Johnson Controls UNT110-1 Manual
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Johnson Controls UNT110-1 Manual

Unitary controller
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• Mounting the Controller
• I/O and Communications Wiring Transient Noise Precautions
and UNT140/141 with Separate Load Transformer
• Analog Inputs
• Binary Outputs (Triac Jumper Information)
• Analog Outputs
© 1998 Johnson Controls, Inc.
Code No. LIT-1628320
Unitary (UNT) Controller
* Indicates sections where changes have occurred since the last printing.
Application Specific Controllers Technical Manual 1628.2
UNT Controller Section
Technical Bulletin
Issue Date 1098
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Summary of Contents for Johnson Controls UNT110-1

  • Page 1: Table Of Contents

    UNT140/141 with Separate Load Transformer • Terminal Designations • Analog Inputs • Binary Inputs • Binary Outputs (Triac Jumper Information) • Analog Outputs * Indicates sections where changes have occurred since the last printing. © 1998 Johnson Controls, Inc. Code No. LIT-1628320 www.johnsoncontrols.com...
  • Page 2 Page • Zone Bus • Wiring to Unit Mounted Controls--UNT110/111 and UNT120/121 • Wiring to RLY050/002 Relays • Wiring Sensors and Actuators Networking the Controller • N2 Bus Overview • Installing the N2 Bus • Zone Bus Communications Application Examples •...
  • Page 3 • Using HVAC PRO for Windows Configuration Tool • Defining a UNT Control Device Object • Defining a UNT Control Device in Companion or Facilitator Software Ordering Information • Johnson Controls Code Numbers • Vendor Code Numbers Specifications Appendix A: Precautions for Rooftop Installations •...
  • Page 4 4 UNT Controller—Unitary (UNT) Controller...

  • Page 5: Introduction

    Introduction In this document, Facility Management System (FMS) is a generic term, which refers to the Metasys® Network, Companion™, and Facilitator™ supervisory systems. The specific system names are used when referring to system-specific applications. Table 1: Related Documents Document Title Code Number Air Handling Unit (AHU) Controller Technical LIT-6363010...
  • Page 6 AN AL OG INPU TS BIN AR Y IN PU T BINAR Y O UTPU T 1 2 3 4 5 6 1 2 3 4 1 2 3 4 5 6 ZONE S TA T Z B U S 1 2 3 4 5 6 ANAL OG IN PU TS 24 V AC...

  • Page 7: Standards Compliance

    Table 3: 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 (32 to 125°F) (32 to 125°F) (-40 to 125°F) (-40 to 125°F)
  • Page 8 8 UNT Controller—Unitary (UNT) Controller...

  • Page 9: Installation Procedures

    Installation Procedures Instructions for installing the UNT and its accessories are detailed in this Design section. The number and types of components (sensors and actuators) used Considerations 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.

  • Page 10: Environmental Information

    The installation site of the UNT must meet the following environmental Environmental standards: Information • The atmosphere must be free of explosive vapors and escaping gases. • The atmosphere must be free of exposure to corrosive chemical or salt vapors that might damage electrical equipment. •...
  • Page 11 Enclosures for The UNT120/121 low temperature rated controller must be installed in an Mounting a enclosure as suggested below, unless it is mounted within the enclosed, UNT 120/121 low voltage 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.
  • Page 12 Do not use this knockout. Otherwise, controller will be in the way of wiring. Top / Bottom Side untencl UNT Enclosure (Cover) Figure 2: Installing the UNT Controller in ENC100 Enclosure Kit Installing the UNT To install the UNT in an ENC100 enclosure kit (see Figure 2), use the in a ENC100 following procedure: Enclosure Kit...
  • Page 13 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 a 24 VAC 50 VA transformer. When the UNT is premounted in an EWC10 enclosure with a 50 VA transformer, the model number will be UNTxxx-101 rather than UNTxxx-1.

  • Page 14: Power Line Wiring Transient Noise Precautions *14

    The UNT must be installed more than 9 meters (30 feet) from electrical Power Line distribution panels or major bus and feeder systems in industrial plants, Wiring when powered by standard transformers without MOVs. Transient Noise Precautions Surge Levels Without MOVs, the UNT meets the following surge levels: IEEE-587 style Common Mode Pulse 3 kV IEEE-587 style Normal Mode Pulse...
  • Page 15 Table 4: MOV Selection Table Power Transformer Primary Voltage 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 Only 250V types listed Continuous Voltage Rating 30 Joules 55 Joules 80 Joules...
  • Page 16 The I/O wiring and N2 Bus must be “clean,” without electrical noise I/O and transients from nearby lighting, heavy equipment switching, or inductive Communications loads being driven. Wiring Transient Noise For the N2 Bus, the Transient Eliminator, model TE/JC04C12, made by Precautions Advanced Protection Technologies (APT) is recommended.

  • Page 17: Wiring Details

    Wiring Details This section details the special precautions and grounding procedures you must observe when installing the UNT. WARNING: 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.
  • Page 18 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.

  • Page 19: Wiring Precautions

    Table 6: Actuator VA Requirements Actuator Type VA Requirements Incremental 3 VA EDA-2040 (ATP-2040) VA-7150 2.7 VA 4.7 VA VA-7152 VA-7153 Incremental or 0-10 VDC 2.7 VA VA-7200 Proportional 5.5 VA 7.5 VA VA-7202 VA-7203 5.5 VA Incremental 4 VA VA-8020 VA-8050 Incremental...

  • Page 20: Grounding And Isolation Unt110/111, 120/121, 140/141 *20

    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 powered by the same transformer. Grounding and Isolation UNT110/111, 120/24 120/121, Power 140/141 Transformer 24 VAC + 1 5V D C...

  • Page 21: Grounding And Isolation Unt110/111, Unt120/121

    Power 24 VAC to 24 VAC isolation transformers for UNT110/111, Transformer UNT120/121, and UNT140/141 series controllers are not mandatory. Isolation 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;...
  • Page 22 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. 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.

  • Page 23: Terminal Designations

    The UNT terminal designations that identify sensor, actuator, and power Terminal connection points are illustrated in Figures 7, 8, and 41. Terminal Designations functions are listed in Tables 7, 8, and 41. You may make connections to the UNT by connecting single wires to the individual screw or spade terminals.

  • Page 24: Binary Inputs

    A NA L O G IN PU T S B IN A R Y IN PU T B IN A RY O UT P U T Z O NE ST AT Z B U S 1 2 3 4 5 6 AN A LO G IN PU T S 2 4 VAC C O M M O N...
  • Page 25 Table 7: UNT110/111 and UNT120/121 Terminal Identification Terminal Description Terminal Description Analog Input Common Analog Input 1 AI CM AI 1 AI CM Analog Input Common AI 2 Analog Input 2 Analog Input Common Analog Input 3 AI CM AI 3 AI CM Analog Input Common AI 4...
  • Page 26 LO W HI GH T RIAC SW IT C H IN G ZONE Z O NE STAT ST AT Z B US 1 2 3 4 5 6 + 15 A I3 AI4 A I5 B O 1 BO 2 BO 3 BO 4 BO 5 BO 6 BO 7 BO 8...
  • Page 27 Table 8: UNT140/141 Terminal Identification Terminal Description Analog Input 1 A COM Analog Input Common Analog Input 2 Analog Input 3 A COM Analog Input Common Analog Input 4 Analog Input 5 Analog Input Common A COM Analog Input 6 +15 VDC +15 Volts DC Supply Binary Input 1...
  • Page 28 The six analog inputs, the +15 VDC power supply, and their commons Analog Inputs 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.
  • Page 29 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 connect a 10 VDC input to AI 4, set SW1-4 to Off and SW2-4 to On.
  • Page 30 UNT140/141 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.
  • Page 31 Wiring to Unit CAUTION: Some local electrical codes and NEC 250 require the Mounted secondary common of stepdown transformers be Controls-- connected to earth ground on units which are powered UNT110/111 and by greater than 150 VAC. You may have a maximum UNT120/121 of one single earth ground connection, which must be at the transformer secondary common, whether one or...
  • Page 32 Triac Switching Jumper Internal Wiring Connections HIGH Jumper allows COM Z REF N2 field selection of the supply leg UNT Controller to be switched Triac Switching by the triacs. In this example, the triacs' BOs will switch to the 24 VAC power BO2 BO3 BO4 BO5 (high side) leg.
  • Page 33 Connect power to the relay module and the transformer through the Wiring to conduit knockouts in each box. Wire the module according to the RLY050/002 following diagrams. For a schematic diagram of the relay module, see the Relays AHU Tower Wiring Details section of the Air Handling Unit (AHU) Controller Technical Bulletin in FAN 636.3 or 1628.2.
  • Page 34 Figure 12 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 RLY050 to the UNT. 3.
  • Page 35 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 an AS-CBLCON-0. For additional information, refer to the grounding and isolation information in the Wiring Details section of this technical bulletin.
  • Page 36 Table 12: Sensor Wire Sizes and Maximum Lengths 18 AWG Wire Size Run 24 AWG Wire Size Run Sensor Type Length In Meters (Feet) Length In Meters (Feet) 152.4 m (500 ft) 30.5 m (100 ft) AI Temperature (Resistive) AI Voltage 152.4 m (500 ft) 30.5 m (100 ft) 152.4 m (500 ft)
  • Page 37 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 14 for terminal locations when wiring an M100C actuator.
  • Page 38 HE-6300 Humidity Perform the following steps to connect an HE-6300 Humidity Sensor to Sensor the UNT (see Figure 16): Set the analog input DIP switches on the AS-UNTxxx board to 10 volts: Switch 1 = OFF Switch 2 = ON 2.
  • Page 39 Temperature Sensors ANALOG INPUTS BINAR Y INP UT BINA RY O UT PU T Z O N E S T A T Z B U S 1 2 3 4 5 6 ANALOG INPUTS 24 V A C C O M M O N 1 2 3 4 5 6 ANALO G IN PU TS BIN ARY IN...
  • Page 40 Phone Jack Figure 18 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. 8-pin 6-pin phonejk Figure 18: Phone Jack Polarization Table 13 defines the pin usage for each jack: Table 13: Phone Jack Pin Identification 8-Pin Jack (UNT to Temperature...
  • Page 41 Sharing a Sensor You may use one sensor as a master input to multiple UNTs, 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.
  • Page 42 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.
  • Page 43 Networking the Controller If you are already familiar with the N2 Bus, go to Installing the N2 Bus. N2 Bus Overview Wiring the A hardware connection between the N2 Communications Bus and the Controller to an Network Control Module (NCM) of the Network Control Unit (NCU) is required if the NCM is to communicate with N2 devices.
  • Page 44 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).
  • Page 45 N2 Wiring to the Network Control Module A N AL O G IN P U T S BIN AR Y IN PU T BINARY OUTPUT NCU (TB1 on 2 3 4 5 6 7 8 ZONE STAT Z B U S Communication 1 2 3 4 5 6 A N AL O G IN P U T S...
  • Page 46 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 22 for terminal locations. Refer to the Metasys Companion Technical Manual (FAN 628.1) for information specific to the MM-CVT101 and the Companion Panel/LTD.
  • Page 47 Table 15: Zone Bus Specifications Specification Description Multidrop serial communications bus Type Speed 1200 baud (bits per second) 18 AWG with shield (Beldon 8760) or Recommended Cable Type 24 AWG with no shield (unshielded telephone cord) 150 m (500 ft) with 18 AWG cable or Maximum Bus Length *30 m (100 ft) with 24 AWG cable Range of Addresses...
  • Page 48 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.
  • Page 49 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 or 1637.5), the UNT Controller section, for detailed information regarding controller configuration.
  • Page 50 120/24 VAC 120 VAC 24 VAC Power RM -T Transformer RM-SP ANALOG INPUTS BINARY IN BINARY OUTPUTS ANALOG CO M Triac to Comm on Relay Jumper 24 VAC Lighting Relay CO M fcwire Figure 24: Fan Coil Wiring Example Bill of Materials Table 19: Fan Coil Bill of Materials Component Part Number...
  • Page 51 Table 20 lists the selections made through HVAC PRO for Windows for Unit Vent the example in Figure 25. Applications Table 20: Unit Vent Parameters and Configuration Selections HVAC PRO for Windows Parameters Configuration Selections ASHRAE Cycle II Control Cycle Dry Bulb Economizer Changeover Heating Type...
  • Page 52 240/24 VAC 240 VAC 24 VAC Power RM-T Transformer RM-SP ANALOG INPUTS BINARY OUTPUTS ANA OUT BINARY IN Triac to 24 VAC BOs High Side COM BUS Switched Relay PNEUM uvwire Figure 26: Unit Vent Wiring Example Bill of Materials Table 21: Unit Vent Bill of Materials Component Description Part Number...
  • Page 53 Table 22 lists the selections made through HVAC PRO for Windows for Packaged the example in Figure 27. Johnson Controls recommends that packaged Rooftop rooftop applications have separate transformers for controller and loads. Applications Sharing of transformers for controller and loads for packaged rooftop wiring is not recommended.
  • Page 54 R: Equipment 24 VAC B: Equipment Ground G: Indoor Blower W 1: Heat-Stage 1 W 2: Heat-Stage 2 Y1: Cooling-Stage 1 Y2: Cooling Stage 2 120/24 VAC 120 VAC 24 VAC Power Room Transformer Sensor Triac Jum per Removed ANALOG INPUTS BINARY OUTPUTS BINARY IN Unit Term inal Strip...
  • Page 55 Bill of Materials Table 23: Packaged Rooftop Bill of Materials Component Part Number AS-UNT110-1 Digital Controller Zone Temperature Sensor TE-6400/6500 Series TE-6300 Series Discharge Air Sensor Outdoor Air Sensor TE-6300 Series Air Flow Switch P32 Series M110CGA-2 Damper Actuator For more information on rooftop installations, refer to Appendix A: Precautions for Rooftop Installations in this technical bulletin.
  • Page 56 120 VAC 24 VAC hpw ire Figure 30: Heat Pump and External Transformer Wiring Example Bill of Materials Table 25: Heat Pump Bill of Materials Component Part Number Digital Controller AS-UNT110-1 TE-6400/6500 Series Zone Temperature Sensor 56 UNT Controller—Unitary (UNT) Controller...
  • Page 57 Downloading/Commissioning Commissioning a UNT begins after the unit is mounted and wired, and the Commissioning control and hardware/software features have been defined through Procedures HVAC PRO for Windows. Refer to the HVAC PRO for Windows User’s Manual (FAN 637.5 or 1637.5) for complete controller configuration and commissioning information.
  • Page 58 58 UNT Controller—Unitary (UNT) Controller...
  • Page 59 Troubleshooting Once the mechanical contractor starts receiving delivery of the UNTs with Hardware factory mounted controls, we recommend that arrangements be made to Installation pull a sample of the shipment for bench testing. This can be done by Inspection loading a job configuration before all the controllers are mounted in the unit cabinets.
  • Page 60 6. Ensure that there are no unwanted earth ground connections to the controller. 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.
  • Page 61 Field Device This section assists you in measuring field wiring which will be terminated Wiring Isolation— to the UNT. If you are confident that the field wiring has no earth grounds, UNTs without an you may go to the following section, Power Transformer Isolation—UNTs Earth Ground without an Earth Ground Connection.
  • Page 62 Power This section will assist you in determining if the supply transformer is Transformer properly isolated. Isolation— • Before connecting the transformer to the UNT, connect the input UNTs without an power to the primary leads of the 24 VAC transformer. Earth Ground Connection •...
  • Page 63 Load Isolation— If the field wires are not yet connected (the Field Device Wiring UNTs without an Isolation—UNTs without an Earth Ground Connection section was Earth Ground skipped), disconnect one 24 VAC wire and terminate the field wires. Connection Reconnect the 24 VAC wire. •...
  • Page 64 24 VAC Line 15 VDC 24 VAC Voltage 24 VAC COM Field Wiring* DVM < 5 VDC/VAC = OK (Isolate 100k ohm DVM > 5 VDC/VAC = Earth Grou 1/4-watt grdloop *AICOM, BICOM, ZBUS COM, AOCOM, BOCOM Figure 34: Testing for Ground Loops •...
  • Page 65 An earth ground connection to the common terminal of the UNT110/111, Grounding UNT110/111, UNT120/121, and UNT140/141 series controllers is allowed for the UNT120/121, and 24 VAC power supply and the binary output/triacs (when set up for high UNT140/141 with side switching). If this earth ground connection exists, it must be at the an Earth Ground transformer secondary common terminal only.
  • Page 66 Table 26: Troubleshooting the UNT with HVAC PRO for Windows Symptom Possible Cause Corrective Action Unit not in Occupied Use the Commissioning mode to Indoor Fan Does Not mode. force the controller into Occupied mode or insert a jumper across the defined, occupied BI if the UNT is already configured to Occupied mode.
  • Page 67 Troubleshoot the N2 Bus if the Companion system is not properly Troubleshooting communicating with the UNTs. Tables 26 and 27 cover many UNT or the N2 Bus N2 communication problems and suggest which actions to take. Specific troubleshooting tests are also given in this section. Before trying one of these tests, you may be able to determine the cause of the problem by asking yourself the following questions: •...
  • Page 68 Notes: For more N2 Bus troubleshooting information, refer to the ASC and N2 Bus Troubleshooting Technical Bulletin in FAN 636.3 or 1628.2. For NCM troubleshooting information, refer to your NCM technical bulletin. There are some errors that may occur while using the HVAC PRO for Zone Bus Windows commissioning tool with the UNTs over the Zone Bus.
  • Page 69 Configuring the Controller All UNTxxx-1 models require HVAC PRO for Windows. HVAC PRO for Using Windows also works with previously released UNT models. This software HVAC PRO for tool configures, commissions, uploads, and downloads the UNT database. Windows Refer to the HVAC PRO for Windows User’s Manual (FAN 637.5 Configuration or 1637.5) for more information on configuring the UNT.
  • Page 70 Highlight UNT in the Add N2 Device dialog box as shown in Figure 36. Hardware -- Add N2 Device Device Type CANCEL D600 DR9100 DX9100 IFC-2020 n2dvc Figure 36: Add N2 Device Dialog Box 7. Click OK. 8. Complete the attribute fields in the UNT Definition window (see Figure 37).
  • Page 71 Table 28 explains the blank attribute fields. The Operator Workstation User’s Manual (FAN 634) describes the general procedures for entering and modifying data. Table 28: Blank UNT Object Attributes Attribute Description Entry Values . . . Identifies the object 1 to 8 alphanumeric Object Name (i.e., UNT1).
  • Page 72 72 UNT Controller—Unitary (UNT) Controller...
  • Page 73 Tables 29-33 list code numbers and descriptions for the UNTs and accessory equipment. Table 29: Controller Code Numbers—Metasys/Companion Code Number Description 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...
  • Page 74 Sensors/ Table 31: UNT Sensors and Transmitters Transmitters Code Number Description Type Electro-Pneumatic 0 to 10 VDC, High Volume EP-8000 Series Transducer 0.5 to 19 psig (relay) HE-6300 Series Wall Mount Humidity 12-30 VDC Supply Transmitter Duct Mount Humidity 18-30 VDC Supply HE-6310 Series Transmitter Metastat...
  • Page 75 Accessories Table 33: UNT Accessories Code Number Description Type AS-CBLPRO-2 HVAC PRO Cable Enclosure for UNT (optional) Sheet Metal AS-ENC100-0 AS-RLY002-0 Relay, 2 SPDT, 5 A, 240 VAC AS-RLY050-0 Relay Kit, 2 SPDT, 5 A, Sheet Metal 240 VAC with enclosure Relay Kit, 4 SPDT, 5 A, Sheet Metal AS-RLY100-1...
  • Page 76 Tables 34 and 35 list preconfigured cables and cable components from Vendor Code Southwest Wire and Windy City Wire. These parts can be ordered through Numbers the Johnson Controls Preferred Supplier Program. Use Table 34 to order preconfigured cables. Table 34: Preconfigured Cables Description...
  • Page 77 Specifications Table 36: General Specifications UNT110-1 / UNT111-1 Product UNT120-1 / UNT121-1 UNT140-1 / UNT141-1 Power Input Requirements 24 VAC, 50/60 Hz at 40 VA (per typical system) Power Draw UNT with sensors/transmitters: 10 VA (400 mA) 25 VA for UNT120/121 (due to heater) Ambient Operating Conditions 0 to 52°C (32 to 125°F) and...
  • Page 78 Table 37: Input/Output Specifications for UNT 110/111 and UNT 140/141 Function Reso- Sampling Accuracy Range DC Input Sensor/ Noise Noise/Surge lution Time Impedance Load Protection* Standard Impedance Tested To* 14 bit 1.5 sec 0-2V 10M ohm 0-5k ohm NM ResCap AI-Voltage ±3.3 mV IEEE-587...
  • Page 79 Appendix A: Precautions for Rooftop Installations Mount the UNT within the rooftop unit or some other enclosure to protect Environmental it from rain, snow, etc. We recommend venting for small enclosures in Information environments that regularly exceed 32°C (90°F). The installation site of the UNT must meet the following environmental standards: •...
  • Page 80 Table 38: Recommended Transformers Transformer Type Power Description 40 VA 120 VAC to 24 VAC Johnson Controls Y65 Series Johnson Controls Y65G13-0 40 VA 24 VAC to 24 VAC 50 VA 120 VAC to 24 VAC Johnson Controls AS-XFR050-0 (insulated split-bobbin...
  • Page 81 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 created 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.
  • Page 82 Rooftop units experiencing nuisance resets require an application upgrade. Nuisance Use HVAC PRO for Windows, Version 6.05 or greater, and the following Resets in procedure: Rooftop Units 1. Run HVAC PRO for Windows, 6.05 or greater. Go to the Upload menu. 3.
  • Page 83 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.
  • Page 84 Rooftop Units containing Gas Ignition Control (see Figure 39 Considerations or Figure 40.) for Gas Ignition 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. 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).
  • Page 85 • 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.
  • Page 86 Line Line Load Load Metal Barrier Figure 39: UNT Directly Driving Loads 86 UNT Controller—Unitary (UNT) Controller...
  • Page 87 Line Line Load Load Metal Barrier Figure 40: UNT with Pilot Relays UNT Controller—Unitary (UNT) Controller 87...
  • Page 88 Lennox models, it may also cause blower 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.
  • Page 89 Table 40: York Rooftop Unit Serial Number/Date Conversion Second Digit Month Third Digit Year UNT Controller—Unitary (UNT) Controller 89...
  • Page 90 90 UNT Controller—Unitary (UNT) Controller...
  • Page 91 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 What’s Different the other UNT types. About the UNT100/101 •...
  • Page 92 Table 41: UNT100/101 Terminal Identification UNT100 Series Controller Terminal Description Terminal Description AI CM Analog Input Common AI 1 Analog Input 1 AI CM Analog Input Common AI 2 Analog Input 2 AI CM Analog Input Common AI 3 Analog Input 3 AI CM Analog Input Common AI 4...
  • Page 93 Grounding and Isolation UNT100/101 Isolation Transformer 120/24 24/24 Power Transformer +15VDC +15VDC ZBUS AREF ZBUS AREF Load 24VAC 24VAC 24VAC 24VAC Contactor 24VAC Isolation 24VAC 24VAC Relay 24VAC 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...
  • Page 94 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.
  • Page 95 Notes UNT Controller—Unitary (UNT) Controller 95...
  • Page 96 Notes Controls Group www.johnsoncontrols.com 507 E. Michigan Street FAN 1628.2 P.O. Box 423 Application Specific Controllers Technical Manual Milwaukee, WI 53201 Printed in U.S.A. 96 UNT Controller—Unitary (UNT) Controller...

This manual is also suitable for:

Unt111-1Unt120-1Unt121-1Unt140-1Unt141-1

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