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Settings And Adjustments - Honeywell RM7895A Installation Instructions Manual

7800 series relay modules
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RM7895A,B,C,D/EC7895A,C; RM7896A,B,C,D 7800 SERIES RELAY MODULES
Run
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.
IMPORTANT
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.
RUN/TEST SWITCH
SEQUENCE
STATUS
LEDs
RESET
PUSHBUTTON
FLAME
SIMULATOR INPUT
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
Scarborough, Ontario
M1V 4Z9
66-1090—4
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
relay module.
SERVICE NOTE: Clipping and removing a site-configurable
jumper enhances the level of safety.
JR1
JR2
CAPTIVE
JR3
MOUNTING
SCREW
PLUG-IN
a
PURGE
CARD
DUST
IMPORTANT
COVER
RELAY
MODULE
FLAME
AMPLIFIER
FLAME CURRENT
TEST JACKS
M7552A
SELECTABLE CONFIGURATION JUMPERS
RUN/TEST SWITCH
(EC7895C; RM7895C,D; RM7896C,D)
Fig. 6. Selectable site-configurable jumpers.
Table 7. Site-configurable jumper options.
Jumper
Number
Description
a
Pilot Flame Establishing
Period (PFEP)
Flame Failure Action
Airflow Switch (ILK)
Failure
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.
M7553A
Intact
Clipped
10
4 seconds
seconds
Lockout
Recycle
Recycle
Lockout
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