RM7895A,B,C,D/EC7895A,C; RM7896A,B,C,D 7800 SERIES RELAY MODULES
1. The EC7895C, RM7895C,D, RM7896C,D has a
delayed main valve that is energized once the RUN
period is entered.
2. The relay module is now in RUN and remains in RUN
until the controller input, terminal 6, opens, indicating
that the demand is satisfied or a limit has opened.
Post Purge (RM7896A,B,C,D Only)
After demand is satisfied or a limit opens, de-energizing
terminal 6, the Ignition/Pilot valve, main valve and delayed
main valve, terminals 8, 9 and 21, are de-energized. The
blower motor, terminal 4, remains powered for 15 seconds.
Run/Test Switch (RM/EC7895C,D; RM7896C,D only)
The Run/Test Switch is located on the top side of the relay
module, see Fig. 5. The Run/Test Switch allows the burner
sequence to be altered as follows:
1. In the measured PREPURGE sequence, the Run/Test
Switch, placed in the TEST position, causes the
PREPURGE timing to stop.
2. In the Pilot Flame Establishing Period, the Run/Test
Switch, placed in the TEST position, stops the timer
during the first eight seconds of a ten-second PFEP
selection or during the first three seconds of a
four-second PFEP selection. It also allows for pilot
turn-down test and other burner adjustments. 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 C and D relay modules if terminals
8 and 9 or 9 and 21 are jumpered.
When the relay module 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.
Fig. 5. Sequence Status LEDs.
Automation and Control Solutions
Honeywell International Inc.
Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North
35 Dynamic Drive
Golden Valley, MN 55422
G.R. Rev. 07-03
SETTINGS AND ADJUSTMENTS
Selectable Site-Configurable Jumpers
The relay module has three site-configurable jumper options,
see Fig. 6 and Table 6. If necessary, clip the site-configurable
jumpers with side cutters and remove the resistors from the
SERVICE NOTE: Clipping and removing a site-configurable
jumper enhances the level of safety.
SELECTABLE CONFIGURATION JUMPERS
(EC7895C; RM7895C,D; RM7896C,D)
Fig. 6. Selectable site-configurable jumpers.
Table 7. Site-configurable jumper options.
Pilot Flame Establishing
Flame Failure Action
Airflow Switch (ILK)
The RM7895C1020 and RM7896C1036 have fixed PFEP of
ten seconds and do not have jumper JR1.
Clipping and removing a jumper after 200 hours of
operation causes a nonresettable Fault 110. The
relay module must then be replaced.