Safety Shutdown - Honeywell 7800 Series Installation Instructions Manual

RM7845A 7800 SERIES RELAY MODULES
SEQUENCE
STATUS
LED PANEL
RESET
BUTTON
DUST
COVER

SAFETY SHUTDOWN

Safety Shutdown (Lockout) occurs if any of
the following occur during the indicated
period:
1. INITIATE Period:
a. Purge card is not installed or is removed.
b. Purge card is bad.
c. Configuration jumpers are changed (after 200 hours
of operation).
d. Ac line power errors occurred, see Operation
section.
e. Four minute INITIATE period has been exceeded.
2. STANDBY Period:
a. Flame signal is present after 240 seconds.
b. Preignition Interlock is open an accumulative time
of 30 seconds.
c. Interlock check feature is enabled and the
Interlock String (including airflow switch) is closed
for 120 seconds with controller closed.
661147—1
WIRING
SUBBASE
RUN/TEST
SWITCH
RELAY
MODULE
CONFIGURATION
JUMPERS
PURGE
TIMER
POWE R
PILOT
FLAM E
MAIN
ALAR M
RESE T
Fig. 3. RM7845A Relay Module exploded view.
d. Ignition/pilot valve/intermittent pilot valve terminal is
energized.
e. Main valve terminal is energized.
f. Internal system fault occurred.
g. Purge card is not installed or is removed.
h. Purge card is bad.
3. PREPURGE Period:
a. Preignition Interlock opens anytime during
PREPURGE period.
b. Flame signal is detected after first ten seconds
during PREPURGE.
c. High Fire Switch fails to close within four minutes
and fifteen seconds after the firing rate motor is
commanded to drive to the high fire position at the
start of PREPURGE.
d. Low Fire Switch fails to close within four minutes
and fifteen seconds after the firing rate motor is
commanded to drive to the low fire position at the
end of PREPURGE.
e. Running Interlock does not close within 30 seconds.
f. Lockout Interlock does not close within 10 seconds.
g. Lockout Interlock opens during PREPURGE.
h. Ignition/pilot valve/intermittent pilot valve terminal is
energized.
8
H O N E Y W E LL
CAPTIVE
MOUNTING
SCREW
FLAME
AMPLIFIER
M22188