Settings And Adjustments; Selectable Site-Configurable Jumpers; Run/Test Switch - Honeywell 7800 Series Installation Instructions Manual

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, H1—Fault
History Information, and EA—Expanded Annunciator).
When the arrow and two-letter code are displayed, it
indicates the second line is showing a selectable message
submenu. The second line displays selectable or
preemptive messages.
A selectable message supplies information for flame
strength, system status indication, system or self-
diagnostics and troubleshooting. Refer to checkout and
troubleshooting instructions; see applicable publications
listed on page 1.
A preemptive message has parentheses around the
message and supplies a detailed message to support the
sequence status information. A preemptive message can
also be a lockout message. A preemptive message
replaces a selectable message to support the sequence
status information. It also replaces a selectable message
after 60 seconds if it or a lockout message is available.
NOTE: NOTE:RM7838B,C LED provide positive visual
indication of the program sequence: POWER,
PILOT, FLAME, MAIN and ALARM. See Fig. 8.
FIVE WIRE CONNECTOR FOR
COMMUNICATIONS, REMOTE
KEYBOARD DISPLAY AND REMOTE RESET

RUN/TEST SWITCH

SEQUENCE
STATUS
SELECTABLE
MESSAGE OR
PRE-EMPTIVE
MESSAGE
SEQUENCE
STATUS
LEDs
RESET
PUSHBUTTON
FLAME
SIMULATOR INPUT
Fig. 11. Relay Module and associated system
components.
Run/Test Switch
The Run/Test Switch is located on the top side of the
RM7838B,C, see Fig. 8. The Run/Test Switch allows the
burner sequence to be altered as follows:
1. In Prepurge Drive to High Fire position, the Run/Test
Switch, when placed in the TEST position, holds in
PURGE with the firing rate motor in the High Fire
position.
2. In the measured PURGE sequence, the Run/Test
Switch, when placed in the TEST position, causes the
PURGE timing to stop. The firing rate motor is in the
High Fire position.
NOTE: When the RM7838B,C is switched to the TEST
SETTINGS AND
ADJUSTMENTS
DI = DIAGNOSTICS
Selectable Site-Configurable
H1 = HISTORY
EA = EXPANDED
Jumpers
ANNUNCIATOR
The RM7838B,C has a three site-configurable jumper
CAPTIVE
MOUNTING
option, see Fig. 9 and Table 7. If necessary, clip the site-
SCREW
configurable jumper with side cutters and remove the
PLUG-IN
resistors from the Relay Module.
PURGE
CARD
KEYBOARD
DISPLAY
MODULE
RELAY
MODULE
FLAME
AMPLIFIER
FLAME CURRENT
TEST JACKS M7359
23
RM7838B,C 7800 SERIES RELAY MODULE
3. In Purge Drive to Low Fire position, the Run/Test
Switch, when placed in the TEST position, holds the
burner sequence in PURGE with the firing rate motor
in the Low Fire position.
4. In PFEP, the Run/Test Switch, when placed in the
TEST position, stops the timer during the first eight
seconds when a ten-second PFEP is selected or
during the first three seconds when a four-second
PFEP is selected, allows pilot-turn-down test and
other burner adjustments to be made. This activates
a 15 second flameout timer that permits pilot flame
adjustment without nuisance safety shutdowns. The
Run/Test Switch is ignored during PFEP for the
RM7838B,C if terminals 8 and 9 are jumpered.
5. During Run, the Run/Test Switch, when placed in the
TEST position, drives the firing rate motor to the Low
Fire position.
mode, it stops and holds at the next Run/Test
Switch point in the operating sequence. Make
sure that the Run/Test Switch is in the RUN
position before leaving the installation.
SELECTABLE CONFIGURATION JUMPERS
RUN/TEST SWITCH
Fig. 12. Selectable site-configurable jumpers.
M7428
32-00199—01