Appendix C: Setup Of Post Purge - Honeywell S7800A1142 Manual

7800 SERIES S7800A1142 KEYBOARD DISPLAY MODULE
APPENDIX C
Setup of Post Purge
NOTE: An S7800A1142, Keyboard Display Module (KDM), is
required for the setup of the RM78XX Post Purge Timing.
When the RM78XX is installed and powered, "STANDBY" will
be shown on the first line of the display (Fig. 114).
Fig. 113. Setup Needed screen.
1. Scroll down until "Setup" is displayed in the second line.
2. Enter the setup sub-routine by pressing the far right key
on the display.
Fig. 114. Entering the setup sub-routine.
The second line reads "BC Password".
3. Use the up/down arrows to enter the first number, 7.
4. Use the far right key to shift over one space.
5. Use the up/down arrows to enter the second number, 8.
6. Press Enter (left and right arrows simultaneously).
7. To select the next screen, press the down arrow key;
"Getting Data" will be momentarily displayed, followed by
the screen shown in Fig. 119.
IMPORTANT:
You will need to scroll through the Valve Proving Test
Setup (see Appendix B) to get to this screen.
Fig. 115. Setting Post Purge time.
This screen allows for setting up the Postpurge timings. This
will be the time that the Combustion Fan (terminal 5) will
remain energized after the Stop Switch/Limit (terminal 6) is
interrupted. This time will run concurrent with Valve Proving
Test if After, Both, or Split option is selected.
Use the up arrow to increase the postpurge time.
Time increases:
0 to 60 seconds in 1 second intervals.
60 to 600 seconds in 10 second intervals.
10 to 60 minutes in 1 minute intervals.
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8. Press Enter when the correct postpurge time is
displayed.
Fig. 116. Save Changes screen.
9. Use down arrow to save changes. "Getting Data" is
displayed momentarily.
The following steps are used to confirm your selection.
Fig. 117. Confirm Postpurge time.
1. Press Enter.
Fig. 118. Confirm correct/incorrect screen.
2. Press the down arrow to confirm the correct postpurge
time. "Getting Data" will be displayed until the screen in
Fig. 119 appears.
Fig. 119. Setup Done screen.
3. Go to the RM7897 and press and hold the reset button
for five seconds to program the postpurge time into the
relay module.
The Release Reset screen will appear on the KDM.
Fig. 120. Release Reset screen.
Changing the postpurge time feature is still possible. With the
RM in Standby, scrolling to the Setup line and entering with the
password allows the settings to be changed.
Once the system is in operation, the settings of the postpurge
time can be viewed under Diagnostics, using your S7800
Keyboard Display Module.
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