Wiring - Honeywell 7800 Series Manual

1. a. For proper subbase wiring, refer to Figs. 8, 9, 10 or
11.
b. For proper remote wiring of the Keyboard Dis-
play Module, refer to Figs. 12, 13 or 14 or to the
Specifications for the Keyboard Display Mod-
ule (65-0090), Communication Interface Base
Unit (63-2278), DATA CONTROLBUS MOD-
ULE™ (65-0091) or Extension Cable Assem-
bly (65-0131).
2. Disconnect the power supply from the main discon-
nect before beginning installation to prevent electrical
shock and equipment damage. More than one disconnect
may be involved.
3. All wiring must comply with all applicable electrical
codes, ordinances and regulations. Wiring, where required,
must comply with NEC, Class 1 (Line Voltage) wiring.
4. Recommended wire size and type:
a. All Line Voltage terminals use no. 14, 16, or 18
copper conductor (TTW60C or THW75C or
THHN90C) 600 volt insulation wire. For high
temperature installations, use wire selected for a
temperature rating above the maximum operat-
ing temperature. All leadwires should be mois-
ture resistant.
b. Keyboard Display Module—For communica-
tions purposes, use an unshielded 22 AWG 2-wire
twisted cable and one wire for ground if the
leadwire run and noise conditions permit; however,
some installations may need up to five wires, three
for communications and two for remote reset (in
either a single cable or separate cables for com-
munications or remote reset) or use Belden 8771
shielded cable or equivalent. The Key-
board Display Module, DATA CONTROLBUS
MODULE™ (for remote mounting or communi-
cations) or Communication Interface ControlBus
Module must be wired in a daisy chain configura-
tion, (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 modules on the
closest and farthest end of the daisy chain con-
figuration string require a 120 ohm (1/4 watt
minimum) resistor termination across terminals
1 and 2 of the electrical connectors, for connec-
tions over 100 feet, see Figs. 12, 13 and 14.
c. DATA CONTROLBUS MODULE™—For
communications purposes, use an unshielded
22 AWG 2-wire twisted cable if the leadwire run
and noise conditions permit; however, some instal-
lations may need up to five wires, three for commu-
nications and two for remote reset (in either a single
cable or separate cables) or use a Belden 8771
shielded cable or equivalent. The Keyboard Dis-
play Module, DATA CONTROLBUS MOD-
ULE™ (for remote mounting or communications)
or Communication Interface ControlBus Module
must be wired in a daisy chain configuration,
(1(a)-1(a), 2(b)-2(b), 3(c)-3(c)). The order of inter-
connection of all the devices listed above is not
important. Be aware that 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 electri-
cal connectors, for connections over 100 feet, see
Figs. 12, 13 and 14.
d. Remote Reset—Use no. 22 AWG or greater
twisted pair wire, insulated for low voltage, see
Figs. 12, 13 and 14.
e. Communication Interface ControlBus Module—
For communications purposes, use an unshielded
22 AWG 2-wire twisted cable if the leadwire run
and noise conditions permit or use a Belden 8771
shielded cable or equivalent. The Keyboard
Display Module, DATA CONTROLBUS MOD-
ULE™ (for remote mounting or communications)
or Communication Interface ControlBus Mod-
ule must be wired in a daisy chain configuration,
(1(a)-1(a), 2(b)-2(b), 3(c)-3(c)). The order of in-
terconnection of all the devices listed above is
not important. Be aware that modules on the
closest and farthest end of the daisy chain con-
figuration string require a 120 ohm (1/4 watt
minimum) resistor termination across terminals
1 and 2 of the electrical connectors, for connec-
tions over 100 feet, see Figs. 12, 13 and 14.
f. Use the recommended wire size for the 13 Vdc
full wave rectified transformer power input of
no. 18 AWG wire insulated for voltages and tem-
peratures encountered in the application. Sug-
gested wire types include TTW(60C), THW(75C)
and THHN(90C).
5. Recommended grounding practices:
a. The earth ground provides for a connection be-
tween the subbase and the control panel of the
equipment. The earth ground wire must be capable
of conducting the current to blow the 20A fuse (or
breaker) in event of an internal short circuit. The
RM7800 needs a low impedance ground connec-
tion to the equipment frame which, in turn, needs
a low impedance connection to earth ground. For
a ground path to be low impedance at RF fre-
quencies, the connection must be made with
minimum length conductors that have a maxi-
mum surface area. Wide straps or brackets are
13
RM7800E,G,L,M

WIRING

Wiring
65-0117—2