figure 34 Doubl
40. e Banana Plug Used with 100k ohm Resistor Review the mounted UNT and compare it with the appropriate illustrations in the nstallation Procedures section of this technical bulletin to ensure proper installation Also refer to the engineering drawings supplied for the individual site 1 Ensure that the mounting screws holding the subassembly onto the base frame are secure Ensure that accessory equipment is connected and labeled correctly Ensure that the controller terminal connections are secure Ensure that the N2 connections are secure and labeled correctly Sa Ensure that the UNT switches are appropriately positioned Refer to the Wiring Details and Networking the Controller sections of this technical document 6 Ensure that there are no unwanted earth ground connections to the controller UNT Controller Unitary Controller UNT 61 Although a single earth ground connection to the common terminal of UNT110 111 UNT120 121 and UNT140 141 series controllers is allowed you may not intend to have one The procedures described in the following directions may be used when no earth ground connections to the UNT are intended or to ensure that there is only one earth ground connection Isolation and This section will help you ensure proper isolation within your system Grounding UNTS These procedures are not required but are recommended to reduce without an Earth installation errors To ensure proper isolation test the fol
41. e model number will be UNTxxx 101 rather than UNTxxx 1 For instructions on mounting the enclosure to a wall see the Application Specific Controllers Technical Manual FAN 636 3 the Accessories tab the Universal Packaging Module Technical Bulletin LIT 6363070 Low Voltage 172 Wiring Trough untpwer2 Figure 6 UNT Premounted in EWC10 with 50 VA Transformer UNTxxx 101 Mounting a UNT To mount the UNT in the EWCIO use the following procedure 1 Position the terminals of toward the low voltage wiring trough located on the left side of the enclosure see Figure 6 2 Align the three mounting holes in the base of the controller with the holes in the backbone of the enclosure On the side with four mounting holes use the two outside holes for mounting in the EWC 3 Secure the controller with three No 8 x 1 in screws For best results use a plastite type thread A thread forming or sheet metal type thread may also be used UNT Controller Unitary Controller UNT 15 Power Line Wiring Transient Noise Precautions Surge Levels The standard UNT when powered by any typical separate isolation transformer or stepdown transformer operates reliably in an electrical environment defined as Location Category A by the IEEE 587 Standard that is when installed more than 30 feet from electrical distribution panels or major bus and feeder systems in industrial p
42. ect a 10 VDC input to AI 4 set SW1 4 to Off and SW2 4 to On Table 10 Analog Input DIP Switch Settings Point Input 2 VDC Input 10 VDC Input Switch SW1 SW2 swi SW2 swi SW2 ____ or ov uz ow or or ow or om or or on ma ow or om o or on ms ow or om or on Lue ow or om or on Four binary inputs on the controller are located in the center of the terminal strip The binary inputs on the UNT110 111 120 121 and 140 141 series controllers are inactive when open or connected to UNT common When a binary device closes to complete a binary circuit the binary input provides the 24 VAC which in turn activates the input Binary inputs have a threshold between 5 VAC and 18 VAC BI 4 may be used as an accumulator input for frequencies less than 2 Hz Binary outputs are triacs on the controller hardware The controller has either six or eight binary outputs These outputs switch 24 VAC to the output For the UNT110 111 UNT120 121 and UNT140 141 series controllers use the terminal labeled TRIACS when using a separate load transformer Remove the high side low side triac jumper on the UNT110 111 UNT120 121 and UNT140 141 for this application see Figure 8 For important power and load specifications see Table 5 The terminal labeled TRIACS on the UNT110 111 and UNT120 121 series controllers
43. ed by the same transformer Grounding and Isolation UNT110 111 2024 MH 120 121 ET ower 140 141 La Transformer s Nee 8 A 2 N i 15VDC OF Q 8 x al To zay 7801 Load 7 BO2 lt Triac Contactor isoxfmr2 Triac Jumper to Note UNT110 is shown in illustration 24 VAC only Diagram is for all UNT models Figure 7 Transformer Wiring Diagram for UNT110 111 UNT120 121 and UNT140 141 Series Controllers You may connect the UNT power transformer secondary directly to earth ground If you elect to do so the grounded side must connect to the common power input terminal of the controller A CAUTION You may have a maximum of one single earth ground connection which must be at the transformer secondary common whether one or multiple controllers are powered by the same transformer When grounding one side of the transformer secondary the grounded side must connect to the common power input terminal Connecting the grounded side of the transformer to the 24 VAC power input terminal will damage a CBLPRO 1 0 or laptop 22 UNT Controller Unitary Controller UNT Power 24 VAC to 24 VAC isolation transformers for UNT110 111 Transformer UNT120 121 and UNT140 141 series controllers are not mandatory Isolatio
44. ely isolated circuit Line SHE Voltage lt gt 24VAC 7 100k mae E 189K mn 1 4 oa lt transfmt Figure 36 Testing the Transformer Determine the polarity of the transformer s leads by using a DVM referenced to earth ground without the 100k ohm resistor see Figure 36 Connect the transformer s secondary lead with the higher voltage potential to the 24 VAC terminal on the UNT Connect the transformer s secondary lead with the lower potential to the 24 VAC common terminal on the UNT 64 UNT Controller Unitary Controller UNT Load Isolation UNTs without an Earth Ground Connection If the field wires are not yet connected the Field Device Wiring Isolation UNTs without an Earth Ground Connection section was skipped disconnect one 24 VAC wire and terminate the field wires Reconnect the 24 VAC wire e Connect the leads of the DVM in parallel with the 100k ohm resistor from the DC power supply 15 VDC output terminal of the UNT to earth ground see Figure 37 This tests whether the field devices the UNT and the transformer assembly are properly isolated If you read 5 VDC VAC or greater indicates the circuit is improperly isolated Follow these steps to correct this Note Binary outputs are often the cause of ground loops therefore we recommend that you test the binary outputs of the UNT before testing other points 1 Remove all the field wires and N2 Bus wires f
45. eries controllers are different from the UNTxxx 0 series The REF N2 and N2 terminations are arranged in different order see Figure 9 UNTxxx 0 UNTxxx 1 compare Figure 9 N2 Terminal Connector Comparison UNT Controller Unitary Controller UNT 25 T 2 218 m LIg 5 E 0207 WOOV lt a 2 07 WOOV ome gr o 908 Bm 808 5 gu NONNO m NOWINOO Ho NOWNOO 02 98 so 5 groa nomos yA p 908 S 5 608 sov Osoa lt gt 2504 TR 2508 208 OVArE 8 ofa 5 ey a m 09 2 CN bo 2 CJ 334 gt pote EN _ r3 snaz Z 8 8 woo o snaz I OVArZ t A WOO ER Ecm OVATE 718 OWA 54 2 EE obi 3 88 vig 2 S Sia 2 T amp 0 m OVA OQAS 91 WOlV 5 WO IV o 2 E lt lt lt 21 ANALOG INPUTS lt o lt ANALOG INPUTS WO IV
46. hm the circuit may be properly isolated It will not be isolated if there are earth grounds that exist at higher voltages A value of infinite ohms indicates a completely isolated circuit at approximately zero volts Connect this wire to the appropriate UNT terminal and check the next wire Field Device IN OUT IN OUT COM or LED Test Circuit Preferred Method ow 0 10 470 5 1 4 watt SX TP isocirct Figure 35 Testing for an Isolated Circuit UNT Controller Unitary Controller UNT 63 Power Transformer Isolation UNTs without an Earth Ground Connection This section will assist you in determining if the supply transformer is properly isolated Before connecting the transformer to the UNT connect the input power to the primary leads of the 24 VAC transformer Measure the voltage of each secondary transformer lead to earth ground with the DVM in parallel with a 100k ohm 1 4 watt resistor see Figure 36 if using a double banana plug insert the plug into the DVM If you read 5 VAC VDC or greater the transformer is earth grounded You need an isolation transformer in order to isolate the connections from earth ground and protect system components Wire a separate 24 VAC to 24 V AC isolation transformer such as the Y65G13 to the UNT If you read less than 5 VAC VDC the circuit is properly isolated Usually a value less than 0 10 VAC VDC indicates a complet
47. igh Volume Transducer 0 5 to 19 psig relay HE 6300 Series Wall Mount Humidity 12 30 VDC Supply Transmitter HE 6310 Series Duct Mount Humidity 18 30 VDC Supply Transmitter HE 6400 Series Metastat Various Humidity Temperature Transmitter Wall Mount 6100 11 12 Series Zone Temperature Sensor Nickel 1000 ohm with Phone Jack TE 6300 Series Temperature Sensor Nickel Platinum Silicon TE 6400 Series Metastat Zone Temperature Resistance Sensor Series Table 30 UNT Dampers and Valve Actuators VA 715x Series Valve Actuator Incremental or 0 to 10 VDC Proportional VA 7200 Series Valve Actuator Incremental or 0 to 10 VDC Proportional VA 8020 Series Valve Actuator Assemblies 1 2 in 24 VAC Triac Incremental VA 8022 Series Valve Actuator Assemblies 1 2 in 0 to 10 VDC VA 8050 Series Valve Actuator Assemblies 1 2 in 24 VAC Triac Incremental 3 4 in 1 in and 1 1 2 in VA 8051 Series Valve Actuator Assemblies 1 2 in 24 VAC Triac Incremental 3 4 in 1 in and 1 1 2 in with Feedback VA 8052 Series Valve Actuator Assemblies 1 2 in 0to 10 VDC 3 4 in 1 in and 1 1 2 in EDA 2040 Series 24 VAC Triac Incremental M100C Series Zone Bus Addressable M100E Series 24 VAC Triac M100G Series 0 to 10 M9000 500 Series Valve Linkage Assembly for 0 5 through 2 in Globe M9100 and M9200 Direct Mount style Valve Bodies Actuators Direct Mount Proportional Damper to 10 VDC Actuator Direct Mount Proportional
48. il current as well as from the spark or contact arc itself Electromagnetic fields are also present around wires carrying power to the ignition control These are noisy wires For more information refer to the Power Line Wiring Transient Noise Precautions section of this technical bulletin UNT Controller Unitary Controller UNT 81 Nuisance Rooftop units experiencing nuisance resets require an application upgrade Resets in Use HVAC PRO for Windows Version 6 05 or greater and the following Rooftop Units procedure 1 2 3 4 5 6 7 Run HVAC PRO for Windows 6 05 or greater Go to the Upload menu Select Upgrade Controllers Select Multiple Controllers Highlight the rooftop controllers experiencing the nuisance resets Select OK Save each configuration when prompted Note Factory downloaded applications in all UNT controllers have been upgraded effective December 15 1997 however even on the new units if controller applications are modified the modifications must be performed using HVAC PRO for Windows Version 6 05 or greater Rooftop units with 460 VAC or greater primary voltage require additional changes under the following conditions If the controller Date Code is less than 9618 perform the following procedure a Loosen the 24 VAC and COM screws of the input power connector b Insert the terminals of a Harris V47ZA7 Transient Voltage Suppressor into the 24 VAC and COM slots of the input p
49. inal Locations TB1 Terminal Function Number UNT Connection _______ Chassis Ground 6 N2 Bus N2 UNT Controller Unitary Controller UNT 47 N2 Wiring to A hardware connection between the N2 Communications Bus and the Companion Companion PC Panel LTD is required to communicate with N2 devices An MM CVT101 0 Communications Converter is required to network to the PC Companion See Figure 25 for terminal locations Refer to the Metasys Companion Technical Manual FAN 628 1 for information specific to the MM CVT101 or Companion Panel LTD Companion PC Version BHNSON CONTRELS METASYS RS232 to N2 Bus Converter N2 Bus Terminal 9VDC 9 V COM MM CVT101 0 NL To 1 N Next P f N2 N2 RE Device Figure 25 Connecting the UNT Controller to Companion Note For more information on installing the N2 Bus refer to the Application Specific Controllers Technical Manual FAN 636 3 the Introduction tab the ASC and N2 Bus Networking and Troubleshooting Guide Technical Bulletin LIT 6363003 Zone Bus Communications Zone Bus The Zone Bus is a 2 wire communications bus that allows a computer to Description communicate with the UNT to download the UNT s database and to communicate with the Zone Terminals and M100 actuators A third wire is used for 24 VAC power to the CBLPRO
50. ion Examples 51 e Fan Coil Applications 51 e Unit Vent Applications 53 e Packaged Rooftop Applications 55 e Heat Pump Applications 57 Downloading Commissioning 59 e Commissioning Procedures 59 Via Zone Bus 59 e Via N2 Bus 59 Indicates those sections where changes have occurred since the last printing 2 UNT Controller Unitary Controller UNT Troubleshooting Page Hardware Installation Inspection Tools Needed for Troubleshooting Installation Checkout Troubleshooting the UNT Controller with HVAC PRO for Windows Troubleshooting the N2 Bus Zone Bus Troubleshooting HVAC PRO for Windows Ordering Information Johnson Controls Code Numbers Vendor Code Numbers Specifications Appendix A Precautions for Rooftop Installations Environmental Information Installation Requirements Electrical Noise in Rooftop Units Nuisance Resets in Rooftop Units Considerations for Gas Ignition Considerations for Specific Rooftop Units Appendix B UNT100 101 What s Different About UNT 100 101 UNT100 101 Terminal Designations Grounding and Isolation UNT100 101 Binary Inputs Binary Outputs Indicates those sections where changes have occurred since the last printing UNT Controller Unitary Controller UNT 61 61 61 61 67 69 70 71 71 73 77 79 79 79 81 82 84 88 91 91 91 93 94 94 3 4 UNT Controller Unitary Controller UNT Description Introduction The Unita
51. l on the York relay board to the A2 terminal 88 UNT Controller Unitary Controller UNT Table 41 York Rooftop Unit Serial Number Date Conversion Second Digit Month Third Digit UNT Controller Unitary Controller UNT 89 90 UNT Controller Unitary Controller UNT What s Different About the UNT100 101 UNT100 101 Terminal Designations Appendix B UNT100 101 This section contains information specific to the discontinued UNT100 101 To troubleshoot the UNT100 101 refer to the Troubleshooting section of this technical bulletin The following list contains features of the UNT100 101 which differ from the other UNT types pd 3 3 il 3 9 sz a 4 4 No earth ground connections are allowed when wiring a UNT100 101 series controller The N2 bus is not isolated The secondary of the 24 VAC transformer cannot be grounded The BIs can accept dry contacts only not 24 VAC They can also accept 100 Hz as accumulator input The BO is not jumper selectable The triac switches to the common side of 24 VAC only AS UNT101 0 TO ZONE STAT BINARY OUTPUTS 43 8 a 44 8 3 3 3 ANALOG INPU BINARY 44414 COMMON 232 15VDC 15v DC LA EL AICM 24VAC B lt lt 2 Figure 41 UNT100 Terminal Designations untrm100
52. lants IEEE 587 Location Category A power line surge noise level is specified at 6 500 A Normal Mode Ringwave The UNT exceeds the Category A specification by meeting these surge levels as well TEEE 587 style Common Mode Pulse 3 kV 587 style Normal Mode Pulse 1 5 472 style Common Mode Ringwave 1 5 472 style Normal Mode Ringwave 500 V When the controller is installed within 9 m 30 ft of electrical distribution panels or major bus and feeder systems in industrial plants you must take further precautions to prevent unwanted binary output cycling resetting or other possible controller malfunctions This electrical environment is defined as Location Category B by the IEEE 587 Standard You can use the following method to prevent electrical noise from adversely affecting the controller e Connect an MOV Metal Oxide Varistor across the UNT supply transformer primary The MOV must be rated appropriately for the line voltage Use the list in Table 4 to select the correct MOV sold through your electronics parts distributor The UNT meets the following power line surge noise standards when you correctly apply the MOV as described TEEE 587 Common Mode Pulse 1 5 Normal Mode Pulse 6kV Normal Mode Ringwave 6kV 472 Common Mode Ringwave 1 5 Normal Mode Ringwave 500 V Note The 50 VA split bobbin transformer in the EWC15 or 101 model UNT provides additional surge noise immu
53. lowing Ground Connection e field device wiring for proper isolation e transformer for isolation and correct polarity termination connected field devices transformer and UNT for proper isolation 62 UNT Controller Unitary Controller UNT Field Device Wiring Isolation UNTs without an Earth Ground Connection This section assists you in measuring field wiring which will be terminated to the UNT If you are confident that the field wiring has no earth grounds you may go to the following section Power Transformer Isolation UNTs without an Earth Ground Connection A field device that is earth grounded may become apparent when you test the entire controller Before you terminate the field wires to the UNT measure the resistance of each wire to earth ground using an LED test circuit preferred DVM For the LED test circuit assemble the test circuit illustrated in Figure 35 Then connect the circuit from each input to earth ground and then from each output to ground For the DVM test connect the DVM from each input to earth ground and then from each output to ground see Figure 35 If the LED turns On or you read a value less than 1 Megohm at any input or output the circuit is improperly isolated Replace or repair the wiring or the field device or for a binary output add an isolation relay Repeat the test until the LED does not turn on If the LED does not turn On or you read a value greater than 1 Mego
54. lowing adequate room for installation and maintenance accessibility Also take into consideration any existing power sources or communication lines The UNT must be secured to a solid wall and not to any vibrating surface IMPORTANT Do not mount the UNT near high voltage or electrically noisy devices Refer to Appendix A Precautions for Rooftop Installations For a typical installation you need the following e HVAC PRO for Windows software current release e IBM PC compatible laptop computer e Microsoft amp Windows 3 xx 95 e AS CBLPRO 2 for Zone Bus downloading uploading and commissioning or MM CVT101 0 for N2 downloading uploading and commissioning e two screwdrivers 1 8 in and 1 4 in flat blade e drill e optional AS ZTU100 1 Zone Terminal unit Note The AS ZTU100 1 supports both AS UNTxxx 0 and AS UNTXxxx 1 models The AS ZTU 100 0 supports AS UNTXxxx 0 models only UNT Controller Unitary Controller UNT 11 Environmental Information Mounting the Controller Physical Dimensions The installation site of the UNT must meet the following environmental standards e The atmosphere must be free of explosive vapors and escaping gases e atmosphere must be free of exposure to corrosive chemical or salt vapors that might damage electrical equipment e UNT100 101 UNT110 111 and UNT140 141 series controllers the temperature must be maintained between 0 and 52 C 32
55. n Load Isolation UNT110 111 UNT120 121 and UNT140 141 series controllers do not require an isolation relay However you must connect the jumper wire from the triac terminal to 24 VAC if the contact or coil loads are grounded via the single earth ground connection at the transformer secondary common see Figure 7 In this case all loads are configured for high side switching see Figure 13 For the UNT140 141 you must move the jumper block to the appropriate position rather than use a jumper wire Grounding and P Optional 120 24 Isolation 2 Earth Ground UNT110 111 UNT S v 12 Power e UNT120 121 Transformer v UNT COMMON Only and UNT140 141 M zd with Separate Load Transformer M 11 120 24 L L2 Bowel Transformer a 3 To Load Contactor isoxfmr Shared Triac Node Note UNT110 is shown in illustration Discard small wire jumper Diagram is for all UNT models Figure 8 Transformer Wiring Diagram for UNT110 111 UNT120 121 and UNT140 141 Series Controllers with a Separate Load Transformer A CAUTION Equipment damage hazard When separate transformers are used it is very important to remove the jumper that otherwise connects the triacs terminal to 24 VAC high side or common low side This prevents possible controller damage UNT Controller Unit
56. n open air environment must be limited to a maximum of 75 VA Tables 5 and 6 will assist you in determining the total 24 VAC power draw of your system Table 5 UNT Power and Load Specifications UNT with Sensors Transmitters 10 VA 400 mA 25 VA for UNT120 121 due to heater BO Load Relay Contactor Solenoid Incremental Actuator Refer to specific product Maximum allowable load for any individual binary documentation output triac is 19 VA 800 mA at 24 VAC Minimum required load for each binary output triac used is 1 2 VA 50 mA at 24 VAC Relay loads less than 50 mA may cause triac relay chattering If necessary use a 1k ohm 2 watt resistor across the relay coil Triac BOs cannot drive loads which use DC currents such as a device which has a full wave rectifier Triacs can drive only AC resistive or inductive loads i e AC relays contactors and actuator motors If the driving of a DC device is required a pilot relay must be used to isolate the triac AO Load See Table 6 Actuator Maximum allowable load for each AO is 10 mA 10 VDC with a minimum load resistance of 1 000 ohms Zone Terminal or CBLPRO 1 2 VA 50 mA Actuator VA requirements found in Table 6 With total controller power limited as described previously 20 UNT Controller Unitary Controller UNT Wiring Precautions Table 6 Actuator VA Requirements VA Requirements Actuator Spring Ret
57. nity For more information refer to Appendix A Precautions for Rooftop Installations in this technical bulletin 16 UNT Controller Unitary Controller UNT Table 4 MOV Selection Table Power Transformer Primary Voltage S 120 VAC 208 to 240 VAC 277 VAC 347 VAC Minimum 130 to 135 VRMS 250 to 280 VRMS 300 to 320 VRMS 385 VRMS Continuous Only 250V types listed Voltage Rating Minimum Energy pu Joules 55 Joules 80 Joules per Joules Rating Minimum Peak 4 000 NN 4 000 Amperes 4 000 Amperes 4 000 Current 8 x 20 micro second pulse V130LA10A V250LA20A None None V130LA20A V250LA40A V130LA20B V250LA40B V130K14 V250K14 V300K14 V385K14 LEN NN NEN NN NI 0632170 131 15 D6321Z0V251RA90 D6321Z2OV301RA105 D6521ZOV131RA20 D6521Z0V251RA130 D6521ZOV301RA150 D692172OV131RA09 D6921Z0V251RA72 0692170 301 80 VSAC20DK201U VSAC20DK391U VSAC20DK471U VSAC20DK621U TNR15G211KM TNR15G391KM TNR15G471K TNR23G201KM TNR23G391JM TNR23G471K TNR23G211KM TNR23G391KM Oneida CKE OZ130LA10A OZ250LA20A 07211471 None OZ130LA20A OZ250LA40A OZ130LA20B OZ250LA40B 07211221 0216NR14 3 0216NR20 4 Panasonic ERZ C14DK201U ERZ C14DK391U ERZ C14DK471U ERZ C14DK621U ps 23225955135 202250552516 232250550016 22250553816 S14K130 S14K250 S14K300 S14K385 pem eem 0216NR14 3 0390NR14 3 0620NR14 3 0620NR14 3 0216NR20 4 0390NR20 4 0620NR20 4 0620NR20 4 0216NR20DB 0416NR14 3 041
58. nsor CBLPRO or ZT and CBLPRO or ZT to eae Sensor Al 2 Warmer Cooler 24 VAC or Cooling Setpoint 3 Al 1 Temperature 3 24 VAC ZnBs Sensor Common Al 1 Sensor 4 Not Used Ene Al 2 3 Common 24 VAC ZnBs Not Used Common Notes When using the Metastat do not move the hardware point assignments in HVAC PRO for Windows For information on cables refer to the Vendor Code Numbers section in this technical bulletin 42 UNT Controller Unitary Controller UNT Sharing a Sensor You may use one sensor as a master input to multiple instead of mounting and wiring separate Zone Sensors for each controller This application is especially beneficial when you have a mechanical system that uses more than one terminal unit to serve the same area for example a classroom with two unit ventilators or an open office space with multiple water source heat pumps Figure 22 shows the wiring and analog input switch settings for two controllers using one Zone Sensor When sharing a sensor both controllers must be set to the same temperature sensor type the default is resistive nickel on the HVAC PRO for Windows Analog Input Modify screen To ensure the noise immunity of the UNTS pull the N2 Bus wiring with the sensor wiring between controllers that share the same sensor Set the HVAC PRO for Windows software for both controllers for the temperature sensor used Set for Set for 2 VDC and 2 VDC and Voltage Tempera
59. ollers must be between 40 and 52 C 40 and 125 F Use the UNT120 121 series controllers in extremely cold environments or where some condensation is possible The UNT120 121 series controllers have built in heaters and conformally coated circuit assemblies You must mount the UNT120 121 series controller within a relatively small enclosure such as a BZ 1000 7 or within the confined area of the rooftop unit s wiring cabinet for optimal heater efficiency Instructions for installing a UNT in a rooftop unit are detailed in this section 1 Mount the UNT inside the rooftop unit or some other enclosure to protect it from outside elements such as rain snow etc 2 Install a separate transformer not the rooftop unit s power transformer to provide 24 VAC power to the UNT You may use a line voltage to 24 VAC transformer or a 24 VAC to 24 VAC isolation transformer We recommend using one of the following transformer types Note Unless the UNT has a separate transformer the UNT is prone to resetting due to electrical noise within the rooftop unit UNT Controller Unitary Controller UNT 79 Table 39 Recommended Transformers Transformer Type Power Description Johnson Controls AS XFR050 0 120 VAC to 24 VAC insulated windings high noise immunity resettable breaker 3 Drive rooftop unit loads via pilot relays see Figure 40 if any of the following conditions exists e The rooftop unit contains any contacto
60. one Bus clear then try again UNT Controller Unitary Controller UNT 69 Notes For more N2 Bus troubleshooting information refer to the Application Specific Controllers Technical Manual FAN 636 3 the Introduction tab the ASC and N2 Bus Networking and Troubleshooting Guide Technical Bulletin LIT 6363003 For NCM troubleshooting information refer to your NCM technical bulletin Zone Bus There are some errors that may occur while using the HVAC PRO for Troubleshooting Windows commissioning tool with the UNTs over the Zone Bus The HVAC PRO for cause of the error is often a loose or improper connection between the Windows CBLPRO AS CBLPRO laptop PC and the controller A defective COM port on the laptop or a defective controller could also be at fault Note It takes ten seconds for a UNT to reset and resume communication after being downloaded An effective troubleshooting technique is to use a CBLCON and observe its LEDs which will indicate the problem see Table 17 for a description of LEDs and their meanings You may also try exchanging the component that you believe is defective with a working component of the same type A noisy wire adjacent to the Zone Bus can also cause communication errors Noise can be periodically induced into the Zone Bus thereby causing sporadic communication failures between the laptop and the UNT Most often noisy lines cause intermittent disruption not total loss of communication F
61. ontrollers are inactive when open or 5 VDC logical high is supplied They are active when a contact closure to UNT common or a logical low is applied BI 4 may be used as an accumulator input for frequencies less than 100 Hz Each UNT100 series controller s binary outputs must be connected between the BO terminal and 24 VAC terminal since it is low side switching 94 UNT Controller Unitary Controller UNT Notes UNT Controller Unitary Controller UNT 95 JeHNSON CONTROLS Controls Group 507 E Michigan Street P O Box 423 Milwaukee WI 53201 96 UNT Controller Unitary Controller UNT Notes www johnsoncontrols com FAN 636 3 Application Specific Controllers Technical Manual Printed in U S A
62. or more information on HV AC PRO for Windows refer to the HVAC PRO for Windows User s Manual FAN 637 5 70 UNT Controller Unitary Controller UNT Johnson Controls Code Numbers Controllers Ordering Information Tables 28 31 list code numbers and descriptions for the UNTs and accessory equipment Table 28 UNT Controllers and Accessory Equipment AS UNT110 1 UNT with eight binary outputs N2 Isolation and triac high or low side selectable AS UNT111 1 UNT with six binary outputs two analog outputs N2 Isolation and triac high or low side selectable AS UNT120 1 UNT110 controller with heater for low temperature use AS UNT121 1 UNT111 controller with heater for low temperature use AS UNT140 UNT110 controller with screw terminals for field terminations and spare 6 pin Zone Bus phone jack AS UNT141 1 UNT111 controller with screw terminals for field terminations and spare 6 pin Zone Bus phone jack AS UNT110 101 UNT110 mounted in EN EWC10 0 enclosure with 50 VA transformer AS UNT111 101 UNT111 mounted in EN EWC10 0 enclosure with 50 VA transformer AS UNT140 101 UNT140 mounted in EN EWC10 0 enclosure with 50 VA transformer AS UNT141 101 UNT141 mounted in EN EWC10 0 enclosure with 50 VA transformer UNT Controller Unitary Controller UNT 71 Sensors Transmitters Dampers and Valve Actuators Table 29 UNT Sensors and Transmitters Code Number EP 8000 Series Electro Pneumatic 0 to 10 VDC H
63. ou may be able to determine the cause of the problem by asking yourself the following questions e Are the 2 Bus wires securely terminated to each UNT e Is the 2 polarity correct e 5 the UNT powered and ready to respond e Have you cycled power UNT after changing its address Refer to Installing the N2 Bus in this technical bulletin e Are the UNTs configured properly with the correct number of points A WARNING Electrical shock hazard When troubleshooting always measure the REF to earth ground voltage with the DMM If line voltage is measured have a qualified electrician locate the fault Table 27 Troubleshooting the N2 Bus Symptom PossibleCause Action _______ Bus is Offline EOL jumpers and or W3 Install EOL jumpers and W3 jumper on MM CVT101 or jumper properly Companion Panel LTD are not installed MM CVT101 is not plugged Plug MM CVT101 into PC or into PC or 9 VDC source into 9 VDC source N2 Bus polarity is incorrect Rewire N2 Bus wires for proper polarity UNT Does Not Come Two or more UNTs have the Change each duplicate UNT Online same address address to a unique number The address of the UNT was Cycle power on the UNT changed without its power being cycled afterward The 10 second delay after Wait until the delay expires downloading the UNT has not yet expired HVAC PRO Revision 1 0 or earlier Someone is commissioning Wait until the Zone Bus is over the Z
64. ower connector c Tighten the 24 VAC and COM screws of the input power connector If a separate transformer is used to supply the binary output voltage install a Metal Oxide Varistor MOV according to the following procedure see Figure 38 a Order an AS MOVKIT O as needed Each kit contains 12 Metal Oxide Varistor MOV assemblies b Remove the field wire that currently connects to the triacs terminal c Attach the field wire to the male terminal of the MOV assembly 82 UNT Controller Unitary Controller UNT d Attach the female terminal with two wires to the TRIACS terminal e Attach the female terminal with one wire to the common terminal immediately adjacent to the TRIACS terminal Note The MOV assembly will be factory installed on UNT220 1 controllers mounted in York rooftop units beginning March 16 1998 The MOV assembly will not be factory installed on UNT120 1 controllers e For units meeting both conditions install transient voltage protectors in both locations as described above Attach field wire here Common Triacs workaround Figure 38 Installation of MOV UNT Controller Unitary Controller UNT 83 Considerations for Gas Ignition Rooftop Units containing Gas Ignition Control see Figure 39 or Figure 40 IMPORTANT If the gas valve or ignition controller has a full wave bridge rectifier you must install a relay between the BO and the gas valve and ignition controller
65. r fan dropout or cycling that appears as abnormal operation to the customer Lennox has authorized bypassing K25 blower control when you use Johnson Controls UNTs 2 York Rooftop Units UNT120 1 and UNT220 1 controllers when installed in rooftop units may experience nuisance resets This is evidenced by numerous unexplained offline conditions with durations of less than one minute To alleviate this situation in York rooftop units bypass or disable the supply fan relay according to the following procedure Note These modifications apply only to those units described below Units built after the dates indicated have already been modified by York and do not require this change The date of manufacture of York rooftop units can be determined from the second and third digits of the serial number as shown in Table 41 e On 3to 6 ton units built before February 17 1997 the relay must be disabled by disconnecting the wire that connects the time delay relay contacts to the relay board This is typically the 234 BLUE wire e On 3 to 6 ton units built between February 17 1997 and May 30 1997 York implemented a different relay interface board On this new relay board the K5 relay must be bypassed by moving the wire currently connected to the G terminal on the York relay board to the A2 terminal e On7 to 25 ton units built before February 28 1997 the K5 relay must be bypassed by moving the wire currently connected to the G termina
66. r relay coils that might be energized by some means other than directly by the UNT s binary outputs A common example of this is a time delay relay contact closure in a BO circuit e individual BO load exceeds 800 mA e All loads together will cause the UNT to require more than 40 VA of 24 VAC power when mounted in an enclosure or more than 75 VA when mounted in a well vented open area e Voltages other than 24 VAC need to be switched Note Install pilot relays for isolation between the UNT and the rooftop unit contactors relays 4 You may drive rooftop unit contactor relay loads directly see Figure 39 if all of the following conditions exist e Under normal operation the UNT binary outputs directly drive all contactor relay coils within the rooftop unit e Individual BO loads exceed 50 mA Required to keep the triac on e Individual BO loads not exceed 800 mA e The UNT and all its loads together draw less than 40 VA of 24 VAC power when mounted in an enclosure or less than 75 VA when mounted in a well vented open area e Triac load voltage is 24 VAC 5 Note Connect the UNT binary outputs triacs to the rooftop unit terminal strip 80 UNT Controller Unitary Controller UNT Electrical Noise in Rooftop Units IMPORTANT When using pilot relays to ensure electrical isolation between the binary outputs and their loads pilot relays must be used on all BOs This ensures that electrical noise c
67. reated by contact closure or opening of a pilot relay cannot travel back through the BO wiring or any other BO and adversely affect the UNT s other binary outputs that are not relay isolated A pilot relay to the economizer is an exception to this because it drives a circuit not a relay contactor load Ensure that relays have adequate isolation between coil and contacts Many relays on the market do not provide suitable isolation Capacitance between the coil and contacts must be less than 3 pico farads As manufacturers do not specify this parameter remember that smaller relays generally have more capacitance RLY 100 and RLY050 relays provide suitable isolation Ensure that relays provide a minimum of 50 mA load to the UNT binary output If the selected relays draw less than 50 mA you must add appropriately rated resistors in parallel with the relay coil to avoid possible relay chattering We recommend using 1k ohm 2 watt resistors Rooftop air handling units may be very noisy from an electrical standpoint This is due to contacts switching inductive loads and electrical spark ignition devices You must take precautions to prevent electrical noise from causing false BO triggering resetting of UNTs or interference with N2 communication There is wide variation in relays contactors and gas ignition control devices Some are much noisier than others Electromagnetic fields can radiate from wires carrying spark or co
68. res or less However if you use one low voltage power trunk to power multiple controllers follow these precautions e Ensure that polarity is maintained at each 24 VAC connection e Enclose 24 VAC power trunks with greater than 4 amperes 100 VA in conduit as required by the National Electric Code NEC e Do not share a UNT s power transformer with a Companion Panel any other device with a full wave rectifier in its power supply UNTs use half wave rectification Half wave circuitry and full wave circuitry must not share the same transformer Consider all the actual loads as well as the basic load of the controller when determining the system load Notes Some local electrical codes require that the secondary common of the stepdown transformer be connected to earth ground typically on units which are powered by greater than 150 VAC The M100 draws 20 VA if using common power for the controller and the M100 actuator It is recommended that each M100 use its own 24 VAC isolation transformer UNT Controller Unitary Controller UNT 19 IMPORTANT Any individual binary output triac can drive up to 800 mA when you limit the total 24 VAC power draw You must limit the power draw of a controller and its load to avoid heat dissipation problems The total 24 VAC power draw of a UNT installed in an ENC100 or similar size box must be limited to a maximum of 40 VA The total 24 VAC power draw of a UNT mounted in a
69. rials Valve Actuator VA 8052 Valve Actuator Assembly R1 Lighting Relay GE RR7 52 UNT Controller Unitary Controller UNT Unit Vent Table 20 lists the selections made through HVAC PRO for Windows for Applications the example in Figure 28 Table 20 Unit Vent Parameters and Configuration Selections Unoccupied Override of Heating Valve Cooling Type Lighting Integration Return Air ae WY Discharge Air NS Outdoor Air L 4 ER LA gt 1 Figure 28 Unit Vent Mechanical Flow Diagram UNT Controller Unitary Controller UNT 53 A 240 24 VAC TE1 240 VAC Power 24 VAC RM T Transformer RM SP m 7 7 BINARY OUTPUTS Prd tl LII ANALOG INPUTS BINARY IN aN Triac to 24 VAC BOs High Side Switched PNEUM uvwire Figure 29 Unit Vent Wiring Example Table 21 Unit Vent Bill of Materials TES Discharge Air Sensor TE 6300 Series EP1 Electric to Pneumatic Interface EP 8000 Series DA1 Zone Damper Actuator M100CGA 2 54 UNT Controller Unitary Controller UNT Packaged Rooftop Applications Table 22 lists the selections made through HVAC PRO for Windows for the ex
70. ries actuator Figure 31 Packaged Rooftop Wiring Example with Separate Transformers for Controller and Loads 56 UNT Controller Unitary Controller UNT Bill of Materials Heat Pump Applications Table 23 Packaged Rooftop Bill of Materials TE3 Outdoor Air Sensor TE 6300 Series S1 Air Flow Switch P32 Series DA1 Damper Actuator M110CGA 2 For more information on rooftop installations refer to Appendix A Precautions for Rooftop Installations in this technical bulletin Table 24 lists the selections made through HVAC PRO for Windows for the example in Figure 32 Table 24 Heat Pump Parameters and Configuration Selections Supplemental Heat Two Stages Lighting Integration A Discharge Air gt 1 Return Air d TO 0 4 I lt TE hpmech Figure 32 Heat Pump Mechanical Flow Diagram UNT Controller Unitary Controller UNT 57 BINARY OUTPUTS 4 1111 L EEEE mmo Wri d ______ PUTS BINARY IN Triac to R Equipment 24 VAC 24 VAC B Equipment Ground G Indoor Blower W Reversing Valve Y Compressor R GW Y W2 W1 Heat Stage 1 R1 Auxi Aux2 W2 Heat Stage 2 Elect Heat Unit Terminal Strip 120 24 VAC 120 VAC 24 hpwire X Figure 33 Heat Pump and E
71. rom the UNT but leave the transformer wires attached With the DVM still connected reconnect each set of field wires one at a time until you read 5 VDC VAC or greater At this point you have discovered one cause of the ground loop Correct the problem If you check all the field wires and you still read greater than 5 VDC VAC the transformer secondary is earth grounded In this case wire a 24 VAC to 24 VAC isolation transformer to the UNT and measure again If the value is still 5 VDC VAC or greater replace the UNT Continue to reconnect each set of field wires until all ground loops are found and corrected You ll know that all grounds are corrected when you read less than 5 VDC VAC on the DVM If you read less than 5 VDC VAC the circuit is properly isolated A value of less than 0 10 VDC VAC indicates a completely isolated circuit UNT Controller Unitary Controller UNT 65 UNT 24 VAC AWC Line Voltage lt 24 gt 24 COM Field Wiring P 100k ohm D DVM 5 VDC VAC OK Isolated 1 4 watt gt DVM gt 5 VDC VAC Earth Grounded 1 AICOM BICOM ZBUS COM AOCOM BOCOM grdloop Figure 37 Testing for Ground Loops e Connect the DVM across the 24 VAC and the 24 VAC common terminal of the UNT Read the voltage with all typical loads energized A reading of 24 VAC is required when the line voltage is nominal If you read a value less than 20 VAC make sure the primary voltage matches the
72. ry Controller UNT is an electronic device for digital control of packaged air handling units unit ventilators fan coils heat pumps and other terminal units serving a single zone or room It also can be configured as a generic Input Output I O device for basic point monitoring applications when used within a Metasys Network You can easily configure point inputs and outputs and software features to control a wide variety of Heating Ventilation and Air Conditioning HVAC equipment applications The UNT may be used as a standalone controller or connected to the Metasys Network through a Network Control Module NCM or Companion M When connected to the Metasys Network the UNT provides all point control information to the rest of the network The devices communicate through an N2 Bus For a smaller facility the UNT can function as a standalone controller Figure 1 illustrates the UNT JgHNSON 5 METASYS Figure 1 Unitary Controller UNT You may use the UNT for unit ventilator rooftop heat pump or fan coil applications or as a generic I O multiplexer and I O sideloop control Each has a different sequence of operation all of which are covered in the HVAC PRO for Windows User s Manual FAN 637 5 The Unitary Controller is available in different hardware sets to suit different environmental and application needs Table 1 lists the common
73. ser s Manual FAN 634 describes the general procedures for entering and modifying data Table 3 Blank UNT Object Attributes Attribute __________ Description Entry Values Object Name Identifies the object 1 to 8 alphanumeric i e UNT1 The object characters name cannot be duplicated in the system Expanded ID Further identifies the object 0 to 24 alphanumeric i e Garage Level Heater characters optional 9 On the Item menu select Save to save the new UNT object and add the object to the NCM database 10 Upload the NCM to make an archive copy of the new object Refer to the Operator Workstation User s Manual FAN 634 Uploading from the NCM To define a UNT control device in Companion refer to the Metasys Companion Technical Manual FAN 628 1 UNT Controller Unitary Controller UNT 9 10 UNT Controller Unitary Controller UNT Design Considerations Tools Needed Installation Procedures Instructions for installing the UNT and its accessories are detailed in this section The number and types of components sensors and actuators used with the UNT will vary according to application Analyze the proposed installation for logical locations to place these devices and draw an inventory based on that study Information on available accessory devices is in the Ordering Information section of this technical bulletin Decide how close the UNT can be to the air handling equipment while still al
74. tage electrical compartment of the mechanical unit being controlled The BZ 1000 7 enclosure is the common package for a UNT120 121 mounted in the air stream or in the mixed air chamber of a mechanical unit The BZ 1000 7 enclosure is the recommended size for optimum performance of the UNT120 121 Venting the BZ 1000 enclosure possibly removing unused knockouts using the AS ENC100 0 or EN EWC 10 0 or using a larger enclosure is recommended for environments that regularly exceed 32 C 95 F The UNT120 121 series controller has the following dimensions e 165 x 163 x 56 mm 6 5 x 6 4 x 2 2 in H x W x D without enclosure 259 x 249 x 76 mm 10 2 x 9 8 x 3 in Hx W x D with the BZ 1000 7 enclosure e 229 x 406 x 191 mm 9 0 x 16 0 x 7 5 in Hx W x D with the EWC10 or UNTxxx 101 version Before installation position the controller and enclosure on the proposed mounting surface to ensure that the calculated mounting area is correct Precise distance measurements can be made between controller terminals and sensor actuator mounting points on the air handling equipment if the equipment is in place Confirm electrical power source and conduit requirements at this time Note You can install UNT100 101 UNT110 111 or UNT140 141 series controller in a control panel or in an AS ENC100 0 or EN EWC10 0 enclosure You must enclose UNT120 121 series controller in a BZ 1000 7 enclosure or another enclosure of comparable dimensions
75. tion which must be at the transformer secondary common whether one or multiple controllers are powered by the same transformer Table 26 indicates symptoms and corrections for possible controller malfunctions We recommend the use of HVAC PRO for Windows Commissioning mode during all troubleshooting procedures Note While in the commissioning program you are actively viewing the controller s inputs and outputs The screens will automatically refresh the data values when the controller senses a change in value UNT Controller Unitary Controller UNT 67 Table 26 Troubleshooting the UNT with HVAC PRO for Windows Indoor Fan Does Not Run M100C Zone Bus Economizer Actuator Does Not Open to Minimum Position Heating or Cooling Will Not Turn On Automatically ZT Display Contains Dots Binary Output Will Not Turn On or Chatters 68 UNT Controller Unitary Controller UNT Unit not in Occupied mode Unit does not need heating or cooling Fan off due to air flow loss Indoor fan not proven Actuator or linkage Wiring problem Zone Sensor not connected Zone temperature not above below setpoint Heating or cooling lockout from outdoor temperature Delay timers present Configuration mismatch between the controller and the ZT a ZTU100 0 is used with a UNTxxx 1 controller TRIAC Jumper is not set correctly Load is not drawing 50 mA minimum load for triac Use the Commissioning
76. transformer s voltage rating For details refer to the Power Source and Loads section of this technical bulletin and recalculate the VA requirements for the UNT You have completed the UNT isolation tests If you plan to connect this UNT to the N2 Bus for communication to other devices refer to the Application Specific Controllers Technical Manual FAN 636 3 the Introduction tab the ASC and N2 Bus Networking and Troubleshooting Guide Technical Bulletin LIT 6363003 66 UNT Controller Unitary Controller UNT Grounding UNT110 111 UNT120 121 and UNT140 141 with an Earth Ground Connection Troubleshooting the UNT Controller with HVAC PRO for Windows An earth ground connection to the common terminal of the UNT110 111 UNT120 121 and UNT140 141 series controllers is allowed for the 24 VAC power supply and the binary output triacs when set up for high side switching If this earth ground connection exists it must be at the transformer secondary common terminal only There should be 0 VAC measured from a common terminal to earth ground and over 20 VAC from a 24 VAC terminal to earth ground when power is applied If no earth ground connections were planned for the power supply and or triacs and you suspect that an earth ground may exist use the procedure described above for the UNT100 101 controller to test for the presence of a ground loop condition A CAUTION You may have a maximum of one single earth ground connec
77. ture Metastat 8 pin Connection on Back Sensor Sensor Note Route sensor wiring and N2 wiring together Since the UNT Controller is a self terminating device end of line termination for the N2 Bus is not required cd Figure 22 Example of Sharing a Sensor Among UNT Controllers A CAUTION Multiple controllers sharing a sensor may only have one single earth ground connection among them Even if separate transformers are used only one may be physically tied to earth ground and that connection must be at the transformer secondary common UNT Controller Unitary Controller UNT 43 Note If the master Zone Sensor uses the Zone Bus connection only the master controller can be loaded and commissioned from the sensor connection The AI offset feature in HVAC PRO for Windows will have to adjust 1 F at the slave AIs to compensate for each additional controller sharing a sensor 44 UNT Controller Unitary Controller UNT N2 Bus Overview Wiring the Controller to an NCU N2 Bus Characteristics Networking the Controller If you are already familiar with the N2 Bus go to Installing the N2 Bus A hardware connection between the N2 Communications Bus and the Network Control Module NCM of the Network Control Unit NCU
78. urn Spring Return Non spring Return Voltage 0 to 10 VDC Voltage 0 to 10 VDC Follow these precautions when wiring Make all wiring connections in accordance with the NEC as well as in accordance with local regulations Locate equipment and route the wiring so that signal wiring is a twisted pair and separated from power wiring as much as possible Make all wiring connections to the UNT using only copper conductors Daisy chain the N2 The use of Y or bus topologies without a repeater installed in the T may cause a loss of communications Do not use wire smaller than 22 AWG Do not run N2 Bus Zone Bus Analog Input AD Binary Input BI Analog Output AO or Binary Output BO wiring in the same conduit or bundle as line voltage wiring 30 VAC or above or wiring that switches power to highly inductive loads such as contactors coils motors or generators Notes Shielded N2 Bus wiring can be run in the same conduit or bundle as 24 VAC power wiring Zone Bus AI AO and BI wiring can be run in the same bundle or conduit where convenient If the binary output wiring is not wired through other switches or contacts you may also bundle it with the other I O wiring where convenient UNT Controller Unitary Controller UNT 21 You may have either no earth ground connection or one earth ground connection which must be at the transformer secondary common whether one or multiple controllers are power
79. xternal Transformer Wiring Example Sor Materials Table 25 Heat Pump Bill of Materials Part Number C1 Digital Controller AS UNT 110 1 TE1 Zone Temperature Sensor TE 6400 Series 58 UNT Controller Unitary Controller UNT Commissioning Procedures Via Zone Bus Via N2 Bus Downloading Commissioning Commissioning a UNT begins after the unit is mounted and wired and the control and hardware software features have been defined through HVAC PRO for Windows Refer to the HVAC PRO for Windows User s Manual FAN 637 5 for complete controller configuration and commissioning information A Zone Terminal or laptop PC with HVAC PRO for Windows is recommended to perform a complete system startup procedure However these accessories are not required for the basic procedure detailed in this section Downloading and commissioning via the Zone Bus requires using the CBLPRO interface and a laptop or PC running the HVAC PRO for Windows software You can connect to the Metastat 6 pin connector or directly at the controller UNT140 141 models have a spare 6 pin connector so that the connection from a Metastat or Zone Sensor would not need to be disconnected during download commissioning Communication rate is 1200 baud over the Zone Bus See Figure 20 HVAC PRO for Windows release 5 00 or higher allows you to perform downloading and commissioning over the N2 Bus using MM CVT101 0 Metasys OWS Release 6 0 or higher or Companion Releas

Unitary Controller (UNT) - Johnson Controls

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