7800 SERIES EC7890A,B/RM7890A,B RELAY MODULE
65-0204–1
15
Installing Plug-In Flame Signal Amplifier
1
Disconnect the power supply before beginning
installation 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 7890. Verify that the
amplifier nameplate faces away from the Relay
Module, see Fig. 12.
3
Push in the amplifier until the circuit board is fully
inserted into the receptacle and then push the amplifier
toward the 7890 retaining clasp.
4
Verify the amplifier is firmly in place.
5
Perform all required checkout tests.
Installing The Flame Detector
NOTE:
Table 2 and Fig. 13 list the flame detection systems
available for use with the 7890. 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
manufacturer 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
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.
Fig. 12. Flame signal amplifier mounting.