Principle Technical Features - Honeywell 7800 Series Manual

PRINCIPAL TECHNICAL FEATURES
The RM7830A or RM7850A Relay Module provide all
customary flame safeguard functions while providing
significant advancements in the areas of safety, annunciation
and system diagnostics.
Safety Shutdown (Lockout) Occurs If:
INITIATE Period.
a. Purge card is not installed or removed.
b. Purge card is defective.
c. Configuration jumpers were changed
(after 200 hours of operation).
d. AC line power errors, see Operation.
e. Four minute INITIATE period is exceeded.
STANDBY Period.
a. Flame signal is present after 40 seconds.
b. Preignition Interlock is open an accumulative time
of 30 seconds.
c. Airflow Switch feature is enabled and the Airflow
Switch is closed for 120 seconds with Limits and
Burner Control closed.
d. Ignition/pilot valve/intermittent pilot valve terminal
is energized.
e. Main valve terminal is energized.
f. Internal system fault.
g. Purge card is not installed or removed.
h. Purge card is defective.
i. Lockout Input opens during STANDBY.
PURGE Period.
a. Preignition Interlock opens anytime during
PURGE.
b. Flame signal detected during PURGE.
c. High Fire Switch fails to close within five minutes
after the firing rate motor is commanded to drive
to high fire position at start of PURGE
(RM7850A).
d. Low Fire Switch fails to close within five minutes,
after firing rate motor is commanded to drive to
low fire position at end of PURGE (RM7850A) .
e. Airflow Switch Input does not close within 10
seconds.
f. If Airflow Switch is disabled, there is no jumper
between terminals 6 and 7.
g. Airflow Switch opens during PURGE.
h. Lockout Input opens during PURGE.
i. Ignition/pilot valve/intermittent pilot valve terminal
is energized.
j. Main valve terminal is energized.
k. Internal system fault.
l. Purge card is removed.
m. Purge card is defective.
PREIGNITION Period.
a. Lockout Input opens during PREIGNITION.
b. Airflow Switch opens during PREIGNITION.
c. Preignition Interlock opens during PREIGNITION.
d. Ignition terminal is not energized.
e. Pilot valve/intermittent pilot valve terminal is
energized.
f. Main valve terminal is energized.
g. Internal system fault.
h. Purge card is removed.
i. Purge card is defective.
7800 SERIES RM7830A, RM7850A RELAY MODULE
SAFETY 1 Period.
a. Lockout Input opens during SAFETY 1.
b. Airflow Switch opens during SAFETY 1.
c. Low Fire Switch opens (RM7850A).
d. No flame is present at the end of SAFETY 1.
e. Ignition terminal is not energized.
f. Pilot valve/intermittent pilot valve terminal is not
energized.
g. Main valve terminal is energized.
h. Internal system fault.
i. Purge card is removed.
j. Purge card is defective.
PILOT STAB. Period.
a. Lockout Input opens during PILOT STAB.
b. Airflow Switch opens during PILOT STAB.
c. Low Fire Switch opens (RM7850A).
d. No flame is present.
e. Ignition terminal is energized.
f. Pilot valve/intermittent pilot valve terminal is not
energized.
g. Main valve terminal is energized.
h. Internal system fault.
i. Purge card is removed.
j. Purge card is defective.
MAIN TRIAL Period.
a. Lockout Input opens during MAIN TRIAL.
b. Airflow Switch opens during MAIN TRIAL.
c. Low Fire Switch opens (RM7850A).
d. No flame is present.
e. Ignition terminal is energized.
f. Pilot valve/intermittent pilot valve terminal is not
energized.
g. Pilot valve is energized during MAIN TRIAL
stabilization.
h. Main valve terminal is not energized.
i. Internal system fault.
j. Purge card is removed.
k. Purge card is defective.
RUN Period.
a. No flame is present.
b. Lockout Input opens.
c. Ignition/interrupted pilot valve terminal is
energized.
d. Main valve terminal is not energized.
e. Internal system fault.
f. Purge card is removed.
g. Purge card is defective.
h. Airflow Switch Input opens.
POSTPURGE Period.
a. Ignition/pilot valve/intermittent pilot valve terminal
is energized.
b. Main valve terminal is energized.
c. Internal system fault.
d. Purge card is removed.
e. Purge card is defective.
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