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118 SCXG-SVX01B-EN
Diagnostic
Troubleshooting Diagnostics
Reason for Diagnostic: The TCI has lost
communications with Tracer Summit
®
for
> 15 minutes.
UCM’s Reaction: All active commands
and setpoints provided by Tracer
Summit
®
through the TCI will be
cancelled and/or ignored. And where
Tracer vSummit
®
has been designated as
the setpoint source, local HI default
setpoints are used.
Reset Required: (PAR) An automatic reset
occurs after communication between
Tracer Summit
®
and the TCI is restored.
U
Unit HI Communications Failure
Problem: The RTM has lost
communication with the unit mounted
(local) human interface (HI).
Check: Field/unit wiring between RTM
hand local HI.
Reason for Diagnostic: The RTM has lost
communication with the unit-mounted
human interface.
UCM’s Reaction: A fail-safe function in the
HI will cause the following sequence:
a. disallow any interaction between the HI
and the RTM (or any other modules),
b. render all HI keystrokes ineffective
c. cause the following message to display
on the unit-mounted HI display: “Local
HI communications loss. Check comm
link wiring between modules.” If the
unit has a remote HI option, then this
diagnostic will display as any other
automatic reset diagnostic.
Reset Required: (INFO) An automatic
reset occurs after communication is
restored between the RTM and the HI.
When the failure screen clears, the
general display restores to allow the HI to
interact with the RTM again.
Unoccupied Zone Cool Setpoint Failure
Problem: The unoccupied zone cooling
setpoint input is out of range.
Reason for Diagnostic: The input
designated as the unoccupied zone
cooling setpoint source is out of range
(Temp < 45 F or Temp > 94 F).
UCM’s Reaction: The active unoccupied
zone cooling setpoint reverts to the
default value.
Reset Required: (PAR) An automatic reset
occurs after the designated unoccupied
zone cool setpoint input returns to its
allowable range for 10 continuous
seconds, or after the user defines a
different, valid unoccupied zone cool
setpoint selection source.
Unoccupied Zone Heat Setpoint Failure
Problem: The unoccupied zone heating
setpoint input is out of range.
Reason for Diagnostic: The input
designated as unoccupied zone heating
setpoint source is out of range (temp < 45
F or temp > 94 F).
UCM’s Reaction: The active unoccupied
zone heating setpoint reverts to the
default value.
Reset Required: (PAR) An automatic reset
occurs after the designated unoccupied
zone heat setpoint input returns to its
allowable range for 10 continuous
seconds, or after the user defines a
different, valid unoccupied zone heating
setpoint selection source.
V
VCM Communication Failure
Problem: The RTM has lost
communication with the VCM.
Verify: Check field/unit wiring between
RTM and VCM.
Reason for Diagnostic: The RTM has lost
communication with the VCM.
UCM’s Reaction: All active commands
and setpoints provided by the VCM are
canceled and/or ignored. A fail-safe
function in the VCM will cause all outputs
to deenergize and/or set to zero. The
outside air damper minimum position
function will revert to using the O/A flow
compensation function if O/A flow
compensation is enabled or set to the
default minimum position function if O/A
flow compensation is disabled or not
available.
Reset Required: (PAR) An automatic reset
occurs after communication is restored.
communications with the VOM.
Velocity Pressure Sensor Failure
Problem: The velocity pressure input
signal is out of range.
Check: Check field/unit wiring between
sensor and VCM.
Reason for Diagnostic: The unit is reading
a signal that is out of range for the
velocity pressure transducer input
(during calibration: V < 40 mV or V > 420
mV, during operation: V < 40 mV or V >
0.75 V).
UCM’s Reaction: The minimum airflow
control function is disabled. The outside
air damper minimum position function
reverts to using the O/A flow
compensation function if O/A flow
compensation is enabled or to the default
minimum position function if O/A flow
compensation is disabled or not available.
Reset Required: (PAR) An automatic reset
occurs after the designated space
pressure transducer sends a signal within
range for 10 continuous seconds.
VOM Communications Failure
Problem: The RTM has lost
communication with the VCM.
Check: Field/unit wiring between RTM
and VCM.
Reason for Diagnostic: The RTM has lost
communications with the VOM.
UCM’s Reaction: Ventilation override
actions will not be allowed, and the VO
Output relay will be deenergized.
Reset Required: (PAR) An automatic reset
occurs after communication has been
restored.