Run/Test Switch - Honeywell RM7800L1087 Installation Instructions Manual

Keyboard Display Module Options
Vacuum Fluorescent Display (VFD)
The Keyboard Display Module (see Fig. 5) is provided with
the RM7800 Relay Module (but is not required for
operation) and is an option for the RM7840 Relay Module.
The first line of the Vacuum Fluorescent Display (VFD)
provides:
• Current status of the burner sequence (STANDBY,
PURGE, PILOT IGN, MAIN IGN, RUN and POSTPURGE).
• Timing information (PURGE, PILOT IGN, MAIN IGN and
POSTPURGE) in minutes and seconds.
• Hold information (PURGE HOLD: T19).
• 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, 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.
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.
4-Line LCD Display
The 4-line LCD Keyboard Display Module (See Fig. 5)
S7800A2142/U is available as an option for the RM7800
and RM7840 Relay Modules. This display must be
purchased separately. This display offers more lines of text
displaying the full trouble-shooting guide. (It is important
to note that this display's lower end temperature rating is
0 °F).
The first line of the Home and Lockout pages on the LCD
display use a larger font size than all other pages so that
information on them can be more easily viewed from
distances farther away from the display module (refer to
document number 32-00110 for full details on operation).
Up to 4 lines of text are displayed at a time on the page.
When the page has more than 4 lines of text to display a
scroll bar is present on the right-hand side of the page to
indicate this situation. The "Up arrow" and "Down arrow"
buttons are used to scroll up and down the lines of the
page. Each line is highlighted with a white background to
indicate that it currently has input focus for any button
RELAY MODULES WITH VALVE PROVING
actions. The scroll bar adjusts to give a relative position of
the current view with respect to all lines that the page can
display.
When a line has a right arrow symbol positioned on the
right hand side it indicates that this line can navigate to
another page, "Next page", related to the subject of the line
when that line has input focus. A "Right arrow" or "OK"
button can be pressed when the focus is on this line to
navigate to the next page.

Run/Test Switch

WARNING
Explosion Hazard.
Can cause serious injury or death.
Do not use the Run/Test switch during the Pilot
Flame Establishing Period for the RM7800L/40G,
EC7840L when using Direct Spark Function,
because it turns on the main gas valve, causing an
accumulation of fuel in the burner.
The Run/Test Switch is located on the top side of the
RM7800L/40G,L, EC7840L, see Fig. 29. The Run/Test
Switch allows the burner sequence to be altered as
follows:
1. In Pre-Purge Drive To High Fire Position
(RM7800L/40L, EC7840L), the Run/Test Switch,
when placed in the TEST position, holds in PRE-
PURGE with the firing rate motor in the High Fire
position.
2. In the measured PREPURGE sequence, the
Run/Test Switch, when placed in the TEST position,
causes the PREPURGE timing to stop. The firing rate
motor is in the High Fire (RM7800L/40L, EC7840L)
position (Run/Test Switch is ignored while the Valve
Proving test is being conducted by the
RM7800L/40L, EC7840L).
3. In Pre-Purge Drive to Low Fire position, the Run/Test
Switch, when placed in the TEST position, holds the
burner sequence in PREPURGE 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, allowing pilot-turn-down test and
other burner adjustments to be made. This activates
a fifteen second flameout timer that permits pilot
flame adjustment without nuisance safety
shutdowns. The Run/Test Switch is ignored during
PFEP for the RM7800L/40G,L, EC7840L if
Terminals 8 and 9 or 9 and 21 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.
NOTE: When RM7800L/40G,L, EC7840L is switched to
the Test 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.
21 32-00142—01