Trane ZN.520 manual Troubleshooting, Yellow Comm LED, Red Service LED, Black Service Push Button

Page 54

Troubleshooting

Important! When viewing the Tracer ZN.520 through the Rover service tool, it is important that the version be up-to-date. To help ensure that your version is the most recent, contact you local Trane sales representative or service center.

The Service push button, located at the bottom center of the control- ler, can be used to install the Trac- er™ ZN.520 Unit Controller in a communication network. Refer to the Rover and Tracer Summit product literature for more infor- mation.

Yellow Comm LED

The yellow Comm LED blinks at the rate the controller receives communication. The yellow LED does not blink when the controller is transmitting communication data.

Table 25: Yellow comm LED activity

Led Operation

Red Service LED

Table 23: Red service LED activity

Red LED

Description

activity

LED is OFF continuously

after power is Normal operation. applied to the

controller.

LED is ON

continuously,

Someone is pressing the

even when

Service push button or

power is first

the controller has failed.

applied to the controller.

Un-install (normal controller mode). Use

Rover service tool to

LED flashes

restore the unit to

about once

normal operation. Refer

every second.

to the Rover product literature for more information.

Black Service Push

Button

Note: If the Service push button is held down for more than 15 seconds, the Tracer™ ZN.520 Unit Controller will un- install itself from the ICS communication network and shut down all unit operation. This mode is indicated by the red Service LED flashing once every second. See the Red Service LED section. Use Rover service tool to restore the unit to normal operation.

Figure 25: Black service button

Green Status LED

The green LED normally indicates whether or not the controller is powered on (24 VAC).

Table 24: Green status LED activity

Green LED

Description

activity

 

 

 

LED is ON

Power ON (normal

continuously.

operation).

 

 

LED blinks (1 blink

The controller is in

per second).

manual output test

 

mode.

 

No diagnostics

 

present.

 

 

LED blinks (2

The controller is in

blinks per second).

manual output test

 

mode.

 

One or more

 

diagnostics are

 

present.

 

 

LED blinks (1/4

Wink mode.

second on, 1/4

 

second off for 10

 

seconds).

 

 

 

LED OFF.

Power is off.

 

Controller failure.

 

Test button is

 

pressed.

 

 

Yellow LED

Description

activity

 

 

 

LED OFF

The controller is not

continuously.

detecting any

 

communication. (Normal

 

for standalone

 

applications.)

 

 

LED blinks or

The controller detects

flickers.

communication. (Normal

 

for communicating

 

applications, including

 

data sharing.)

 

 

LED ON

Abnormal condition or

continuously.

extremely high traffic on

 

the link.

 

 

Manual Output Test

The test sequence verifies output and end device operation. The manual output test can be conduct- ed to verify output wiring and actu- ator operation, without using the Rover service tool, by pressing the test button.

Figure 26: Blue test button

Many service calls are initiated due to unit diagnostics, so the test se- quence attempts to clear unit diag- nostics and restore normal unit operation prior to testing the out- puts. If the diagnostics remain after an attempt to clear diagnostics, the status LED lights in a two-blinkpat- tern, indicating the diagnostic con- dition is still present.

48

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Contents Installation Owner Diagnostics Tracer ZN.520 for Classroom Unit VentilatorStart-up Procedures Installation of New UnitsPower Up Sequence General Information Tracer ZN.520 OverviewGeneral Information Controller Circuit Board Features Tracer ZN.520 unit controller circuit boardController Features ServiceTypical Components Communication Configurations Peer-to-Peer CommunicationsIntegrated Comfort System Stand-Alone Communication InterfaceInteroperability Standard End Devices End Device SpecificationsCharacteristic DescriptionStandard End Devices Way Control Valve Time clock Zone sensor Dpdt Control Transformer Installation and Wiring SpecificationsBinary Inputs Binary Outputs Generic/baseboard Heat Binary OutputAnalog Inputs Analog inputsMounting Vertical classroom unit ventilator end pocket Wiring PowerInstalling the Wall- Mounted Zone Sensor Optional Proper zone sensor placementHumidity and CO2 Sensors Typical Wiring Diagram-Wall Mounted Zone Sensor Typical Wiring Diagram-Unit Mounted Zone Sensor Typical Wiring Diagram-Unit Input/Output Summary Input and output summaryInput/Output Summary Cooling source ConfigurationConfigurable parameters Heating sourceBinary Outputs1 Analog Inputs1 Binary input summary ConfigurationBinary Inputs1 Analog input summaryFan configuration ranges Fan ConfigurationEnd Device Configurations DefaultSetpoints Setpoint defaults Default Valid rangeDischarge air limit ranges Default Valid range Discharge Air LimitsOccupied Bypass Timer Power-Up Control WaitMaintenance Timers Location Identifier Unit Identification TagWinking Heating And Cooling Changeover Logic Power-UpUnit Operation OccupancyHeat/Cool Changeover logic Heating Operation Fan Off DelayCooling Operation Fan OperationExhaust fan/damper operation Valve OperationFace-and-Bypass Damper Operation Modulating ValvesUnit Configuration Entering Water Temperature SamplingWater assumption chart Temperature Assumed1Electric Heat Operation Economizer OperationDX Operation Baseboard Heat OperationFan Status Filter Status/ Maintenance TimerOutput Overrides Other ModesData Sharing-LonWorks Simple data sharing applicationMore complex data sharing application Heating And Cooling Changeover Logic Heat/Cool Changeover logic Cooling Operation Valve Operation Entering Water Temperature Sampling Economizer Operation Output Overrides Data Sharing-LonWorks More complex data sharing application Black Service Push Button TroubleshootingRed Service LED Yellow Comm LEDTest Procedure Exit6Troubleshooting Discharge Air Temperature Limit Space Temperature FailureEntering Water Temperature Failure Outdoor Air Temperature FailureDiagnostics Troubleshooting Translating Multiple Diagnostics Rover service tool FansValves Valves stay closed Probable cause Possible ExplanationValves stay open Probable cause Possible Explanation DX/Electric Heat Outside Air DamperOutdoor air damper stays closed Probable cause Explanation Outdoor air damper stays open Probable Cause ExplanationTracer ZN.520 Unit Controller Replacement Replacing Circuit BoardsHardwired Thermistor Values Hardwired Setpoint AdjustmentFan Switch Resistance Values AppendixBinary configuration details Binary input or output Appendix-Binary ConfigurationBinary Configuration FunctionAppendix-Unit Operation Heat/cool mode input NviHeatCoolEffective heat/ cool mode output nvoHeatCool Unit Operation Based On The Effective HEAT/COOL OutputAppendix-Unit Operation Data Lists Configuration properties1Appendix-Data Lists Input/output listing1Set the Time and Day Setting the Time ClockAppendix-Timeclock Set the ProgramReview and Change Programs Override Program Manual OperationAppendix-Timeclock Appendix-Location Identifier Location Identifier Location Identifier Location Identifier Trane Company
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