Honeywell 7800 Series Installation Instructions Manual page 11

Application
Line voltage terminals
KDM
Data ControlBus™ Module
Remote Reset Module
Modbus™ Module
13 Vdc full-wave rectified
transformer power input.
The KDM, and (for remote mounting or communications) Data
ControlBus™ Module or Modbus™ Module must be wired in a
daisy chain configuration,
(1(a)-1(a), 2(b)-2(b), 3(c)-3(c)). The order of interconnection
of all the devices listed above is not important. Be aware that
Fig. 6. Wiring the RM7890 Relay Module.
Table 7. Recommended Wire Sizes and Part Numbers.
Recommended Wire Size
14, 16 or 18 AWG copper conductor,
600 volt insulation, moisture-resistant
wiring.
22 AWG two-wire twisted pair with
ground, or five-wire communications
wire.
22 AWG two-wire twisted pair with
ground or five-wire communications
wire.
22 AWG two-wire twisted pair,
insulated for low voltage.
22 AWG two-wire twisted pair with
ground.
18 AWG wire insulated for voltages and
temperatures for given application.
Recommended Part Numbers
TTW60C, THW75C, THHN90C.
®
Belden 8723 shielded cable (two-wire) or
®
Belden 8771 shielded cable (five-wire) or equivalent.
®
Belden 8723 shielded cable (two-wire) or
®
Belden 8771 shielded cable (five-wire) or equivalent.
—
®
Belden 8723 shielded cable or equivalent.
TTW60C, THW75C, THHN90C.
modules on the closest and farthest end of the daisy chain
configuration string require a 120 ohm (1/4 watt minimum)
resistor termination across terminals 1 and 2 of the electrical
connectors for connections longer than 100 feet (30 meters).
11
RM7890, RM7895 100 Vac
32-00216-01