Honeywell RM7895A Installation Instructions Manual page 10

RM7895A,B,C,D/EC7895A,C; RM7896A,B,C,D 7800 SERIES RELAY MODULES
SEQUENCE
STATUS
LED PANEL
RESET
BUTTON
DUST
COVER
Fig. 4. RM7895A,B,C,D/EC7895A,C; RM7896A,B,C,D Relay Module, exploded view.
2. STANDBY PERIOD
a. Airflow lockout feature is enabled and the airflow
switch does not close after ten seconds or within the
specified purge card timing.
b. Flame signal is detected after 30 seconds.
c. Ignition/pilot valve/intermittent pilot valve terminal is
energized.
d. Main valve terminal is energized.
e. Delayed main valve terminal is energized
(RM7895C,D).
f. Internal system fault occurred.
g. Purge card is removed.
h. Purge card is bad.
3. PREPURGE PERIOD
a. Airflow lockout feature is enabled and the airflow
switch opens.
b. Ignition/pilot valve terminal is energized.
c. Main valve terminal is energized.
d. Delayed main valve terminal is energized
(RM7895C,D).
e. Internal system fault occurred.
f. Purge card is removed.
g. Purge card is bad.
h. Flame signal is detected.
66-1090—4
WIRING
SUBBASE
RUN/TEST (C,D ONLY)
SWITCH
RELAY
MODULE
CONFIGURATION
JUMPERS
PURGE
TIMER
POWE R
PILOT
FLAM E
MAIN
ALAR M
RESE T
4. PILOT FLAME ESTABLISHING PERIOD (PFEP)
a. Airflow lockout feature is enabled and the airflow
switch opens.
b. No flame signal at end of PFEP.
c. Ignition/pilot valve/intermittent pilot valve terminal is
not energized.
NOTE: For the RM7895C1020 and RM7896C1036, during
the first 8 seconds of PFEP, when a flame signal is
detected, terminal 10 is de-energized. If the flame
signal is lost, terminal 10 will re-energize.
d. Main valve terminal is energized.
e. Delayed (second stage) main valve terminal is
energized (RM7895C,D/EC7895C; RM7896C,D).
f. Internal system fault occurred.
g. Purge card is removed.
h. Purge card is bad.
10
H O N E Y W E LL
CAPTIVE
MOUNTING
SCREW
FLAME
AMPLIFIER
M15122