IM 685 / Page 15
Run:
If flame is proven at the end of the 10 second ignition trial the "start" combination gas control
will remain powered and on multiple valve units, the other parallel piped main valves will become
powered. If a flameout occurs the module will recycle within 3 seconds, and initiate a new prepurge
period. If flame continues to be detected the module will be in Run until the power is interrupted to
terminal 6 indicating that the temperature control system no longer requires heat, or that the high limit
or another safety control has opened.
LED Display
There are five labeled LED’s located on the front of the RM7895A which are energized to indicate
operation as follows:
POWER
The RM7895A is powered
PILOT
The prepurge period is complete and the terminal for the "start" combination gas control
is powered.
FLAME
Flame is detected.
MAIN
The ignition trial period is complete, flame is detected, and the terminal for the
main gas valve is powered and a normal recycle is underway.
ALARM
The RM7895A is on safety lockout.
Figure 7. RM7895A Flame Safeguard
FIVE WIRE CONNECTOR FOR
COMMUNICATIONS, REMOTE
KEYBOARD DISPLAY AND
REMOTE RESET
➤
➤
DI = DIAGNOSTICS
H1 = HISTORY
EA = EXPANDED
ANNUNCIATOR
➤
➤
CAPTIVE
MOUNTING
SCREW
➤
➤
PLUG-IN
PURGE
CARD
➤
➤
KEYBOARD
DISPLAY
MODULE
➤
➤
RELAY
MODULE
➤
➤
FLAME
AMPLIFIER
➤
➤
FLAME
CURRENT
TEST JACKS
➤
➤
➤
➤
FLAME
SIMULATOR
INPUT
➤
➤
RESET
PUSH
BUTTON
➤
➤
SEQUENCE
STATUS
LEDs
➤
➤
SELECTABLE
MESSAGE OR
PREEMPTIVE
MESSAGE
➤
➤
SEQUENCE
STATUS
➤
➤
RUN/TEST
SWITCH
➤
➤
