iWorx® VAV Series
502-011, Effective: March 16, 2011
13
© 2011 Taco Electronic Solutions, Inc.
Getting Help
Components within an iWorx® VAV Series controller cannot be field repaired. If there is a problem with a controller, fol-
low the steps below before contacting your local TES representative or TES technical service.
1.Make sure controllers are connected and communicating to desired devices.
2.Record precise hardware setup indicating the following:
Version numbers of applications software.
Controller firmware version number.
A complete description of difficulties encountered.
Notes:
What is the maximum number of VAV
Series controllers that the LCI can
support?
Since VAV Series controllers require either a VPU2 or MPU2 controlling the air-handling
unit, the LCI can support up to 32 VAVD controllers per MPU2 and up to 60 VAVI con-
trollers per VPU2. Remember the LCI can only support a maximum of 63 controllers.
When will the damper be controlled to
the minimum flow value?
The damper will be controlled to the minimum flow value when the space temperature is
satisfied.
Is there any provision for an air bal-
ancer to override the VAV box
damper?
Yes, using the LCI there is a mode that an air balancer can manipulate the damper or
set it to maintain a specified flow.
My VAV Series boxes are not enter-
ing heating or cooling mode.
Have the controllers been grouped with an VPU2 or MPU2? Have you sent the group-
ing information to the controllers?
My temperature and flow readings
are fluctuating rapidly.
Verify that the VAV Series is properly grounded. There must be a wire jumper between
terminals T9 and T10.
Controller is not in stand alone mode,
even though it has been ungrouped.
The VAV Series does not automatically re-enter stand alone mode when it is deleted
from a VPU2 or MPU2’s group. Manually place the VAV Series in stand alone mode
from the “System Options” screen of the LCI, and reset the controller.
Controller is operating as if in stand
alone mode, even though it is
grouped.
If the VAV Series has been manually switched to stand alone mode, it does not auto-
matically exit stand alone mode when it is added to a VPU2 or MPU2’s group. Switch
“Stand Alone Mode” to “Off” on the “System Options” screen of the LCI, and reset the
controller.
Changes to system options are not
taking effect.
To prevent inadvertent changes to the functionality of the VAV Series, the controller
must be reset after any changes on the “System Options” screen of the LCI.
Problem
Solution
