Honeywell EXCEL 10 W7753A User Manual

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Excel 10
W7753A Unit Ventilator Controller

INSTALLATION INSTRUCTIONS

PRODUCT DESCRIPTION

The W7753A Unit Ventilator Controller is a Free Topology
Transceiver (FTT) L
in the Excel 10 family product line.

This controller can be used to monitor/control HVAC
equipment, lighting, and other miscellaneous loads in a
distributed network. The controller is field-mounted to the
equipment that it controls, and the controller wiring is attached
to the screw terminals located on the controller (see Fig. 1).

ONMARK® Compliant Unit Vent controller

31

30 29 28

DI-4 GND

DI-3

DI-2 GND DI-1

27

26 25

24

23 22

21

VAC

24

24

1

VAC

COM

OUT

OUT

20

2

3

4

OUT

OUT

The W7753A Controller communicates via the 78 kilobaud
Echelon® LonWorks® E-Bus Network.

Allowable input/output connections consist of wall module
points plus two additional resistive sensor inputs, two voltage/
current inputs, four digital inputs and eight digital Triac
outputs.

For the W7753A, any hardware driven by the Triac outputs
must have a minimum current draw, when energized, of
25 mA and a maximum current draw of 500 mA.

19 18

17

OUT

16

6

7

8

OUT

OUT

OUT

5

E

GND

1

LED

BYPASS

23

SNSR

GND

SET PT

AI-1

GND

A1-2

AI-3

5

OHM

67

89

4

OHM

GND

V/mA

10 11 12

AI-4

V/mA

22VDC

OUT

13 14

E-BUS

E-BUS

JACK

15

J3

Fig. 1. Excel 10 W7753A Unit Ventilator Controller.

M12688

95-7520—02

EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

INSTALLATION

Mount the W7753A in a position that allows clearance for
wiring, servicing and controller removal. Avoid mounting the
W7753A in areas where acid fumes or other deteriorating
vapors can attack the metal parts of the controller, or in areas
where escaping gas or other explosive vapors are present.
See Fig. 2 for mounting dimensions.

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

DI-4

GND

DI-3 DI-2

GND

DI-1

24

VAC

24
VAC
COM

The controller enclosure on the W7753A is constructed of a
sheet metal housing and a plastic factory snap-on cover. The
controller mounts using two screws inserted through the
plastic cover. Use the screws appropriate for the mounting
surface. The W7753A can be mounted in any orientation.
Ventilation openings were designed into the cover to allow
proper heat dissipation regardless of the mounting orientation.

The W7753A can also be mounted using DIN rail (obtain
locally). If using DIN rail also purchase from Augat Inc. part
number 2TK2D DIN rail (adapter) two each (See Fig. 3).

2-1/8

(54)

1

OUT

2

OUT

3

OUT

4

OUT

5

OUT

6

OUT

OUT

7

8

OUT

5-5/8
(143)

E

BYPASS

SNSR

GND

SET PT

AI-1

GND

AI-2

AI-3

GND

AI-4

22VDC

LED

GND

1 23 456 789101112131415J3

OHM

5-3/16 (132)

OHM

V/mA

6 (152)

V/mA

OUT

E-BUS

E-BUS

JACK

Fig. 2. W7753A mounting dimensions in in. (mm).

3-1/16

(77)

M12689

95-7520—02 2

EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

Power

The 24 Vac power from an energy-limited Class II Power
Source must be provided to each W7753A Controller. To
conform to Class II restrictions (U.S. only), transformers must
not be larger than 100 VA.

2

A transformer that meets CE mark requirements and that
meets the Low Voltage Directive (LVD) requirements must be
used in Europe for all installations of this product. More than

3

one W7753A Controller can be powered by a single
transformer. Fig. 4 shows power wiring details for a single
controller and Fig. 5 depicts multiple controllers using one
transformer.

1

M6857

Fig. 3. W7753A DIN rail mounting.

Wiring

All wiring must comply with applicable electrical codes and
ordinances or as specified on installation wiring diagrams.
Controller wiring on the W7753A is terminated to the screw
terminal blocks located on the top and the bottom of the
controller.

NOTES:

— For multiple controllers operating from a single

transformer, the same side of the transformer
secondary must be connected to the same power
input terminal in each controller. The ground
terminal (1 on the W7753A) must be connected to
a verified earth ground for each controller in the
group (see Fig. 5). (Controller configurations are
not necessarily limited to three controllers, but the
total power draw including accessories cannot
exceed 100 VA when powered by the same
transformer (U.S. only). See System Engineering
form 74-2964 for power wiring recommendations.)

— All loads on an Excel 10 W7753A Controller must

be powered by the same transformer that powers
the Excel 10 W7753A Controller. A W7753A
Controller can use separate transformers for
controller power and load power.

— Keep the earth ground connection (terminal 1)

wire run as short as possible. Refer to Fig. 9
through 14.

—Do not connect the analog or digital ground

terminals (5, 8, 11, 27 and 30) to earth ground.
Refer to Fig. 9 through 14.

IMPORTANT

Use the heaviest gauge wire available, up to 14
AWG (2.0 mm
(1.0 mm

2

) with a minimum of 18 AWG

2

), for all power and earth ground wiring.
Screw type terminal blocks are designed to accept
up to two 14 AWG (2.0 mm2) conductors, one on
each side of the terminal screw. More than two wires
that are 14 AWG (2.0 mm2) can be connected with a
wire nut. Include a pigtail with this wire group and
attach the pigtail to one side of the terminal block.

OUTPUT
DEVICE
POWER

TRANSFORMER

CONNECT POWER TO
TERMINALS 24 AND 25

W7753A

1

EARTH
GROUND

TRIAC LINES
TO ACTUATORS
AND
CONTACTORS

25

24

2022

M12681

Fig. 4. Power wiring details; one Excel 10 per transformer.

NOTES:

— Unswitched 24 Vac power wiring can be run in the

same conduit as the E-Bus cable.

— Maintain at least three-inch (76 mm) separation

between Triac outputs and E-Bus wiring
throughout the installation.

See the following IMPORTANT on Heating and Cooling
Equipment (UL 1995, U.S. only).

IMPORTANT

If the W7753A Controller is used on Heating and
Cooling Equipment (UL 1995, U.S. only) and the
transformer primary power is more than 150 volts,
connect the transformer secondary to earth ground
(see Fig. 6). For these applications, only one
W7753A Excel 10 controller can be powered by each
transformer.

3 95-7520—02

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.

1

1

1

EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

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
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).

2

) plenum and non-plenum rated

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 unpre­dictable reflections on the E-Bus. When using dif­ferent 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 cen­ters, 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 topol­ogy, if controllers are on either end of an E-Bus wire
run, mount the termination module on the appropri­ate terminals as shown in Fig. 7.

95-7520—02 4