Unit installation

Diagnostics
100 SCXF-SVX01K-EN
T
LCI Module Comm Failure
Problem:The RTM has lost communication with the LCI.
Check: Check field/unit wiring between RTM and LCI
module.
Reason for Diagnostic:The RTM has lost communication
with the LCI module.
UCM Reaction: All active commands and setpoints
provided byTracer Summit through the LCI will be
cancelled and/or ignored. And where Tracer Summit has
been designated as setpoint source, local HI default
setpoints will be used.
Reset Required: (PAR) An automatic reset occurs after
communication has been restored.
Tracer Communications Failure
Problem: LCI has lost communication withTracer Summit.
Check:Tracer Summit (building control panel) is powered
up and running properly. If so, check unit wiring between
LCI andTracer Summit (building control panel).
Reason for Diagnostic:The LCI has lost communications
withTracer Summit for > 15 minutes.
UCM Reaction: All active commands and setpoints
provided byTracer Summit through the LCI will be
cancelled and/or ignored. And where Tracer Summit has
been designated as the setpoint source, local HI default
setpoints are used.
Reset Required: (PAR) An automatic reset occurs after
communication betweenTracer Summit and the LCI 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 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 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 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: RTM has lost communication with
VCM.
UCM 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).