Taco Electronic Solutions iWorx ZXU1, Installation Manual

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iWorx® ZXU1
502-007, Effective: May 30, 2013 19
© 2013 Taco Electronic Solutions, Inc.
Troubleshooting Tips
This section describes common issues and how to resolve them.
Getting Help
Components within an iWorx® controller, sensor, or power supply cannot be field repaired. If there is a problem with a unit,
follow the steps below before contacting your local TES representative or TES technical service.
1.Make sure controllers, sensors, and power supplies are connected and communicating to desired devices.
2.Record precise hardware setup indicating the following:
Version numbers of application software.
Device and/or firmware version number.
A complete description of difficulties encountered.
REPRESENTATIONS AND WARRANTIES
This Document is subject to change from time to time at the sole discretion of Taco Electronic Solutions, Inc. All updates to
the Document are available at www.taco-hvac.com. When installing this product, it is the reader’s responsibility to ensure
that the latest version of the Document is being used.
Problem Solution
Controller is not running and Status
LED is not illuminated. No power to controller. Verify the voltage on the controller’s power connector (24
VAC).
How do I reset the controller? The controller can be reset by the LCI, or you can cycle power to the controller.
Refer to the LCI documentation for more information on resetting the controller
using the LCI.
The Mixing Valve will not open. There are several reasons the mixing valve will not open, and all should be
checked.
– Is there a valid Heating or Cooling demand?
– Is the controller in an occupied mode and is the temp below or above the Unoc-
cupied Setpoints?
– Is the RWT below the Boiler Protection setting?
The pilot relays will not come on even
though the LCI indicates it is on. Ensure that the controller and output pilot relay have been powered with 24 VAC
and the output has been correctly wired to the coil of the pilot relay.
Also ensure that the pilot relay has a 24 VAC coil.
The 10K thermistor reading is at its
maximum or minimum. The input is either shorted or open.
The Boiler is not being enabled when
there is a demand. Has the ZXU1 been associated to the BLM series controller?
Is the controller in WWSD?
If using the Heating Demand output to enable a non-networked heat source
ensure it is properly wired to the heat sources demand input.
The Chiller is not being enabled when
there is a demand. Has the Cooling Demand output been properly wired to the cooling source?
Ensure the wiring is correct.
Why is my RWT sensor tracking that of
the associated BLM series controller? If associated to a BLM series controller the ZXU1 will use the RWT sensor of the
BLM.
Do I need to populate the OAT sensor
when associating to a BLM series con-
troller or if I have an ASM2 on the net-
work. No, the ZXU1 will use the OAT value of the associated BLM or networked ASM2
controller.