26
RM7800E,G,L,M
OPERATION
Fig. 26—RM7800M sequence.
RM7800M
POWER
00
VFD
DISPLAY
OPERATING
CONTROLS
AND
INTERLOCKS
BURNER
FLAME
SIGNAL
FIRING
RATE
MOTOR
INITIATE
POWER
STANDBY
POWER
PREPURGE
POWER
PILOT
FLAME
MAIN
POWER
PFEP
4 OR 10 SEC
PILOT
FLAME
MAIN
POWER
MFEP
PILOT
FLAME
MAIN
POWER
RUN
FLAME
MAIN
POWER
POSTPURGE
POWER
STANDBY
00 00 10 25 00 1520
RM7800M SWITCHING
MOTOR ACTION
BURNER/BLOWER MOTOR
IGN.
10 SEC. IGN./PILOT
INTERMITTENT PILOT VALVE
MAIN VALVE
LIMITS AND BURNER CONTROLLER CLOSED
RUNNING INTERLOCKS CLOSED
PREIGNITION INTERLOCK CLOSED
LOW FIRE SW.
SAFE START CHECK
FLAME PROVING
21
8
10
5
5 SEC.
9
L1 6
TO
6 7TO
4
20
TO
5
18TO
13 15
TO
13 15
TO
M1926D
INTERLOCK CHECK
PILOT
TIMED
PURGE
ALARM
ALARM ALARM ALARM
LED
DISPLAY
IC
PII
SSC
KEYBOARD DISPLAY MODULE (VFD)
The first line of the Vacuum Fluorescent Display
(VFD) provides current status of the burner sequence
(STANDBY, PURGE, PILOT IGN, MAIN IGN, RUN and
POSTPURGE), timing information (PURGE, PILOT IGN,
MAIN IGN and POSTPURGE) in minutes and seconds, hold
information (PURGE HOLD: T19) and lockout information
(Lockout, Fault Code, Message and Sequence), see Fig. 27.
The extreme right side of the first line will either be blank
or it will show a small arrow pointing to the second line
followed by a two-letter code (DI-Diagnostic Information,
Hn-Fault History Information, and EA-Expanded Annun-
ciator). When the arrow and two-letter code are displayed, it
indicates the second line is showing a selectable message
submenu. The second line will display selectable or pre-
emptive messages. A selectable message supplies informa-
tion for flame strength, system status indication, system or
self-diagnostics and troubleshooting. A preemptive message
will have parentheses around the message and supply a
detailed message to support the sequence status information.
A preemptive message can also be a lockout message. A
preemptive message will replace a selectable message to
support the sequence status information. It will also replace
a selectable message after 60 seconds if it or a lockout
message is available. The RM7800 LEDs provide positive
visual indication of the program sequence: POWER, PI-
LOT, FLAME, MAIN and ALARM.
Fig. 27—Keyboard Display Module and se-
quence status LEDs (Table 3).
FIVE WIRE CONNECTOR FOR
COMMUNICATIONS, REMOTE
KEYBOARD DISPLAY AND REMOTE RESET
SEQUENCE
STATUS
SELECTABLE
MESSAGE OR
PRE-EMPTIVE
MESSAGE
SEQUENCE
STATUS
LEDs
RESET
PUSHBUTTON
FLAME
SIMULATOR INPUT
FLAME CURRENT
TEST JACKS
RUN/TEST SWITCH
DI = DIAGNOSTICS
H1 = HISTORY
EA = EXPANDED
ANNUNCIATOR
CAPTIVE
MOUNTING
SCREW
PLUG-IN
PURGE
CARD
KEYBOARD
DISPLAY
MODULE
RELAY
MODULE
FLAME
AMPLIFIER
M7359
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