Submittal Sheet

7800 SERIES S7800A2142 KEYBOARD DISPLAY MODULE
13 32-00110—05
The S7800 provides diagnostic information to aid the service mechanic in obtaining information when troubleshooting
the system. See Table 4 for information on accessing historical and diagnostic selectable messages. Information
available in the Diagnostic Information includes Device Type, Software Revision, Manufacturing Code, Flame Amplifier
Type, Flame Failure Response Time (FFRT), Selectable Jumper Configuration Status, Run/Test Switch Status and
Terminal Status.
Information from the above table and Table 5 are viewable in the display module. The troubleshooting guide can be
accessed from the Display Menu (see Fig. 13). A menu is displayed that permits access to these different sections of the
guide:
•Introduction
•Faults
• Sequence and Status Hold messages
Fig. 13. Troubleshooting guide menu
The Introduction section contains brief troubleshooting tips and is presented in a scrollable paragraph form for reading
using the up and down arrow buttons (see Fig. 14). The navigation bar contains the following commands that can be
selected using the right and left arrow buttons:
• “Faults” – go to Troubleshooting guide Faults section
• “Exit” – exit Introduction section and return back to Troubleshooting guide menu
• “Sequence” – go to Troubleshooting guide Sequence/Status Hold section
Pressing the OK button executes the command with the current input focus.
Fig. 14. Troubleshooting guide introduction
The Faults section presents a description and recommended actions for each fault that the burner control module may
have (see Fig. 15). The information is presented for a single fault code and when more lines are needed to display the
information than can fit on the page, the up and down arrow buttons are used to scroll through the lines.
RESET/ALARM TEST The KDM indicates the burner status, RESET/ALARM TEST. This condition indicates that the
reset button is pressed. If it is held for more than four seconds, the alarm output is energized.
The alarm output is de-energized when the reset button is released.
Additional Sequence Status Information When An Expanded Annunciator is Connected to the Relay Module:
BURNER OFF: T6
(Burner Switch)
The KDM indicates the Burner Switch is not closed. The burner sequence does not advance to
PREPURGE until the Burner Switch closes.
STANDBY The KDM indicates the burner status, STANDBY, and that the Operating Control is not closed.
The burner sequence does not advance to PREPURGE until the Operating Control closes.
STANDBY HOLD: T6
(EA Hold Message)
The KDM indicates the burner status, STANDBY, and that a limit is not closed. The burner
sequence does not advance to PREPURGE until one or all limits close downstream from the
Operating Control.
STANDBY HOLD: T6
(Circuit Fault)
The KDM indicates the burner status, STANDBY, and that the control input is not closed. The
burner sequence does not advance to PREPURGE until the control input closes.
Table 3. Keyboard Display Module Sequence and Status Hold Messages (Continued).
Sequence Status