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EC7820A 7800 SERIES RELAY MODULES
Safety Shutdown (Lockout)
Occurs If:
INITIATE Period:
1. Purge card is not installed or is removed.
2. Purge card is defective.
3. Configuration jumpers were changed (after 200 hours of
operation).
4. Ac line power errors—see Operation.
5. Four-minute INITIATE period is exceeded.
STANDBY Period:
1. Flame signal is present after 240 seconds. Preignition
Interlock is open an accumulative time of 30 seconds.
2. Airflow Switch feature is enabled and the Airflow Switch
is closed for 120 seconds with Limits and Burner Con-
trol closed.
3. Ignition/pilot valve/intermittent pilot valve terminal is
energized.
4. Main valve terminal is energized.
5. Internal system fault.
6. Purge card is not installed or is removed.
7. Purge card is defective.
8. Lockout Input opens during STANDBY.
PURGE Period:
1. Preignition Interlock opens anytime during PURGE.
Flame signal detected during PURGE.
2. Airflow Switch Input does not close within 10 seconds.
3. If Airflow Switch is disabled, there is no jumper between
terminals 6 and 7.
4. Airflow Switch opens during PURGE.
5. Lockout Input opens during PURGE.
6. Ignition/pilot valve/intermittent pilot valve terminal is
energized.
7. Main valve terminal is energized.
8. Internal system fault.
9. Purge card is removed.
10. Purge card is defective.
PREIGNITION Period:
1. Lockout Input opens during PREIGNITION.
2. Airflow Switch opens during PREIGNITION.
3. Preignition Interlock opens during PREIGNITION.
4. Ignition terminal is not energized.
5. Pilot valve/intermittent pilot valve terminal is energized.
6. Main valve terminal is energized.
7. Internal system fault.
8. Purge card is removed.
9. Purge card is defective.
SAFETY 1 Period:
1. Lockout Input opens during SAFETY 1.
2. Airflow Switch opens during SAFETY 1.
3. Low Fire Switch opens.
4. No flame is present at the end of SAFETY 1.
66-1091—08
NOTE: Some devices allow five ignition attempts.
5. Ignition terminal is not energized.
6. Pilot valve/intermittent pilot valve terminal is not
energized.
7. Main valve terminal is energized.
8. Internal system fault.
9. Purge card is removed.
10. Purge card is defective.
11. Preignition Interlock opens during SAFETY 1.
PILOT STAB. Period:
1. Lockout Input opens during PILOT STAB.
2. Airflow Switch opens during PILOT STAB.
3. Low Fire Switch opens.
4. No flame is present.
NOTE: Some devices allow three ignition attempts.
5. Ignition terminal is energized.
6. Pilot valve/intermittent pilot valve terminal is not
energized.
7. Main valve terminal is energized.
8. Internal system fault.
9. Purge card is removed.
10. Purge card is defective.
11. Preignition Interlock opens during PILOT STAB.
MAIN TRIAL Period:
1. Lockout Input opens during MAIN TRIAL.
2. Airflow Switch opens during MAIN TRIAL.
3. Low Fire Switch opens.
4. No flame is present.
NOTE: Some devices allow five ignition attempts.
5. Ignition terminal is energized.
6. Pilot valve/intermittent pilot valve terminal is not
energized.
7. Pilot valve is energized during MAIN TRIAL
stabilization.
8. Main valve terminal is not energized.
9. Internal system fault.
10. Purge card is removed.
11. Purge card is defective.
RUN Period:
1. No flame is present.
NOTE: Some devices allow five ignition attempts.
2. Lockout Input opens.
3. Ignition/interrupted pilot valve terminal is energized.
4. Main valve terminal is not energized.
5. Internal system fault.
6. Purge card is removed.
7. Purge card is defective.
8. Airflow Switch opens.
10
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