Tracer® ZN.520
Translating Multiple Diagnostics
Note 3: When the outdoor air temperature sensor has failed or is not present, the Tracer® ZN.520 controller generates a diagnostic to indicate the sensor loss condition. The controller automatically clears the diagnostic once a valid outdoor air temperature value is present
The controller senses and records each diagnostic independently of other diagnostics. It is possible to have multiple diagnostics present simultaneously. The diagnostics are reported in the order they occur.
Possible diagnostics include: |
|
• Low Temperature Detection | • Condensate Overflow |
• Low Air Flow - Fan Status | • Discharge Air Temp Limit |
• Space Temperature Failure1 | • Entering Water Temp Failure1 |
• Discharge Air Temp Failure1 | • Outdoor Air Temp Failure1 |
• Local Setpoint Failure1 | • Local Fan Mode Failure1 |
• CO2 Sensor Failure1 | • Generic AIP Failure1 |
• Humidity Input Failure1 | • Defrosting Compressor Lockout1 |
• Maintenance Required | • Invalid Unit Configuration |
• Generic temperature failure | • Discharge air low limit |
Resetting Diagnostics
80
1
There are six ways to reset unit diagnostics:
•Automatically by the controller
•By initiating a manual output test at the controller
•By cycling power to the controller
•By using a building automation system
•By using the Rover service tool
•By using any other communicating device able to access the controller’s diagnositc reset input
•By cycling the fan switch from off to any speed setting Automatically: The Tracer® ZN.520 controller includes an automatic diagnostic reset function.This function attempts to automatically recover a unit when the Low Temperature Detection diagnostic occurs.When this diagnostic occurs, the controller responds as defined in the Diagnostics table in the previous Summary section. After the controller detects the Low Temperature Detection diagnos- tic, the unit waits 30 minutes before invoking the automatic diagnostic reset function.The automatic diagnostic reset function clears the Low Temperature Detection diagnostic and attempts to restore the control- ler to normal operation.The controller resumes normal operation until another diagnostic occurs.
