Page 1: Table Of Contents
Application Specific Controllers Technical Manual 636.3 UNT Controller Section Technical Bulletin Issue Date 0398 Unitary Controller (UNT) Introduction Page • Description • Standards Compliance Configuring the Controller • Using HVAC PRO for Windows Configuration Tool • Defining a UNT Control Device Object •...
Page 2 • Terminal Designations Page • Analog Inputs • Binary Inputs • Binary Outputs (Triac Jumper Information) • Analog Outputs • Zone Bus • Wiring to Unit Mounted Controls--UNT110/111 and UNT120/121 • Wiring to RLY050/002 Relays • Wiring Sensors and Actuators Networking the Controller •...
Page 3 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 •...
Page 4 4 UNT Controller—Unitary Controller (UNT)
Page 5: Unitary Controller (Unt)
Metasys Network through a Network Control Module (NCM) or Companion™. 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.
Page 6: Standards Compliance
Table 1: Unitary Controller Hardware Characteristics-- Similarities Characteristic Description 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.
Page 7: Configuring The Controller
Refer to the HVAC PRO for Windows User’s Manual (FAN 637.5) for Configuration more information on configuring the UNT. Tool In a Metasys Network System, enter data into the Attribute menu to define Defining a UNT a UNT device object. Control Device Object 1.
Page 8 6. Highlight UNT in the Add N2 Device dialog box as shown in Figure 3. +DUGZDUH $GG 1 'HYLFH 'HYLFH 7\SH &$1&(/ ' '&0 '5 '; ,)& /&3 n2dvc Figure 3: Add N2 Device Dialog Box 7. Click OK. 8.
Page 9: Defining A Unt Control Device In Companion Software
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 Defining a UNT Companion Technical Manual (FAN 628.1).
Page 10 10 UNT Controller—Unitary Controller (UNT)
Page 11: 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 12: 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 13 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 14 Do not use this knockout. Otherwise, controller will be in the way of wiring. 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...
Page 15 The UNT can be directly mounted into an EWC10 enclosure. You may UNTxxx-101 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 16: Power Line Wiring Transient Noise Precautions *16
The standard UNT, when powered by any typical separate isolation Power Line transformer or stepdown transformer, operates reliably in an electrical Wiring environment defined as Location Category A by the IEEE 587 Standard; Transient Noise that is, when installed more than 30 feet from electrical distribution Precautions panels or major bus and feeder systems in industrial plants.
Page 17 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 Continuous Only 250V types listed Voltage Rating 30 Joules 55 Joules 80 Joules...
Page 18 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)
Page 19: 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 20 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 21 Table 6: Actuator VA Requirements Actuator Type VA Requirements EDA-2040 (ATP-2040) Incremental 3 VA VA-7150 2.7 VA VA-7152 4.7 VA Incremental or 0-10 VDC 2.7 VA VA-7153 VA-7200 Proportional 5.5 VA VA-7202 7.5 VA VA-7203 5.5 VA VA-8020 Incremental 4 VA Incremental 6 VA VA-8050...
Page 22: Grounding And Isolation Unt110/111, 120/121, 140/141
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 +15VDC...
Page 23: 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 24 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.
Page 25 The UNT terminal designations that identify sensor, actuator, and power Terminal connection points are illustrated in Figures 10, 11, and 41. Terminal Designations 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.
Page 26 ANALOG INPUTS BINARY INPUT BINARY OUTPUT ZONE STAT Z BUS 1 2 3 4 5 6 ANALOG INPUTS 24 VAC COMMON 1 2 3 4 5 6 UNT110 ANALOG INPUTS BINARY IN BINARY OUTPUTS BINARY OUTPUTS ANALOG INPUTS BINARY IN UNT111 BINARY OUTPUTS ANA OUT...
Page 27 Table 7: UNT110/111 and UNT120/121 Terminal Identification 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 Analog Input Common AI 4 Analog Input 4...
Page 28 HIGH TRIAC SWITCHING ZONE ZONE STAT STAT Z BUS 1 2 3 4 5 6 R TN BO2 BO3 R TN BO4 BO5 R TN BO6 BO7 R TN 1 2 3 4 5 6 UNT140 BO6 BO7 AI 1 AI 2 AI 4 AI 6...
Page 29 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 A COM Analog Input Common Analog Input 6 +15 VDC +15 Volts DC Supply Binary Input 1...
Page 30 The six analog input terminals, their power supply, and their common Analog Inputs 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.
Page 31 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 32 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 33 Wiring to Unit CAUTION: Some local electrical codes require the secondary Mounted common of stepdown transformers be connected to Controls-- earth ground (typically on units which are powered by UNT110/111 and greater than 150 VAC). You may have a maximum of UNT120/121 one single earth ground connection, which must be at the transformer secondary common, whether one or...
Page 34 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 BI 3 BI 4 BO4 BO5...
Page 35 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 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.
Page 36 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 RLY050 to the UNT. 3.
Page 37 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 38 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) AI Temperature (Resistive) 152.4 m (500 ft) 30.5 m (100 ft) AI Voltage 152.4 m (500 ft) 30.5 m (100 ft) BI Voltage/Contact...
Page 39 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.
Page 40 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.
Page 41 Temperature Sensors ANALOG INPUTS BINARY INPUT BINARY OUTPUT ZONE STAT Z BUS 1 2 3 4 5 6 ANALOG INPUTS 24 VAC COMMON 1 2 3 4 5 6 ANALOG INPUTS BINARY IN BINARY OUTPUTS CBLPRO 9-pin or 25-pin Adapter untconn Laptop PC Zone Bus...
Page 42 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. 8-pin 6-pin phonejk Figure 21: Phone Jack Polarization The following table defines the pin usage for each jack.
Page 43 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 44 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 45 Network Control Module (NCM) of the Network Control Unit (NCU) 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.
Page 46 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.
Page 47 N2 Wiring to the Network Control Module AN ALOG IN PUT S BIN AR Y IN PU T BI NA RY OUTPUT NCU (TB1 on ZONE STA T Z BU S Communication 1 2 3 4 5 6 AN ALOG IN PUT S BIN ARY C OM C OM MON Terminal Board)
Page 48 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...
Page 49 Table 15: Zone Bus Specifications Specification Description Type Multidrop serial communications bus Speed 1200 baud (bits per second) 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...
Page 50 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 51 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.
Page 52 120/24 VAC 120 VAC 24 VAC Power RM-T Transformer RM-SP ANALOG INPUTS BINARY IN BINARY OUTPUTS ANALOG Triac to Common Relay Jumper 24 VAC Lighting Relay fcwire Figure 27: Fan Coil Wiring Example Bill of Materials Table 19: Fan Coil Bill of Materials Component Part Number Digital Controller...
Page 53 Table 20 lists the selections made through HVAC PRO for Windows for Unit Vent the example in Figure 28. Applications Table 20: Unit Vent Parameters and Configuration Selections HVAC PRO for Windows Parameters Configuration Selections Control Cycle ASHRAE Cycle II Economizer Changeover Dry Bulb Heating Type...
Page 54 240/24 VAC 240 VAC 24 VAC Power RM-T Transformer RM-SP ANALOG INPUTS BINARY OUTPUTS BINARY IN ANA OUT Triac to 24 VAC BOs High Side COM BUS Switched Relay PNEUM uvwire Figure 29: Unit Vent Wiring Example Bill of Materials Table 21: Unit Vent Bill of Materials Component Description Part Number...
Page 55 Table 22 lists the selections made through HVAC PRO for Windows for Packaged the example in Figure 30. 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 56 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 2 120/24 VAC 120 VAC 24 VAC Power Room Transformer Sensor Triac Jumper Removed ANALOG INPUTS BINARY OUTPUTS BINARY IN Unit Terminal Strip 120/24 VAC...
Page 57 Bill of Materials Table 23: Packaged Rooftop Bill of Materials Component Part Number Digital Controller AS-UNT110-1 Zone Temperature Sensor TE-6400 Series Discharge Air Sensor TE-6300 Series TE-6300 Series Outdoor Air Sensor Air Flow Switch P32 Series Damper Actuator M110CGA-2 For more information on rooftop installations, refer to Appendix A: Precautions for Rooftop Installations in this technical bulletin.
Page 58 TE-1 RM-T RM-SP ANALOG INPUTS BINARY IN BINARY OUTPUTS Triac R: Equipment 24 VAC 24 VAC B: Equipment Ground G: Indoor Blower W: Reversing Valve Y: Compressor W1: Heat-Stage 1 Aux1 Aux2 (R1) W2: Heat-Stage 2 Heat Elect. Unit Terminal Strip 120/24 VAC 120 VAC 24 VAC...
Page 59 Via N2 Bus downloading and commissioning over the N2 Bus using MM-CVT101-0, Metasys OWS Release 6.0 or higher, or Companion Release 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.
Page 60 60 UNT Controller—Unitary Controller (UNT)
Page 61 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 62 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 63 Field Device This section assists you in measuring field wiring which will be Wiring Isolation-- terminated to the UNT. If you are confident that the field wiring has no UNTs without an earth grounds, you may go to the following section, Power Transformer Earth Ground Isolation--UNTs without an Earth Ground Connection.
Page 64 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 65 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 66 24 VAC Line 15 VDC 24 VAC Voltage 24 VAC COM Field Wiring* DVM < 5 VDC/VAC = OK (Isolated) 100k ohm DVM > 5 VDC/VAC = Earth Grounded 1/4-watt grdloop *AICOM, BICOM, ZBUS COM, AOCOM, BOCOM Figure 37: Testing for Ground Loops •...
Page 67 Grounding An earth ground connection to the common terminal of the UNT110/111, 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 68 Table 26: Troubleshooting the UNT with HVAC PRO for Windows Symptom Possible Cause Corrective Action Indoor Fan Does Not Unit not in Occupied Use the Commissioning mode to 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 69 Troubleshoot the N2 Bus if the Companion system is not properly Troubleshooting communicating with the UNTs. Tables 26 and 27 cover many UNT or N2 the N2 Bus 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 70 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.
Page 71 Ordering Information Johnson Controls Code Numbers Tables 28 - 31 list code numbers and descriptions for the UNTs and Controllers accessory equipment. Table 28: UNT Controllers and Accessory Equipment 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...
Page 72 Sensors/ Table 29: UNT Sensors and Transmitters Transmitters Code Number Description Type EP-8000 Series Electro-Pneumatic 0 to 10 VDC, High Volume 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 HE-6400 Series...
Page 73 Accessories Table 31: UNT Accessories Code Number Description Type AS-CBLPRO-2 HVAC PRO Cable AS-ENC100-0 Enclosure for UNT (optional) Sheet Metal AS-RLY002-0 Relay, 2 SPDT, 5 A, 240 VAC AS-RLY050-0 Relay Kit, 2 SPDT, 5 A, 240 VAC with enclosure AS-RLY100-1 Relay Kit, 4 SPDT, 5 A, 240 VAC with enclosure Replacement N2 Bus and...
Page 74 Use Table 32 to order preconfigured cables from Southwest Wire. Table 32: Preconfigured Cables, Southwest Wire Description Cable Length Part Number RJ45 Straight-through 7.62 m (25 ft) CBL-STAT25-SW Cable Assembly Plenum • Non keyed plugs 15.24 m (50 ft) CBL-STAT50-SW •...
Page 75 Use Table 35 to order cable components from Windy City Wire for creating your own cables. Table 35: Cable Components, Windy City Wire Description Part Number 304.8 m (1000 ft) Roll of Plenum Rated CBL-24/8STAT-WC • 24 AWG • 8 Conductor •...
Page 76 Use Table 37 to order cable components from Anixter for creating your own cables. Table 37: Cable Components, Anixter Description Part Number 304.8 m (1000 ft) Roll of Non-plenum CM-00424BAG-3 Rated • 24 AWG • 8 Conductor • Solid Wire 304.8 m (1000 ft) Roll of Plenum Rated CMP-00424SAS-3 •...
Page 77 N2 and Zone Bus IEEE 472 Standards Compliance 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...
Page 78 78 UNT Controller—Unitary Controller (UNT)
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 39: Recommended Transformers Transformer Type Power Description Johnson Controls Y65 Series 40 VA 120 VAC to 24 VAC Johnson Controls Y65G13-0 40 VA 24 VAC to 24 VAC Johnson Controls AS-XFR050-0 50 VA 120 VAC to 24 VAC (insulated windings, high noise immunity, resettable breaker) 3.
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. 2. 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 or Considerations 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 Metal Barrier Metal Barrier Figure 39: UNT Directly Driving Loads 86 UNT Controller—Unitary Controller (UNT)
Page 87 Metal Barrier Metal Barrier Figure 40: UNT with Pilot Relays UNT Controller—Unitary Controller (UNT) 87...
Page 88 The following information should be taken into consideration for specific Considerations rooftop units: for Specific Rooftop Units 1. Lennox GCS16 Series Rooftop Units For Lennox GCS16 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.
Page 89 Table 41: York Rooftop Unit Serial Number/Date Conversion Second Digit Month Third Digit Year UNT Controller—Unitary Controller (UNT) 89...
Page 90 90 UNT Controller—Unitary Controller (UNT)
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 42: 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 Controller (UNT) 95...
Page 96 Notes Controls Group www.johnsoncontrols.com 507 E. Michigan Street FAN 636.3 P.O. Box 423 Application Specific Controllers Technical Manual Milwaukee, WI 53201 Printed in U.S.A. 96 UNT Controller—Unitary Controller (UNT)

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