Principal Technical Features - Honeywell 7800 SERIES Installation Instructions Manual

SEQUENCE
STATUS
LED PANEL
RESET
BUTTON
KEYBOARD
DISPLAY
MODULE

PRINCIPAL TECHNICAL FEATURES

The RM7838A provides all customary flame safeguard
functions as well as significant advancements in safety,
annunciation, and system diagnostics.
Safety Shutdown (Lockout) Occurs If:
1. INITIATE Period
a. Purge card is not installed or removed.
b. Purge card is bad.
c. Configuration jumper was changed (after 200
hours).
d. AC line power errors, see Operation.
e. Four minute INITIATE period is exceeded.
2. STANDBY Period
a. Flame signal is present after 40 seconds.
b. Intermittent pilot valve/ 1st stage oil terminal is
energized.
c. Start Switch terminal energized.
d. Main valve terminal is energized.
e. Internal system fault.
WIRING
SUBBASE
RUN/TEST
SWITCH
RELAY
MODULE
CONFIGURATION
JUMPERS
PURGE
TIMER
POWE R
PILOT
FLAME
MAIN
ALARM
RESET
SC RO LL
MO DE
- SA VE -
Fig. 3. RM7838A Relay Module exploded view.
RM7838A 7800 SERIES RELAY MODULES
H O N E Y W E LL
f. Purge card is not installed or removed.
g. Purge card is bad.
h. Flame detected during the last two seconds.
3. PURGE Period
a. Flame signal detected during PURGE .
b. High fire switch fails to close within four minutes,
15 seconds after the burner switch, limit and
interlock string is closed.
c. Intermittent pilot valve/1st stage oil terminal is
energized.
d. Main valve terminal is energized.
e. Internal system fault.
f. Purge card is removed.
g. Purge card is bad.
h. Start Switch terminal is energized.
4. PILOT FLAME ESTABLISHING Period (PFEP)
a. Intermittent pilot valve/1st stage oil terminal is not
energized.
b. No flame is present at end of PFEP.
c. Internal system fault.
d. Purge card is not installed or removed.
e. Purge card is bad.
f. Main valve terminal is energized.
9
CAPTIVE
MOUNTING
SCREW
FLAME
AMPLIFIER
M12300
66-1087—2