Taco Electronic Solutions iWorx HPU2, Installation Manual

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iWorx® HPU Series
12 502-025, Effective: April 17, 2013
© 2013 Taco Electronic Solutions, Inc.
TROUBLESHOOTING TIPS
This section provides remedies for common problems.
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.
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 infor-
mation on resetting the controller using the LCI.
The fan will not cycle on after the equipment
status input alarm has been resolved If the controller was previously in a fan fault condition, the con-
troller must be reset before proper operation can be restored.
The fan and heat/cool pilot relays will not come
on even though the LCI indicates it is on. Ensure that the controller and output pilot relay have been pow-
ered 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 Heat or Cool outputs will not come on even
though the space requires conditioned air. Is there water flow in the system? Verify the associated CCU2
or LHP2 controller are operating and the HPU2 is a member of
the controller. If there is no CCU2 or LHP2 connected, then the
Unit Enable input of the ASM2 must detect water flow (On).
Thermistor readings fluctuate rapidly, some-
times by several degrees. The controller is not 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 HPU controllers with the
LHP2? Use the LHP2's grouping mechanism, specifically Members on
the LHP2 HVAC Setup screen of the LCI. Only HPU controllers
may be associated with the LHP2.
What is Save for in the Members screen and
when do I press it? This button stores network information into the LHP2 about the
controllers in its group. Press this button when you have made
any changes to the grouping.
What iWorx® controllers can be part of a
LHP2's group? Only HPU controllers can be part of the LHP2's group and
demand cooling or heating from it.
Under what conditions does the HPU require a
reset for normal operation. There is one condition that requires a reset: - Equipment failure