Communications – Honeywell EXCEL 10 W7753A User Manual

Page 4

EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

95-7520—02

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

) 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

) 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

W7753A

EARTH

GROUND

W7753A

EARTH

GROUND

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.