Troubleshooting - Honeywell 7800 Series Product Data

7800 SERIES S7800B DISPLAY MODULE
Selectable Message (Second Line)
(second-line-message)<
Fault Cycle
Fault Hours
Fault Code
fault —message<
sequence—message<
(second-line-message)<
Diagnostic Info↔
Device
Device Suffix
Run/Test Sw.
Operating Control (OperControl)
Interlock
Pilot Valve
Main Valve
Ignition
LowFire Sw
HighFireSw
Preignition Interlock (PreIgn ILK)
Pilot Valve/First Stage
Oil Valve/START (Valv/Start)
Jumper 1
Jumper 2
Jumper 3
Amplifier Type (Amp Type)
Flame Response
Purge Time
Manufacturing Code (Mfg Code)
Software Revision (SW Rev.)
Expanded Annun.↔
Remote Command
a
1 = ON (Powered); 0 = OFF (Not Powered).

TROUBLESHOOTING

After the S7800B Display Module is installed, return the 7800
SERIES to normal operation, restore power and run the
system through at least one complete automatic cycle. For
complete Troubleshooting and System Checkout information,
see form 65-0118.
7800 Series System Diagnostics
Troubleshooting control system equipment failures is made
easier with the 7800 SERIES self-diagnostics and first-out
annunciation. The S7800B provides visual annunciation by
displaying a fault code and fault or hold message at the
S7800B Display Module 128 x 64 pixel LCD.
Self-diagnostics of the 7800 SERIES enables it to detect and
annunciate both external and internal system problems. Internal
faults and external faults such as interlock failures, flame
failures and false flame signals are annunciated by the S7800B
Display Module LCD via the 7800 SERIES Relay Module.
65-0219—1
Table 1. Selectable Messages (Continued).
Display Value (Second Line)
nnnnn<
nnnnn<
nnn<
RM78nnx or EC78nnx<
nnnn<
RUN or TEST<
T6 =1 or 0<
T7 =1 or 0<
T8 =1 or 0<
T9 =1 or 0<
T10 =1 or 0<
T18 =1 or 0<
T19 =1 or 0<
T20 =1 or 0<
T21 =1 or 0<
INTACT or CLIPPED<
INTACT or CLIPPED<
INTACT or CLIPPED<
STANDARD or AMP-CHECK or
SHUTTER
0.8s, 1s, 2s or 3s<
mm:ss<
nnnn<
nnnn/nnnn<
Not Connected
NONE/HOLD/HF/LF
The LCD displays a sequence status message indicating as
appropriate: STANDBY, PREPURGE, PREIGNITION,
SAFETY 1, PILOT IGN, PILOT STAB., MAIN TRIAL, RUN and
POSTPURGE. The selectable messages also provide visual
indication of current status and historical status of the
equipment such as: Flame Signal, Total Cycles, Total Hours,
Fault History, and Diagnostic Information. With this
information, most problems can be diagnosed without
extensive trial and error testing.
The S7800B provides Diagnostic Information to aid the service
mechanic in obtaining information when troubleshooting the
system; see Table 2 to access historical and diagnostic
information. Information available in the Diagnostic Information
includes Device Type, Device Suffix, Software Revision,
Manufacturing Code, Flame Amplifier Type, Flame Failure
Response Time, Selectable Jumper Configuration Status,
Run/Test Switch Status and Terminal Status.
8
a
First Line Message
↓H5
↓H6
↓H6
↓H6
↓H6
↓H6
↓H6
↓DI
↓DI
↓DI
↓DI
↓DI
↓DI
↓DI
↓DI
↓DI
↓DI
↓DI
↓DI
↓DI
↓DI
↓DI
↓DI
↓DI
↓DI
↓DI
↓DI