Honeywell 7800 Series Manual page 46

RM7838B
TROUBLESHOOTING
Selectable Message/
Display
Flame Signal
Total Cycles
Total Hours
Fault History
(six most recent faults)
Fault Cycle
Fault Hours
Fault Code
*Fault Message*
Sequence Message
(Second Line Message)
H2...H6 etc.
Diagnostic Information
Device
Device Suffix
Run/Test Sw.
OperControl
Interlock
Pilot Valve
Main Valve
65-0120—1
TABLE 11—SELECTABLE MESSAGES (SEE TABLE 4).
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.
H1 Cycle when
fault occurred.
H1 Run hour when the
fault occurred.
H1 Number that identifies
lockout reason.
H1 Indicates lockout cause.
H1 Indicates where lockout
occurred in sequence.
H1 Explains further
information avail-
able from RM7838B
or may be blank
if no pre-emptive
second line.
First level prompt for
history information.
Has subset level.
Device type
number.
Device suffix
number.
Position of
Run/Test Switch.
T6 Recirculates
AFS/limits
Stop Switch input.
T7 Running/Lockout
Interlock.
T8 Pilot Valve.
T9 Main Fuel Valve.
Possible States/Range
(Terminals)
0 - 5.0 Vdc
Flame Amp (+
and - (Com))
0 - 99,999 cycles
0 - 99,999 hours
0 - 99,9999 cycles
0 - 99,9999 hours
0 - 999
RM7838Bx
nnnn
RUN or TEST
ON or OFF
ON or OFF
ON or OFF
ON or OFF
46
Comments
Flame relay pull-in and
drop-out value 1.25 Vdc.
A cycle will be updated
each time the main
valve is energized.
An hour will be updated
each time the main valve
output is energized for
60 minutes.
Indicates if input is on
(energized) or off
(de-energized.)
Indicates if input is on
(energized) or off
(de-energized.)
Indicates if output term-
inal is on (energized) or
off (de-energized.)
Indicates if output term-
inal is on (energized) or
off (de-energized.)
(continued)