Honeywell 7800 Series Manual page 17

Fig. 13—Wall or burner installation.
MOUNTING DUST COVER
1. Align the two interlocking ears of the Dust Cover with
the two mating slots on the RM7885A, see Fig. 14.
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 RM7885A.
3. Be sure the Dust Cover is firmly in place.
Fig. 14—Dust Cover mounting.
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 RM7885A. Verify the amplifier
nameplate faces away from the Relay Module, see Fig. 15.
3. Push in the amplifier until the circuit board is fully
inserted into the receptacle and then push the amplifier
toward the RM7885A retaining clasp.
4. Verify the amplifier is firmly in place.
5. Perform all required checkout tests.
Fig. 15—Flame signal amplifier mounting.
INSTALLING THE FLAME DETECTOR
NOTE: Table 2 and Fig. 16 list the flame detection systems
available for use with the RM7885A. Make sure the
correct combination of amplifier and flame detector(s) is
used.
Proper flame detector installation is the basis of a safe and
reliable flame safeguard installation. Refer to the Instructions
packed with the flame detector and the equipment manufac-
turer instructions.
Keep the flame signal leadwires as short as possible from the
flame detector to the wiring subbase. Capacitance increases
with leadwire length, reducing the signal strength. The maxi-
mum permissible leadwire length depends on the type of
flame detector, leadwire and conduit. The ultimate limiting
factor in the flame detector leadwire is the flame signal, see
Table 5.
17
RM7885A
ASSEMBLY
65-0107