7800 SERIES RELAY MODULES
32-00213—01 12
4. The alarm, terminal 3, is de-energized during RUN
and energized when shutdown occurs.
Keyboard Display Module (KDM)
The Keyboard Display Module (see Fig. 3) is provided with
the RM7838A Relay Module. The first line of the Vacuum
Fluorescent Display (VFD) provides:
1. Current status of the burner sequence (STANDBY,
PURGE, PILOT IGN, MAIN IGN and RUN).
2. Timing information (PURGE, PILOT IGN, and MAIN
IGN) in minutes and seconds.
3. Hold information (PURGE HOLD:T19).
4. 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; EA, Expanded Annunciator). When
the arrow and two-letter codes are displayed, it indicates
the second line is showing a selectable message
submenu. The second line displays selectable or pre-
emptive messages.
A selectable message supplies information for flame
strength, system status indication, system or self-
diagnostics and troubleshooting.
A pre-emptive message has parentheses around the
message and supplies a detailed message to support the
sequence status information. A pre-emptive message can
also be a lockout message. A pre-emptive message
replaces a selectable message to support the sequence
status information. It also replaces a selectable message
after
60 seconds or if a lockout message is available.
SETTINGS AND ADJUSTMENTS
Selectable Site-Configurable Jumpers
The RM7838A has one site-configurable jumper option,
see Fig. 4 and Table 6. If necessary, the site configurable
jumper should be clipped with side cutters and the resistor
removed from the relay module.
Fig. 5. Selectable site-configurable jumper.
NOTE: Clipping and removing a site-cofigurable-jumper
enhances the level of safetyand removing a site-
configurable-jumper after 200 hours of operation
causes a non-resettable fault 110.
Table 7. Site-Configurable Jumper Options
Jumper
Number Description Intact Clipped
JR1 Pilot Flame
Establishing
Period (PFEP)
10
seconds
4 seconds
M11502
SELECTABLE CONFIGURATION JUMPER
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