Assembly - Honeywell 7800 SERIES Manual

MOUNTING RM7890
NOTE: For installation dimensions, see Figs. 1 or 2.
RELAY MODULE MOUNTING
1. Mount the RM7890 vertically, see Figs. 8 or 9, or
mount horizontally with the knife blade terminals pointing
downward. When mounted on the Q7800A, the RM7890
must be in an electrical enclosure.
2. Select the location in the electrical enclosure. Be sure
to allow adequate clearance for servicing, installation and
removal of the RM7890, Dust Cover, flame amplifier, flame
amplifier signal voltage probes, electrical signal voltage
probes and electrical connections.
a. Allow an additional two inches below the RM7890 for
the flame amplifier mounting.
b. Allow an optional three-inch minimum to both sides of
the RM7890 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: The 7890 must be installed with a plug-in
motion rather than a hinge action.
4. Mount the RM7890 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.
Fig. 8—Electrical panel installation.
MOUNTING DUST COVER
1. Align the two interlocking ears of the Dust Cover with
the two mating slots on the RM7890, see Fig. 10.
Fig. 9—Wall or burner installation.
Fig. 10—Dust Cover mounting.
2. Insert the two interlocking ears into the two mating
slots, and with a hinge action, push on the upper corners of the
Dust Cover to secure it to the RM7890.
3. Be sure the Dust Cover is firmly in place.
INSTALLING PLUG-IN FLAME SIGNAL
AMPLIFIER
1. Disconnect the power supply before beginning instal-
lation to prevent electrical shock and equipment damage.
More than one disconnect may be involved.
2. Align the amplifier circuit board edge connector with
the keyed receptacle on the RM7890. Verify that the ampli-
fier nameplate faces away from the Relay Module, see
Fig. 11.
3. Push in the amplifier until the circuit board is fully
inserted into the receptacle and then push the amplifier
toward the RM7890 retaining clasp.
4. Verify the amplifier is firmly in place.
5. Perform all required checkout tests.
13
RM7890A,B,C

ASSEMBLY

Assembly
65-0126—2