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Selectable
Message/Display
Flame Signal
Total Cycles
Total Hours
Fault History >
(Six most recent faults)
Fault Cycle
H1
Fault Hours
H1
Fault Code
H1
*Fault Message*
!
H1
Sequence Message
!
H1
(Second Line Message)
!
H1
Diagnostic Information >
Device
Device Suffix
Run/Test Sw.
OperControl
T6 Operating Control Input.
Interlock
T7 Running/Lockout Interlock.
Pilot Valve
Main Valve
Ignition
LowFire Sw
HighFireSw
PreIgn ILK
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Table 3. Selectable Messages .
Description
Flame signal strength.
Total number of equipment
operating cycles.
Total number of equipment
operating hours.
First level prompt for history
information. Has subset level.
!
Cycle when fault occurred.
!
Run hour when fault occurred. 0 - 99,999
!
Number that identifies the
reason for lockout.
Indicates cause of lockout.
Indicates where in the
sequence the lockout
occurred.
Second line message explains
any further information that is
available from the 7800
SERIES or may be blank if
there is not a preemptive
second-line. H2...H6 etc.
First level prompt for
diagnostic information. Has
subset level.
Device type number.
Device suffix number.
Position of Run/Test Switch.
T8 Pilot Valve.
T9 Main Fuel Valve.
T10 Ignition.
T18 Low Fire Switch.
T19 High Fire Switch.
T20 or T17
b
Preignition
Interlock
7800 SERIES S7800A KEYBOARD DISPLAY MODULE
Possible States/ Range
(Terminals)
0 - 5.0 Vdc Flame Amp (+ and
- (Com))
0 - 99,999
a
(250,000) cycles
0 - 99,999
a
(250,000) hours
—
0 - 99,999 cycles (250,000)
cycles
a
(250,000) hours
0 - 999
—
—
—
—
RM78XXX or EC78XXX
nnnn
RUN or TEST
= 1 or 0
= 1 or 0
= 1 or 0
= 1 or 0
= 1 or 0
= 1 or 0
= 1 or 0
= 1 or 0
9
Comments
Flame relay pull-in and drop-
out value 1.25 Vdc.
Cycle will be updated each
time main valve is energized.
Hour will be updated each time
main valve output is energized
for 60 minutes.
—
—
—
—
—
—
—
—
—
—
Indicates if 7800 SERIES is in
RUN or TEST mode.
Indicates if input is on or off,
energized or de-energized.
Indicates if input is on (1) or off
(0), energized or de-energized.
Indicates if output terminal is
on or off, energized or
de-energized.
Indicates if output terminal is
on or off, energized or
de-energized.
Indicates if output terminal is
on or off, energized or de-
energized.
Indicates if input is on or off,
energized or de-energized.
Indicates if input is on or off,
energized or de-energized.
Indicates if input is on or off,
energized or de-energized.
65-0090—4
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