RM7800L1087; RM7840G1022,L1075; EC7840L1014 RELAY MODULES WITH VALVE PROVING
19 66-1162—2
Keyboard Display Module (VFD)
The Keyboard Display Module (see Fig. 9) is provided with the
RM7800 Relay Module (but is not required for operation) and
is an option for the RM7840/EC7840 Relay Module. 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).
• Lockout information (Lockout, Fault Code, Message and
Sequence).
The extreme right side of the first line is either blank or shows
a small arrow pointing to the second line followed by a
two-letter code (DI-Diagnostic Information, Hn-Fault History
Information, SU-Setup, SC-Setup Confirm, and EA-Expanded
Annunciator). When the arrow and two-letter code are
displayed, it indicates the second line is showing a selectable
message submenu. The second line displays selectable or
preemptive messages.
A selectable message is selected by the user to supply
information on flame strength, system status indication,
system or self-diagnostics and troubleshooting.
A preemptive message has parentheses around the message
and supplies a detailed message to support the sequence
status information. A preemptive message can also be a
lockout message. A selectable message is shown for 60
seconds after a user presses any scroll button, even if a
preemptive message (or lockout) is available. If no buttons
have been pressed for 60 seconds, then a preemptive
message will be shown.
The first line has additional details to help describe it;
otherwise the most recent selectable message will appear.
Pressing the third button on the display is a quick way to
return to the latter condition without waiting 60 seconds.
Run/Test Switch
WARNING
Explosion Hazard.
Can cause serious injury or death.
Do not use the Run/Test switch during the Pilot Flame
Establishing Period for the RM7800L/40L,
EC7840LG,M when using Direct Spark Function,
because it turns on the main gas valve, causing an
accumulation of fuel in the burner.
The Run/Test Switch is located on the top side of the
RM7800L/40L, EC7840L, see Fig. 29. The Run/Test Switch
allows the burner sequence to be altered as follows:
1. In Pre-Purge Drive To High Fire Position (RM7800L/
40L, EC7840L), the Run/Test Switch, when placed in
the TEST position, holds in PREPURGE with the firing
rate motor in the High Fire position.
2. In the measured PREPURGE sequence, the Run/Test
Switch, when placed in the TEST position, causes the
PREPURGE timing to stop. The firing rate motor is in
the High Fire (RM7800L/40L, EC7840L) position (Run/
Test Switch is ignored while the Valve Proving test is
being conducted by the RM7800L/40L, EC7840L).
3. In Pre-Purge Drive to Low Fire position, the Run/Test
Switch, when placed in the TEST position, holds the
burner sequence in PREPURGE with the firing rate
motor in the Low Fire position.
4.
In PFEP, the Run/Test Switch, when placed in the TEST
position, stops the timer during the first eight seconds
when a ten second PFEP is selected or during the first
three seconds when a four second PFEP is selected,
allowing pilot-turn-down test and other burner
adjustments to be made. This activates a fifteen second
flameout timer that permits pilot flame adjustment
without nuisance safety shutdowns. The Run/Test
Switch is ignored during PFEP for the
RM7800L/40L,
EC7840L
if Terminals 8 and 9 or 9 and 21 are jumpered.
5. During Run, the Run/Test Switch, when placed in the
TEST position, drives the firing rate motor to the Low
Fire position.
NOTE: When RM7800L/40L, EC7840L is switched to the
Test mode, it stops and holds at the next Run/Test
Switch point in the operating sequence. Make sure
that the Run/Test Switch is in the RUN position
before leaving the installation.
SETTINGS AND ADJUSTMENTS
Selectable Site-Configurable Jumpers
The RM7800L/40L, EC7840L has three site-configurable
jumper options, see Fig. 29 and Table 8. If necessary, clip the
site-configurable jumpers with side cutters and remove the
resistors from the Relay Module.
Fig. 27. Selectable site-configurable jumpers.
RUN/TEST SWITCH
NOTE: CONFIGURATION JUMPERS SHOWN FOR RM7800G/RM7840G.
SELECTABLE CONFIGURATION JUMPERS
M12301
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