Honeywell 7800 Series Manual page 16

RM7895A,B,C,D
ASSEMBLY
5. Reinstall the Dust Cover, Keyboard Display Module,
DATA CONTROLBUS MODULE™ or Extension Cable
Assembly onto the RM7895 and restore power to the device.
Run the burner system through at least one complete cycle
to verify the system is operating as desired.
MOUNTING DUST COVER
1. Align the two interlocking ears of the Dust Cover with
the two mating slots on the RM7895, see Fig. 12.
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 RM7895.
3. Be sure the Dust Cover is firmly in place.
Fig. 12—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 RM7895. Ensure the amplifier
nameplate faces away from the Relay Module, see Fig. 13.
3. Push in the amplifier until the circuit board is fully
inserted into the receptacle and then push the amplifier
toward the RM7895 retaining clasp.
4. Verify the amplifier is firmly in place.
5. Perform all required checkout tests.
Fig. 13—Flame signal amplifier mounting.
INSTALLING THE FLAME DETECTOR
NOTE: Table 2 and Fig. 14 list the flame detection systems
available for use with the RM7895. 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 in-
creases with leadwire length, reducing the signal strength.
The maximum 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.
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