iWorX CCU1
26
505-022, Effective: September 23, 2010
© 2010 Taco Electronic Solutions, Inc.
Troubleshooting Tips
The following table provides tips on resolving common issues.
Getting Help
Components within an iWorX CCU1 controller cannot be field repaired. If there is a problem with a controller, follow 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.
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.
Can my iWorX system contain multi-
ple CCU1 controllers?
No, the system can only recognize one.
Thermistor readings fluctuate rapidly,
sometimes by several degrees.
The controller may not be properly grounded. The controller’s ground (GND) pin (T40)
must be connected to earth ground. Also ensure that the controller’s digital inputs are
dry contacts and that no voltage is being applied or switched to the inputs.
How do I associate my other control-
lers with the CCU1?
Use the CCU1’s grouping mechanism, specifically
HVAC Setup --> Members
on the
CCU1 screen of the LCI.
What iWorX controllers can be part of
a CCU1’s group?
Only FCU series, DXU series and HPU series controllers can be part of the CCU1's
group and demand cooling from it.
Several controllers are requesting
cooling, but the chiller and pumps
have not been enabled.
The
Zone Limit
setting may be set higher than the number of zones that are currently
requesting cooling. The chiller and pumps will not be enabled until the number of zones
requesting cooling is greater than the
Zone Limit
setting.
If the number of controllers requesting cooling exceeds the
Zone Limit
setting, but the
chiller is still not enabled, the outside air temperature may be less than the
Outdoor Air
Temp. Lockout
setting.
I only have one chiller pump; how can
I disable lead/lag operation?
The lead/lag function is built into the controller and cannot be disabled. However, you
can wire both chiller pump outputs in parallel from the controller to the existing pump
and the system will operate normally. The same can be done for the condenser pump
outputs if you have only one condenser pump.
The LCI is reporting a dual pump fail-
ure. How do I know which pumps
have failed?
Check the pump alarms that precede the dual pump failure alarm. These two alarms
will indicate which two pumps have failed, the chiller pumps or the condenser pumps.
