Honeywell 7800 Series Installation Instructions Manual page 11

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.
4. PILOT FLAME ESTABLISHING PERIOD (PFEP)
RUN/TEST (C,D ONLY)
SWITCH
RELAY
MODULE
CONFIGURATION
JUMPERS
PURGE
TIMER
SEQUENCE
STATUS
LED PANEL
RM7895A,B,C,D/EC7895A,C; RM7896A,C,D7800 SERIES Relay Modules
SUBBASE Q7800A1005/U SHOWN
WIRING
SUBBASE
POWE R
PILOT
FLAME
MAIN
ALARM
RESET
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 RM7895C1020/2020 and
RM7896C1036/2036, 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.
5. MAIN FLAME ESTABLISHING PERIOD (MFEP)
(RM7895C, RM7896C,D; EC7895C)
a. Airflow lockout feature is enabled and the airflow switch
opens.
b. Ignition terminal is energized.
c. Ignition/pilot valve terminal is not energized.
d. Main valve terminal is not energized.
e. Delayed main valve terminal is energized.
11
H O N E Y W E LL
CAPTIVE
MOUNTING
SCREW
FLAME
AMPLIFIER
32-00156-03