Honeywell EXCEL 10 W7753A - Manual (Page 4)

EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER
95-7520—02 4
Fig. 5. Power wiring details for two or more Excel 10s per transformer.
Fig. 6. Transformer power wiring details for one Excel 10
used in UL 1995 equipment (U.S. only).
Communications
Refer to E-Bus Wiring Guidelines, form 74-2865, for a
complete description of E-Bus network topology rules.
Approved cable types for E-Bus communications wiring are
Level IV 22 AWG (0.34 mm 2 ) plenum and non-plenum rated
unshielded, twisted pair, solid conductor wire. For nonplenum
areas, U.S. part AK3781 (one pair) or U.S. part AK3782 (two
pair) can be used. In plenum areas, U.S. part AK3791 (one
pair) or U.S. part AK3792 (two pair) can be used.
Communications wiring can be run in a conduit, if needed,
with non-switched 24 Vac or sensor wiring. If a longer E-Bus
network is required, a Q7740A 2-way or Q7740B 4-way
repeater can be added to extend the length of the E-Bus. Also
a Q7751A Router can be added to partition the system into
two segments and effectively double the length of the E-Bus.
Only one router is allowed with each Excel 10 Zone Manager,
and each network segment can have a maximum of one
repeater.
Pull the cable to each device on the E-Bus and connect to
communication terminals 14 and 15 (W7753A).
NOTES: (For Communications Wiring)
— All field wiring must conform to local codes and
ordinances (or as specified on the installation
drawings).
— Approved cable types for E-Bus communications
wiring is Level IV 22 AWG (0.34 mm 2 ) plenum
and non-plenum rated unshielded, twisted pair,
solid conductor wires. For nonplenum areas, U.S.
part AK3781 (one pair) or U.S. part AK3782 (two
pair) can be used. In plenum areas, U.S. part
AK3791 (one pair) or U.S. part AK3792 (two pair)
can be used.
— Unswitched 24 Vac power wiring can be run in the
same conduit as the E-Bus cable.
— Do not bundle output wires with sensor, digital
input or communications E-Bus wires.
— Do not use different wire types or gauges on the
same E-Bus segment. The step change in line
impedance characteristics would cause unpre-
dictable reflections on the E-Bus. When using dif-
ferent types is unavoidable, use a Q7751A Router
at the junction.
— In noisy (high EMI) environments, avoid wire runs
parallel to noisy power cables, motor control cen-
ters, or lines containing lighting dimmer switches,
and keep at least 3 in. (76 mm) of separation
between noisy lines and the E-Bus cable.
— Each daisy-chained E-Bus segment that is on one
side of a Q7751A,B Router (can contain up to 60
Excel 10s) and has a length greater than 1640 ft.
(500m) must have two E-Bus 209541B
Termination Modules, one at each end of the
daisy-chain wiring run.
— Make sure that neither of the E-Bus wires is
grounded.
NOTE: If a 209541B Termination Module is required at a the
UV controller, connect two of the three termination
module wires to the E-Bus terminals. Selecting the
appropriate two wires depends on the E-Bus network
topology. Refer to the E-Bus Wiring Guidelines, form
74-2865, and the Excel 10 FTT Termination Module
Installation Instructions, form 95-7554. For example,
using a doubly terminated daisy-chained bus topol-
ogy, if controllers are on either end of an E-Bus wire
run, mount the termination module on the appropri-
ate terminals as shown in Fig. 7.
M12682
24 VAC 120/240 VAC
TRANSFORMER W7753A
EARTH
GROUND
24 25
1
W7753A
EARTH
GROUND
24 25
1
W7753A
EARTH
GROUND
24 25
1
M12680
24 VAC
LINE VOLTAGE
GREATER
THAN 150 VAC
TRANSFORMER W7753A
EARTH
GROUND
EARTH
GROUND
IF THE W7750 CONTROLLER IS USED IN UL 1995 EQUIPMENT AND THE
PRIMARY POWER IS MORE THAN 150 VOLTS, GROUND ONE SIDE OF
TRANSFORMER SECONDARY.
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