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Trane CNT-SVX07C-EN User's Manual

1. occupied p 4 4 open occupied WAR 1 i Heating valve Condensate overflow closed normal mor 0 65 1 UNE 1 roa bu dud 2 ord 24 Low coil temperature detection MEME bod _ Outdoor air damper actuator closed normal E Pod x ___ 24 Vt 24 Vac 4 a 5 5 8 Generic baseboard heat 2 rr 1 r uu G 24V 2020 Lend m m 12 3 4 5 6 7 8 9 10 staTUS AC POWER BINARY INPUTS BINARY OUTPUTS cu Un c Ot TRARNE cu Tracer ZN 521 OS Os cu Os ZONE SENSOR ANALOG INPUTS 5 SERVICE COMMS LED GND SET FAN AI2 AIS 20 AM
2. Fan status closed on Occupancy open occupied i i 24 Vt oe i i i dg Electric heat stage 1 Condensate overflow closed normal EMEN 24 1_ oO i Electric heat stage 2 d NE i Q r 24 Low coil temperature detection AE Outdoor air damper actuator closed normal M MEME EE re mt id od dog Pod Fog Em 24vt 24Vac Oodd POP dog Pod SEE S Generic baseboard heat Ni ssas TEE bod QO ER bug d 1 1 DO X pb eeo o o e oeee ooe 0 A GND 24V 2020 Len Lia Ls A 1 2 3 4 5 6 9 10 Sms AC POWER BINARY INPUTS BINARY OUTPUTS OS cui LIES cu IL we TRANE Tracer ZN 521 OS cu LLA ZONE SENSOR ANALOG INPUTS COMM5 SERVICE COMM5 S PIN LED GND SET FAN ox 2 20 ono B LED h m i pooooegog ao o tote GN E k A E M See 777777777 EN E hot ob FFiguresband6 1
3. 24 Vi Condensate overflow closed normal mE i Auxiliary heating valve oi 1 i 15 d on Low coil temperature detectio yt oa 4 1 Outdoor air damper actuator closed normal oco tot 1 TE or dod Pob xs 2 Loi d p o4 peo 24 Vt 24 No 59 5 8 Generic baseboard heat 1 1 1 1 ioa H 1 1 Q Q iQ iQ Oi 1 pog pad oo 5 160206660006 0000060000 FT uuum mmm on oo 24V 24V Len PN PN Len 1 2 3 4 5 6 7 8 9 10 SUUS AC POWER BINARY INPUTS BINARY OUTPUTS cu Ot OS cx Tix AV que 5 N Tracer ZN 521 Oi Olt ZONE SENSOR ANALOG INPUTS 5 COMM5 0 PIN LED GND SET FAN GND 2 20 B LED 05 050 05 050 eeeoeeeod eeeeeoooce CNT SVX07C EN
4. G 24V Lan se AC POWER BINARY BI3 BI4 1 2 3 4 5 6 7 8 9 10 STATUS INPUTS BINARY OUTPUTS RANE Tracer ZN 521 ZONE SENSOR ANALOG INPUTS 5 SERVICE 5 PIN LED GND SET FAN Al2 20 LED nn L3 F3 nom EJ m EJ 30 150 Entering water LonTalk temperature CNT SVX07C EN 4 4 LonTalk Al4 input See 7 77 Figures 5 and 6 n lonpage20for i Wiring options out 1 1 1 1 1 1 1 1 1 1 1 Outdoor air generic temperature All binary inputs are configurable t Connect 24 V to an AC POWER 24V terminal Discharge air temperature 31 S
5. GND 24V 24V 20 Laial CBI2 CBB PA 1 2 3 4 5 6 7 8 9 10 STATUS POWER BINARY INPUTS BINARY OUTPUTS cu 4 en Tracer ZN 521 cu ZONE SENSOR ANALOG INPUTS COMM5 SERVICE 5 PIN LED GND SET FAN ong Al2 20 A B B LED LI leeeeeeeesd eeeeeecec LonTalk input See I 7777777777 in Figures5and6 1 11 ton page 20 for wiring options Oe sl eae ss et Cancel Q gO Entering water LonTalk temperature Discharge air temperature Outdoor air or generic temperature All binary inputs are configurable t Connect 24 V to an AC POWER 24V terminal T T 1 1 1 1 1 1 1 1 1 1 1 O 32 CNT SVX07C EN Wiring requirements and options Figure 17 Four pipe heating cooling unit with face and bypass damper non 24 Mf Fan highspeed Exhaust or fan medium speed LU GE dumme 24 Vt Occupancy open occupied Condensate overflow closed Low coil temperature detection closedznormal Fan status closed on oo normal T T 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Fan low speed m o
6. 2 ECC IR Pm 2 Agency 1 4 Additional 1 lt 4 Power 4 Water duct and outdoor air temperature sensors 4 Binary input switching devices 4 Output devices 1 ehh 4 Zone temperature sensors 4 Valve 4 Damper 5 Zone humidity 5 COD SENSOM EE 5 General wiring information 7 Input output terminal wiring 7 AC power 7 Communication link wiring and addressing 9 Mounting the controller 11 Location 5 11 Operating environment requirements 11 Mounting 12 Input output functions and wiring for typical lt 13 Binary cce E eee 14 Low coil temperature detection
7. Test button Neuron ID label Red service LED Tracer ZN 521 Service pin button THE TRANE COMPANY 2000 AMER STD INC Y 7 Yellow 220200820 leeeeeeeee CNT SVX07C EN 51 S Chapter 6 Status indicators for operation and communication 52 Manual output test The manual output test sequentially turns on and off all binary outputs to verify their operation The test overrides normal operation of the con troller which is suspended while the test is being performed Use the manual output test to e Verify output wiring and operation Force the water valve s open to balance the hydronic system e Clear diagnostics and restore normal operation although not a pri mary function of the manual output test The manual output test is performed either by repeatedly pressing the Test button to proceed through the test sequence or by using the Rover service tool Table 11 on page 53 lists the outputs for non face and bypass unit configurations in the sequence in which they are verified Table 12 on page 55 lists the outputs for face and bypass unit configurations in the sequence in which they are verified The procedure is as follows 1 Press and hold the Test button for 3 to 4 seconds then release it to start the test mode The green status LED goes off when you press the Test button and then it blinks as des
8. 37 Timed override control 37 Zone temperature 38 Cascade zone 38 Simplified zone control 38 Discharge 1 39 Morning 39 Morning 39 Heating or cooling mode 39 Entering water temperature sampling function 40 usse hated eke i x TR ale a eee 40 Exhaust enn 41 Valve 42 Modulating valve 42 Modulating valve 42 Two position valve operation 43 Isolation valve 43 Two pipe 43 Four pipe operation 43 CNT SVX07C EN CNT SVX07C EN Chapter 6 Contents Modulating outdoor return air 43 ASHRAE Cycle 1 conformance 45 ASHRAE Cycle 2 co
9. Wiring requirements and options Figure 13 Electric heat unit with DX cooling 24 Vt i Fan high speed Q 24 Vt Exhaust Fan status closed on oo r 24V DX cooling Occupancy open occupied m ro 24 Vt Electric heat stage 1 optional Condensate overflow closed normal 1 r7724 Vt 05 1 7 Electric heat stage 2 optional 3 24 Vt Low coil temperature detection EE air damper actuator closed normal Se de uo on i d T Pt rot 77 241 24 NONE od cg Generic baseboard heat 1 1 1 1 1 1 1 1 1 1 iQ eeeeeeoeeo ZEATE u ar tr ira G 24 24V 24V Laed Lasd pu 1 2 3 4 5 6 7
10. m Outdoor air or vA generic temperature All binary inputs are configurable Connect 24 V to an AC POWER 24V terminal CNT SVX07C EN 25 S Figure 10 Four pipe hydronic heating cooling unit Chapter 4 Input output functions and wiring for typical applications 24Vts Fan high speed 24 Vt Exhaust or fan medium speed 24V Fan low speed e Fan status closed on oo Occupancy open occupied 4 Cooling valve oo r 24 Vt Condensate overflow closed normal _ Heating valve oa Outdoor air damper actuator Low coil temperature detection open normal o o x NL
11. eee 58 Types of diagnostics 58 Manual latching 58 Automatic nonlatching 58 Smart reset 59 Informational 59 Table of lt 59 Contents CNT SVX07C EN S CNT SVX07C EN Chapter 1 Overview and specifications This guide provides installation and configuration information for the Tracer ZN521 zone controller as well as a description of its operations The overview includes a product description specifications and descrip tions of ancillary products that may be necessary Product description The Tracer ZN521 is an application specific controller that provides direct digital zone temperature control The controller can operate as a stand alone device or as part of a building automation system BAS Communication between the controller and a BAS occurs by means of a LonTalk communication link which complies with the LonTalk protocol The Tracer ZN521 supports the following equipment Fan coils Unit ventilators e Blower coils The Tracer ZN521 can be configured to control e Tri state modulating or two position valves Tri state modulating dampers outdoor return air and face and bypass DX cooli
12. 14 812 Condensate 14 Occupancy or generic binary 15 Fan status 15 Contents Chapter 5 Analog inputs cee nn 16 GND Ground 58 16 ZN Zone temperature 16 SET Local setpoint un ne un nn rcm an mee nd 17 FAN Fan mode 17 Entering water temperature 17 Al2 Discharge air temperature 18 Al3 Outdoor air temperature or generic temperature 18 Universal 4 20 19 Binary 0 a aa a hr 21 Generic binary 21 Overriding binary 22 Wiring requirements and options 22 Sequence of operations 35 Powerup 5 35 Random start casio neta qu tace de 35 Occupancy 36 Occupied mode iius uu emu ge bak eed e RC cx E 36 Unoccupied 36 Occupied standby mode 36 Occupied bypass mode
13. c is ON Ec S2 8 oo Sa coo o 2 E 5 gt 25 a es 5 zo gt E o 52 BE oo 58 oL 5 2 i Es z St E 59 o T 1 os oo o oo S E 5 uu 5 55 gt 95 3 3 UN uL 1 Begins test Off Off Off Off Off Off On Close Off On Close Of mode 2 Fan high On High Off Off Off On Open Off Off Off Off Of 3 Fan Off 1 On Med Off Off On Open Off Off Off Off Of medium 2 Off 4 Fan low Off Off On Low Off On Open Off Off Off Off of Main open On High Off Off On Open On Open Off Off Off Off of DX on 6 Main close On High Off Off Off On Open On Open Off Off Off of DX off aux open 7 Aux open On High 1 Off Off Off On Open On Open Off Off Off of EH1 on 2 On exhaust fan 8 Aux close On High Off Off Off Off Off On Close On Open Off Of damper open 9 Outdoor air On High Off Off Off Off Off On Close Off On Close ofi damper close 10 Generic On High Off Off Off Off Off On Close Off Off Or baseboard heat energized 11 Exit 1 2 3 The controller turns off all fan and electric heat outputs and drives all dampers and valves closed The controller attempts to clear all diagnostics If configured for a 3 speed fan the medium fan speed output will energize at step 3 If configured for a 2 speed fan the fan remains on higl at step 3 If configured for a 3 speed fan the medium fan speed output e
14. 24 Vac bo ge X 3 5 159 O Generic baseboard heat MEE ES poro pod y 220006600006 ooo 6000 Bee LT LS L4 eee Pua ove zav Len Lp 1 2 4 5 6 7 9 10 STATUS AC POWER BINARY INPUTS BINARY OUTPUTS LA cu OS Ot UB RAIN D ao ANT 109 Tracer ZN 521 OS OS Un C ZONE SENSOR ANALOG INPUTS COMM5 SERVICE 5 PIN LED GND SET FAN 2 20 AM ew A B LED 1 DU gt leeeeeeeee ae WE LN ud p wc d input See 77777777 in tod od d E NM iFigures5and6i 1 Qo 1 1 920 uo PP db baring options lt a eu EO Entering water La Outdoor air or pom temperature Lad bog generic temperature H Discharge air temperature All binary inputs are configurable Connect 24 V to an AC POWER 24V terminal 26 CNT SVX07C EN gt TRANE Wiring requirements and options Figure 11 Four pipe heating cooling unit with auto changeover 24V Fan high speed 24 Vt Exhaust or fan medium speed Fan status closed on oo Occupancy open occupied 24 Vt Heating cooling changeover valve vt 24 Vt Fan low speed
15. LLA ZONE SENSOR ANALOG INPUTS COMM5 SERVICE COMM5 NN PIN LED GND SET FAN ow Alt 12 20 A B A B LED 0 0 2 260860860 m LonTalk input See 7 Figures 5 6 di in 20 wiring options out oe noes s 4 t 1 1 1 1 1 1 1 1 1 1 1 1 pjscscseeneeluasssssad4 Outdoor air generic temperature P 1 T 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Q HO Entering water temperature 6 Discharge air temperature All binary inputs are configurable Connect 24 V to an AC POWER 24V terminal CNT SVX07C EN 23 S Chapter 4 Input output functions and wiring for typical applications Figure 8 Two pipe hydronic heating unit 24Vi Pr Fan high speed 24 Vt Exhaust fan medium speed en Fan low speed Fan status closed on 24 Vt
16. Installation and Operation Tracer ZN521 Zone Controller CNT SVX07C EN Installation and Operation Tracer ZN521 Zone Controller CNT SVX07C EN April 2005 CNT SVX07C EN Tracer ZN521 Zone Controller Installation and Operation This guide and the information in it are the property of American Standard Inc and may not be used or reproduced in whole or in part without the written permission of American Standard Inc Trane a business of American Standard Inc has a policy of continuous product and product data improvement and reserves the right to change design and specification without notice Although Trane has tested the hardware and software described in this guide no guarantee is offered that the hardware and software are error free Trane reserves the right to revise this publication at any time and to make changes to its content without obligation to notify any per son of such revision or change Trane may have patents or patent applications covering items in this publication By providing this document Trane does not imply giving license to these patents TM The following are trademarks or registered trademarks of American Standard Inc Trane Tracer Rover TM The following are trademarks or registered trademarks of their respective companies or organizations BACnet from ASHRAE Neuron LonMark LonTalk and LonWorks from Echelon Corporation National Electrical Code form t
17. Peer to peer commu nication on page 48 communicated signal from a BAS A communicated request either from a BAS or a peer controller takes precedence over local requests If a communicated occupancy request has been established and is no longer present the controller reverts to the default occupied occupancy mode after 15 minutes if no hard wired occupancy request exists The Tracer ZN521 has the following occupancy mode options e Occupied e Unoccupied e Occupied standby e Occupied bypass Occupied mode In occupied mode the controller maintains the zone temperature based on the occupied heating or cooling setpoints The controller uses the occu pied mode as a default mode when other forms of occupancy request are not present The fan will run as configured continuous or cycling The outdoor air damper will close when the fan is off The temperature set points can be local hard wired communicated or stored default values configurable using the Rover service tool Unoccupied mode In unoccupied mode the controller attempts to maintain the zone temper ature based on the unoccupied heating or cooling setpoint The fan will cycle between high speed and off The outdoor air damper will remain closed unless economizing The controller always uses the stored default setpoint values configurable using the Rover service tool regardless of the presence of a hard wired or communicated setpoint value Occupi
18. input See 4m Figures 5 and 61 qo ces d d on page 20 for Ewiring options 77007 out I 3 150 Entering water 1 4 Outdoor air or Bl temperature generic temperature Discharge air temperature All binary inputs are configurable Connect 24 V to an AC POWER 24V terminal 27 S Figure 12 Two pipe heating unit with DX cooling Chapter 4 Input output functions and wiring for typical applications 24 Fan high speed 7 24 Vt Exhaust or fan medium speed m 24Vt Fan low speed Fan st
19. 9 10 Sms AC POWER BINARY INPUTS BINARY OUTPUTS Os cu n c m gt e TANTS Ir cuj Tracer ZN 521 OS cu OS 1 ZONE SENSOR ANALOG INPUTS 5 SERVICE COMMS NT PIN LED GND SET FAN od 2 AIs 20 LED 4 1 1 1 1 m ol leeeeeeeeecd eeeeeeeeoe BIS FAR EE k pot P og ie d 1 7777777777 in bog d ZEN fFigursband6 A qo Pod od Por dod pon page 20 for d 150 0 r2 4 wiring options out en Pis CE CA EDS LM 3 NE O Enteri t 7 Outdoor air or 5 T ntering water go LonTalk temperature d NE Ld generic temperature Discharge air mi temperature All binary inputs are configurable Connect 24 V to an AC POWER 24V terminal CNT SVX07C EN 29 S Chapter 4 Input output functions and wiring for typical applications Figure 14 Electric heat unit se 2A VT Fan high speed Q 7724 Vt i Exhaust
20. Figure 16 Two pipe heating cooling unit with face and bypass damper Chapter 4 Input output functions and wiring for typical applications 2 24 Vt Fan high speed 24 Vt Exhaust or fan medium speed O Fan low speed Fan status closed on Occupancy open occupied av 5 Heating cooling isolation valve open close Condensate overflow closed normal i 1 24 Vt O O6 1 o d d og Face and bypass damper actuator pq opc pc 24 Vt Low coil temperature detection gt lt Outdoor air damper actuator closed normal rd ees eee pe ea E opes dirus 5 24 Vf 24 4 ok or d 9 5 Generic baseboard heat rds Ups 9 1 1 1 60006066064 0060026000
21. Freeze protection switch 4 14 S G Generic Binary input 15 Binary output 59 Temperature input 18 Generic AIP failure diagnostic 61 Generic binary input 15 Generic binary output 21 Generic temperature failure diagnostic 61 H Heating or cooling mode 39 Humidity Input failure diagnostic 60 Measurement input 20 Zone sensor 20 Hydronic cooling 21 Informational diagnostics 59 Input output functions 13 34 Input output terminal wiring 7 Invalid unit configuration diagnostic 61 Isolation valve operation 46 L LEDs General 51 Interpreting green status 57 Interpreting red service 56 Interpreting yellow communications 57 Location 51 Local fan mode input failure diagnostic 61 Local setpoint failure diagnostic 61 Local setpoint input 17 LonTalk communication Description 1 Termination resistors 9 Wiring and addressing 9 LonTalk protocol see LonTalk communication CNT SVX07C EN Low coil temperature detection Diagnostic 14 59 Input 14 M Manual output test 52 Modulating outdoor return air dampers 43 Modulating valves Calibration 42 Operation 42 Morning cool down 39 Morning warm up 39 Mounting Cover 12 Diagram 12 Location 11 Operating environment 11 Procedures 12 N National Electrical Code 7 8 9 Neuron IDs Description 9 Location of label 51 Switch 15 Switching devic
22. This can take several min utes 15 minute default and occurs concurrently with the remainder of the power up sequence The random start timer expires The power up control wait function begins automatically if the config ured power up control wait time is greater than 0 seconds When this function is enabled the controller waits for the configured amount of time from 0 to 120 seconds to allow a communicated occupancy request to arrive If a communicated occupancy request arrives nor mal operation can begin If a communicated occupancy request does not arrive the controller assumes stand alone operation 8 Normal operation begins assuming no diagnostics have been generated Random start Random start is intended to prevent all units in a building from energiz ing at the same time The random start timer delays the fan and any heating or cooling start up from 5 to 30 seconds If neither heating nor cooling is initiated or if fan operation is not required during the delay the random start timer will time out 35 S Chapter 5 Sequence of operations 36 Occupancy modes Occupancy modes can be controlled by any of the following The state of the local hard wired occupancy binary input BI3 see BI3 Occupancy or generic binary input on page 15 timed override request from a Trane zone sensor see Timed over ride control on page 37 communicated signal from a peer device see
23. _ i A 10 5 ae ton page 20 for 1 o o 2 2202022 rz wiring options 0 out Eo e a xa Rod MI a e ao TET Entering water pog Outdoor air or joak temperature M EE generic temperature Discharge air temperature All binary inputs are configurable Connect 24 V to an AC POWER 24V terminal 30 CNT SVX07C EN gt TRANE Figure Fan status closed on Occupancy open occupied Wiring requirements and options 15 Two pipe heating unit with face and bypass damper 24V Fan high speed 24 Vt Exhaust or fan medium speed no 24V Fan low speed on 24 Vt D amp bypass damper actuator Condensate overflow closed normal i ie i 1 ae Nee 24V 270 m cy i 5 1 Heat isolation valve open close i OW n ME Pod og S 24V ow coil temperature detection DOO A 3 Pod po d Outdoor air damper actuator closed normal um uM P Logd o 24Vac 777777775 i 4 bog bu i poi 5 18 Generic baseboard heat 1 a oe oe s i gg BER 220200680680 2000000000 uuu uu
24. mr i o Eon pe 24 Vf 0 0 bod d js b de wd od Electric heat stage 2 optional to gd te NEM 5 Low coil temperature detection EE MEME MEM Outdoor damper actuator closed normal Ft toa og pO Tod d d H pex ct xem ld pes 24 24Vac 77777777 low d rod d e g o Generic baseboard heat 1 1 wf 1 i i 1 i iQ 9 NAE pg 220000060688 2000000000 a Te gos M Lal ss LBM 1 2 3 4 5 6 7 9 10 sTATUS AC POWER BINARY INPUTS BINARY OUTPUTS LA c OS OS Us D TRAM q 2 RANEJ m gt a Tracer ZN 521 OS OS OS N ZONE SENSOR ANALOG INPUTS 5 SERVICE COMMS PIN LED GND SET FAN Al2 20 ew A B A B LED leeeeeeeed eeeeeeeee 1 LonTalk input See I I 7777 777 in iFiguresS5and6i on page 20 for Wiring options out Entering water 5 LonTalk Lad O onia temperature Discharge air temperature Diese gee see Hl e D Or c EE
25. 19 on page 65 Compressors not running Table 20 on page 65 e Electric heat does not energize Table 20 on page 65 e outdoor air damper stays closed Table 21 on page 66 An outdoor air damper stays open Table 22 on page 66 Table 17 Fan does not energize Probable cause Unit wiring Failed end device Explanation The wiring between the controller outputs and the fan relays and contacts must be present and correct for normal fan operation Refer to applicable wiring diagram The fan motor and relay must be checked to ensure proper operation Normal operation The fan will turn off when the controller receives a communicated off signal when the fan speed switch is set to OFF when specific diagnostics are generated or when the default fan speed is set to Off and the fan is operating in the Auto mode If the controller is in unoccupied mode the fan cycles between off and the highest fan speed No power to the con troller If the controller does not have power the unit fan does not operate For the Tracer ZN521 controller to operate normally it must have an input voltage of 24 Vac If the green LED is off continuously the controller does not have sufficient power or has failed Power up control wait If power up control wait is enabled non zero time the controller remains off until one of two conditions occurs 1 The controller exits power up control wait after it receives communi
26. 66 Valves 64 Two pipe operation 43 Two position damper control 46 Two position valve operation 43 Types of diagnostics 58 U UL see Agency listing compliance Unit protection strategies Condensate overflow 49 Discharge air temperature low limit 50 Fan off delay 49 Fan status 49 Filter maintenance timer 50 Freeze avoidance 50 Freeze protection 50 Low coil temperature protection 49 Smart reset 49 Unit ventilators 1 21 Universal 4 20 mA 19 42 V Valves Actuators 4 Calibration of modulating 42 Four pipe operation 43 General operation 42 Isolation valve operation 43 Operation of modulating 42 Operation of two position 43 Supported applications 1 21 42 Tri state modulating 1 21 42 Troubleshooting 64 Two pipe operation 43 Two position 1 21 Water and duct temperature sensors 4 Wiring BAS communication 9 Compliance with National Electrical Code 7 8 9 General 7 9 Input output terminals 7 LonTalk communication 9 Minimum requirements 22 Requirements and options 22 34 Wiring diagrams 22 34 Electric heat unit 30 Electric heat unit with DX cooling 29 Four pipe heating cooling unit with auto changeover 27 Four pipe heating cooling unit with face and bypass damper 33 Four pipe hydronic heating cooling unit 26 Two pipe heating unit with DX cooling 28 Two pipe heating cooling unit with face and bypass damper 32 Two pipe hydronic heating cooling unit
27. binary input Table 3 Binary inputs Binary input terminal label Function Low coil temperature detection BI2 Condensate overflow BI3 Occupancy or generic binary input Fan status Each function is explained in the following paragraphs For an explana tion of the diagnostics generated by each binary input see Diagnostics on page 58 For more information about how the controller operates see Chapter 5 Sequence of operations Low coil temperature detection Note applies to hydronic steam coils only The function of low coil temperature detection is to protect the coil from freezing If BI1 is wired to a binary low coil temperature detection device freeze protection switch and a low coil temperature condition exists the Tracer ZN521 will detect the condition and generate a Low Coil Temp Detection diagnostic BI2 Condensate overflow The function of condensate overflow is to prevent the condensate drain pan from overflowing and causing water damage to the building If BI2 is wired to a condensate overflow switch and the level of condensate reaches the trip point the Tracer ZN521 will detect the condition and generate a Condensate Overflow diagnostic 14 CNT SVX07C EN S CNT SVX07C EN Binary inputs BI3 Occupancy or generic binary input The binary input can function as either The occupancy input generic binary input The fun
28. communicating 1 By sending a request from the Rover service tool you can request the controller s green LED to blink wink a notification that the controller received the signal The yellow communications LED on the Tracer ZN521 controller see Figure 19 on page 51 indicate the controller s communication status see Table 15 Table 15 Yellow LED Communications indicator LED activity Explanation LED is off continuously The controller is not detecting any communication normal for stand alone applications LED blinks The controller detects communica tion normal for communicating applications including data sharing LED is on continuously Problem with communication link wiring possible need for termination resistor or controller failure caused by power surge lightning strike etc 57 S Chapter 6 Status indicators for operation and communication 58 Diagnostics Diagnostics are informational messages that indicate the operational sta tus of the controller In response to most diagnostics the controller attempts to protect the equipment by enabling or disabling or opening or closing specific outputs Other diagnostics provide information about the status of the controller but have no effect on outputs Diagnostics are reported in the order in which they occur Multiple diagnostics can be present simultaneously Diagnostic messages are vi
29. e Baseboard heat single stage Tri state modulating outdoor return air damper e Tri state modulating face and bypass damper The Tracer ZN521 controller includes ten binary outputs Each binary output is a triac with a rating of 12 VA at 24 Vac Table 6 describes the function of each output Table 6 Binary output functions Binary output Functions 1 Fan high 2 Fan medium Exhaust fan or damper Fan low Modulating cooling changeover valve open Two position cooling changeover valve DX cooling 5 Modulating cooling changeover valve close Face and bypass damper open to face 6 Modulating heating valve open Two position heating valve Electric heat stage 1 7 Modulating heating valve close Face and bypass damper close bypass Electric heat stage 2 8 Outdoor air damper open return air damper close 9 Outdoor air damper close return air damper open 10 Baseboard heat Generic Generic binary output Binary output 10 is the only output that can be configured as a generic binary output When configured as a generic binary output it can be con trolled only by a BAS and has no direct effect on Tracer ZN521 operation 21 S Chapter 4 Input output functions and wiring for typical applications Overriding binary outputs The Tracer ZN521 controller includes a manual output test and a water valve override feature Use the manu
30. generate a Generic Temperature Failure diag nostic if the input becomes invalid or goes out of range Note is not polarity sensitive you can connect either terminal to either sensor lead Universal 4 20 mA The AI4 analog input can be configured in one of the three ways shown in Table 5 Table 5 Al4 configuration options and associated measurement ranges Configuration Measurement range Generic 4 20 mA input 0 100 4 mA 0 20 mA 100 CO measurement 0 2000 ppm 4 mA 0 ppm 20 mA 2000 ppm Relative humidity RH measurement 0 10096 4 mA 0 RH 20 mA 100 RH If this input is not needed for an application configure it as Not Used This will disable the generation of diagnostics Note AIA is polarity sensitive For the generic input configuration a 4 20 mA sensor must be hard wired to the AI4 terminal Wiring is dependent on the specific applica tion The sensor communicates a value of 0 100 to the BAS This con figuration has no direct effect on Tracer ZN521 operation If a valid value 19 S is established and then is longer present the controller generates a Generic AIP Failure diagnostic Chapter 4 Input output functions and wiring for typical applications For the CO measurement configuration a 4 20 mA sensor must be hard wired to the AI4 terminal as shown in Figure 5 The sensor will transmit a 0 2000 ppm value to the BAS This configuration
31. has no direct effect on Tracer ZN521 operation If a valid value is established and then is no longer present the controller generates a Sensor Failure diagnostic Figure 5 terminal wiring CO measurement Tracer ZN521 20 Al4 GND 24Vac ety CO sensor Trane 5010 0828 shown gt e 2 2 eo N Co gt 24 GN Signal For the RH measurement configuration either a hard wired 4 20 mA zone humidity sensor see Figure 6 must provide a value to the controller or a BAS communicates a value to the controller The controller uses this value to support the dehumidification function For more information see Dehumidification on page 47 If a valid hard wired or communi cated relative humidity value is established and then is no longer present the controller generates a Humidity Input Failure diagnostic and disables the dehumidification function Figure 6 Al4 terminal wiring RH measurement Tracer ZN521 20 Al4 GND pe al RH sensor 20 CNT SVX07C EN S CNT SVX07C EN Binary outputs Binary outputs The ZN521 zone controller supports fan coil blower coil and unit ventila tor applications that may include the following components e Supply fan with up to three speeds Hydronic cooling and or heating coils with two position or tri state modulating control valve DX cooling single stage e Electric heat single stage two stage
32. iil A B A B LED Y T uu T un eeeeeecec EN Pot EE a 3 LonTal un Al4 input See t7 Figures5and6 7 1 i Oon So do ow og i 1onpage 20 for a MEME t Pwiringoptions E s ue out o js You lg ee pae o STI A3 o 42 poU D i 1 4 bog en ar ese Entering water Fog Outdoor air or generic temperature on temperature mi Discharge air temperature All binary inputs are configurable Connect 24 V to an AC POWER 24V termi 24 CNT SVX07C EN S Wiring requirements and options Figure 9 Two pipe hydronic heating cooling unit with auto changeover u Fan high speed 24 Exhaust or fan medium speed 24 Fan low speed Fan status closed on H 24 Heating cooling changeover valve Occupancy open occupied MEE CD Ben Pod 7 Electric heat stage 1 optional Condensate overflow closed normal
33. modulates the outdoor air damper between the active minimum damper position and 100 to control the amount of outdoor air cooling capacity When the outdoor air temperature rises 5 F 2 8 C above the economizer enable point the controller disables economizing and moves the outdoor air damper back to its predetermined minimum position based on the current occupancy mode or communicated minimum outdoor air damper position If an outdoor air temperature value is not present economizing is disabled CNT SVX07C EN 45 S Chapter 5 Sequence of operations 46 Two position control of a modulating outdoor air damper The Tracer ZN521 does not support a two position outdoor air damper actuator However a modulating outdoor return air damper actuator can be used for two position control Two position control can be accomplished by not providing an outdoor air temperature neither hard wired nor com municated to the controller and by setting the damper minimum posi tion using the Rover service tool to the desired value typically 100 Face and bypass damper operation The Tracer ZN521 can control a face and bypass damper to modulate a percentage of air to the face of the coil s and around bypass the coil s to maintain zone comfort For two pipe changeover applications if the con troller requests heating and hot water is available the face and bypass damper modulates to the face position If the controller requests he
34. off The con troller will remain in occupied bypass mode until either the CANCEL but ton is pressed on the Trane zone sensor or the occupied bypass time configurable using the Rover service tool expires The temperature set points can be local hard wired communicated or stored default values also configurable using the Rover service tool Timed override control If the zone sensor has a timed override option ON CANCEL buttons push ing the ON button initiates a timed override on request A timed override on request changes the occupancy mode from unoccupied mode to occu pied bypass mode In occupied bypass mode the controller controls the zone temperature based on the occupied heating or cooling setpoints The occupied bypass time which resides in the Tracer ZN521 and defines the duration of the override is configurable from 0 to 240 minutes default value of 120 minutes When the occupied bypass time expires the unit transitions from occupied bypass mode to unoccupied mode Pushing the CANCEL button cancels the timed override request A timed override can cel request will end the timed override before the occupied bypass time has expired and will transition the unit from occupied bypass mode to unoccupied mode If the controller is in any mode other than unoccupied when the ON but ton is pressed the controller still starts the occupied bypass timer with out changing the mode to occupied bypass If the controller is placed i
35. operation the fan will cycle between off and high regardless of the CNT SVX07C EN S CNT SVX07C EN Exhaust control fan configuration The controller can be configured to auto to a specific fan speed or to off If both a communicated and hard wired value fan speed switch is present the communicated value has priority Note In occupied mode The Tracer ZN521 zone controller requires continuous fan operation because of cascade zone control In unoccupied mode the fan cycles When the controller receives a communicated auto signal or the associ ated fan speed switch is set to AUTO with no communicated value present the fan will operate in the auto mode In the auto mode the fan will operate according to the fan default configurable using the Rover service tool The fan speed can be configured to default to auto a specific speed or off for both heating and cooling operation Configured as auto and with multiple speeds available the fan will auto matically switch speeds depending on the difference between the zone temperature and the active zone temperature setpoint The fan speed will increase as the difference increases and decrease as the difference decreases When the controller receives a communicated fan speed signal high medium low or the associated fan speed switch is set to a specific fan speed the fan will run continuously at the desired fan speed during occu pied occupied standby and o
36. to monitor the status of the fan for belt driven or direct driven units The fan status switch provides feedback to the controller If the fan is not operating when the controller has the fan controlled to on the controller will generate a Low AirFlow Fan Failure diagnostic If the controller energizes the fan output for 1 minute and the fan status switch indicates no fan operation the controller performs a unit shut down and generates a Low AirFlow Fan Failure diagnostic If the fan has been operating normally for one minute but the fan status switch indicates no fan operation the same diagnostic is generated This manual diagnostic discontinues unit operation until the diagnostic has been cleared from the controller If a diagnostic reset is sent to the controller and the fan condition still exists the controller attempts to run the fan for 1 minutes before generating another diagnostic and performing a unit shutdown Fan off delay After heating has been controlled off the Tracer ZN521 keeps the fan energized for an additional 30 seconds The purpose of this feature is to remove residual heat from the heating source 49 S Chapter 5 Sequence of operations Filter maintenance timer The filter maintenance timer tracks the amount of time in hours that the fan is enabled The Maintenance Required Timer Setpoint config urable using the Rover service tool is used to set the amount of time until maintenance typi
37. 1 z pue s edwep pue sjndino Jeay 21 pue yo suuin XJ LL NIS o o Mom el 2 aj b E Oo S S mr mar 59 osaso mm 5 9 5 20 232 EE xs 59 ENS al 2 Q 9 Bc moo 55 5952 2 gt 42 5 0 5 5 gt ct 3 20 3 S ep amp os 52997 8 et 5 d 85 325 E 55 05 2 o 37 oo er O e lt 5 lt lt 5 3 5 gt oe 25 5 3 3 n gt gt amp v h z 2 7 lt O 575 23 lt 5 oo lt 5 5 nO 2 5 5 A a Gr 9 lt 5 OLdOS 6dO8 8dO8 LdO8 9dO8 SdO8 vdO8 dO8 dO8 LdO8 dais Chapter 6 Status indicators for operation and communication e uenbes 1591 jenueyy LL CNT SVX07C EN Table 12 Manual output test sequence for face and bypass configurations two position isolation valves Manual output test only Step Result BOP1 BOP2 BOP3 BOP4 BOP5 BOP6 BOP7 8 9 Bi o o o o amp nn 2 gt 2 28 S E x a5 gt c o o poa a 0 os o o N E E o gt o
38. E e oe 9 s oa 258 eg 38230 58 z5 5 F as 385 95 352298 55 S oo 5 go D 3 55 o o i oA HESTS lt 5 5 o 3 3 5 D E 588 s 55 8 FE 5 S 285 5 2 2 53 S lt 5 2 9 D 9 9 amp o 2 o 0LdOd 6dO8 8dO8 LdO8 9409 SdO8 vdOd dOd LdOd dais S suoneanBijuoo e uenbes 1591 jenueyy LL 53 CNT SVX07C EN S 49 041u09 y 9101501 01 19501 e YOIYM ue 1591 jenuew 01 deis sayy peeds peJeus si uej eu 7 deis uo seziBjeue 1ndino 1sneuxe oy peeds z 10 e 10 peunBijuoo si deis peeds uo ue y peeds e 10 j deis je seziD1eue 1ndino peeds ue eui uel peeds z e 104 peunBijuoo j days ye seziDJeue Ind no peeds uel y peeds g e j y 2 deis peeds uo y peeds z 10 j deis 1e eziDjeue peeds ue y uez peeds eg e 10 j sonsouBeip s dwaye 48 044U09 94
39. Entering water temperature on page 17 Make sure the valves are correctly configured using the Rover service tool as normally open or normally closed as dictated by the application 64 CNT SVX07C EN Troubleshooting Table 19 Valves remain open Probable cause Explanation Unit wiring The wiring between the controller outputs and the valve s must be present and correct for normal valve operation Refer to applicable wiring diagram Failed end device The valves must be checked to ensure proper operations Normal operation The controller opens and closes the valves to meet the unit capacity requirements Manual output test The controller includes a manual output test sequence you can use to verify output oper ation and associated output wiring However based on the current step in the test sequence the values may not be open refer to the Manual output test on page 52 Diagnostic present Unit configuration Several diagnostics affect valve operation For information about these diagnostics see Table 16 on page 59 The controller must be properly configured based on the actual installed end devices and application If the unit configuration does not match the actual end device the valves may not work correctly Entering water temperature sampling logic Valve configuration The controller includes entering water temperature sampling logic which is a
40. M Cooling isolation valve open close Face and bypass damper actuator 24NV Heating isolation valve open close Outdoor air damper actuator gt 24 Vt 24 s d E 2 5 Generic baseboard heat o OO 1220000000600 6000600060 Fr m mm n d 5 24V 24V 2 Leal P CBB PM 1 2 3 4 5 6 7 8 9 10 STATUS AC POWER BINARY INPUTS BINARY OUTPUTS Ot os zu Um an TRANEI ae V cu Tracer ZN 521 OS 1 OS Um ZONE SENSOR ANALOG INPUTS 5 COMM5 PIN LED fa GND SET FAN AM 12 20 Al4 ono A B A B LED eeeeeeeeec M LonT
41. VA and its associated output devices including relays and actuators to a maxi mum of 12 VA per output utilized Water duct and outdoor air temperature sensors Temperature sensors must be Trane 10 kO at 25 C thermistors Enter ing water and discharge air inputs may use a sealed temperature sensor part number 4190 1100 Binary input switching devices Occupancy condensate overflow low coil temperature and fan status inputs accept switching devices that may have normally open or normally closed dry contacts Output devices Output devices connected to the Tracer ZN521 binary outputs cannot exceed 12 VA 0 5 A current draw at 24 Vac Zone temperature sensors Table 1 shows the Trane zone temperature sensors that are supported by the Tracer ZN521 zone controller Valve actuators Valve actuators cannot exceed 12 VA draw at 24 Vac For two position valves use actuators with on off action and with a spring action that 4 CNT SVX07C EN Additional components Table 1 Tracer zone temperature sensor options Timed Fan Zone override buttons BAS order Use m namber Setpoint High Med Low Auto Off thumb Temperature On Cancel wheal sensor 4190 1087 Any 4190 1088 x x x x 4190 1090 Any x x x x x 4190 1094 Any 4190 1095 Unit x x x x x x x x ventilator 4190 1115 Fan coil x x X X x x x x 4190 1116 Unit x x x x x x ventil
42. acer ZN521 zone controller see Figure 3 Figure 3 Connecting ac power wires to the controller 24Vac transformer N oo 24V 24V 7 AC POWER gt The Tracer ZN521 may be powered by an existing transformer integral to the controlled equipment provided the transformer has adequate power available and proper grounding is observed If you are providing a new transformer for power use a UL listed Class 2 power transformer supply ing a nominal 24 Vac 19 30 Vac The transformer must be sized to pro vide adequate power to both the Tracer ZN521 zone controller 14 VA and its associated output devices including relays and actuators to a maximum of 12 VA per output utilized 8 CNT SVX07C EN S CNT SVX07C EN Communication link wiring and addressing Communication link wiring and addressing The Tracer ZN521 zone controller communicates with the BAS and with other LonTalk controllers by means of a LonTalk communication link IMPORTANT For important instructions on network wiring refer to the Tracer Sum mit Hardware and Software Installation guide BMTX SVNO1A EN Wiring for the communication link must meet the following require ments All wiring must comply with the National Electrical Code and local codes 22 AWG Level 4 unshielded communications wire recommended for most Comm installations e Termination resistors are required for wiring LonTalk devices com m
43. agnostic present Several diagnostics affect valve operation For information about these diagnostics see Table 16 on page 59 Normal operation Unit configuration The controller opens and closes the valves to meet the unit capacity requirements The controller must be properly configured based on the actual installed end devices and application If the unit configuration does not match the actual end device the valves may not work correctly Manual output test The controller includes a manual output test sequence you can use to verify output oper ation and associated output wiring However based on the current step in the test sequence the valves may not be open Refer to the Manual output test on page 52 Random start observed After power up the controller always observes a random start from 5 to 30 seconds The controller remains off until the random start time expires Requested mode off Entering water temperature sampling logic Valve configuration You can communicate a desired operating mode such as off heat and cool to the con troller If off is communicated to the controller the unit controls the fan off There is no heating or cooling The controller includes entering water temperature sampling logic which is automati cally initiated during 2 pipe and 4 pipe changeover if the entering water temperature is either too cool or too hot for the desired heating or cooling See Al1
44. al output test to manually control the outputs in a defined sequence For information see Manual output test on page 52 The water valve override feature is a procedure used for water balancing Using the Rover service tool or a BAS a user can specify that a Tracer ZN521 override the state of water valves to e Open all valves e Close all valves The controller resets itself to normal operation after two hours Wiring requirements and options Table 7 shows required controller inputs for minimal proper operation of all applications Table 7 Required controller inputs for proper operation Function Input source For 24 Vac power Terminals GND 24 V AC power wiring on page 7 Zone temperature Terminals ZN GND ZN Zone tempera or communicated ture on page 16 Discharge air temperature Terminals AI2 Al2 Discharge air tem perature on page 18 Entering water tempera Terminal 11 Entering water ture required only for or communicated temperature on units with auto page 17 changeover Outdoor air temperature Terminals AI3 or Outdoor air tem required only for econo communicated perature or generic mizing temperature on page 18 Relative humidity Terminals Al4 Al4 Universal 4 required only for dehu 20 mA on page 19 midification Figure 7 on page 23 through Figure 17 on page 33 show typical applica tions that include all require
45. alk ko ue ok d MERE d AMinputSee I 0077 in od od og Lower d Figures5and6 i A pana options s t ee S eiu e to 114 14 Cancel 1 1 HEO Entering water E Outdoor air or LonTalk temperature FA Imi generic temperature CNT SVX07C EN Discharge air temperature All binary inputs are configurable t Connect 24 V to an AC POWER 24V terminal 33 Chapter 4 Input output functions and wiring for typical applications 34 S CNT SVX07C EN S CNT SVX07C EN Chapter 5 Sequence of operations The Tracer ZN521 zone controller will operate to maintain the zone tem perature setpoint This chapter discusses many of the operational sequences used by the controller to accomplish this goal Power up sequence When 24 Vac power is initially applied to the Tracer ZN521 zone control ler the following sequence occurs 1 The green status indicator LED turns on see Interpreting LEDs on page 56 2 All outputs are controlled off All modulating valves and dampers close and the face and bypass damper calibrates to bypass when present 3 The controller reads all input local values to determine initial values The random start timer begins see Random start on page 35 If a hard wired zone temperature value is not detected the controller begins to wait for a communicated value
46. an mode value is present the controller recognizes the fan mode value as auto and operates according to the default configuration If a valid hard wired or communicated fan mode value is established and then is no longer present the controller generates a Fan Mode Failure diagnostic Al1 Entering water temperature The AI1 analog input functions as the local hard wired entering water temperature input An entering water temperature communicated via the LonTalk communications link can also be used for controllers operating on a BAS If both hard wired and communicated entering water tempera ture values are present the controller uses the communicated value If a valid hard wired or communicated entering water temperature value is established and then is no longer present the controller generates an Entering Water Temp Failure diagnostic For units configured as 2 pipe or 4 pipe changeover units the entering water temperature is used to make heating cooling operation decisions If neither a hard wired nor a communicated entering water temperature value is present on changeover units the controller will always operate in heating mode 17 S Chapter 4 Input output functions and wiring for typical applications 18 For units not configured as changeover units the entering water temper ature value is used for information and troubleshooting only and does not affect the operation of the controller Note is not
47. apacity during unoccupied mode While unoccupied the fan cycles on or off with heating cooling to provide varying amounts of heating or cooling to the space Fan mode off If a local fan mode switch determines the fan operation the off position controls the fan off Requested mode off Table 18 Valves remain You can communicate a desired operating mode such as off heat and cool to the con troller If off is communicated to the controller the unit controls the fan off There is no heating or cooling closed Probable cause Explanation Unit wiring The wiring between the controller outputs and the valve s must be present and correct for normal valve operation Refer to applicable wiring diagram Failed end device The valves must be checked to ensure proper operation No power to the con troller If the controller does not have power the unit valve s will not operate For the Tracer ZN521 controller to operate normally you must apply an input voltage of 24 Vac If the green LED is off continuously the controller does not have sufficient power or has failed Power up control wait If power up control wait is enabled non zero time the controller remains off until one of two conditions occurs 1 The controller exits power up control wait after it receives communicated information 2 The controller exits power up control wait after the power up control wait time expires Di
48. ated the diagnostic is solved CNT SVX07C EN S Table 16 Diagnostics Diagnostics Smart reset diagnostics After the controller detects the first smart reset diagnostic the unit waits 30 minutes before initiating the smart reset function If another diagnos tic of this type occurs again within 24 hours after an automatic clearing you must clear the diagnostic manually by using any of the ways shown for Manual latching diagnostics Informational diagnostics Informational diagnostics provide information about the status of the controller They do not affect machine operation They can be cleared from the controller using any of the ways shown for Manual latching diag nostics Table of diagnostics Table 16 The tables present each diagnostic that can be generated by the Tracer ZN521 its effect on outputs consequences and its type Note The generic binary output is unaffected by diagnostics Diagnostic Probable cause Consequences Diagnostic type Maintenance Required Fan run hours exceed the time set to indicate filter change Fan unaffected Valves unaffected Electric heat unaffected Face and bypass damper unaffected Informational Condensate Overflow The drain pan is full of water Fan off Valves closed Outdoor air damper closed Face and bypass damper bypass DX electric heat off Baseboard heat off Manual Low Coil Temp Detection Th
49. ating and hot water is not available the face and bypass damper remains in the bypass position and water sampling may be initiated see Entering water temperature sampling function on page 40 For four pipe changeover applications both heat and cool capacity are assumed to be available Face and bypass isolation valve operation A Tracer ZN521 with a face and bypass damper controls on off isolation valve s to prevent unwanted water flow through the coil s when no air flow is passing over the coil 100 bypass In two pipe applications the isolation valve stops water flow preventing radiant heat heating mode and excessive condensate cooling mode from the coil In four pipe appli cations the isolation valves are used to prevent simultaneous heating and cooling The heating or cooling isolation valve opens whenever capacity is requested gt 0 as the face and bypass damper begins to modulate toward the coil face The isolation valve closes when capacity returns to 0 DX cooling operation The Tracer ZN521 supports one stage of direct expansion DX compres sor operation for cooling only Note The controller does not use the DX compressor and economizing simultaneously Not doing so prevents short cycling from occur ring if the entering air temperature is too low for the evapora tor coil to operate as designed CNT SVX07C EN S CNT SVX07C EN Electric heat operation Electric heat operatio
50. ator 4190 1117 Any x x CNT SVX07C EN returns the valve to normally open or closed dependent on the desired default position For modulating valve control use tri state modulating actuators with or without a spring return as required by the application Damper actuators Damper actuators cannot exceed 12 VA draw at 24 Vac For control of out door return air dampers use tri state modulating actuators that incorpo rate a spring return Zone humidity sensor For measurement of relative humidity RH the Tracer ZN521 requires a zone humidity sensor with a 4 20 mA output where 4 mA is 0 RH and 20 mA is 100 RH The controller provides 20 Vdc to power the zone humidity sensor CO sensor For CO measurement the Tracer ZN521 requires sensor with a 4 20 mA output where 4 mA 0 ppm and 20 mA 2000 ppm Chapter 1 Overview and specifications 6 CNT SVX07C EN CNT SVX07C EN Chapter 2 General wiring information This chapter provides specifications and general information about wir ing the Tracer ZN521 zone controller The controller requires wiring for Input output terminals AC power to the controller e Communication link wiring if the controller is to communicate with a building automation system BAS Input output terminal wiring All input output terminal wiring for the Tracer ZN521 zone controller is application specific a
51. atus closed on I 24 Vt DX cooling Occupancy open occupied i i eoi 24 3 Heating valve Condensate overflow closed normal ror 0 4 wot de mri od POT pa Low coil temperature detection boro toro po do 08 NE Outdoor air damper actuator closed normal li Pi pi t oq oPoY TERMS mee 4 ur Pes toot 24 bor or d d od ME Foro 4 29 548 Generic baseboard heat 1 rid 1 1 ro QO jad M a a TS OO 7 peeeeoo o o mu ur F1 G 24V aav aov P BI2 LBB LBM 1 2 3 4 5 7 9 10 STATUS AC POWER BINARY INPUTS BINARY OUTPUTS Tracer ZN 521 cu C ZONE SENSOR ANALOG INPUTS 5 COMMS5 PIN LED GND SET FAN An 12 20 B LED o leeeeeeeeed eeeeeeocce NM MEME input See 0b on oO o fFigures 6 A PD MEME MEME on 20 for Pod rotor od wiring options o rot dia PoP EEE di 8 eee aic ci io ab EN Cancel Q 1 EQ Entering water pod Outdoor air or generic temperature 5 9 pod LU g p Sontak temperature bod Discharge air temperature All binary inputs are configurable Connect 24 V to an AC POWER 24V terminal 28 CNT SVX07C EN S
52. bration 42 Modulating valve operation 42 Morning cool down 39 Morning warm up 39 Occupancy modes 36 Outdoor return air 43 Peer to peer communication 48 Power up sequence 35 Random start 35 Smart reset 49 Timed override control 37 Two pipe operation 43 Two position damper control 46 Two position valve operation 43 Unit protection strategies 48 Valves 42 Zone temperature control 38 Service pin button 51 56 Smart reset Diagnostic 49 59 Unit protection 49 Specifications AC power wiring 7 Agency listing compliance 3 Clearances 2 Dimensional diagram 3 Dimensions 2 Input output terminal wiring 7 LonTalk communication wiring and addressing 9 Storage environment 2 Transformers 8 Status indicators for operation and communication Diagnostics 58 General 51 Green status LEDs 57 LEDs 51 Manual output test 52 Red service LEDs 56 Service pin button 56 Test button 51 Yellow communication LEDs 57 Storage environment 2 41 Index Switching devices Condensate overflow 4 14 Current sensing 4 Fan status 4 Freeze protection 4 14 Low coil temperature 4 Occupancy 4 15 T Temperature sensors Table of options 5 Water and duct 4 Zone 4 Termination resistors 9 Test button 51 52 Timeclock 15 Timed override control 37 Transformers 4 7 8 Troubleshooting DX cooling 65 Electric heat failure 65 Fans 63 Outdoor air damper
53. cally a filter change is needed If the setpoint is config ured to zero the filter maintenance timer is disabled The controller compares the fan run time to Maintenance Required Timer Setpoint Once the setpoint is reached the controller generates a Mainte nance Required diagnostic When the diagnostic is cleared the controller resets the filter maintenance timer to zero and the timer begins accumu lating fan run time again Freeze avoidance Freeze avoidance is used for low ambient temperature protection It is ini tiated only when the fan is off The controller enters the freeze avoidance mode when the outdoor air temperature is below the Freeze Avoidance Setpoint configurable using the Rover service tool The controller dis ables freeze avoidance when the outdoor air temperature rises 3 F 1 7 C above the Freeze Avoidance Setpoint When the controller is in freeze avoidance mode e Valves are driven open to allow water to flow through the coil e Fan is off e Face and bypass damper when present is at full bypass e Economizing is disabled The outdoor return air damper is closed DX cooling is off Electric heat stages are off Freeze protection discharge air temperature low limit The controller monitors the discharge air temperature with a 10 kO ther mistor wired to analog input AI2 The freeze protection operation is initi ated whenever the discharge air temperature falls below the Discharge Air Tem
54. cated information 2 The controller exits power up control wait after the power up control wait time expires Diagnostic present Several diagnostics affect fan operation For information about these diagnostics see Table 16 on page 59 Unit configuration The controller must be properly configured based on the actual installed end devices and application If the unit configuration does not match the actual end device the fans may not work correctly Manual output test Random start observed The controller includes a manual output test sequence you can use to verify output oper ation and associated output wiring However based on the current step in the test sequence the unit fan may not be on Refer to the Manual output test on page 52 After power up the controller always observes a random start from 5 to 30 seconds The controller remains off until the random start time expires CNT SVX07C EN 63 Chapter 7 Troubleshooting Table 17 Fan does not energize Continued Probable cause Explanation Cycling fan operation continuous The controller operates the fan continuously when in the occupied occupied standby or occupied bypass mode When the controller is in the unoccupied mode the fan is cycled between high speed and off with capacity Unoccupied operation Even if the controller is configured for continuous fan operation the fan normally cycles with c
55. ccupied bypass operation During unoccu pied operation the fan will cycle between off and high regardless of the communicated fan speed signal or fan speed switch setting unless either of these is off which will control the fan off The fan will turn off when the controller receives a communicated off sig nal when the fan speed switch is set to OFF when specific diagnostics are generated or when the default fan speed is set to off and the fan is oper ating in the auto mode The ability to enable or disable the controller s associated fan speed switch is configurable Exhaust control Exhaust control is accomplished by a single speed exhaust fan or a two position exhaust damper BOP2 controls this function To enable exhaust control configure the controller by selecting Exhaust Fan Damper Present and by selecting the number of fan speeds as either One or Two The exhaust function is coordinated with the supply fan and outdoor return air dampers as follows The exhaust output is energized only when the supply fan is operat ing and the outdoor air damper position 96 is greater than or equal to the Exhaust Fan Damper Enable Setpoint configurable using the Rover service tool 41 S Chapter 5 Sequence of operations Table 8 Valve control options The exhaust output is de energized if the outdoor air damper position drops 10 below the Exhaust Fan Damper Enable Setpoint Ifthe Exhaust Fan Damp
56. cribed in Table 14 on page 57 when the Test button is released to indicate that the control ler is in manual test mode 2 Press the Test button no more than once per second to advance through the test sequence Table 11 and Table 12 show the resulting activities of the binary outputs Note The outputs are not subject to minimum on or off times during the test sequence CNT SVX07C EN Manual output test y y p eogaseq uo HO HO 30 HO HO HO HO HO yS y uo OL 9509 HO 95013 0 HO HO HO Jo HO HO HO uBiH uO Jodweq 6 uedo Jeduuep uo zH3 HO LH3 HO HO usdoyuo 95015 0 HO 30 HO HO HO esoj xny 8 guez sneuxe uo 2 uo LH HO HO HO HO u do uo HO HO HO HO L yS y uo uado xny L uo LH3 uedo xne xq HO HO HO HO uedo uo 9eso 3 uo HO HO HO esoj 9 uo xa HO HO HO HO HO HO uedo uo HO HO uedo 9 30 HO HO 30 HO HO HO moyuo HO HO yMO v HO 2 30 HO HO 30 HO HO HO HO L HO ue4 30 HO HO 30 HO HO HO HO HO y y uo HO Z HO 9so19 UO HO 95013 0 L HO 95013 0 HO HO HO HO L NU Se Eur ES oues 1 De U Oo e 3 mm 5 9o 20 232 X53 9 5 5 5 o gt 98 908 5o 39 oz 9 25 5452 625 25 5 3 a DE 3 5 5 23 05 ane T
57. ction of occupancy is to save energy by spreading zone setpoints when the zone is unoccupied As the occupancy input BI3 can be used for two related functions For stand alone controllers BI3 can be hard wired to a binary switch or timeclock to determine the occupancy mode either occupied or unoccupied For controllers receiving a BAS communicated occupancy request the function of BI3 is to change the mode from occu pied to occupied standby For more information on occupancy related functions see Occupancy modes on page 36 is the only binary input that can be configured as generic If config ured as a generic binary input it can be monitored by a BAS and has no direct effect on Tracer ZN521 operation 814 Fan status The fan status input provides feedback to the controller regarding the fan s operating status If BI4 is wired to a fan status switch and the input indicates that the fan is not operating when the controller has the fan controlled to on the controller will generate a Low AirFlow Fan Failure diagnostic For more information see Fan status on page 49 15 S Chapter 4 Input output functions and wiring for typical applications Analog inputs The Tracer ZN521 controller includes seven analog inputs Table 4 describes their functions Each function is explained in the following paragraphs For an explanation of the diagnostics generated by each ana log input see Diagnostics
58. d and all optional components 22 CNT SVX07C EN gt TRANE Wiring requirements and options Figure 7 Two pipe hydronic cooling unit 24V Fan high speed 24V Exhaust or fan medium speed i724 Vt Fan low speed Fan status closed on i 24 Vt oo 1 4 Cooling valve Occupancy open occupied E E Vt Electric heat stage 1 optional Z x d 24 Vt Condensate overflow closed normal Electric heat stage 2 optional 24V Low coil temperature detection REESE pode EXE 04 og Outdoor air damper actuator closed normal eco i idi od tt DOG sb we x d S od 4 CE GE we dd 724 Vt 24 Vac IR i 58 i FE ES Generic baseboard heat od le i o gu ig 1 we 24V 2020 Land m BI3 pm 1 2 3 4 5 6 7 9 10 STATUS AC POWER BINARY INPUTS BINARY OUTPUTS E T7 Tracer ZN 521 c
59. e Fan off Valves closed Outdoor air damper closed Face and bypass damper bypass DX cooling electric heat off Baseboard heat off Automatic Outdoor Air Temp Failure Invalid or missing value for outdoor air tempera ture Fan unaffected Valved unaffected Outdoor air damper minimum position Face and bypass damper unaffected DX cooling electric heat unaffected Baseboard heat unaffected Automatic Humidity Input Failure Invalid or missing value for relative humidity Fan unaffected Valves unaffected Outdoor air damper unaffected Face and bypass damper unaffected DX cooling electric heat unaffected Baseboard heat unaffected Dehumidification sequence off Automatic CO Sensor Failure 60 Invalid or missing value for CO Fan unaffected Valves unaffected Outdoor air damper unaffected Face and bypass damper unaffected DX cooling electric heat unaffected Baseboard heat unaffected Informational CNT SVX07C EN Diagnostics Table 16 Diagnostics Continued Diagnostic Probable cause Consequences isis Generic AIP Failure Invalid or missing value Fan unaffected Informational for generic analog input Valves unaffected Outdoor air damper unaffected Face and bypass damper unaffected DX cooling electric heat unaffected Baseboard heat unaffected Local Fan Mode Failure Invalid or missing fan Fan unaffected Automatic speed switch reverts to Valves u
60. e leaving fluid temper Fan off Smart reset tactor or motor has failed ature may be close to Valves open Manual freezing Outdoor air damper closed Face and bypass damper bypass DX electric heat off Baseboard heat off Low Airflow Fan Failure The fan drive belt con Fan off Manual Valves closed Outdoor air damper closed Face and bypass damper bypass DX electric heat off Baseboard heat off CNT SVX07C EN 59 Chapter 6 Status indicators for operation and communication Table 16 Diagnostics Continued Diagnostic Probable cause Consequences Diagnostic type Space Temperature Failure Invalid or missing value for zone temperature Fan off Valves closed Outdoor air damper closed Face and bypass damper bypass DX electric heat off Baseboard heat off Automatic Entering Water Temp Failure Invalid or missing value for zone temperature Fan unaffected enabled Valves unaffected Outdoor air damper unaffected Face and bypass damper unaffected DX electric heat unaffected Baseboard heat off Automatic Discharge Air Temp Limit Discharge air tempera ture has fallen below the Discharge Air Tempera ture Low Limit Fan off Valves open Outdoor air damper closed Face and bypass damper bypass DX electric heat off Baseboard heat off Automatic Discharge Air Temp Failure Invalid or missing value for discharge air temper atur
61. ed standby mode The controller is placed in occupied standby mode only when a communi cated occupied request is combined with an unoccupied request from occupancy binary input BI3 In occupied standby mode the controller maintains the zone temperature based on the occupied standby heating or cooling setpoints Because the occupied standby setpoints are typically spread 2 F 1 1 C in either direction and the outdoor air damper is closed this mode reduces the demand for heating and cooling the space CNT SVX07C EN S CNT SVX07C EN Timed override control The fan will run as configured continuous or cycling for occupied mode The controller always uses the stored default setpoint values config urable using the Rover service tool regardless of hard wired or commu nicated setpoint values In addition the outdoor air damper uses the Economizer Occupied Standby Minimum Position setpoint to reduce the ventilation rate Occupied bypass mode The controller is placed in occupied bypass mode when the controller is operating in the unoccupied mode and either the timed override ON but ton on the Trane zone sensor is pressed or the controller receives a com municated occupied bypass signal from a BAS In occupied bypass mode the controller maintains the zone temperature based on the occupied heating or cooling setpoints The fan will run as configured continuous or cycling The outdoor air damper will close when the fan is
62. emperature falls below the Discharge Air Control Point Low Limit configurable using the Rover service tool and cooling capacity is at a minimum available heating capacity will be used to raise the discharge air temperature to the low limit see Discharge air temper ing on page 39 Simplified zone control In the unoccupied mode the controller maintains the zone temperature by calculating the required heating or cooling capacity 0 100 accord ing to the measured zone temperature and the active zone temperature setpoint The active zone temperature setpoint is determined by the cur rent operating modes which include occupancy and heat cool modes 38 CNT SVX07C EN S CNT SVX07C EN Discharge air tempering Discharge air tempering If the controller is in cooling mode cascade zone control initiates a dis charge air tempering function when the discharge air temperature falls below the Discharge Air Control Point Low Limit configurable using the Rover service tool and all cooling capacity is at a minimum The dis charge air tempering function allows the controller to provide heating capacity if available to raise the discharge air temperature to the Dis charge Air Control Point Low Limit The discharge air tempering function is often initiated under the follow ing circumstances Cold outdoor air is brought in through the outdoor air damper when the damper is at a high minimum position causing the dischar
63. en to occupied minimum position Open to occupied standby minimum position Open to occupied standby minimum position Closed Closed Outdoor air temperature present and economizing possible Economizing damper controlled between occupied minimum position and 10096 Economizing damper controlled between occupied standby minimum position and 10096 Open and economizing during unit operation oth erwise closed Outdoor air temperature present and economizing not possible Open to occupied mini mum position Open to occupied standby minimum position 1 For an explanation of the economizing feature see Economizing free cooling on page 45 Closed 44 CNT SVX07C EN S Modulating outdoor return dampers ASHRAE Cycle 1 conformance Tracer ZN521 applications with an outside air damper support ASHRAE Cycle 1 conformance ASHRAE Cycle 1 operation admits 100 outdoor air at all times except during a warm up cycle A tri state modulating damper actuator is required for this operation For Tracer ZN521 ASHRAE Cycle 1 conformance configure the minimum position of the economizer setpoint to 100 open during occupied periods If the zone temperature drops 3 F 1 7 C below the active zone temperature set point the Tracer ZN521 closes the outdoor air damper regardless of the minimum position setpoint ASHRAE Cycle 2 conformance Tracer ZN521 controller applicati
64. er Enable Setpoint is less than 10 the exhaust output is energized if the outdoor air damper position is at the setpoint and de energized at 0 Valve operation The Tracer ZN521 zone controller supports one or two tri state modulat ing or two position valves depending on the application see Table 8 The controller opens and closes the appropriate valve s to maintain the active zone temperature setpoint at the heating setpoint in heating mode or the cooling setpoint in cooling mode see Cascade zone control on page 38 For face and bypass applications one or two isolation valves are controlled TI Tri state ma Isolation Application modulating o pesto two position Hydronic steam fan coils and blower coils x x Unit ventilators with valve control x Face and bypass unit ventilators x 42 Modulating valve operation The Tracer ZN521 supports tri state modulating valve control Two binary outputs control each valve one to drive the valve open and one to drive the valve closed The stroke time for each valve is configurable using the Rover service tool The controller supports heating cooling or heat cool changeover with a single valve coil for two pipe applications The controller supports cooling or heat cool changeover with the main valve coil and heating only with the auxiliary valve coil for four pipe applications The controller moves the modulating valve to the desired positions based on heat
65. es 4 Occupancy input 15 Occupancy modes 36 General 36 Occupied 36 Occupied bypass 37 Occupied standby 36 Unoccupied 36 Operating environment 11 Outdoor air damper Troubleshooting 66 Outdoor air temperature Failure diagnostic 60 Input 18 Outdoor air temperature input 18 Outdoor return air dampers 43 Output devices 4 CNT SVX07C EN Overriding binary outputs 22 General 52 P Peer to peer communication 48 Power transformers 4 7 Power wiring 7 Power up sequence 35 Product description 1 Protection strategies see Unit protection strategies R Random start 35 Rover service tool Adding a device 56 Configuring the controller 1 Identifying a device 56 User guide 1 Verifying LonTalk communication 56 Verifying PCMCIA communications 56 S Sensor Humidity 47 Sensors Application specific 19 CO2 5 20 Table of options 5 Water and duct temperature 4 Zone humidity 5 20 Zone temperature 4 Sequence of operations 35 50 ASHRAE Cycle 1 45 ASHRAE Cycle 2 45 Baseboard heat 47 Dehumidification 47 Discharge air temperature low limit 50 DX cooling 46 Economizing 45 Electric heat 47 Exhaust control 41 Face and bypass damper 46 Fan off delay 49 Fan operation 40 Index Fan status 49 Filter maintenance timer 50 Four pipe operation 43 Freeze avoidance 50 Freeze protection 50 Heating cooling mode 39 Isolation valve 46 Modulating valve cali
66. ewed using the Rover service tool or through a BAS Types of diagnostics Diagnostics are categorized according to the type of clearing method each uses and the type of information each provides The four categories are e Manual latching e Automatic nonlatching e Smart reset e Informational Note Clearing diagnostics refers to deleting diagnostics from the software it does not affect the problem that generated the mes sage For help with diagnosing a problem see Chapter 7 Trou bleshooting Manual latching diagnostics Manual diagnostics also referred to as latching cause the unit to shut down Manual diagnostics can be cleared from the controller in one of the following ways using the Rover service tool see Resetting a diagnostic in EMTX SVX01A EN Rover Installation Operation Program ming guide e Through a building automation system see product literature e By initiating a manual output test at the controller see Manual out put test on page 52 cycling power to the controller When the 24 Vac power to the con troller is cycled off and then on again a power up sequence occurs By turning the zone sensor fan switch to OFF and then back to any other setting This feature will be available beginning with controller software version 2 10 Automatic nonlatching diagnostics Automatic diagnostics clear automatically when the problem that gener
67. for the Tracer ZN521 zone controller Application Multiple fan speed Dehumidification Auto minimum damper adjust Face and bypass damper Valve control Economizing Auxiliary baseboard heat Electric heat 2 pipe hydronic cooling only 2 pipe hydronic heating only 2 pipe changeover 2 pipe steam only 4 pipe hydronic heating and cooling 4 pipe changeover x x 4 pipe steam chilled water X XXX Xxx DX hydronic heating Electric heat only single and two stage x x x DX steam heating DX cooling only Ix I x I XIXI LK x I KL x CNT SVX07C EN Figures 7 through 17 pages 23 through 33 show typical wiring diagrams that include all required and all optional components for typical applica tions 13 S Chapter 4 Input output functions and wiring for typical applications Binary inputs The Tracer ZN521 controller includes four binary inputs Each binary input associates an input signal of 0 Vac with open contacts and 24 Vac with closed contacts You can use the Rover service tool to configure each of the inputs as normally open or normally closed If an application does not warrant the use of a particular input configure the input as Not Used This will disable the generation of diagnostics for this function Table 3 gives the function of each
68. ge air temperature to fall below the Discharge Air Control Point Low Limit Morning warm up The morning warm up feature is initiated when the controller is in tran sition from unoccupied to occupied mode and the zone temperature is 3 F 1 7 C below the occupied heating setpoint The fan will be turned on and the outdoor air damper will remain closed The damper modulates between closed and minimum position when the zone temperature is 2 3 F 1 2 1 7 C below the active heating setpoint When the zone tem perature reaches the occupied heating setpoint the controller begins operating in the occupied mode Morning cool down The morning cool down feature is initiated when the controller is in tran sition from unoccupied to occupied and the zone temperature is 3 F 1 7 C above the occupied heating setpoint The fan will be turned on and the outdoor air damper will remain closed The damper modulates between closed and minimum position when the zone temperature is 2 3 F 1 2 1 7 C above the active cooling setpoint When the zone tem perature reaches the occupied heating setpoint the controller begins operating in the occupied mode Heating or cooling mode The heating or cooling mode can be determined in one of two ways By a communicated signal from BAS or a peer controller e Automatically as determined by the controller A communicated heating signal permits the controller to heat only A communicated cooling signal pe
69. gnostics Automatic 58 Clearing 58 CO2 Sensor Failure 60 Condensate Overflow 59 Discharge Air Temp Failure 60 Discharge Air Temp Limit 60 Entering Water Temp Failure 60 Freeze protection 60 Generic AIP Failure 61 Generic Temperature Failure 61 Humidity Input Failure 60 Informational 59 Invalid Unit Configuration 61 Latching 58 Local Fan Mode Failure 61 Local Setpoint Failure 61 Low Coil Temp Detection 59 Maintenance filter change 59 Manual 58 Nonlatching 58 Normal 61 Outdoor Air Temp Failure 60 Smart reset 59 Table 59 Types 58 40 Zone Temp Failure 59 Dimensional diagram 3 Dimensions 2 Discharge air temperature Failure diagnostic 60 Low limit diagnostic 60 Discharge air temperature input 18 Discharge air temperature low limit 50 Discharge air tempering 39 DX cooling Operation 46 Supported application 21 Troubleshooting 65 E Economizing 19 45 Electric heat Operation 47 Supported application 21 Troubleshooting 65 Entering water temperature Diagnostic 60 Input 17 Sampling function 40 Equipment supported 1 13 21 Exhaust control 41 F Fan Exhaust 41 Mode input 17 Operation 40 Supply 41 Troubleshooting 63 Fan coils 1 21 Fan off delay 49 Fan status Input 15 Switching devices 4 Unit protection 49 Filter maintenance timer 50 Four pipe operation 43 Free cooling see Economizing Freeze avoidance 19 50 Freeze protection 50
70. he National Fire Proctection Association Inc Printed in the U S A 2005 American Standard Inc All rights reserved CNT SVX07C EN TRANE NOTICE Warnings and Cautions appear at appropriate sections throughout this manual Read these carefully AWARNING Indicates a potentially hazardous situation which if not avoided could result in death or serious injury ACAUTION Indicates a potentially hazardous situation which if not avoided may result in minor or moderate injury It may also be used to alert against unsafe practices CAUTION Indicates a situation that may result in equipment damage or property damage The following format and symbol conventions appear at appropriate sections throughout this manual IMPORTANT Alerts installer servicer or operator to potential actions that could cause the product or system to operate improperly but will not likely result in potential for damage Note A note may be used to make the reader aware of useful information to clarify a point or to describe options or alternatives This symbol precedes a procedure that consists of only a single step CNT SVX07C EN S CNT SVX07C EN Chapter 1 Chapter 2 Chapter 3 Chapter 4 Contents Overview and specifications 1 Product description 1 Storage 2 5 5
71. he fan is off Table 21 Outdoor air damper remains closed Probable cause Unit wiring Explanation The wiring between the controller outputs and the outdoor air damper must be present and correct for normal outdoor air damper operation Refer to applicable wiring diagram Failed end device Check damper actuator to ensure proper operation No power to the controller Diagnostic present Normal operation If the controller does not have power the outdoor air damper does not operate For the Tracer ZN521 controller to operate normally you must apply an input voltage of 24 Vac If the green LED is off continuously the controller does not have sufficient power or has failed Several diagnostics affect outdoor air damper operation For information about these diagnostics see Table 16 on page 59 The controller opens and closes the outdoor air damper based on the controller s occu pancy mode and fan status Normally the outdoor air damper is open during occupied mode when the fan is running and closed during unoccupied mode Unit configuration The controller must be properly configured based on the actual installed end devices and application If the unit configuration does not match the actual end device the outdoor air damper may not work correctly Manual output test The controller includes a manual output test sequence you can use to verify output oper ation and associated output wiring Ho
72. ic cover model dimensions and clearances Tin 25 mm 4 in 4 in 102 mm 102 1 4 in 5 625 in Bill 6 31 6 875 in 143 mm e 160 mm 175 mm 5 625 in 143 mm 2 in 51 mm 1 in 25 mm Figure 2 Metal cover model dimensions and clearances 1 875 in 48 mm 6 5 in 165 9 in 229 7 in 178 mm 2 in 2 in 51 mm 51 mm 24 in 10 37 in 1 in 610 mm 263 mm 25 mm width with ID M i k 10 25 in ___ Clearances ae 1 in 58 mm 260 mm Dimensions 25 mm width without cover CNT SVX07C EN S Agency listing compliance CE Immunity EN 50082 1 1997 EN 50082 2 1995 CE Emissions EN 50081 1 1992 CISPR 22 Class B UL and C UL 916 listed Energy management system UL 94 5V UL flammability rating for plenum use FCC Part 15 Class A ASHRAE Cycle 1 amp Cycle 2 control sequences Chapter 1 Overview and specifications Additional components The Tracer ZN521 zone controller requires the use of additional compo nents for monitoring and proper control of the associated equipment The use of specific components depends on the application These components are not included with the Tracer ZN521 zone controller Power transformer Use a UL listed Class 2 power transformer supplying a nominal 24 Vac 19 30 Vac to power both the Tracer ZN521 zone controller 14
73. ing or cooling requirements Modulating valve calibration Calibration of modulating valves is done automatically During normal operation the controller overdrives the actuator 13596 of the stroke time whenever a position of 0 or 100 is requested as part of Tracer ZN521 normal operation At power up or after a power outage the controller first drives all modulating valves and dampers to the closed position The controller calibrates to the fully closed position by overdriving the actua tor 135 of the stroke time Then the controller resumes normal operation CNT SVX07C EN S CNT SVX07C EN Modulating outdoor return air dampers Two position valve operation The Tracer ZN521 supports two position valves with a single binary out put for each valve Controllers used for two pipe applications support heating cooling or heat cool changeover with a single valve coil Control ler used for four pipe applications support cooling or heat cool changeover with a main valve coil and heating only with an auxiliary valve coil Isolation valve operation See Face and bypass damper operation on page 46 Two pipe operation For two pipe applications the Tracer ZN521 can be configured as heating only cooling only or heat cool changeover The coil can be used as the pri mary heating source and or the primary cooling source If present an electric heating element can be used only as the primary heating source in
74. ion For information about these diagnostics see Table 16 on page 59 Normal operation The controller controls compressor or electric heat outputs as needed to meet the unit capacity requirements Unit configuration The controller must be properly configured based on the actual installed end devices and application If the unit configuration does not match the actual end device DX or electric heat may not operate correctly Manual output test CNT SVX07C EN The controller includes a manual output test sequence you can use to verify output oper ation and associated output wiring However based on the current step in the test sequence the DX or electric heat outputs may be off Refer to the Manual output test on page 52 65 Chapter 7 Troubleshooting Table 20 DX or electric heat does not energize Continued Probable cause Explanation Requested mode off You can communicate a desired operating mode such as off heat and cool to the con troller If off is communicated to the controller the unit shuts off the compressor or elec tric heat Freeze avoidance When the fan is off with no demand for capacity 0 and the outdoor air temperature is below the freeze avoidance setpoint the controller disables compressors and electric heat outputs 100 to prevent coil freezing This includes unoccupied mode when there is no call for capacity or any other time t
75. n The Tracer ZN521 supports both single stage and two stage electric heat Electric heat is cycled on and off to maintain the discharge air tempera ture at the active heating setpoint Two pipe changeover units with elec tric heat use the electric heat only when hot water is not available The use of both electric and hydronic heat is not supported Baseboard heat operation When configured for baseboard heat output the controller turns on base board heat at 2 2 F 1 2 C below the active heating setpoint and turns off baseboard heat at 0 8 F 0 4 C below the active heating setpoint The range for activating the baseboard heat cannot be adjusted however the heating setpoint is configurable using the Rover service tool Baseboard heating is used most effectively when the discharge air tem perature control high limit is set below 100 F 56 C If this is done the unit heat will maintain the temperature on light load days and the base board heat will be enabled to maintain the temperature on heavier load days Dehumidification The Tracer ZN521 supports a dehumidification feature Dehumidification is possible if the following are present e Mechanical cooling is available e The heating capacity is located in the reheat position e Azone humidity sensor is connected at or a relative humidity RH value is transmitted to the controller by a BAS e The Space RH Setpoint is valid configurable using the Rover service to
76. n unoccupied mode before the occupied bypass timer expires the controller will be placed in occupied bypass mode and remain in that mode until either the CANCEL button is pressed on the Trane zone sensor or the occu pied bypass time expires 37 S Chapter 5 Sequence of operations Zone temperature control The Tracer ZN521 zone controller uses two methods of zone temperature control e Cascade zone control used in the occupied occupied bypass and occupied standby modes e Simplified zone control used in the unoccupied mode Cascade zone control Cascade zone control maintains zone temperature by controlling the dis charge air temperature to control the zone temperature The controller uses the difference between the measured zone temperature and the active zone temperature setpoint to produce a discharge air temperature setpoint The controller compares the discharge air temperature setpoint with the discharge air temperature and calculates a unit heating cooling capacity accordingly see Figure 18 The end devices outdoor air damper valves etc operate in sequence based on the unit heating cooling capac ity 0 100 Figure 18 Cascade zone control Calculated Active zone discharge air Calculated unit temperature temperature heating cooling setpoint mere setpoint gt gt Difference capacity gt Measured Measured zone discharge air temperature temperature If the discharge air t
77. naffected default fan speed Outdoor air damper unaffected Face and bypass damper unaffected DX cooling electric heat unaffected Baseboard heat unaffected Local Setpoint Failure Invalid or missing value Fan unaffected Automatic for zone temperature set Valves unaffected point reverts to default Outdoor air damper unaffected setpoint Face and bypass damper unaffected DX cooling electric heat unaffected Baseboard heat unaffected Generic Temperature Failure Invalid or missing Fan unaffected Informational generic temperature Valves unaffected value Outdoor air damper unaffected Face and bypass damper unaffected DX cooling electric heat unaffected Baseboard heat unaffected Invalid Unit Configuration Software is configured Fan off Manual improperly Valves off Outdoor air damper closed Face and bypass damper closed DX cooling electric heat off Baseboard heat off Normal On start up Fan unaffected Automatic Valves unaffected Electric heat unaffected Compressors unaffected Damper unaffected CNT SVX07C EN 61 Chapter 6 Status indicators for operation and communication 62 S CNT SVX07C EN S Chapter 7 Troubleshooting Use Table 17 through Table 22 to assist you in diagnosing any of the fol lowing operational problems that you might encounter with the Tracer ZN521 zone controller e Fan does not energize Table 17 e Valves remain closed Table 18 on page 64 e Valves remain open Table
78. nd dependant on the configuration of the controller Input output terminal wiring must meet the following requirements e All wiring must comply with the National Electrical Code and local codes Use only 18 AWG twisted pair wire with stranded tinned copper conductors Shielded wire is recommended e Binary input and output wiring must not exceed 1000 ft 300 m e Analog input wiring must not exceed 300 ft 100 m Donot run input output wires in the same wire bundle with any ac power wires For application specific wiring information and diagrams see Chapter 4 Input output functions and wiring for typical applications AC power wiring AWARNING HAZARDOUS VOLTAGE Before making line voltage electrical connections lock open the supply power disconnect switch Failure to do so may cause death or serious injury ACAUTION Make sure that the 24 Vac transformer is properly grounded Failure to do so may result in damage to equipment and or personal injury S Chapter 2 General wiring information CAUTION Complete input output wiring before applying power to the Tracer ZN521 zone controller Failure to do so may cause damage to the con troller or power transformer due to inadvertent connections to power circuits IMPORTANT Do not share 24 Vac between controllers All wiring must comply with National Electrical Code and local codes The ac power connections are in the top left corner of the Tr
79. ndby modes and for 43 Chapter 5 Sequence of operations low speed fan operation A controller can also receive BAS communi cated outdoor air damper minimum position A BAS communicated minimum position setpoint has priority over all locally configured setpoints When a communicated minimum position setpoint is not present the controller uses the configured minimum posi tion for low fan speed whenever the fan is running at low speed regard less of the occupancy state See Table 9 and Table 10 for more information about how the controller determines the position of the modulating out door air damper Table 9 Modulating outdoor air damper position setpoint determination BAS communicated e Occupancy setpoint Fan speed Active minimum setpoint Unoccupied Any value Any value 096 closed Occupied Valid Any value BAS communicated Occupied bypass Occupied standby Occupied Invalid Low Occupied low fan minimum Occupied bypass Occupied standby Occupied Invalid Medium high Occupied minimum Occupied bypass Occupied standby Invalid Medium high Occupied standby minimum Outdoor air temperature Table 10 Relationship between outdoor temperature sensors and damper position Modulating outdoor air damper position Occupied or occupied bypass Occupied standby Unoccupied No or invalid outdoor air temperature Failed outdoor air sensor Open to occupied minimum position Op
80. nergizes at step 4 If configured for a 2 speed fan the low fan speed output er at step 4 If configured for a 1 speed fan the fan remains on high speed at step 4 If the unit is configured for a 1 or 2 speed fan the exhaust fan output energizes on step 7 The exhaust fan output is shared with medium fai After step 10 the manual output test performs an exit which initiates a reset to restore the controller to normal operation CNT SVX07C EN 55 S Chapter 6 Status indicators for operation and communication 56 Service pin button The Service pin button is located as shown in Figure 19 on page 51 The Service pin button is used to Identify a device see Identifying a device in the Rover Installation Operation Programming guide EMTX SVX01A EN Add a device to the active group see Adding a device in EMTX SVX01A EN Verify PCMCIA communications see Verifying PCMCIA communi cations in EMTX SVX01A EN Make the green status LED wink to verify that the controller is communicating on the link see Table 14 on page 57 and Setting the Auto wink option in EMTX SVX01A EN Interpreting LEDs The red service LED on the Tracer ZN521 controller see Figure 19 on page 51 indicates whether the controller is capable of operating normally see Table 13 Table 13 Red LED Service indicator LED activity Explanation LED is on continuously when power The controller is not w
81. nformance 45 Economizing free 45 Two position control of a modulating outdoor air damper 46 Face and bypass damper 46 Face and bypass isolation valve operation 46 DX cooling 46 Electric heat 47 Baseboard heat 47 Dehumidification 47 Peer to peer 48 Unit protection strategies 48 Smart reset oc isis ada OR ac Ras EEE ENERE ADERE 49 Low coil temperature protection 49 Condensate 49 Fan status css 49 Fan otf delay xrel ar 49 Filter maintenance 50 Freeze avoidance 50 Freeze protection discharge air temperature low limit 50 Status indicators for operation and 51 TeSt DUON e TTE 51 Manual output 1 cece ee 52 Service pin Dutton 0 0 cette 56 Interpreting LEDs 56 Diagnostics orrec
82. ng single stage e Electric heat two stages It is designed to be field installed and is sent from the factory unconfig ured Use the PC based Rover service tool to configure the controller for specific applications Note For information about using the Rover service tool see the Rover Installation Operation Programming guide EMTX SVX01A EN S Chapter 1 Overview and specifications Storage environment If a Tracer ZN521 zone controller is to be stored for a substantial amount of time store it in an indoor environment that meets the following requirements Temperature 40 to 185 F 40 to 85 C e Relative humidity 5 95 noncondensing Dimensions Plastic cover model dimensions For complete dimensional drawing see Figure 1 on page 3 e Height 5 375 in 137 mm e Width 6 875 in 175 mm Depth 2 in 51 mm Metal cover model dimensions For complete dimensional drawing see Figure 2 on page 3 e Height 9 0 in 25 mm e Width 10 37in 263 mm Depth 2 25 in 58 mm Clearances Plastic cover model see Figure 1 on page 3 Front 4 0 in 102 mm e Each side 1 0 in 25 mm Top and bottom 4 0 in 102 mm Metal cover model see Figure 2 on page 3 e Front 24 0 in 610 mm e Each side 2 0 in 51 mm Top and bottom 1 0 in 25 mm 2 CNT SVX07C EN Figure 1 Plast
83. ng enclosure of the associated mechanical equipment Operating environment requirements Operate a Tracer ZN521 zone controller in an indoor environment that meets the following requirements e Temperature from 32 F to 140 F from 0 C to 60 C e Relative humidity 5 95 noncondensing 11 S Chapter 3 Mounting the controller 12 Mounting recommendations Mounting recommendations are as follows CAUTION Mount the Tracer ZN521 zone controller with the cover on to avoid the possibility of damaging the circuit board during installation e Mount the controller in any position other than with the front of the cover facing downward e Mount using the two 3 16 in 4 8 mm radius mounting holes provided see Figure 4 Mounting fasteners are not included e Attach the controller securely so it can withstand vibrations of associ ated HVAC equipment e When the controller is mounted in a small enclosed compartment complete all wiring connections before securing the controller in the compartment Figure 4 Mounting the Tracer ZN521 zone controller CNT SVX07C EN 4 functions and wiring for typical applications This chapter provides information about the function of inputs and out puts and examples of wiring for typical applications Applications sup ported by the Tracer ZN521 zone controller are shown in Table 2 Table 2 Typical applications
84. ns as the local hard wired temperature setpoint input for applications utilizing a Trane zone sensor with a tem perature setpoint thumbwheel The local setpoint input is configurable as enabled or disabled using the Rover service tool A setpoint value communicated by means of a LonTalk link can also be used for controllers operating on a BAS If both hard wired and communicated setpoint val ues are present the controller uses the communicated value If neither a hard wired nor a communicated setpoint value is present the controller uses the stored default setpoints configurable using the Rover service tool If a valid hard wired or communicated setpoint value is established and then is no longer present the controller generates a Setpoint Failure diagnostic FAN Fan mode input The FAN analog input functions as the local hard wired fan mode switch input for applications using the Trane zone sensor with a fan mode switch option The various fan mode switch positions off low medium high auto provide different resistances that are interpreted by the Tracer ZN521 The local fan mode switch input is configurable as enabled or disabled using the Rover service tool A communicated fan mode request via the LonTalk communications link can also be used for controllers operating on a BAS If both hard wired and communicated fan mode values are present the controller uses the communicated value If neither a hard wired nor a communicated f
85. ol e Dehumidification is enabled using the Rover service tool The controller initiates dehumidification if the zone humidity exceeds the humidity setpoint The controller continues to dehumidify until the sensed humidity falls below the setpoint minus the relative humidity off set The controller uses cooling and heating capacities simultaneously to dehumidify the space While dehumidifying the controller maintains the zone temperature at the active setpoint Note Dehumidification is not available for face and bypass applica tions and cannot be used if the unit is in the unoccupied mode Dehumidification disables the economizing function 47 S Chapter 5 Sequence of operations 48 Peer to peer communication Tracer ZN521 zone controllers have the ability to share data with other LonTalk based controllers Multiple controllers can be bound as peers using the Rover service tool to share e Setpoint e Zone temperature e Heating cooling mode Fan status e Unit capacity control Shared data is communicated from one controller to any other controller that is bound to it as a peer Applications having more than one unit serv ing a single zone can benefit by using this feature it allows multiple units to share a single zone temperature sensor and prevents multiple units from simultaneously heating and cooling Unit protection strategies The following strategies are initiated when specific conditions e
86. on 1 9 Baseboard heat Operation 47 Supported application 21 Binary inputs 14 15 Low coil temperature detection 14 BI2 Condensate overflow 14 BI3 Occupancy or generic 15 configuration options 15 BIA Fan status 15 Switching devices 4 Binary outputs 21 22 Generic 21 Manual output test 52 Output devices 4 Overriding 22 Table of supported options 21 Blower coils 1 21 Building automation system communication 1 9 C CE see Agency listing compliance Circuit board 51 Clearances 2 Clearing diagnostics 58 CO2 Measurement input 20 Sensor 5 20 Sensor failure diagnostic 60 Condensate overflow Diagnostic 59 Input 14 Switch 4 14 Configuration options Al3 Outdoor air temperature or generic 18 Al4 Generic CO2 measurement or RH measurement 19 BI3 Occupancy or generic 15 DX cooling 1 39 Index Electric heat 1 Face and bypass dampers 1 Outdoor return air dampers 1 Rover service tool 1 Tri state modulating dampers 1 Tri state modulating valves 1 Two position valves 1 Current sensing switches 4 D Dampers Actuators 5 Exhaust 41 Face and bypass 1 21 46 Modulating outdoor return air 43 46 Outdoor return air 1 21 41 43 Supported applications 1 21 Tri state modulating 1 Two position control 46 Data sharing 48 Dehumidification 47 Device addressing for BAS communication 9 Diagnosing operational problems 63 67 Dia
87. on page 58 For more information about how the controller operates see Chapter 5 Sequence of operations Table 4 Analog inputs M lie function ZN Zone temperature GND Zone sensor common ground SET Local setpoint FAN Fan mode input GND Auxiliary ground Entering water temperature Al2 Discharge air temperature Al3 Outdoor air temperature or generic temperature Al4 Universal 4 20 mA GND Ground terminals Use a GND terminal as the common ground for all zone sensor analog inputs ZN Zone temperature The ZN analog input functions as the local hard wired zone temperature input The controller receives the temperature as a resistance signal from a 10 kO thermistor in a standard Trane zone sensor wired to analog input ZN A zone temperature value communicated by means of a LonTalk link can also be used for controllers operating on a BAS When both a hard wired and communicated zone temperature value is present the control ler uses the communicated value If neither a hard wired nor a communi cated zone temperature value is present the controller generates a Zone Temp Failure diagnostic The ZN analog input is also used to communicate timed override requests and cancel requests to the controller for applications using a Trane zone sensor with ON and CANCEL buttons 16 CNT SVX07C EN S CNT SVX07C EN Analog inputs SET Local setpoint The SET analog input functio
88. ons with modulating outside air damper support ASHRAE Cycle 2 conformance ASHRAE Cycle 2 operation allows the modulating outdoor air damper to completely close when the zone temperature drops 3 F 1 7 C or more below the active zone temper ature setpoint If the zone temperature rises to within 2 F 1 2 C of the active setpoint the damper opens to the occupied or occupied standby minimum damper positions If the zone temperature is between 2 F and 3 F 1 2 C and 1 7 C below the active zone temperature setpoint the damper modulates between the minimum position and closed If the discharge air temperature is between the discharge air tempera ture low limit and the discharge air temperature low setpoint the damper modulates between the minimum position and closed If this situ ation is concurrent with ASHRAE Cycle 2 operation the lesser of the two setpoints will determine the actual damper position Economizing free cooling Cooling with outdoor air when the temperature is low enough to make this possible is referred to as economizing or free cooling Tracer ZN521 controller applications with modulating outside air damper support econ omizing The modulating outdoor air damper provides the first source of cooling for the Tracer ZN521 The controller initiates economizing if the outdoor air temperature is below the economizer enable point config urable using the Rover service tool If economizing is initiated the con troller
89. orking prop LED is off continuously when power The controller is operating normally is applied to the controller is applied to the controller erly or someone is pressing the Ser vice pin button LED flashes once every second The controller is not executing the application software because the net work connections and addressing have been 1 Restore the controller to normal operation using the Rover service tool Refer to EMTX SVX01A EN for more information CNT SVX07C EN S CNT SVX07C EN Interpreting LEDs The green status LED on the Tracer ZN521 controller see Figure 19 on page 51 indicates whether the controller has power applied to it and if the controller is in manual test mode see Table 14 Table 14 Green LED Status indicator LED activity Explanation LED is on continuously Power is on normal operation LED blinks one recurring blink Manual output test mode is being performed and no diagnostics are present LED blinks blinks twice as a recur ring sequence Manual output test mode is being performed and one or more diag nostics are present LED blinks 1 4 second on 1 4 second off for 10 seconds The Auto wink option is activated and the controller is communicating LED is off continuously Either the power is off the controller has malfunctioned or the Test button is being pressed and is
90. perature Low Limit The Discharge Air Temperature Low Limit is configurable using the Rover service tool During freeze protection the controller increases the heating capacity or decreases the cooling capacity in order to raise the discharge air temperature above the low limit If the discharge air temperature remains below the low limit for 3 minutes the controller generates a Discharge Air Temp Limit diagnostic See Table 16 on page 59 for the effects of this diagnostic on outputs 50 CNT SVX07C EN S 6 Status indicators for operation and communication This chapter describes the operation and communication status indica tors on the Tracer ZN521 controller including e description of the location and function of the Test button and Ser vice pin button and the light emitting diodes LEDs located on the controller e A complete list of the diagnostics that can occur their effect on con troller outputs and an explanation of how diagnostics are cleared and the device restored to normal operation Test button The Test button is used to perform the manual output test see Manual output test on page 52 which verifies that the controller output devices are operating properly It is located on the Tracer ZN521 circuit board as shown in Figure 19 You must remove the cover to access the Test button Figure 19 Tracer ZN521 zone controller circuit board Green status LED
91. polarity sensitive you can connect either terminal to either sensor lead Al2 Discharge air temperature The AI2 analog input functions as the local discharge air temperature input IMPORTANT The Tracer ZN521 cannot operate without a valid discharge air tempera ture value The controller receives the temperature as a resistance signal from a 10 kO thermistor wired to analog input AI2 The thermistor is typically located downstream from all unit heating and cooling coils at the unit dis charge area If a discharge air temperature value is invalid or is not present the con troller generates a Discharge Air Temp Failure diagnostic and shuts down the equipment When the thermistor returns to a valid tempera ture the controller automatically allows the equipment to resume normal operation Note AI2 is not polarity sensitive you can connect either terminal to either sensor lead Outdoor air temperature or generic temperature The analog input can function as either An outdoor air temperature input generic temperature input If AI3 is configured as the local hard wired outdoor air temperature input the controller receives the temperature as a resistance signal from a 10 kO thermistor wired to analog input AI3 An outdoor air tempera ture value communicated by means of a LonTalk link can also be used for controllers operating on a BAS If both hard wired and communicated outdoor air temperature val
92. properly configured based on the actual installed end devices and configuration application If the unit configuration does not match the actual end device the outdoor air damper may not work correctly Manual output test The controller includes a manual output test sequence you can use to verify output oper ation and associated output wiring However based on the current step in the test sequence the outdoor air damper may be open Refer to the Manual output test on page 52 CNT SVX07C EN 67 Chapter 7 Troubleshooting 68 CNT SVX07C EN CNT SVX07C EN Index Numerics 24 Vac wiring 7 A AC power wiring 7 Actuators Damper 5 46 Valve 4 Additional application dependent components 4 5 Addressing LonTalk communication 9 Neuron IDs 9 Agency listing compliance 3 Analog inputs 16 20 Entering water temperature 17 AI2 Discharge air temperature 18 AI3 Outdoor air temperature 18 AI3 configuration options 18 Al4 Universal 4 20 mA 19 Al4 configuration options 19 Al4 configured for CO2 measurement 20 Al4 configured for RH measurement 20 generic configuration 19 FAN Fan mode input 17 Generic temperature 18 SET Local setpoint 17 ZN Zone temperature 16 Applications 1 13 34 Applications table 13 ASHRAE Cycle 1 Agency listing compliance 4 Operation 45 ASHRAE Cycle 2 Agency listing compliance 4 Operation 45 B BAS communicati
93. rature value If the entering water temperature value is less than 5 F 2 8 C above a valid zone temperature value for hydronic heating and greater than 5 F 2 8 C below a valid zone temperature value for hydronic cooling the sampling function is enabled When the sampling function is enabled the controller opens the main hydronic valve to allow the water temperature to stabilize After 3 minutes the controller again compares the entering water temperature value to the zone temperature value to determine if the desired heating or cooling function can be accomplished If the entering water temperature value remains out of range to accomplish the desired heating cooling function the controller closes the main hydronic valve and waits 60 minutes to attempt another sampling If the entering water temperature value falls within the required range it resumes normal heating cooling operation and disables the sampling function Fan operation The Tracer ZN521 supports up to three fan speeds Every time the fan is enabled the fan will begin operation and run on high speed for a period of time 0 5 seconds for fan coils and 3 seconds for unit ventilators and blower coils before changing to any other speed This is done to provide adequate torque to start the fan motor from the off position The fan will always operate continuously while either heating or cooling during occu pied occupied standby and occupied bypass operation During unoccu pied
94. rmits the controller to cool only A com municated auto signal allows the controller to automatically change from heating to cooling and vice versa 39 S Chapter 5 Sequence of operations 40 In heating and cooling mode the controller maintains the zone tempera ture based on the active heating setpoint and the active cooling setpoint respectively The active heating and cooling setpoints are determined by the occupancy mode of the controller For two pipe and four pipe changeover units normal heat cool operation will not begin until the ability to conduct the desired heating or cooling operation is verified This is done using the entering water temperature sampling function for which a valid entering water temperature is required When neither a hard wired nor a communicated entering water temperature value is present on changeover units the controller will operate in heating mode only and assume the coil water is hot The sam pling function is not used The entering water temperature sampling function is used only for changeover applications It is used for information and troubleshooting only and does not affect the operation of the controller For more informa tion see Entering water temperature sampling function Entering water temperature sampling function The entering water temperature sampling function is used with two pipe and four pipe changeover units and requires a valid entering water tem pe
95. stead of hydronic or steam heating A changeover unit requires a valid entering water temperature value either communicated or hard wired to operate properly see AI1 Entering water temperature on page 17 and Entering water temperature sampling function on page 40 Four pipe operation For four pipe applications the Tracer ZN521 can be configured as heat cool or heat cool changeover The main coil can be used as the primary cooling source or the primary heating cooling source The auxiliary coil can be used only as the primary heating source not as a second stage of heating During normal operation the controller never uses the main coil and auxiliary coil simultaneously A changeover unit requires a valid entering water temperature value either communicated or hard wired to operate properly see AI1 Entering water temperature on page 17 and Entering water temperature sampling function on page 40 Elec tric heat control is not available on four pipe applications Modulating outdoor return air dampers The Tracer ZN521 operates the modulating outdoor return air dampers according to the following factors e Occupancy mode e Outdoor air temperature communicated or hard wired sensor Zone temperature e Setpoint e Discharge air temperature e Discharge air temperature setpoint The minimum position for an outdoor air damper is configurable using the Rover service tool for occupied and occupied sta
96. ues are present the controller uses the com municated value If a valid hard wired or communicated outdoor air tem perature value is established and then is no longer present the controller generates an Outdoor Air Temp Failure diagnostic CNT SVX07C EN S CNT SVX07C EN Analog inputs Economizing free cooling is a function whereby outdoor air is used as a source of cooling before hydronic or DX cooling is used The Tracer ZN521 uses the outdoor air temperature value to determine whether economiz ing is feasible Economizing is not possible without a valid outdoor air temperature For more information see Economizing free cooling on page 45 The outdoor air temperature value is also used for the freeze avoidance function This function is used for low coil temperature protection when the fan is off The controller enters the freeze avoidance mode when the outdoor air temperature is below the freeze avoidance setpoint config urable using the Rover service tool For more information see Freeze avoidance on page 50 If AI3 is configured as a generic temperature input it can be monitored by a BAS The controller receives the temperature as a resistance signal from a 10 kO thermistor wired to analog input AI3 The generic tempera ture input can be used with any Trane 10 kO thermistor The thermistor can be placed in any location and has no effect on the operation of the con troller The controller will
97. unicating on a network For specific information about using termi nation resistors for LonTalk applications refer to the Tracer Summit Hardware and Software Installation guide BMTX SVNO1A EN Each Tracer ZN521 zone controller has a unique 12 character alphanu meric device address for communicating on a BAS network This address referred to as a Neuron ID is assigned in the factory before the product is shipped and cannot be changed Each controller can be identified by view ing its unique Neuron ID which is on a printed label attached to the cir cuit board of the controller Additional adhesive backed peel off Neuron ID labels are tethered to the controller for placing on mechanical prints or unit location worksheets The Neuron ID will appear when communica tion is established with the Rover service tool or a BAS An example Neu ron ID is 00 01 64 1C 2B 00 Chapter 2 General wiring information 10 CNT SVX07C EN CNT SVX07C EN Chapter 3 Mounting the controller This chapter gives recommendations and requirements for mounting a Tracer ZN521 zone controller Location recommendations Trane recommends locating the Tracer ZN521 zone controller e Near the controlled piece of equipment to reduce wiring costs e Where it is easily accessible for service personnel e Where public access is restricted to minimize the possibility of tam pering or vandalism The controller can often be mounted inside the wiri
98. utomatically initiated during 2 pipe and 4 pipe changeover if the entering water temperature is either too cool or too hot for the desired heating or cooling See Al1 Entering water tempera ture on page 17 Make sure the valves are correctly configured using the Rover service tool as normally open or normally closed as dictated by the application Freeze avoidance When the fan is off with no demand for capacity 0 and the outdoor air temperature is below the freeze avoidance setpoint the controller opens the water valves 100 to pre vent coil freezing This includes unoccupied mode when there is no call for capacity or any other time the fan is off Table 20 DX or electric heat does not energize Probable cause Unit wiring Explanation The wiring between the controller outputs and the end devices must be present and cor rect for normal operation Refer to applicable wiring diagram Failed end device No power to the controller Check the control contactors or the electric heat element including any auxiliary safety interlocks to ensure proper operation If the controller does not have power heat outputs do not operate For the Tracer ZN521 controller to operate normally you must apply an input voltage of 24 Vac If the green LED is off continuously the controller does not have sufficient power or has failed Diagnostic present Several diagnostics affect DX and electric heat operat
99. wever based on the current step in the test sequence the outdoor air damper may not be open Refer to the Manual output test on page 52 Warm up and cool down sequence The controller includes both a morning warm up and cool down sequence to keep the outdoor air damper closed during the transition from unoccupied to occupied This is an attempt to bring the space under control as quickly as possible Requested mode off You can communicate a desired operating mode such as off heat or cool to the control ler If off is communicated to the controller the unit closes the outdoor air damper Table 22 Outdoor air damper remains open Probable cause Explanation Unit wiring Failed end device The wiring between the controller outputs and the outdoor air damper must be present and correct for normal outdoor air damper operation Refer to applicable wiring diagram Check damper actuator to ensure proper operation 66 CNT SVX07C EN Troubleshooting Table 22 Outdoor air damper remains open Continued Probable cause Explanation Normal The controller opens and closes the outdoor air damper based on the controller s occu operation pancy mode and fan status Normally the outdoor air damper is open during occupied mode when the fan is running and closed during unoccupied mode See Modulating outdoor return air dampers on page 43 Unit The controller must be
100. with auto changeover 25 Two pipe hydronic cooling unit 23 Two pipe hydronic heating unit 24 S 2 Zone humidity Sensor 5 Zone temperature Input 16 Sensors 4 Zone temperature control 38 Zone temperature failure diagnostic 59 CNT SVX07C EN TRANE Trane A business of American Standard Companies www trane com For more information contact your local Trane office or e mail us at comfort trane com Literature Order Number CNT SVX07C EN File Number SV ES BAS CNT SVX 07C EN 0405 Supersedes CNT SVX07B EN October 2001 Stocking Location Inland Trane has a policy of continuous product and product data improvement and reserves the right to change design and specifications without notice Only qualified technicians should perform the installa tion and servicing of equipment referred to in this publication
101. xist in order to protect the unit or building from damage Smart reset e Low coil temperature protection e Condensate overflow e Fan status e Fan off delay Filter maintenance timer e Freeze avoidance e Freeze protection discharge air temperature low limit CNT SVX07C EN S CNT SVX07C EN Unit protection strategies Smart reset The Tracer ZN521 will automatically restart a unit that is locked out as a result of a Low Coil Temp Detection BI1 diagnostic Referred to as smart reset this automatic restart will occur 30 minutes after the diag nostic occurs If the unit is successfully restarted the diagnostic is cleared If the unit undergoes another Low Coil Temp Detection diagnos tic within a 24 hour period the unit will be locked out until it is manually reset For more information on manual resetting see Manual latching diagnostics on page 58 Low coil temperature protection See BI1 Low coil temperature detection on page 14 and Smart reset above Condensate overflow See BI2 Condensate overflow on page 14 Fan status The fan status is based on the status of the binary output s dedicated to fan control The fan status is reported as high medium or low whenever the corresponding binary output is energized The fan status is reported as off whenever none of the fan binary outputs are energized Additionally a fan status switch can be connected to BI4

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