RM7890A,B/EC7890A,B 7800 SERIES RELAY MODULES
9 32-00157-03
Mounting RM/EC7890 Relay
Module
1. Mount the RM/EC7890 vertically on the Q7800
Subbase, or mount horizontally with the knife blade
terminals pointing down. When mounted on the
Q7800A, the RM/EC7890 must be in an electrical
enclosure.
2. When mounting in an electrical enclosure, provide
adequate clearance for servicing, installation and
removal of the RM/EC7890, KDM, flame amplifier,
flame amplifier signal voltage probes, electrical
signal voltage probes, and electrical connections.
a. Allow an additional two inches (51 mm) below
the RM/EC7890 for flame amplifier mounting.
b. Allow an optional three-inch (76 mm) minimum
to both sides of the RM/EC7890 for electrical
signal voltage probes.
3. Make sure no subbase wiring is projecting beyond
the terminal blocks. Tuck in wiring against the back
of the subbase so it does not interfere with the knife
blade terminals or bifurcated contacts.
IMPORTANT
Install the RM/EC7890 with a plug-in motion
rather than a hinge action.
4. Mount the RM/EC7890 by aligning the four L-
shaped corner guides and knife blade terminals with
the bifurcated contacts on the wiring subbase and
securely tightening the two screws without
deforming the plastic.
Mounting Other System
Components (Fig. 3)
Refer to the applicable specifications for mounting other
system components.
Fig. 3. RM/EC7890 Relay Module exploded view.
HONEYWELL
POWER
PIL
OT
MAIN
F
L
AME
AL
A
R
M
RE
S
E
T
DUST
COVER
WIRING
Q7800B2003/U SUBBASE SHOWN
SUBBASE
CAPTIVE
MOUNTING
SCREW
RELAY
MODULE
SEQUENCE
STATUS
LED PANEL
RESET
BUTTON
FLAME
AMPLIFIER
B
URNE
R
CONTROL
CONFIGURATION
JUMPERS
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