Honeywell R7120D Installation Instructions Manual page 3

Replacing Fireye D10 or E1XX
devices with R7120D
1. Locate the wire that is located on the D terminal that
goes to the High Fire (or Purge Rate) Switch.
2. Remove that wire and connect it to the M terminal.
Installing the R7120D Relay Module
1. Make sure no subbase wiring is projecting beyond the
terminal blocks. Route wiring against the back of the
subbase so it does not interfere with engagement of the
subbase terminals into the controller base.
2. Check the electrical tabs on the back of the chassis. If
they are bent out of position, reposition them with your
fingers so that they are in line.
3. Position the R7120 control into the mounting tabs of the
existing wiring base, and pivot the control into place. If a
shutter wire was installed for the Honeywell flame
detector, make sure the wire is not being pinched.
Refer to Fig. 8 for mounting information.
Ground Type
Earth ground (subbase and relay
module).
Signal ground (Keyboard Display
Module, Data ControlBus™ Module,
Modbus Module.
Table 1. Recommended Grounding Practices.
1. Use to provide a connection between the subbase and the control panel of the
equipment. Earth ground must be capable of conducting enough current to blow the
15A, type SC, fast blow fuse (or breaker) in the event of an internal short circuit.
2. Use wide straps or brackets to provide minimum length, maximum surface area
ground conductors. If a leadwire is required, use 14 AWG copper wire.
3. Make sure that mechanically tightened joints along the ground path are free of
nonconductive coatings and protected against corrosion on mating surfaces.
Use the shield of the signal wire to ground the device to the signal ground terminal 3(c) of
each device. Connect the shield at both ends of the daisy chain to earth ground.
3
R7120D BURNER CONTROL MODULES
4. Gently press the control onto the subbase to engage the
terminal blades and secure with the one captivated
mounting screw at the center top of the R7120D control
housing.
5. Tighten the mounting screws enough to seat the R7120
to the wiring base but DO NOT OVERTIGHTEN.
6. If installed in an electrical panel, be sure there is ade-
quate clearance behind the closed door of the panel so
there is no interference with the R7120.
Mounting Other System Components
Refer to Fig. 9 for exploded view of installation, or the
applicable specification sheet for mounting other system
components.
WARNING
Fire or Explosion Hazard.
Can cause severe injury, death or property
damage.
Follow applicable safety requirements when installing
a control on a burner to prevent death or severe injury.
Recommended Practice
66-1196EF—01