Trane SCXG-SVX01B-EN Maintenance diagnostics, RTM Data Storage Error, RTM Zone Sensor Failure

Maintenance diagnostics

RTM Aux.Temp. Sensor Failure Problem: The RTM auxillary 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 auxillary 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).

UCM Reaction: The functions with the RTM auxillliary temperataure input deignated 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 intermittant 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).

UCM 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).

UCM Reaction: The functions with the RTM zone temperataure input deignated 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.

Reason for Diagnostic: The RTM has lost communication with the SCM.

UCM Reaction: A “lockout” request is sent to the compressor staging control function. A failsafe function in the SCM will cause all SCM outputs to be zeroed and deenergized.

Reset Required: (PAR) An automatic reset occurs after communication has been restored.

Space Static Press Setpt Failure Problem: The active space static pressure setpoint is out of range.

Check: Check setpoint value. Also, if space pressure setpoint source is GBAS, but this setpoint has not been assigned to any of the four analog inputs on GBAS, this message will occur.

Reason for Diagnostic: The unit is reading a signal that is out of range for the space static pressure setpoint (input < 0.03 iwc or input > 0.20 iwc).

UCM Reaction:The default space pressure setpoint will become the active space pressure setpoint.

Reset Required: (PAR) An automatic reset occurs after the designated space pressure setpoint source sends a signal within range for 10 continuous seconds, or after a different space pressure setpoint source is user-defined.

Supply Air Pressure Sensor Failure Problem: The supply air pressure sensor voltage input is out of range.

Check: Check field/unit wiring between the sensor and RTM.

Reason for Diagnostic: The unit is reading a signal that is out of range for the supply air pressure sensor voltage input (input < 40mV or input > 4.75V)

UCM Reaction: The IGVs will drive closed, and the following functions are disabled; a. SA pressure control

b. SA static pressure limit

Reset Required: (PAR) An automatic reset occurs after the SA temp heating setpoint input returns to within range for 10 continuous seconds, or after a different SA temp heating setopint selection source is user-defined.

Supply Air Pressure Setpoint Failure Problem: The SA pressure input signal is out of range.

Reason for Diagnostic: The SA pressure setpoint input is sending a signal that is out of range (Input < 1.0 iwc or input > 4.3 iwc)

UCM Reaction: The default SA pressure setpoint will become the active SA pressure setpoint.

Reset Required: (PAR) An automatic reset occurs after the designated SA pressure setpoint source sends a signal within range for 10 continuous seconds, or after a different SA pressure setpoint source is user-defined.

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