Section 5 – SR-2 Diagnostics
SPECIAL CONSIDERATIONS
Pretrip Alarm Codes
If an alarm occurs during a Pretrip Test the alarm code will be displayed as Pretrip Alarm XX, where XX is the
alarm code.
Switching modes from Diesel to Electric and Electric to Diesel
If a shutdown alarm occurs that affects only diesel mode operation and the unit is switched to electric, the diesel
mode shutdown alarm becomes an electric mode log alarm. This allows the unit to run in electric mode without
clearing the shutdown alarm that is preventing diesel mode operation. If the unit is switched back to diesel mode,
the alarm again become a diesel mode shutdown alarm and prevents unit operation.
In the same manner, if a shutdown alarm occurs that affects only electric mode operation and the unit is switched to
diesel, the electric mode shutdown alarm becomes a diesel mode log alarm to allow diesel mode operation. If the
unit is switched back to electric mode, the alarm reverts to an electric mode shutdown alarm and prevents unit
operation. If the unit is configured for electric to diesel autoswitch, it automatically starts and runs in diesel mode if
an electric shutdown occurs.
Clearing Alarm Codes
Most alarm codes can be cleared conventionally from the Alarm Menu using the CLEAR key.
The following control and display sensor alarm codes can only be cleared from the Maintenance Menu or Guarded
Access Menu:
• Alarm Code 03 Check (Control) Return Air Sensor
• Alarm Code 04 Check (Control) Discharge Air Sensor
• Alarm Code 203 Check Display Return Air Sensor
• Alarm Code 204 Check Display Discharge Air Sensor
The following alarm codes clear automatically.
• Alarm Code 64 Pretrip Reminder – Clears when a Pretrip Test is performed.
• Alarm Code 91 Check Electric Ready Input – Clears automatically when the unit starts running.
• Alarm Code 92 Sensor Grades Not Set – Clears when the sensor grade is changed from 5H.
5-8
02 February 2005
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