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Sequence of operation

CNT-SVX04A-EN

71

Water valve override

For supporting water balancing, the controller includes a communication
variable (nviValveOverride) that allows a user to specify the desired state of all
water valves. The only values supported are:

■

Open

all

valves

■

Close

all

valves

To maintain the controller in valve override, this variable must be rewritten at
least once every two hours. The controller resets itself if the variable is not
refreshed within two hours or any other value except open or closed is written
to it.

Rover or another communicating device is required to access this feature.

Fan status

The status of the fan is reported based on the state 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 directed on. In all configurations,
the fan status is reported as Off when none of the fan outputs is energized.

The Tracer ZN.520 zone controller can be connected to a fan status switch
(when present on binary input 4) that provides a diagnostic for belt-drive 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 a fan output for one full minute and the fan status
switch indicates no fan operation, the controller performs a unit shutdown and
generates a Low AirFlow—Fan Failure diagnostic. The controller also generates
a Low AirFlow—Fan Failure diagnostic if the fan status switch indicates no fan
operation for one minute after the fan has been operating normally. The fan
condition and the diagnostic must be cleared before the unit is allowed to
operate. If a diagnostic reset is sent to the controller and the fan condition still
exists, the controller attempts to run the fan for one minute before generating
another diagnostic and performing a unit shutdown.

Binary input 4 (BI4) is in the closed position when the fan is in operation and is
in the open position when fan operation has stopped.

Filter status

The controller’s filter status is based on the unit fan’s cumulative run hours. The
controller compares the fan run time against an adjustable fan run hours limit
(maintenance required setpoint time, stored in the controller) and recommends
unit maintenance as required.

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Содержание Tracer ZN.520

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

Страница 2: ......

Страница 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...

Страница 4: ......

Страница 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...

Страница 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...

Страница 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...

Страница 8: ......

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 108: ......

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 117: ......

Страница 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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