Alarms and Troubleshooting
54 RRU-SVX01F-EN
Table 15. Troubleshooting guide for flame relays during problem of safety shutdown (lockout)
Occurs In Occurs If
Initiate Period • Purge card is not installed or removed
• Purge card is bad
• Configuration jumpers have been changed (after 200 hours)
• AC line power errors occurred
• Four minute INITIATE period has been exceeded
Standby Period • Airflow lockout feature is enabled and the airflow switch does not close after ten seconds or within
the specified purge card timing
• Flame signal is detected after 30 seconds
• Ignition/pilot valve/intermittent pilot valve terminal is energized
• Main valve terminal is energized
• Delayed (2
nd
stage) main valve terminal is energized (RM7895C, D/EC7895C, RM7896C/D)
• Internal system fault occurred
• Purge card is removed
• Purge card is bad
Prepurge Period • Airflow lockout feature is enabled and the airflow switch opens
• Ignition/pilot valve terminal is not energized
• No flame present at end of PFEP
• Main valve terminal is energized
• Delayed main valve terminal is energized (RM7895C/D)
• Internal system fault occurred
• Purge card is removed
• Purge card is bad
Pilot Flame Establishing Period (PFEP) • Airflow lockout feature is enabled and the airflow switch does not close after 10 seconds or within
the specified purge card timing
• Flame signal is detected after 30 seconds
• Ignition/pilot valve/intermittent pilot valve terminal is energized
• Main valve terminal is energized.
• Delayed (2
nd
stage) main valve terminal is energized (RM7895C/D, EC7895C, RM7896C/D)
• Internal system fault occurred
• Purge card is removed
• Purge card is bad
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