RM7895A RELAY MODULE
9
32-00122-01
a. Do not run high voltage ignition transformer
wires in the same conduit with the flame
detector, Data ControlBus™ Module, or Remote
Reset Module wiring.
b. Do not route flame detector, Data ControlBus™
Module, or Remote Reset Module leadwires in
conduit with line voltage circuits.
c. Enclose flame detector leadwires without armor
cable in metal cable or conduit.
d. Follow directions in flame detector, Data
ControlBus™ Module, or Remote Reset Module
Instructions.
7.
Keyboard Display Module (KDM): Because the KDM
is powered from a low voltage, energy limited,
source, it can be mounted outside of a control panel
if it is protected from mechanical damage.
NOTE:
A 13 Vdc power supply must be used any time
more than one KDM is used.
8.
Maximum wire lengths follow:
a. RM7895—The maximum length of leadwire is
300 feet to terminal inputs (Control, Preignition
Interlock, Running/Lockout Interlock, High Fire
Switch and Low Fire Switch).
b. Flame Detector leadwires—The maximum flame
sensor leadwire length is limited by the flame
signal strength.
c. Remote Reset leadwires—The maximum length
of wire is 1000 feet to a Remote Reset push but-
ton.
d. Data ControlBus™ Module—The maximum Data
ControlBus™ Module cable length depends on
the number of system modules connected, the
noise conditions and the cable used. The maxi-
mum length of all Data ControlBus™ Module
interconnecting wire is 4000 feet.
9.
Make sure loads do not exceed the terminal ratings.
Refer to the label on the RM7895 or to the ratings in
Table 1.
Final Wiring Check
1.
Check the power supply circuit. The voltage and
frequency tolerance must match those of the
RM7895. A separate power supply circuit may be
required for the RM7895. Add the required
disconnect means and overload protection.
2.
Check all wiring circuits and complete the Static
Checkout, see Table 7, before installing the RM7895
on the subbase.
3.
Install all electrical connectors.
4.
Restore power to the panel.
Table 4. Recommended Wire Sizes and Part Numbers.
Table 5. Recommended Grounding Practices.
Application
Recommended Wire Size
Recommended Part Number(s)
Line voltage terminals
14, 16 or 18 AWG copper conductor,
600 volt insulation, moisture-resistant
wire.
TTW60C, THW75C, THHN90C.
Keyboard Display Module (KDM)
22 AWG two-wire twisted pair with
ground, or five wire.
Belden 8723 shielded cable or
equivalent.
Data ControlBus™ Module
Remote Reset Module
22 AWG two-wire twisted pair,
insulated for low voltage.
—
Communications Interface
ControlBus™ Module
22 AWG two-wire twisted pair with
ground.
Belden 8723 shielded cable or
equivalent.
13 Vdc full-wave rectified transformer
power input
18 AWG wire insulated for voltages and
temperatures for given application.
TTW60C, THW75C, THHN90C.
Ground Type
Recommended Practice
Earth Ground (subbase and relay module).
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 fuse (or breaker) in the event of an inter-
nal short circuit.
2.
Use wide straps or brackets to provide minimum
length, maximum surface area ground conductors. If
a leadwire must be used, 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.
Signal ground (KDM, Data ControlBus™ Module,
Communications Interface ControlBus™ Module).
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 chain to earth ground.
