Diagnostics
Translating Multiple
Diagnostics
The controller senses and records each diagnostic independently of the diagnostics. It is possible to have multiple diagnostics present simultaneously. The diagnostics are reported in the order they occur.
Resetting Diagnostics
1.Automatically by the controller.
2.By initiating a manual output test at the controller.
3.By cycling power to the controller.
4.Through a building automation system such as ZN510 Loop Controller.
5.Through Rover, Trane’s service tool.
6.Through any communicating device with the ability to access the controller’s alarm reset input.
Automatic Diagnostic Reset The ZN510 controller includes an automatic diagnostic reset function. This function attempts to automatically recover a unit when the following diagnostics occur:
zLow temperature detection, Circuit 1
zLow temperature detection, Circuit 2
zLow temperature detection, Circuit 1 and 2
zHigh/low pressure cutout, Circuit 1
zHigh/low pressure cutout, Circuit 2
zHigh/low pressure cutout, Circuit 1 and 2
When one or more of these special diagnostics occurs, the controller responds to the diagnostic as defined in the table 17 on page 27. After the controller detects the first special diagnostic (listed on page 27), the unit waits 30 minutes before invoking the automatic diagnostic reset function. The automatic diagnostic reset function clears all special diagnostics and attempts to restore the controller to normal operation. The controller resumes normal operation until another diagnostic occurs.
If a special diagnostic occurs within 24 hours after an automatic diagnostic reset, the diagnostic must be manually reset.
Cycling Power
When the 24 VAC power to the controller has been turned off, the unit cycles through a power up sequence. By default, the controller attempts to reset all diagnostics at power up. Diagnostics present at power up and those that occur after power up are handled according to the table on page 27.
Building Automation System (CLC)
Some building automation systems can reset diagnostics in the ZN510 controller. The ZN510 Loop Controller can reset diagnostics in the ZN510 Controller. For complete information, refer to the building automation system product literature.
Rover Service Tool
Trane’s service tool, Rover, can reset diagnostics in the ZN510 controller. For complete information about Rover, refer to the Rover product literature.
Alarm Reset
Any device that can communicate alarm reset information can reset diagnostics in the ZN510 controller.
ZN510 Controller Replacement
1.Disconnect power or disable the circuit breaker to unit.
2.Remove bad or questionable ZN510 Controller.
3.Install controller in the unit with the heatsink placement at the top of the control box. (See page 32).
4.Connect the power to the ZN510 ONLY.
5.Connect Rover and properly configure the controller, unless a previously configured board is purchased.
6.Power down.
7.Connect the remaining input and output wiring to the controller.
8.Reapply power.
9.Complete sequence 7 and 8 above in the installation section of this manual.
10.Refer to BAS manual for instructions on how to install the new ZN510 into BAS system.
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