Run/Test Switch - Honeywell RM7838B 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. 7.
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. 10. 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. 7. The Run/Test Switch allows the
burner sequence to be altered as follows:
DI = DIAGNOSTICS
H1 = HISTORY
EA = EXPANDED
ANNUNCIATOR
CAPTIVE
NOTE: When the RM7838B,C is switched to the TEST
MOUNTING
SCREW
PLUG-IN
PURGE
CARD
KEYBOARD
DISPLAY
MODULE
RELAY
MODULE
FLAME
AMPLIFIER
FLAME CURRENT
TEST JACKS
M7359
19
RM7838B,C 7800 SERIES RELAY MODULE
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.
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.
66-1094—08