Greenheck 7800 Series Relay Modules - Manual (Page 10)

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RM7895A,B,C,D/EC7895A,C; RM7896A,B,C,D 7800 SERIES RELAY MODULES
66-1090—2
4. Mount the RM7895A,B,C,D/EC7895A,C;
RM7896A,B,C,D by aligning the four L-shaped corner
guides and knife blade terminals with the bifurcated
contacts on the wiring subbase and securely tightening
the two screws without deforming the plastic.
Mounting Other System Components (Fig. 4)
Refer to the applicable specifications for mounting other
system components.
PRINCIPAL TECHNICAL FEATURES
The RM/EC7895, RM7896 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 jumpers have been changed (after
200 hours).
d. AC line power errors occurred, see Operation.
e. Four minute INITIATE period has been exceeded.
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 (2nd 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.
3. PREPURGE PERIOD
a. Airflow lockout feature is enabled and the airflow
switch opens.
b. Ignition/pilot valve terminal is not energized.
c. No flame present at end of PFEP.
d. Main valve terminal is energized.
e. Delayed (2nd 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.
HONEYWELL
POWER
PILOT
FLAME
MAIN
ALARM
RESET
DUST
COVER
PURGE
TIMER
WIRING
SUBBASE
CAPTIVE
MOUNTING
SCREW
RUN/TEST (C,D ONLY)
SWITCH
CONFIGURATION
JUMPERS
RELAY
MODULE
SEQUENCE
STATUS
LED PANEL
RESET
BUTTON
FLAME
AMPLIFIER
BURNER CONTROL
M15122
Fig. 4. RM7895A,B,C,D/EC7895A,C; RM7896A,B,C,D Relay Module exploded view.