98
SCXF-SVX01T-EN
Category Diagnostic
Reason for
Diagnostic
The unit is reading a signal that is out of range for the return air humidity sensor (humidity < 5% or humidity > 100%).
Reaction
The economizer enable r.e. enthalpy function reverts to reference enthalpy changeover (“Level 2”) control.
Reset
Required
(PMR) An automatic reset occurs after the RA humidity input returns to its allowable range continuously for 10 seconds.
Return Air Temperature Sensor Failure
Problem
On units with the comparative enthalpy option, the return air temperature sensor input is out of range.
Check
Sensor resistance should be between 830 ohms (200°F) and 345.7 ohms (-40°F). If so, check field/unit wiring between the sensor and ECEM.
Reason for
Diagnostic
The unit is reading a signal that is out of range for the return air humidity sensor (temp < -55°F or temp > 209°F).
Reaction
The economizer enable r.e. enthalpy function reverts to reference enthalpy changeover (“Level 2”) control.
Reset
Required
(PAR) An automatic reset occurs after the RA temp input returns to its allowable range continuously for 10 seconds.
RTM Auxiliary Temperature Sensor Failure
Problem
The RTM auxiliary temperature sensor data is out of range.
Check
Sensor resistance should be between 830 ohms (200°F)and 345.7 ohms (-40°F). If so, check field/unit wiring between sensor and RTM.
Reason for
Diagnostic
At least one enabled unit function has the RTM auxiliary temperature input designated as its sensor, and the unit is reading a signal that is out
of range for this input (temp. < -55°F or temp > 209°F).
Controls
Reaction
The functions with the RTM auxiliary temperature input designated as their sensor are disabled.
Reset
Required
(PAR) an automatic reset occurs after the designated zone temperature signal returns to its allowable range. To prevent rapid cycling of the
diagnostic, there is a 10 second delay before the automatic reset.
RTM Data Storage Error
Problem There was a data transmission error.
Check
This can be caused by an intermittent power loss. Turn the unit off for 1-2 minutes, then back on again. If diagnostic persists, then the RTM
may need to be replaced.
Reason for
Diagnostic
An error occurred while the RTM was writing data to its internal non-volitile memory (EEPROM).
Controls
Reaction
An information only diagnostic will be displayed at the human interface.
Reset
Required
(INFO) A manual reset may be made at the human interface, at Tracer Summit, or by cycling power to the RTM.
RTM Zone Sensor Failure
Problem
The RTM zone temperature sensor input is out of range.
Check
Sensor resistance should be between 830 ohms (200°F) and 345.7 ohms (-40°F). If so, check field/unit wiring between sensor and RTM.
Reason for
Diagnostic
At least one enabled unit function has the RTM zone temperature input designated as its sensor, and the unit is reading a signal that is out of
range for this input (temp. < -55°F or temp > 150°F).
Controls
Reaction
The functions with the RTM zone temperature input designated as their sensor are disabled.
Reset
Required
(PAR) an automatic reset occurs after the designated zone temperature signal returns to its allowable range. To prevent rapid cycling of the
diagnostic, there is a 10 second delay before the automatic reset.
S
SCM Communication Failure
Problem The RTM has lost communication with the SCM.
Check
Check field/unit wiring between the RTM and SCM.
Diagnostics
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