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CNT-SVX04A-EN

Troubleshooting

Table 58

Test sequence for non-face and bypass unit configurations

Note

Upon entering manual output test mode, the controller turns off all fan and electric heat outputs

and drives all dampers and valves closed (if required).

Note

At the beginning of step 2, the controller attempts to clear all diagnostics.

Note

If the unit is configured for a 3-speed fan, the medium fan speed output will energize at step 3.

If the unit is configured for a 2-speed fan, the fan remains on high speed at step 3.

Note

If the unit is configured for a 3-speed fan, the medium fan speed output energizes at step 3. If

the unit is configured for a 2-speed fan, the low fan speed output engergizes at step 3. If the unit is
configured for a 1-speed fan, the fan remains on high speed at step 3.

Note

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 fan speed.

Note

After step 10, the test sequence performs an exit. This initiates a reset and attempts to return

the controller to normal operation.

Step

Fan

DX, or cool or
heat/cool
changeover
valve

Face/ bypass
damper

Electric heat, or
heat valve

Outdoor air
damper

Generic/
baseboard
heat

J1-1

J1-2

J1-3

J1-5

J1-6

J1-7

J1-8

J1-9

J1-10

J1-11

J1-12

TB4-1

Off

Hydronic: on
EH: off

Off

Fan high

High

Off

Fan med

Off

Med

Off

Fan low

Off

Low

Off

Main open, DX

High

Off

Main close, DX

off, aux open, EH1
on

High

Off

Aux open, EH1

on, exhaust fan

High

Exh

Off

Aux close, EH1

off, EH2 on,
damper open

High

Off

Damper close

High

Off

10:

Generic/

baseboard heat
energized

High

Off

11:

Exit

Summary of Contents for Tracer ZN.520

Page 1: ...CNT SVX04A EN December 2000 CNT SVX04A EN Tracer ZN 520 Unit Controller Installation Operation and Programming Guide...

Page 2: ......

Page 3: ...install and service the equipment referred to in this document Published by The Trane Company La Crosse Wisconsin Printed in USA Force Flo and Rover are trademarks of The Trane Company Tracer Tracer S...

Page 4: ......

Page 5: ...eat output 21 Output overrides 21 Analog outputs 21 Binary inputs 22 Condensate overflow 23 Low coil temperature detection 23 Fan status 23 Occupancy 24 Generic binary inpu 25 Defrost 26 Analog inputs...

Page 6: ...5 On and Cancel buttons on the zone sensor 47 Occupancy binary input 47 Modulating Cascade control 48 Heating or cooling control mode operation 49 Heating and cooling changeover logic 50 Cooling opera...

Page 7: ...alone peer to peer 80 Troubleshooting 83 LED operation 83 Manual output test 84 Diagnostics 88 Questionable unit operation 92 Appendix 97 Hardwired setpoint adjustment 97 Hardwired thermistor values 9...

Page 8: ......

Page 9: ...ints Refer to the literature for the specific equipment for available features and options The Trane family of Tracer zone controllers The Trane family of Tracer zone controllers is the next generatio...

Page 10: ...units as follows UniTrane fan coils FCA vertical concealed FCB vertical cabinet FCC horizontal concealed FCD horizontal cabinet FCE horizontal recessed FCH vertical recessed FCJ vertical slope top ca...

Page 11: ...lators in horizontal or vertical configurations Multiple sizes are available in both configurations as shown in Table 1 Table 1 Classroom unit ventilators size configurations Horizontal unit ventilato...

Page 12: ...speeds Dehumid ification Auto damper adjust Face and bypass damper Valve control Economizer damper Auxiliary heat Note 2 Entering water temperature sampling 2 pipe changeover X X X X X X X 2 pipe hot...

Page 13: ...rcuit board Figure 1 Tracer ZN 520 zone controller circuit board Communications connections Zone sensor connections Communications LED Power Generic Auto test button Service button and LED Communicati...

Page 14: ...agement System Agency compliance IEC 1000 4 2 ESD IEC 1000 4 4 EFT IEC 1000 4 5 Surge Power requirements 18 to 32 VAC 24 VAC nominal 50 or 60 Hz 570 mA AC Binary inputs Table 3 Binary inputs typically...

Page 15: ...cooling valve BI 5 J1 5 12 VA 1 VAC rms typical 24 VAC rms typical Cool close J1 6 12 VA 1 VAC rms typical 24 VAC rms typical Face bypass damper open J1 7 12 VA 1 VAC rms typical 24 VAC rms typical Fa...

Page 16: ...put 4821 to 4919 Off 2297 to 2342 Auto 10593 to 10807 Low 13177 to 13443 Medium 15137 to 16463 High Ground TB3 6 Analog ground NA Analog input 1 J3 1 Entering water temperature 40 to 212 F 40 to 100 C...

Page 17: ...pass damper baseboard heat dehumidification and generic binary output The controller also supports 1 2 and 3 speed fans with exhaust fan output on 1 and 2 speed fan applications medium fan speed outpu...

Page 18: ...ge dehumidification requires this to be in the reheat position One DX cooling stage One or two stage electric heat dehumidification requires this to be in the reheat position Face and bypass damper Mo...

Page 19: ...2 pipe changeover units electric heat will not be energized while the hydronic supply is hot 5 or more degrees above the space temperature Tables 9 22 give example usage of the binary outputs for vari...

Page 20: ...used J1 8 Not used J1 9 Electric heat stage 1 J1 10 Electric heat stage 2 J1 11 Outdoor air damper open J1 12 Outdoor air damper close TB4 1 Generic Baseboard heat output TB4 2 24 VAC J1 1 Fan high J1...

Page 21: ...7 Not used J1 8 Not used J1 9 Not used J1 10 Not used J1 11 Outdoor air damper open J1 12 Outdoor air damper close TB4 1 Generic Baseboard heat output TB4 2 24 VAC J1 1 Fan high J1 2 Fan medium Exhau...

Page 22: ...t used J1 9 Heat open J1 10 Heat close J1 11 Outdoor air damper open J1 12 Outdoor air damper close TB4 1 Generic Baseboard heat output TB4 2 24 VAC J1 1 Fan high J1 2 Fan medium Exhaust fan J1 3 Fan...

Page 23: ...sed J1 8 Not used J1 9 Not used J1 10 Not used J1 11 Outdoor air damper open J1 12 Outdoor air damper close TB4 1 Generic Baseboard heat output TB4 2 24 VAC J1 1 Fan high J1 2 Fan medium Exhaust fan J...

Page 24: ...heat stage 1 J1 10 Electric heat stage 2 J1 11 Outdoor air damper open J1 12 Outdoor air damper close TB4 1 Generic Baseboard heat output TB4 2 24 VAC J1 1 Fan High J1 2 Fan medium Exhaust fan J1 3 Fa...

Page 25: ...1 9 Heat isolation valve open close J1 10 Not used J1 11 Outdoor air damper open J1 12 Outdoor air damper close TB4 1 Generic Baseboard heat output TB4 2 24 VAC J1 1 Fan high J1 2 Fan medium Exhaust f...

Page 26: ...edium Exhaust fan J1 3 Fan low J1 4 Key J1 5 Cool isolation valve open close J1 6 Not used J1 7 Face bypass damper open J1 8 Face bypass damper close J1 9 Heat isolation valve open close J1 10 Not use...

Page 27: ...be adjusted however the heating setpoint can be changed using a Rover service tool or a Tracer Summit system Baseboard heating is most effectively used when the discharge air temperature control high...

Page 28: ...it fan and closes the water valve and outdoor air damper when present The generic binary output when present is not affected by diagnostics Table 23 Binary input configurations Note1 During Low Coil T...

Page 29: ...binary input and a low temperature detection device or freezestat detects the low temperature signal The ComfortLink zone controller can protect the coil with one binary input When the controller det...

Page 30: ...ing automation system such as Tracer Summit the hardwired occupancy binary input along with the communicated occupancy request places the controller in either occupied mode or occupied standby mode In...

Page 31: ...g Occupied Open Occupied Occupied Communicating Unoccupied Open Occupied Unoccupied Communicating Occupied Standby Open Occupied Occupied Standby Communicating Occupied Closed Unoccupied Occupied Stan...

Page 32: ...circuit and commands the triac output off Fan and economizer damper operation continue to operate defrosting the coil The control reports a Defrosting Cmpr Lockout informational diagnostic when the co...

Page 33: ...mperature Failure diagnostic Local setpoint The local setpoint input is the local hardwired setpoint input only The local setpoint is a resistive input for use with Trane zone sensors If neither a har...

Page 34: ...nsor generates the fan mode signal The Tracer ZN 520 zone controller detects the unique resistance corresponding to each position of the fan switch By measuring this resistance the controller determin...

Page 35: ...Water Temperature Failure diagnostic Discharge air temperature The Tracer ZN 520 zone controller cannot operate without a valid discharge air temperature input When the sensor returns to a valid valu...

Page 36: ...conomizing A value of Enable or Disable for nviEconEnable overrides these decisions regardless of the presence of an outdoor air temperature value Economizing is disabled in the DX mode Refer to DX op...

Page 37: ...controller can use this value to support the dehumidification function If both the hardwired and communicated relative humidity values are present the controller uses the communicated value for contro...

Page 38: ...ut and uses the communicated value Internal and external setpoint adjustment Zone sensors with an internal or external setpoint adjustment 1 k provide the Tracer ZN 520 zone controller with a local se...

Page 39: ...he following Communicated setpoint input Communicated setpoint offset Hardwired setpoint input Default setpoints Occupancy mode Heating or cooling mode Setpoint high and low limits When a building aut...

Page 40: ...e controller the controller ignores the hardwired fan switch input and uses the communicated value The zone sensor fan switch input can be enabled or disabled through configuration using the Rover ser...

Page 41: ...he controller By accessing the communication jack via Rover you gain access to any controller on the link Zone sensor wiring connections Table 30 Typical Trane zone sensor wiring connections TB1 Descr...

Page 42: ...ss controllers is possible even when a building automation system is not present You do not need to observe polarity for Comm5 communication links The controller provides six 0 25 inch quick connect t...

Page 43: ...erminals are provided for 24 VAC connection to the board Figure 3 Tracer ZN 520 zone controller power requirement Note Board terminals TB4 1 and TB4 2 are connections for the Tracer ZN 520 zone contro...

Page 44: ...5 Cool heat cool changeover modulate close J1 6 Face bypass damper modulate to face J1 7 Face bypass damper modulate to bypass J1 8 Heat modulate open 2 position heat 1st stage of electric heat J1 9 H...

Page 45: ...ller or a communicated request from a system level controller or another peer controller The controller uses the measured space temperature discharge air temperature and the control algorithm to maint...

Page 46: ...es and damper calibrate closed face and bypass damper calibrate to bypass when present Normal operation begins after 290 potentially seconds have passed Manual output test can be initiated at any time...

Page 47: ...eating or cooling mode the temperature deadband values and the heating and cooling setpoints high and low limits to determine the controller s active setpoint The controller adds the absolute setpoint...

Page 48: ...s parameter provides additional flexibility to allow you to appy communicated hardwired or default setpoints without making physical changes to the unit Table 31 Setpoint operation Method Used in the...

Page 49: ...occupied mode the unit attempts to maintain the space temperature at the active occupied heating or cooling setpoint based on the measured space temperature the discharge air temperature the active se...

Page 50: ...the controller s economizer damper position goes to the economizer standby minimum position The economizer standby minimum position can be changed using Rover service tool In the occupied standby mod...

Page 51: ...be communicated to the zone controller For complete information about the setup for Tracer Summit applications of this controller see the Tracer Summit product literature For more information on the...

Page 52: ...32 Effect of occupancy commands on the controller Note 1 Occupied bypass is initiated by either a communicated request or a local input The effective occupancy is occupied bypass Note 2 The occupancy...

Page 53: ...nt mode to unoccupied perhaps due to a change based on the system s time of day schedule the controller switches to occupied bypass mode for the remainder of the bypass time or until someone presses t...

Page 54: ...le to control the space temperature better than the simpler zone temperature control which uses only the space temperature and setpoint The Tracer ZN 520 zone controller uses cascade control while occ...

Page 55: ...to heating See Table 70 on page 103 Determining mode automatically by the controller A communicated request of Auto or the controller s default operation auto can place the unit into heating or cooli...

Page 56: ...orted 9 Fan Only no heating or cooling allowed All other enumerations will be interpreted as Auto In addition the controller can receive heat cool request inputs from communicated nviHeatCool The rela...

Page 57: ...ing or cooling plan operation is not required for heating or cooling because they are capable of providing their own local heating or cooling For 2 pipe changeover and 4 pipe changeover units with hyd...

Page 58: ...een 0 and 100 capacity the cooling outputs are controlled according to modulating valve logic modulating valves or cycled on DX and 2 position valves As the load increases modulating outputs open furt...

Page 59: ...provides heating capacity if available to raise the discharge air temperature to its low limit The discharge air tempering function is often invoked when cold outdoor air is brought in through the ou...

Page 60: ...ration see Face and bypass isolation valve operation on page 64 The Tracer ZN 520 zone controller fan output s normally run continuously during the occupied occupied bypass and occupied standby modes...

Page 61: ...r too warm to cool Entering water is cold enough to cool when it is five degrees below the measured space temperature Entering water is warm enough to heat when it is five degrees above the measured s...

Page 62: ...is unlikely the coil would drift to a high temperature unless the actual loop temperature was very high If the entering water temperature is not usable for the required capacity controller closes the...

Page 63: ...an applications the fan normally operates at the selected or default speed off high medium low auto When fan mode is auto the fan operates at the default fan speed See Table 36 on page 62 for fan oper...

Page 64: ...d only with heating or cooling Fan off delay When a heating output is controlled off the Tracer ZN 520 zone controller automatically holds the fan on for an additional 30 seconds This 30 second delay...

Page 65: ...pipe heat cool 4 pipe heat cool changeover The auxiliary valve coil is capable of providing only heating 4 pipe operation Typical 2 pipe changeover configurations allow for both cooling summer mode an...

Page 66: ...m the economizer if any Face and bypass isolation valve operation Face and bypass units may use isolation valves to prevent unwanted water flow in the coil when no air flow is present through the coil...

Page 67: ...n heat mode or at the cooling setpoint in cool mode Table 37 2 pipe main coil operation For more information about 2 pipe operation see Coil changeover on page 58 Four pipe operation Four pipe units n...

Page 68: ...the entering water temperature is appropriate to deliver the desired heating or cooling the controller selects the primary coil to deliver heating or cooling and resumes normal operation Table 38 4 pi...

Page 69: ...ate Table 39 Determining the economizer damper minimum position setpoint During occupied modes the damper remains at a minimum damper position whether a configured minimum position or communicated fro...

Page 70: ...SHRAE cycle 2 operation is only available on units equipped with a modulating outdoor air damper Economizer operation With a valid outdoor air temperature either hardwired or communicated Tracer ZN 52...

Page 71: ...d bypass damper to modulate a percentage of air to the face of the coil and around the coil bypass to maintain space comfort Isolation valves if present are used to control water flow through the unit...

Page 72: ...compressor due to low discharge air temperatures Electric heat operation The Tracer ZN 520 zone controller supports 1 or 2 stage electric heat operation for heating To control the space temperature e...

Page 73: ...rive units or direct drive units as needed The fan status switch provides feedback to the controller that the fan is in operation when the fan binary outputs are energized If the controller energizes...

Page 74: ...tomation system applications Additional information on the setup and application of this feature can be found in Stand alone peer to peer on page 84 Other modes Dehumidification Dehumidification is po...

Page 75: ...nd drives the outdoor air damper closed during freeze avoidance mode Freeze protection discharge air temperature low limit Freeze protection operation is invoked whenever the discharge air temperature...

Page 76: ...unoccupied mode In occupied bypass mode the controller uses all the occupied setpoints but reports occupied bypass as the active mode to represent the override mode Unoccupied operation is normally a...

Page 77: ...e modulating outdoor air damper closed when the controller is configured for modulating outdoor air damper control and an outdoor air damper is present for up to one hour at every transition from unoc...

Page 78: ...t ventilator Rover service tool uses the unit type fan coil blower coil or unit ventilator to determine and download many other aspects of the unit configuration such as the default analog input confi...

Page 79: ...ngeover Note 1 NA 2 pipe changeover Dedicated hydronic Steam Compressor Electric Hydronic coil changeover auxiliary coil heating Note 1 Hot 4 pipe changeover Hydronic changeover electric Note 1 NA 2 p...

Page 80: ...es the communicated water temperature to determine whether the unit can heat or cool as required Entering water temperature sampling not allowed Yes No The controller always uses the local hardwired e...

Page 81: ...r normally closed 2 position cooling 2 position cooling 2 position cooling Normally open or normally closed DX NA J1 6 Cooling valve close Cooling valve close Cooling valve close NA J1 7 NA NA Face by...

Page 82: ...he Tracer ZN 520 zone controller communicates the generic temperature value to Rover or Tracer Summit and displays it as generic temperature Description Terminals Output Rating Load Energized Load De...

Page 83: ...Default fan speed cooling Off low medium high auto Zone sensor fan switch Disable or enable Configuration Valid range Main cooling changeover valve stroke time 30 360 seconds Entering water sampling D...

Page 84: ...request The timed override timer is maintained in the unit controller When the timed override is applicable the controller reports Occupied Bypass as its effective occupancy mode The actual enumeratio...

Page 85: ...erride On request The controller always accepts this timed override On request but only changes to occupied bypass if the controller was supposed to be in unoccupied mode During unoccupied mode the On...

Page 86: ...slave data communication Data such as space temperature setpoint and occupancy can be shared from a master control to a peer control with or without the presence of Tracer Summit This communication al...

Page 87: ...other s occupancy mode For these applications you must use Rover service tool to set up the controller Refer to the Rover service tool product literature for more information Timed override Peer to p...

Page 88: ...nt or from its default setpoints Peer to peer applications often require the use of one hardwired setpoint to be shared across two or more controllers You can achieve this by wiring the adjustable set...

Page 89: ...se Rover service tool to restore the unit to normal operation Refer to the Rover Installation Operation and Programming guide EMTX SVX01A EN for more information Green status LED The green LED normall...

Page 90: ...end device operation The manual output test can be conducted to verify output wiring and actuator operation without using Rover service tool Many service calls are initiated due to diagnostics so the...

Page 91: ...t two seconds then release the button to start the test mode When manual output test mode begins the controller turns off all outputs and calibrates modulating end devices closed 2 Press the Test butt...

Page 92: ...7 The exhaust fan output is shared with medium fan speed Note 6 After step 10 the test sequence performs an exit This initiates a reset and attempts to return the controller to normal operation Step F...

Page 93: ...uence However the test sequence only permits one step per second which enforces a minimum output time LED operation The green status LED is off when you press the Test button To begin the manual outpu...

Page 94: ...e 4 Enabled Valves Enabled 3 Outdoor air damper Enabled 3 Face bypass damper Enabled 3 DX electric heat Enabled 3 Baseboard heat Off Discharge Air Temp Limit 2 Off Valves Open Outdoor air damper Close...

Page 95: ...ensor fails or is not present the controller prohibits economizer operation A value of Enable or Disable for nviEconEnable overrides these decisions regardless of the presence of an outdoor air temper...

Page 96: ...diagnostic occurs When this diagnostic occurs the controller responds as defined in Table on page 92 After the controller detects the Low Coil Temperature Detection diagnostic the unit waits 30 minut...

Page 97: ...ervice tool can reset diagnostics in the Tracer ZN 520 zone controller For more complete information refer to the Rover Installation Operation and Programming guide EMTX SVX01A EN Diagnostic reset Any...

Page 98: ...f two conditions occurs The controller exits power up control wait once it receives communicated information The controller exits power up control wait once the power up control wait time expires Diag...

Page 99: ...s a manual output test sequence you can use to verify output operation and associated output wiring However based on the current step in the test sequence the valve s may not be open Refer to Manual o...

Page 100: ...e freeze avoidance setpoint the controller opens the water valves 100 to prevent coil freezing This includes unoccupied mode when there is no call for capacity or any other time the fan is off Normal...

Page 101: ...output test on page 88 Fan mode off When a local fan mode switch provided on the Trane zone sensor determines the fan operation the off position controls the unit off and damper to close Requested mo...

Page 102: ...l output test The controller includes a manual output test sequence you can use to verify output operation and associated output wiring However based on the current step in the test sequence the unit...

Page 103: ...F 889 4 50 733 6 58 577 9 66 500 70 422 1 74 344 2 78 266 4 82 188 5 86 110 6 90 Resistance k Temperature F Resistance k Temperature F 87 5 0 10 0 77 74 6 5 9 3 80 63 8 10 8 2 85 54 6 15 7 3 90 46 9...

Page 104: ...agnostic BI 3 Occupancy Normally closed Closed BIP 3 is Normal Occupied Open BIP 3 is Active Unoccupied 1 Normally open Open BIP 3 is Normal Occupied Closed BIP 3 is Active Unoccupied 1 BI 4 Fan statu...

Page 105: ...troller Fan enabled Heating enabled Cooling enabled Damper enabled Pre cool Pre cool Fan enabled Heating disabled 1 Cooling enabled Damper disabled Off Off Fan disabled Heating disabled Cooling disabl...

Page 106: ...eating disabled 1 Cooling enabled Damper disabled Off Any state Off Fan disabled Heating disabled Cooling disabled Damper disabled Test Any state Determined by controller Fan enabled Heating enabled C...

Page 107: ...rTemp SNVT_temp_p nviFanSpeedCmd SNVT_switch nvoTerminalLoad SNVT_lev_percent nviComprEnable SNVT_switch nvoSpaceRH SNVT_lev_percent nviAuxHeatEnable SNVT_switch nvoOutdoorTemp SNVT_temp_p nviValveOve...

Page 108: ......

Page 109: ...ntering water temperature input 33 Analog input 2 Configured for discharge air temperature input 33 Analog input 3 Configured for outdoor air temperature input 34 Analog input 4 Configuration 34 Analo...

Page 110: ...t 25 Specifications 13 Building automation system Communicating setpoint to controller 37 46 Data sharing 72 C Cancel button 38 51 Canceling occupied bypass mode 38 Cascade control 52 Control algorith...

Page 111: ...e 33 Fan status 27 Low AirFlow Fan Failure 27 Low temperature detection 27 Maintenance required 72 Outdoor air temp failure 34 Resetting 94 Setpoint failure 31 Space temperature failure 31 Table 92 Di...

Page 112: ...nfiguration 81 Continuous operation 61 Cycling 62 Default speeds 60 Exhaust fan 63 Off delay 62 Operation 60 Start 62 Status 71 Troubleshooting 96 Fan mode input 32 Fan modes 32 Fan status 27 Fan swit...

Page 113: ...tivity 88 Operation during manual output test 91 Operation 87 Red 87 Blink activity 87 Yellow 88 Blink activity 88 Local setpoint 31 Low temperature detection 27 Diagnostic 27 M Manual output test 70...

Page 114: ...puts that affect occupancy mode 49 Occupied bypass mode 47 48 Initiating and canceling 38 Occupied mode 28 44 47 Occupied standby mode 28 44 47 48 On cancel buttons 38 51 Operating modes 46 Cooldown 7...

Page 115: ...g and cooling setpoints 44 Local setpoint 31 38 Sources 46 Validation sequence 32 Space temperature 31 Maintaining at active setpoints 43 Measuring using a zone sensor 31 36 Specifications 12 Standalo...

Page 116: ...dulating valve 63 Operation 63 Troubleshooting 97 98 W Water balancing 25 Water valve override 25 71 Wiring Communications wiring diagram 40 Z Zone sensor Inputs 36 Internal and external setpoint adju...

Page 117: ......

Page 118: ...fied technicians should perform the installation and servicing of equipment referred to in this publication Literature Order Number CNT SVX04A EN File Number CNT SVX04A EN 1200 Supersedes New Stocking...

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