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UNT Controller—Unitary Controller (UNT) 69

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, you may be able to determine the cause of the problem
by asking yourself the following questions:

•

Are the N2 Bus wires securely terminated to each UNT?

•

Is the N2 polarity correct?

•

Is the UNT powered and ready to respond?

•

Have you cycled power on a UNT after changing its address?
(Refer to Installing the N2 Bus in this technical bulletin).

•

Are the UNTs configured properly with the correct number of points?

!

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

Possible Cause

Action

N2 Bus is Offline

EOL jumpers and/or W3
jumper on MM-CVT101 or
Companion Panel/

LTD are not

installed.

Install EOL jumpers and W3
jumper properly.

MM-CVT101 is not plugged
into PC or 9 VDC source.

Plug MM-CVT101 into PC or
into a 9 VDC source.

N2 Bus polarity is incorrect.

Rewire N2 Bus wires for
proper polarity.

UNT Does Not Come
Online

Two or more UNTs have the
same address.

Change each duplicate UNT
address to a unique number.

The address of the UNT was
changed without its power
being cycled afterward.

Cycle power on the UNT.

The 10-second delay after
downloading the UNT has not
yet expired (HVAC PRO™
Revision 1.0 or earlier).

Wait until the delay expires.

Someone is commissioning
over the Zone Bus.

Wait until the Zone Bus is
clear, then try again.

Troubleshooting
the N2 Bus

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Summary of Contents for UNT Series

Page 1: ...l Device in Companion Software 9 Installation Procedures 11 Design Considerations 11 Tools Needed 11 Environmental Information 12 Mounting the Controller 12 Power Line Wiring Transient Noise Precautions 16 I O and Communications Wiring Transient Noise Precautions 18 Wiring Details 19 Power Source and Loads 19 Wiring Precautions 21 Grounding and Isolation UNT110 111 120 121 140 141 22 Grounding and...

Page 2: ...RLY050 002 Relays 35 Wiring Sensors and Actuators 37 Networking the Controller 45 N2 Bus Overview 45 Installing the N2 Bus 46 Zone Bus Communications 48 Application Examples 51 Fan Coil Applications 51 Unit Vent Applications 53 Packaged Rooftop Applications 55 Heat Pump Applications 57 Downloading Commissioning 59 Commissioning Procedures 59 Via Zone Bus 59 Via N2 Bus 59 Indicates those sections w...

Page 3: ... 71 Vendor Code Numbers 73 Specifications 77 Appendix A Precautions for Rooftop Installations 79 Environmental Information 79 Installation Requirements 79 Electrical Noise in Rooftop Units 81 Nuisance Resets in Rooftop Units 82 Considerations for Gas Ignition 84 Considerations for Specific Rooftop Units 88 Appendix B UNT100 101 91 What s Different About the UNT100 101 91 UNT100 101 Terminal Design...

Page 4: ...4 UNT Controller Unitary Controller UNT ...

Page 5: ...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 1 2 3 4 5 6 1 2 3 4 5 6 7 8 BINARY IN ANALOG INPUTS BINARY OUTPUTS DSI 1 2 3 4 5 6 ANALOG INPUTS COMMON ANALOG INPUTS 1 2 3 4 5 6 BINARY INPUT 1 2 3 4 TO ZONE STAT 15VDC REF N2 N2 24VAC COM ZBUS Z BUS 24 VAC 15VDC BINARY OUTPUT 1 2 3 4 5 6 COM...

Page 6: ...ary Controller Hardware Characteristics Differences Characteristic UNT110 1 UNT111 1 UNT120 1 UNT121 1 UNT140 1 UNT141 1 Operating Temperature Rating 0 to 52 C 32 to 125 F 0 to 52 C 32 to 125 F 40 to 52 C 40 to 125 F 40 to 52 C 40 to 125 F 0 to 52 C 32 to 125 F 0 to 52 C 32 to 125 F Analog Outputs 0 to 10 VDC 10 mA None 2 None 2 None 2 Binary Outputs 24 VAC Triacs 0 5A or 0 8A if total power is li...

Page 7: ... 2 Double click the system name to which the new UNT object is to be added 3 On the Item menu click New 4 Select Type N2 devices in the Item New dialog box itemnew OK CANCEL Accumulator Analog data Analog input Analog output digital Analog output setpoint Binary data Binary input Binary output MS data MS input Type MS output Control system DL LR group LC group PID loop Fire Zone L2 devices N2 devi...

Page 8: ...RRU 6 VWHP 1DPH 2EMHFW 1DPH SDQGHG 1 1DPH UDSKLF 6 PERO 2SHUDWLQJ QVWU 7RZHUB Help Item Edit View Action Go To Accessory DUGZDUH 1 7UXQN 1XPEHU 1 HYLFH GGUHVV 3ROO 3ULRULW ODJV XWR LDORXW 1 RPP LVDEOHG 1 DUGZDUH 1 RRNPDUN windobj 817 HILQLWLRQ 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 ...

Page 9: ...ted in the system 1 to 8 alphanumeric characters Expanded ID Further identifies the object i e Garage Level Heater 0 to 24 alphanumeric 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 defin...

Page 10: ...10 UNT Controller Unitary Controller UNT ...

Page 11: ...ibility 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 HVAC PRO for Windows software current release IBM PC ...

Page 12: ...ndensation 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 tra...

Page 13: ... D with the BZ 1000 7 enclosure 229 x 406 x 191 mm 9 0 x 16 0 x 7 5 in H x 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...

Page 14: ...NC100 enclosure kit see Figure 5 use the following procedure 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...

Page 15: ...le Technical Bulletin LIT 6363070 untpwer2 Low Voltage Wiring Trough Figure 6 UNT Premounted in EWC10 with 50 VA Transformer UNTxxx 101 To mount the UNT in the EWC10 use the following procedure 1 Position the terminals of the UNT 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 ...

Page 16: ...t 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 Connect an MOV Metal Oxide Varistor across the UNT supply transformer primary The MOV must ...

Page 17: ...D6321ZOV301RA105 D6521ZOV301RA150 D6921ZOV301RA80 None Mallory VSAC14DK201U VSAC20DK201U VSAC14DK391U VSAC20DK391U VSAC14DK471U VSAC20DK471U VSAC14DK621U VSAC20DK621U Marcon TNR15G211KM TNR23G201KM TNR23G211KM TNR15G391KM TNR23G391JM TNR23G391KM TNR15G471K TNR23G471K None Oneida CKE OZ130LA10A OZ130LA20A OZ130LA20B OZ21L221 0216NR14 3 0216NR20 4 OZ250LA20A OZ250LA40A OZ250LA40B OZ21L471 None Panas...

Page 18: ...ent switching or inductive loads being driven For the N2 Bus the Transient Eliminator model TE JC04C12 made by 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 I O and Communications Wiring Transient Noise Precautions ...

Page 19: ...ower trunk to power multiple controllers follow these precautions Ensure that polarity is maintained at each 24 VAC connection Enclose 24 VAC power trunks with greater than 4 amperes 100 VA in conduit as required by the National Electric Code NEC Do not share a UNT s power transformer with a Companion Panel or any other device with a full wave rectifier in its power supply UNTs use half wave recti...

Page 20: ...ntactor Solenoid Incremental Actuator Maximum allowable load for any individual binary 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...

Page 21: ...hat 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 T 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 AI Binary Input BI Analog Output AO or Bina...

Page 22: ...ure 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 CAUTION You may have a maximum of one single earth ground connection which must be at the transformer secondary common wheth...

Page 23: ...4VAC 24VAC N2 RE F N2 ZB US COM 24VAC 15VDC 15VDC L1 L2 To Load Contactor isoxfmr Shared Triac Node Discard small wire jumper L1 L2 Optional Earth Ground To UNT COMMON Only UNT Power Transformer 120 24 Load Power Transformer 120 24 COM ZBUS REF N2 N2 BO1 BO2 Note UNT110 is shown in illustration Diagram is for all UNT models 70 COMM ON COMM ON COMM ON Triac 24VAC Figure 8 Transformer Wiring Diagram...

Page 24: ...he controller 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 t...

Page 25: ... connections to the UNT by connecting single wires to the individual screw or spade terminals Note The N2 terminal connectors on the new UNTxxx 1 series controllers are different from the UNTxxx 0 series The REF N2 and N2 terminations are arranged in different order see Figure 9 24VAC COM ZBUS REF N2 N2 Triac BO1 BO2 BO3 24 V ZBUS AREF N2 N2 UNTxxx 0 UNTxxx 1 compare Figure 9 N2 Terminal Connector...

Page 26: ...INPUTS COMMON 1 5VDC TO ZONE STAT BINARYOUTPUT 24VAC 1 2 3 4 5 6 15VDC 24 VAC COMMON CO MMON REF N2 N2 24VAC COM ZBUS Z BUS DSI 7 8 TRACS 24 VAC 1 2 3 4 5 6 COMMON COMMON CO MMON BINARY IN ANALOGINPUTS BINARYOUTPUTS AI CM AI 1 AI CM AI 2 AI CM AI 3 AI CM AI 4 AI CM AI 5 AI CM AI 6 15 VDC 15 VDC 24 VAC BI 1 BI 2 BI 3 BI 4 BO 1 24VAC BO 2 BO 3 BO 4 BO 5 BO 6 COMMON TRIACS COMMON 24 VAC 24 VAC 24 VAC...

Page 27: ...lts DC Supply 24 VAC 24 Volts AC BI 1 Binary Input 1 24 VAC 24 Volts AC BI 2 Binary Input 2 24 VAC 24 Volts AC BI 3 Binary Input 3 24 VAC 24 Volts AC BI 4 Binary Input 4 24 VAC POWER Transformer High Side COMMON Transformer Low Side ZBUS Zone Bus REF N2 Reference N2 N2 Bus N2 N2 Bus 24 VAC 24 Volts AC BO 1 Binary Output 1 24 VAC 24 Volts AC BO 2 Binary Output 2 TRIACS Shared Triac Node BO 3 Binary...

Page 28: ... RTN RTN RTN RTN AI1 AI2 AI3 AI4 AI5 AI6 BI1 BI2 BI3 BI4 BO1 BO2 BO3 BO4 BO5 BO6 BO7 BO8 A COM A COM A COM 15 VDC 24 VAC 24 VAC TR IAC RTN RTN RTN RTN BO6 BO7 BO8 BO6 BO7 BO8 RTN N RTN Triac Jumper Connector scrtrm2 UNT141 DSI COM Z BUS 24 VAC REF N2 N2 AI1 AI3 AI4 AI5 AI6 15 VDC 24 VA C BI2 BI3 BI4 BO1 BO2 BO3 BO4 BO5 BO6 AO1 AO2 A COM AI2 A COM A COM BI1 24 VA C TR IAC RTN RTN RTN AI1 AI2 AI3 AI...

Page 29: ... BI4 Binary Input 4 TRIAC Shared Triacs Node BO1 Binary Output 1 RTN Return 24 VAC or Common BO2 Binary Output 2 BO3 Binary Output 3 RTN Return 24 VAC or Common BO4 Binary Output 4 BO5 Binary Output 5 RTN Return 24 VAC or Common BO6 Binary Output 6 BO7 or AO1 Binary Output 7 or Analog Output 1 RTN or A COM Return 24 VAC or Common or Analog Output Common BO8 or AO2 Binary Output 8 or Analog Output ...

Page 30: ...sition 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 Temperature T 1 000 ohm Nickel Platinum Silicon 2k ohm potentiometer SW1 to Position T and SW2 to Position 2V The UNT has two sets of DIP switches One set is for configuring the analog input points and the other set is for setting the controller address Us...

Page 31: ...tes 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 ...

Page 32: ...trollers 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 M100C series actuators CBLPRO for HVAC PRO for Windows commissioning and the Zone Termi...

Page 33: ...stepdown transformer as common L1 L2 Unit Mounted Control Enclosure See the Application Examples section for more information UNT Controller Triac Switching ZBUS REF N2 N2 COM 24 VAC COM 24 VAC LED Internal Shared Triac Node COMPRESS Comp Relay Heat Relay Fan Relay 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...

Page 34: ...unit mounted controls OEMs typically minimize wiring between digital controls and equipment interface relays by using one leg of the stepdown transformer as common 24 VAC L1 L2 Unit Mounted Control Enclosure COM 24 VAC B04 B02 B01 UNT Controller Triac Switching Internal Wiring Connections COMPRESS Comp Relay Heat Relay Fan Relay Stepdown Transformer HEAT FAN COMMON See CAUTION for Wiring to Unit M...

Page 35: ...AI CM AI 5 AI CM AI 6 15VDC 24 VAC BI 1 BI 2 BI 3 BI 4 15VDC BO 1 24VAC B O 2 BO 3 BO 4 BO 5 BO 6 COMMON TRIAC BO 7 COMMON COMMON COMMON COMMON BO 8 24 VAC 24 VAC 24 VAC 24VAC A B COM NC NO COM NC NO unt1ahu AS RLY050 0 AS RLY002 0 A B COILS TRIAC HAND OFF HOA COM Note 3 Jumper Low Voltage High Voltage See Note 1 Note 1 Separate low voltage wiring on the left from line voltage wiring on the right ...

Page 36: ...O 6 COMMON TRIAC BO 7 COMMON COMMON COMMON COMMON BO 8 24 VAC 24 VAC 24 VAC 24VAC unt2ahu Low Voltage High Voltage See Note 1 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 ...

Page 37: ...ld be less than 3 0 ohms CAUTION Do not run AI BI AO BO ZBUS or N2 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 in...

Page 38: ...NARY IN ANALOG INPUTS BINARY OUTPUTS 70 BINARY INPUT ANALOG INPUTS 1 2 3 4 5 6 1 2 3 4 ANALOG INPUTS COMMON 15VDC TO ZONE STAT BINARY OUTPUT 24VAC 1 2 3 4 5 6 15VDC 24VAC COMMON COMMON REF N2 N2 24VAC COM ZBUS Z BUS DSI 7 8 TRACS 24 VAC 1 2 3 4 5 6 COMMON COMMON COMMON untm100c M100 Motor with R81CAA 2 Board HVAC PRO for Windows indicates the needed address COM T1 T2 BUS CW CCW ZBUS COM COM 24 VAC...

Page 39: ...s when wiring an M100C actuator untm100e A91 Mixed Air Sensor 15 000 ohms T1 B2 NC NO C A C B 10 8 9 S1 S2 T2 Y45AA 9 Temp 10 8 T1 9 X T2 10 8 9 X T1 T2 B1 Damper Command Minimum Position Override X B3 BO7 COMMON BO8 BINARY IN ANALOG INPUTS BINARY OUTPUTS R81EAA 2 Outdoor Air Damper Control M100J for Return Air Damper M100J for Exhaust Air Damper Power Transformer 120 24 VAC Power Transformer 120 ...

Page 40: ...rd to 10 volts Switch 1 OFF Switch 2 ON 2 Enter the range of the humidity sensor through HVAC PRO for Windows 0 to 10 VDC is equal to 0 to 100 RH unthe Analog Input DIP Switch Setting ANALOG SW2 SW1 HE 6300 Humidity Sensor 1 2 3 4 5 6 O N 1 2 3 4 5 6 O N BINARY IN ANALOG INPUTS BINARY OUTPUTS DSI PWR OUT COM Figure 19 Example of HE 6300 Humidity Sensor Connection HE 6300 Humidity Sensor ...

Page 41: ...eries 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 connect...

Page 42: ... Temperature Sensor 6 Pin Jack UNT140 Controller to CBLPRO or ZT and CBLPRO or ZT to Temperature Sensor Pin Signal Pin Signal 1 AI 3 Heating Setpoint 1 Not Used 2 AI 2 Warmer Cooler or Cooling Setpoint 2 24 VAC 3 AI 1 Temperature Sensor 3 24 VAC ZnBs Common 4 AI 1 Sensor Common 4 Not Used 5 24 VAC 5 Zone Bus 6 24 VAC ZnBs Common 6 Not Used 7 AI 2 3 Common 8 Zone Bus Notes When using the Metastat d...

Page 43: ...5 6 15VDC 24VAC COMMON COMMON REF N2 N2 24VAC CO M ZBUS Z BUS DSI 7 8 TRACS 24 VAC 1 2 3 4 5 6 COMMO N COMMON COMMON 1 2 3 4 5 6 1 2 3 4 5 6 7 8 BINARY IN ANALOG INPUTS BINARY OUTPUTS 70 BINARY IN PUT ANALOG INPUTS 1 2 3 4 5 6 1 2 3 4 ANALOG INPUTS COMMON 15VDC TO ZONE STAT BINARY OUTPUT 24VA C 1 2 3 4 5 6 15VD C 24VAC C OMMON COMMON REF N 2 N2 24VAC COM ZBU S Z BUS DSI 7 8 T RACS 24 VAC 1 2 3 4 5...

Page 44: ...ensor 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: ...rcuitry 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 len...

Page 46: ...ed 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 000...

Page 47: ...Since the UNT is a self terminating device end of line termination for the N2 Bus is not required N2 REF N2 N2 N2 N2 N2 REF NCU TB1 on Communication Terminal Board HRD GRD SFT GRD N2 N2 REF SFT GRD REF N2 N2 n2wire a Figure 24 Connecting the UNT Controller to an NCM Table 14 Terminal Locations TB1 Terminal Function Number UNT Connection Chassis Ground 6 None Soft Ground 5 None N2 Ref 4 REF Soft Gr...

Page 48: ...N2 N2 To Next N2 Device N2 REF N2 N2 Companion PC Version N2 N2 N2 REF 9 VDC 9 V COM MM CVT101 0 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 The Zone Bus is a ...

Page 49: ...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 Green LED Cause Off No power to ASC On Zone Bus shorted to common or 24 VAC Blinking Normal Communication The AS CBLPRO is an interface device used between a computer running HVAC PRO...

Page 50: ... with an AS CBLCON 0 This device has red and green LEDs whose purposes are described in Table 17 Table 17 CBLCON LED Description Red LED Power Green LED Comm Cause Off Off No power to UNT On Off Zone Bus wire open On On Zone Bus wire shorted to common or CBLCON 0 switch in download position On Blinking Normal communications Refer to the Application Specific Controllers Technical Manual FAN 636 3 t...

Page 51: ... 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 HVAC PRO for Windows Parameters Configuration Selections Heating Type Common Heating Cooling Coil Lighting Integration Yes FCMECH Return Air Discharge Air TE1 C1 R1 VA1 Fig...

Page 52: ...Fan Relay Power Transformer 120 24 VAC TE1 RM T RM SP ON COM OFF AC COM IN 1 2 3 IN 24 VAC Figure 27 Fan Coil Wiring Example Table 19 Fan Coil Bill of Materials Component Part Number C1 Digital Controller AS UNT111 1 TE1 Zone Temperature Sensor TE 6400 Metastat VA1 Valve Actuator VA 8052 Valve Actuator Assembly R1 Lighting Relay GE RR7 Bill of Materials ...

Page 53: ...n Selections HVAC PRO for Windows Parameters Configuration Selections Control Cycle ASHRAE Cycle II Economizer Changeover Dry Bulb Heating Type Proportional Unoccupied Override of Heating Valve Yes Cooling Type None Lighting Integration None uvmech Outdoor Air Discharge Air Return Air EP 1 C 1 TE 3 TE 2 TE 1 DA 1 Figure 28 Unit Vent Mechanical Flow Diagram Unit Vent Applications ...

Page 54: ...nsformer 240 24 VAC Fan Relay COM IN COM S 20 Figure 29 Unit Vent Wiring Example Table 21 Unit Vent Bill of Materials Component Description Part Number C1 Digital Controller AS UNT111 1 TE1 Zone Temperature Sensor TE 6400 Series TE2 Outdoor Air Sensor TE 6300 Series TE3 Discharge Air Sensor TE 6300 Series EP1 Electric to Pneumatic Interface EP 8000 Series DA1 Zone Damper Actuator M100CGA 2 Bill of...

Page 55: ...oftop Parameters and Configuration Selections HVAC PRO for Windows Parameters Configuration Selections Economizer Output Type Zone Bus Economizer Changeover Type Dry Bulb Heating Type Two Stages Cooling Type Two Stages Outdoor Air Lockout of Heating Cooling Yes Zone Reset from Humidity No Heating Cooling Diagnostics Yes Lighting Interface No Air Flow Interlock Yes prmech 7 TE 3 6 TE1 C 1 Exhaust A...

Page 56: ...Sensor TE2 TE3 120 VAC 24 VAC 120 24 VAC S1 24 VAC 24 VAC 24 VAC DA1 COM BUS 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 Phase correctly and size the transformer to include 20 VA for the M100C series actuator Unit Terminal Strip Triac Jumper Removed R Y Power Transformer 120 24 VAC T1 T2 R B G W1 W2 Y1 Y2 24VAC COM ZBU...

Page 57: ...tions 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 HVAC PRO for Windows Parameters Configuration Selections Heat Pump Type Water to Air Reversing Valve Action On for Heating Supplemental Heat Two Stages Light...

Page 58: ...NARY IN ANALOG INPUTS BINARY OUTPUTS TE 1 RM T RM SP 120 VAC 24 VAC 120 24 VAC Unit Terminal Strip Triac to 24 VAC Aux1 Elect Aux2 Heat R1 R B G W Y W1 W2 Figure 33 Heat Pump and External Transformer Wiring Example Table 25 Heat Pump Bill of Materials Component Part Number C1 Digital Controller AS UNT110 1 TE1 Zone Temperature Sensor TE 6400 Series Bill of Materials ...

Page 59: ...O 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...

Page 60: ...60 UNT Controller Unitary Controller UNT ...

Page 61: ...MM Steps 1 Connect 100k ohm resistor under plug s prongs 2 Insert banana plug into DMM 3 Connect leads of DMM into banana plug Figure 34 Double Banana Plug Used with 100k ohm Resistor Review the mounted UNT and compare it with the appropriate illustrations in the Installation Procedures section of this technical bulletin to ensure proper installation Also refer to the engineering drawings supplied...

Page 62: ...the UNT are intended or to ensure that there is only one earth ground connection This section will help you ensure proper isolation within your system These procedures are not required but are recommended to reduce installation errors To ensure proper isolation test the following field device wiring for proper isolation transformer for isolation and correct polarity termination connected field dev...

Page 63: ...e 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 great...

Page 64: ...rth ground and protect system components Wire a separate 24 VAC to 24 VAC 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 completely isolated circuit Line Voltage 24 VAC transfm1 100k ohm 1 4 watt DVM 100k ohm 1 4 watt DVM Figure 36 Testing the Transformer Determine the polarity ...

Page 65: ...sting other points 1 Remove all the field wires and N2 Bus wires from the UNT but leave the transformer wires attached 2 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 tran...

Page 66: ... 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 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 t...

Page 67: ... use the procedure described above for the UNT100 101 controller to test for the presence of a ground loop condition 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 Table 26 indicates symptoms and corrections for possible controller malfunctions We recommen...

Page 68: ...wire from Zone Bus on UNT is connected to bus terminal on actuator Check address of the M100C actuator it should be 22 Heating or Cooling Will Not Turn On Automatically Zone Sensor not connected Zone temperature not above below setpoint Heating or cooling lockout from outdoor temperature Delay timers present Ensure Zone Sensor is properly connected with an 8 pin plug to the UNT Simulate a load at ...

Page 69: ...ing 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 Possible Cause Action N2 Bus is Offline EOL jumpers and or W3 jumper on MM CVT101 or Companion Panel LTD are not installed Install EOL jumpers and W3 jumper properly MM CVT101 is not plugged into PC or 9 VDC source Plu...

Page 70: ...troller 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 sam...

Page 71: ...eater for low temperature use AS UNT121 1 UNT111 controller with heater for low temperature use AS UNT140 1 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 UNT11...

Page 72: ... 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 3 4 in 1 in and 1 1 2 in 24 VAC Triac Incremental VA 8051 Series Valve Actuator Assemblies 1 2 in 3 4 in 1 in and 1 1 2 in 24 VAC Triac Incremental with Feedback VA 8052 Series Valve Actuator Ass...

Page 73: ...1 Momentary Button Kit for Temporary Occupancy or Boost Modes for TE 6100 11 12 only N A MM CVT101 0 RS 232 RS 485 Converter for N2 Download Commissioning with HVAC PRO for Windows N A WS WINPRO 0 HVAC PRO for Windows Software N A WS WINPRO 6 HVAC PRO for Windows Software Upgrade N A Y65XX X Series Transformer 24 120 220 277 480 VAC to 24 VAC AS XFR050 0 Transformer 50 VA P32 Series Air Flow Switc...

Page 74: ... Wire Description Part Number 304 8 m 1000 ft Roll of Plenum Rated 24 AWG 8 Conductor Solid Wire CMP 00424SAS 3 RJ45 Modular Plugs S100710 Premium Economy Crimp Tool S104012 Twisted Pair Easy Strip S104020 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 prec...

Page 75: ... 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 Description Cable Length Part Number RJ45 Straight through Cable Assembly Non plenum 7 62 m 25 ft Q1093 307 25 Non keyed plugs 15 24 m 50 ft Q1093 307 50 24 AWG 8 Cond...

Page 76: ...omponents Anixter Description Part Number 304 8 m 1000 ft Roll of Non plenum Rated 24 AWG 8 Conductor Solid Wire CM 00424BAG 3 304 8 m 1000 ft Roll of Plenum Rated 24 AWG 8 Conductor Solid Wire CMP 00424SAS 3 8 Position Non keyed Plugs for Solid Cable bag of 25 074683 Stewart Hand Tool with 8 Position Die Set for Solid 24 AWG Wire 060612 ...

Page 77: ...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 H x W x D 165 x 163 x 56 mm 6 5 x 6 4 x 2 2 in 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 lb Processor 80C652 Memory 32K RAM 64K ROM 8K EEPROM Interfaces N2 and Zone Bus Standards Compliance IEEE...

Page 78: ...78 UNT Controller Unitary Controller UNT ...

Page 79: ...e 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 thi...

Page 80: ...er 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 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 conditi...

Page 81: ...tion 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 loa...

Page 82: ...ion 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 power connec...

Page 83: ...mmediately 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 For units meeting both conditions install transient voltage protectors in both locations as described above Figure 38 Installation of MOV ...

Page 84: ...h enough energy to ignite main gas valve burners 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...

Page 85: ...e 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 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...

Page 86: ...86 UNT Controller Unitary Controller UNT UNT Metal Barrier Metal Barrier Y2 Figure 39 UNT Directly Driving Loads ...

Page 87: ...UNT Controller Unitary Controller UNT 87 UNT Y1 G R Metal Barrier Metal Barrier Load Line Flame Sensing Figure 40 UNT with Pilot Relays ...

Page 88: ...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 thi...

Page 89: ...ler Unitary Controller UNT 89 Table 41 York Rooftop Unit Serial Number Date Conversion Second Digit Month Third Digit Year A 1 A 92 B 2 B 93 C 3 C 94 D 4 D 95 E 5 E 96 F 6 F 97 G 7 G 98 H 8 H 99 K 9 L 10 M 11 N 12 ...

Page 90: ...90 UNT Controller Unitary Controller UNT ...

Page 91: ...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 untrm100 BINARY IN BINARY OUTPUTS 1 5 1 1 2 13876 1 2 13876 20021 1 5 20 9 20 3 5 1 9 1 5 287387 9 72 2 6 9 1 2 2 873 8 7 1 2 287387 20021 70 O F F 1 ...

Page 92: ...ommon BI 1 Binary Input 1 BI CM Binary Input Common BI 2 Binary Input 2 BI CM Binary Input Common BI 3 Binary Input 3 BI CM Binary Input Common BI 4 Binary Input 4 24 VAC POWER Transformer High Side 24 VAC COMMON Transformer Low Side ZBUS Zone Bus AREF N2 Reference and ZBUS Common N2A N2 Bus N2A N2 Bus 24 VAC 24 Volts AC BO 1 Binary Output 1 24 VAC 24 Volts AC BO 2 Binary Output 2 24 VAC 24 Volts ...

Page 93: ...AUTION 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 terminals 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 ...

Page 94: ... 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 controllers are inactive when open or a 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 accu...

Page 95: ...UNT Controller Unitary Controller UNT 95 Notes ...

Page 96: ...Controller Unitary Controller UNT 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 ...

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