EC7890 RM7890 · Edition 12.23
EN-9
4.3 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 connec-
tions.
a. Allow an additional two inches (51mm) below the RM/
EC7890 for flame amplifier mounting.
b. Allow an optional three-inch (76mm) 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 Lshaped corner
guides and knife blade terminals with the bifurcated contacts
on the wiring subbase and securely tightening the two screws
without deforming the plastic.
4.4 Mounting Other System Components
Refer to the applicable specifications for mounting other system
components.
4.4.1 Fig. 3. RM/EC7890 Relay Module exploded view
HONEYWELL
POWER
FLAME
RESET
BURNER CONTROL
M17823B
ALARM
Q7800A1005
DUST
COVER
(PLASTIC PANEL MOUNT
SUB-BASE MODEL)
CAPTIVE
MOUNTING
SCREW
RELAY
MODULE
SEQUENCE
STATUS
LED PANEL
RESET
BUTTON
FLAME
AMPLIFIER
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