Honeywell EXCEL 10 W7751H User Manual

Excel 10 W7751H Smart VAV Actuator

INSTALLATION INSTRUCTIONS

BEFORE INSTALLATION

The W7751H Smart VAV Actuator is a factory-combined
Excel 10 Variable Air Volume (VAV) Box Controller and an
ML6174 Direct-Coupled Actuator with De-clutch mechanism.
The actuator/controller assembly is field mounted to the VAV
box damper shaft similar to the mounting of a standard
actuator, and the controller wiring is terminated to the screw
terminals that are located under a snap-on cover. See Fig. 1.
The Smart VAV Actuator is a Free Topology Transceiver (FTT)
L

ONMARK® compliant controller. The W7751H2025 is for

smoke control use.

The ML6174 Direct-Coupled Actuator with De-clutch
mechanism (see Fig. 2 for location) allows the installer to
manually open or close the VAV box damper connected to the
W7751H without power or software tool to command it.

The controller in the W7751H contains a Microbridge flow­through pressure sensor and communicates via the
78 kilobaud Echelon® L

Triac output loads must draw a minimum current of 25 mA at
24 Vac, 60 Hz nominal. Triac maximum current rating: 77 mA.

The actuator on the W7751H mounts directly onto the VAV
box damper shaft and has up to 70 lb-in. torque (8 Nm), 90
degree stroke, and 90 second timing at 60 Hz.

The actuator on the W7751H can accommodate the optional
field-installed auxiliary switches.

NOTE: Mounting thermostat/sensor greater than 20 ft from

the W7751H2025 requires 14506944-001 Transient
Protectors. They must be installed on the thermostat/
sensor leads from the T7770C pins 3, 4, 5, 6, and 7.

ONWORKS® Bus Network.

INSTALLATION

Horizontally mount the W7751H on the damper shaft and
allow clearance for wiring, servicing and module removal.
Avoid mounting the W7751H in areas where acid fumes or
other deteriorating vapors can attack the metal parts of the
actuator, or in areas where escaping gas or other explosive
vapors are present. See Fig. 2 for mounting dimensions.

60

CW

45

CCW

CW

45

CCW

60

M19924

Fig. 1. Excel 10 Smart VAV Actuator.

IMPORTANT

The assembly is intended only for horizontal shaft
mounting, to assure proper heat dissipation from the
controller housing. The Smart VAV Actuator must not
be mounted with the controller at the top.

95-7553-04

EXCEL 10 W7751H SMART VAV ACTUATOR

MAINTAIN A
MINIMUM DISTANCE
OF 3 IN. (76 MM)
FROM OTHER
DEVICES OR PANELS
FOR REMOVING
CONTROLLER COVER

1-13/16 (46)

1-5/16 (33)

DE-CLUTCH
LEVER

3-3/4 (95)

MAINTAIN A MINIMUM DISTANCE
OF 4 IN (100 MM) FROM OTHER
DEVICES OR PANELS FOR
ATTACHING PNEUMATIC AIR
FLOW TUBING

60

4-1/16 (103)

CCW

CW

45

3-5/8 (92)

CW

CCW

45

1

(25)

60

1-13/16

(46)

5-7/8
(149)

Fig. 2. W7751H mounting dimensions in in. (mm).

The W7751H assembly is field mounted to the VAV box
damper shaft, the same as used for a typical actuator. The
actuator on the W7751H opens or closes a damper by driving
the damper shaft in either the counterclockwise (CCW) or
clockwise (CW) direction. The actuator has a mounting tab on
the bottom for securing to a VAV box damper. The mounting
tab is accessible through a hole in the controller with its cover
removed (see Fig. 3). The tab is sized for a 1/4 in. (6 mm)
screw or pin (not included).

The controller enclosure on the W7751H is constructed of a
sheet metal housing and a plastic snap-on cover. Controller
wiring on the W7751H is terminated to screw terminal blocks
located under the snap-on cover. See Wiring section. The
sheet metal housing has two 1/2 inch (13 mm) knockouts (see
Fig. 2) compatible with 1/2 inch (13 mm) or 3/4 inch (19 mm)
conduit.

NOTE: The assembly is intended only for mounting to a

horizontal shaft.

3-3/4

(95)

2-1/8

(54)

3/4

(19)

DE-CLUTCH
LEVER

1-15/16 (49)

3/4

(19)

M10523

The W7751H actuator is shipped in the fully clockwise (CW)
position (90 degree). The W7751H Assembly must be
mounted to a horizontal damper shaft to assure proper heat
dissipation from the controller housing. Mount the W7751H so
that the actuator is parallel with the VAV box damper housing.
In general, it is recommended that a washer or spacer be
added between the VAV box damper housing and the actuator
mounting tab to keep them parallel. See Fig. 4.

CAUTION

Equipment Damage Hazard.
Mounting actuator unevenly with damper housing
can damage actuator.

Mount actuator flush with damper housing or add
spacer between mounting tab and damper box
housing. (See Fig. 4.)

95-7553—04 2

EXCEL 10 W7751H SMART VAV ACTUATOR

A

A

CW

CCW

60

CW

45

PULL TOP OF
COVER OUT,
THEN DOWN,
FOR REMOVAL

CCW

45

60

CIRCUIT BOARD
TERMINAL BLOCKS

60

CW

45

CCW

CW

60

CCW

45

MOUNTING TAB

M10000

Fig. 3. Cover removal and mounting tab/terminal block access.

3. The direction the damper shaft rotates to open the

damper (CW or CCW), see Fig. 5.

1MM (1/32 IN.)

4. The damper opening angle (45, 60, or 90 degrees).

TYPE A DAMPER

IR

FLOW

CW TO OPEN, CCW TO CLOSE

TYPE B DAMPER

IR

FLOW

M2067B

1MM

Fig. 5. Determining rotation direction (CW or CCW)

(1/32 IN.)

M20884

Fig. 4. Mounting W7751H to VAV box damper housing

when actuator is not parallel to VAV box damper housing.

Before mounting the W7751H onto the VAV box damper shaft,
determine the following:

1. The damper shaft diameter, 3/8 to 1/2 in. (10 to 13 mm).

2. If the length of the VAV box damper shaft is less than

1-3/8 in. (35 mm), use the Short Shaft Adapter Kit (not

If damper shaft diameter is 3/8 inch (10 mm) round or square,
use part 201391 Shaft Adapter (shipped with the W7751H
Smart VAV Actuator). Ensure it is placed opposite set screws.
See Fig. 6. The adapter centers a 3/8 in. (10 mm) shaft in the
hub. Failure to use the adapter on a 3/8 in. (10 mm) shaft
causes the mounting tab to loosen. A 1/2 in. (13 mm) shaft
does not require the use of the adapter.

CCW TO OPEN, CW TO CLOSE

for damper opening.

included), part no. 4074EVK.

3 95-7553—04

EXCEL 10 W7751H SMART VAV ACTUATOR

SHAFT ADAPTER

M2064

Fig. 6. Use Damper Shaft Adapter for 3/8 in. (10 mm)

diameter round or square damper shafts.

The W7751H is shipped with the actuator rotated in the fully
clockwise (CW) position. The installation procedure varies
depending on the damper direction and angle:

1. If the damper rotates clockwise (CW) to open, and the
angle of the damper open to closed is 90 degrees,
manually open the damper fully to the clockwise
direction and mount the W7751H to the VAV damper
box and shaft. Tighten the Allen set screws. The part
no. 201614 Range Stop Pin, which is shipped with the
W7751H Smart VAV Actuator, is unnecessary. When
the W7751H closes, the damper rotates CCW 90
degrees to fully close.

2. If the damper rotates clockwise (CW) to open, and the
angle of the damper open to closed is 45 or 60 degrees,
manually open the damper fully to the clockwise
direction and mount the W7751H to the VAV damper
box and shaft. Tighten the Allen set screws. Insert the
part no. 201614 Range Stop Pin, which is shipped with
the W7751H Smart VAV Actuator, in either the 45 or
60 degree CCW slot, whichever applies (see Fig. 7).
The range stop pin must go all the way through the
housing. The pin can only be installed in the CCW slots
when the actuator is in the CW position. When the
W7751H closes, the damper rotates CCW either 45 or
60 degrees to fully close.

3. If the damper rotates counterclockwise (CCW) to open,
and the angle of the damper open to closed is
90 degrees, manually close the damper fully to the
clockwise direction and mount the W7751H to the
damper box and shaft. Tighten the Allen set screws.
The part no. 201614 Range Stop Pin, which is shipped
with the W7751H Smart VAV Actuator, is unnecessary.
When the W7751H opens, the damper rotates CCW 90
degrees to fully open.

NOTE: Be aware that the damper is closed. Until the

W7751H is powered and the damper is driven
open, starting the fan system with all the VAV
box dampers closed can cause duct over­pressurization and damage.

4. If the damper rotates counterclockwise (CCW) to open,
and the angle of the damper open to closed is 45 or
60 degrees, see the following NOTE.

NOTE: Special precautions must be taken for this

application. Mount the W7751H to the damper
box. (Do not tighten the Allen set screws yet).
Before the part no. 201614 Range Stop Pin,
which is shipped with the W7751H Smart VAV
Actuator, can be inserted in either the 45 or 60

degree CW slot, the damper actuator must be
driven fully open (CCW). To do this, the
controller on the W7751H must be wired,
powered, and connected to the portable PC via
the Serial LonTalk

®

Adapter (SLTA). The SLTA
connects to the controller on the W7751H via
the jack for Network Access on T7770 Wall
Module or by the B-Port on the Q7750A Zone
Manager. From E-Vision Software, drive the
actuator on the W7751H fully CCW, and insert
the range stop pin in either the 45 or 60 degree
CW slot, whichever applies (see Fig. 7). The
range stop pin must go all the way through the
housing. The pin can only be installed in the
CW slots when the actuator is in the CCW
position. (Disconnect the portable PC once
programming has been completed.) Manually
open the damper shaft fully (CCW) and then
tighten the Allen set screws. When the
W7751H closes, the damper will rotate CW 45
or 60 degrees to fully close.

CW

60

RANGE
STOP PIN

ACTUATOR
PLATES

CCW

CW

45

CCW

60

45

M10002

Fig. 7. Properly inserting range stop pin.

The Honeywell Software Tool’s (miscellaneous parameter for
rotation direction) defaults to CW to Open, which applies to
the damper direction and angle in items 1 and 2 above. The
parameter must be changed to CCW to Open if the damper
shaft rotates in this direction, which applies to the damper
direction and angle in items 3 and 4 above.

IMPORTANT

It is advisable to leave the dampers in an open
position after W7751H installation to avoid the
possibility of overpressurizing the ductwork on fan
startup. Use the De-clutch lever (see Fig. 2 for
De-clutch lever location) to open the box damper on
W7751H controllers that are powered down, to
prevent overpressurization in the ductwork on fan
startup. To use the De-clutch lever, press and hold
the lever in the direction of the arrow (this
disengages the motor). Turn the damper shaft until
the damper is open and release the lever. When
power is restored to the W7751H controller, the
controller synchronizes the damper actuator so that
the damper is in the correct position upon startup.

When a range stop pin is used with a field-added auxiliary
switch, the tab on top of the range stop pin must point inward
toward the VAV damper box shaft. See Fig. 11. This allows
clearance for the auxiliary switch housing. To remove the pin,
pry it up with a flathead screwdriver. See Fig. 8.

95-7553—04 4

EXCEL 10 W7751H SMART VAV ACTUATOR

IMPORTANT

The minimum position set screw on the actuator is
not available on the W7751H device.

SCREWDRIVER

M2065

Fig. 8. Lifting a range stop pin out of its slot.

Piping

Air flow Pickup

Connect the air flow pickup to the two connectors on the
controller of the W7751H. See Fig. 9.

CW

AIRFLOW
DP PICKUP

CCW

– LO

+ HI

60

CW

45

45

CCW

60

AIRFLOW
DIRECTION

— To prevent VAV air flow connector breakage, use

caution when removing tubing from it. Always pull
straight away from connector; never remove by
pulling at an angle.

Wiring

All wiring must comply with applicable electrical codes and
ordinances, or as specified on installation wiring diagrams.

NOTES:

— For multiple controllers operating from a single

transformer, the same side of the transformer
secondary must be connected to the same input
terminal in each controller and the ground
terminals (3 on the W7751H, 28 on the W7751B,
and 32 on the W7751D,F) must be connected to a
verified earth ground for each controller in the
group. See Fig. 10. (Controller configurations are
not necessarily limited to three devices, but the
total power draw including accessories cannot
exceed 100 VA when powered by the same
transformer. See System Engineering form
74-2949 for power wiring recommendations.)

— All loads on an Excel 10 Controller must be

powered by a single transformer.

— Keep the earth ground connection (terminal 3)

wire run as short as possible. Refer to Fig. 16.

—Do not connect the analog ground terminal (5) to

earth ground. Refer to Fig. 16.

Power

The 24 Vac power from an energy limited Class II Power
Source must be provided to each Smart VAV Actuator. To
conform to Class II restrictions, transformers must not be
larger than 100 VA. The maximum current draw at 24 Vac is

1.25A.

M10003

Fig. 9. Smart VAV Actuator air flow pickup connections.

NOTES:

— Use 1/4 in. (6 mm) outside diameter with 0.040 in.

(1 mm) wall thickness plenum rated 1219 FR
(94V-2) pneumatic tubing.

— Always use a fresh cut on the end of the tubing

that connects to the air flow pickups and the
connectors on the VAV controllers.

Connect the high pressure or upstream tube to the plastic
restrictor labeled (+ HI) or P1 and the low pressure or
downstream tube to the restrictor labeled (- LO) or P2. See
labeling in Fig. 9.

NOTES:

— If controllers are mounted in unusually dusty or

dirty environments, a 5-micron disposable air filter
is recommended for the high pressure line
(marked as +) connected to the air flow pickup.

— When using twin tubing from pickup, split pickup

tubing a short length to accommodate connections.

— Tubing from air flow pickup to VAV controller

should not exceed three feet (0.914m). Lengths
longer than this can degrade flow sensing
accuracy.

IMPORTANT

— Power must be off prior to connecting to or removing

connections from output terminals 9 and 10.

— Use the heaviest gauge wire available, up to

14 AWG (2.0 mm
(1.0 mm

2

), for all power and earth ground wiring. For

2

) with a minimum of 18 AWG

nonplenum, open areas, run cables exposed (or in
conduit, if required).

— If the W7751H Smart VAV Actuator is used on

Heating and Cooling Equipment (UL 1995, US
only) and the transformer primary power is more

than 150 volts, connect the transformer secondary to
earth ground, see Fig. 10.

NOTE: Maintain a three-inch (76 millimeter) separation

between Triac outputs and L

ONWORKS® Bus wiring

throughout installation.

Auxiliary Switches

The 201052A,B,C Auxiliary Switch can be used with the
W7751H. It allows for control of equipment external to the
actuator (for example, electric reheat coils or fan) at an
adjustable point in the stroke (from 0 to 90 degrees) of the
actuator. The 201052 Switch is field-added. Self-tapping
Phillips head screws are included with the switch. The switch
can be mounted only one way (see Fig. 11) with the switch
contacts pointed to the top of the actuator.

5 95-7553—04

EXCEL 10 W7751H SMART VAV ACTUATOR

W7751B

28

EARTH
GROUND

9

10

W7751D,F

32

EARTH
GROUND

PROCEDURE

1. Determine desired switching action (i.e, if switch
energizing is to occur during CW or CCW rotation). With
switch cam as shown in Fig. 12, the normally closed
contact opens in CCW rotation. The normally open
contact closes. Conversely, with switch cam as shown
in Fig. 13, the normally closed contact opens during CW
rotation and the normally open contact closes.

W7751H OR J

COM

NO
NC

CCW

24V

COM

24V

24
VAC

COM

EARTH
GROUND

24V

COM

123

EARTH
GROUND

1

1234

120/240

VAC

TRANSFORMER

1 IF THE W7751 CONTROLLER IS USED IN UL 1995 EQUIPMENT AND THE
PRIMARY POWER IS MORE THAN 150 VOLTS, GROUND ONE SIDE
OF TRANSFORMER SECONDARY.

Fig. 10. Power wiring for multiple controllers.

RANGE STOP PIN
POINTED TOWARD
SHAFT

90

75

60

45

30

15

0

201052 AUXILARY
SWITCH

N
C

COM

N
O

M2160

Fig. 12. Switching configuration for CCW rotation

(top view).

COM

NO
NC

CW

M10524A

M2161

Fig. 13. Switching configuration for CW rotation

(top view).

2. Align switch hub with actuator set screws. Mount switch

on actuator and tighten the three captive screws.

3. Connect controller with laptop PC. To do this, the
controller on the W7751H must be wired, powered, and
connected to the portable PC via the SLTA. The SLTA
connects to the controller on the W7751H via Network
Access Jack on the T7770 Wall Module or by B-Port on
the Q7750A Zone Manager. From E-Vision Software,
drive the W7751H actuator and halt the motion at the
desired position for switch operation.

M10005

Fig. 11. 201052 Auxiliary Switch mounted on W7751H.

NOTES:

— If a range stop pin is used, it must be pointing

inward toward the shaft (see Fig. 11) to allow
clearance for the auxiliary switch.

— Each switch is independently adjustable in two-

degree increments to any point within the travel of
the actuator. Switches have a fixed differential of
approximately three angular degrees.

95-7553—04 6

NOTE: When installed, angular position indicator on

the switch face moves from 90 to 0 degrees
during CCW motion and from 0 to 90 degrees
during CW motion.

4. Once finished programming, disconnect the portable
PC.

5. With a screwdriver, move the cam inside the switch
assembly to the appropriate position, remembering cam
travel direction for switching purposes (see Fig. 14)
when turning switch on or off. Monitor switch closure
with ohmmeter for a continuity check. Normally closed
contact should measure zero ohms and normally open
contact should measure infinite ohms when switch is not
activated. The opposite is true when switch is activated.

EXCEL 10 W7751H SMART VAV ACTUATOR

SWITCH CAMS

M2076A

Fig. 14. Auxiliary switch cam adjustment.

NOTE: For 2 or 3 switch models, cams align with their

respective switches and are individually set
using the same procedure described above.

6. Ensure switch activation at the desired degree of stroke
by commanding the actuator to both fully open and fully
closed; see step 3.

NOTE: Switches can also be preset prior to actuator

installation if angular switch position is known.

Communications

Refer to LONWORKS® Bus Wiring Guidelines, form 74-8565,
for complete description of L
rules.f

If a longer L

ONWORKS® Bus network is required, a Q7740A

2-way or Q7740B 4-way Repeater can be added to extend
L

ONWORKS® Bus length, only if this is an Energy

Management (PAZX) Bus.

IMPORTANT

The Q7740A,B Repeaters cannot be used in
smoke control applications.

ONWORKS® Bus network topology

• Approved cable type is Level IV 22 AWG (0.34 mm

2

)
plenum or non-plenum rated unshielded, twisted pair, solid
conductor wire:
— For nonplenum areas, use CMP listed cable.
— In plenum areas, use CMP listed cable.

• Do not bundle output wires with sensor, digital input or
L

ONWORKS® Bus wires.

• Ensure that neither L

ONWORKS® Bus wire is grounded.

• In noisy (high EMI) environments, avoid wire runs parallel
to noisy power cables, motor control centers, or lines
containing lighting dimmer switches. Keep at least 3 in.
(76 mm) of separation between noisy lines and
L

ONWORKS® Bus cable.

• Do not use different wire types or gauges on the same
LONWORKS® Bus segment:
— Step changes in line impedance characteristics cause

unpredictable reflections on the L

ONWORKS® Bus.

Wiring Details

Wire to the terminal blocks as follows:

1. Strip 3/16 in. (5 mm) insulation from the conductor.

2. Insert the wire in the required terminal location and

tighten the screw to complete the termination.

NOTE: With the exception of 14 AWG (2.0 mm

inserting two or more wires into one terminal
location, twist wires together before inserting
them. See Fig. 15. Deviation from this rule can
result in improper electrical contact.

The controller on the W7751H has the terminal arrangement
shown in Fig. 16. Fig. 16 through 21 provide detailed wiring
diagrams for the W7751H. Refer to installation diagrams for
specific wiring.

NOTE: Ensure Configuration DIP Switch is set as shown in

Fig. 19. Switches 1 through 3 set ML7984B Valve
Actuator timing to match W7751H outputs (0.1 sec.
minimum with maximum time of 25.6 sec.). Switch 4
determines actuator action (Off = Direct Acting, On =
Reverse Acting).

2

), if

A Q7751A Router can only be added to an Energy
Management Bus to partition system into two segments
(effectively doubling L

ONWORKS® Bus length). Only one

router is allowed with each Excel 10 Zone Manager (or Excel
15 Building Manager), and each network segment can have a
maximum of one repeater.

Pull the cable to each device on the L

ONWORKS® Bus and

connect to communication terminals 11 and 12 (W7751H).

IMPORTANT

Screw type terminal blocks are designed to accept
no more than one 14 AWG (2.0 mm
Multiple 14 AWG (2.0 mm

2

) wires can be connected

2

) conductor.

with a wire nut. Include a pigtail with this wire group
and attach the pigtail to the individual terminal block.

Notes on LonWorks® Bus Communications Wiring:

• All field wiring must conform to local codes and ordinances
(or as specified on the installation drawings).

1.

1/2

(13)

STRIP 1/2 IN.
(13 MM) FROM
WIRES TO BE
ATTACHED AT
ONE TERMINAL.

2.

TWIST WIRES
TOGETHER
WITH PLIERS
(A MINIMUM OF
THREE TURNS).

CONTROLLER OR
WALL MODULE
E-BUS CONNECTOR
TERMINALS

3.

CUT TWISTED END OF WIRES TO
3/16 IN. (5 MM) BEFORE INSERTING
INTO TERMINAL AND TIGHTENING
SCREW. THEN PULL ON EACH WIRE
IN ALL TERMINALS TO CHECK FOR
GOOD MECHANICAL CONNECTION.

M11413

Fig. 15. Attaching two or more wires at terminal blocks.

7 95-7553—04

EXCEL 10 W7751H SMART VAV ACTUATOR

7 69 8 54321

LED

SET PT

GND

BYPASS

SENSOR

AIR FLOW
DP PICKUP

T7770C
WALL
MODULE

AIR FLOW
DIRECTION

LOW

MICROBRIDGE

HI

24 VAC

DP SENSOR

NOT EARTH GROUND

BYPASS

SENSOR

GND

SET PT

COM

24 VAC

EARTH

12345678 9101112

2

WALL MODULE

E-BUS

E-BUS

W7751H

TRIAC
EQUIVALENT
CIRCUIT

LED

OUT 1

COMM
OUT

2

JACK FOR
E-BUS
NETWORK
ACCESS

E-BUS

OUT 2

COMM
IN

COMM
OUT

2

7 69 8 54321

LED

SET PT

GND

BYPASS

SENSOR

E-BUS

E-BUS

JACK FOR

T7770C
WALL

AIR FLOW
DP PICKUP

LOW

MICROBRIDGE

HI

2

24 VAC

DP SENSOR

COM

24 VAC

12345678 9101112

2

MODULE

AIR FLOW
DIRECTION

NOT EARTH GROUND

SENSOR

GND

SET PT

EARTH

WALL MODULE

BYPASS

W7751H

LED

E-BUS
NETWORK
ACCESS

TRIAC
EQUIVALENT
CIRCUIT

E-BUS

OUT 2

OUT 1

2

COMM
IN

1
EARTH
GROUND

NOTE: LOAD POWER WIRE
IS CONNECTED
TO TERMINAL 1.

1

EARTH GROUND WIRE LENGTH SHOULD BE HELD TO A MINIMUM. USE
THE HEAVIEST GAUGE WIRE AVAILABLE, UP TO 14 AWG (2.0 MM
WITH A MINIMUM OF 18 AWG (1.0 MM

2

TO ASSURE PROPER ELECTRICAL CONTACT, WIRES MUST BE TWISTED
TOGETHER BEFORE INSERTING INTO THE TERMINAL BLOCK.

OPEN
SIGNAL

COM

STEM
UP

M6410 SERIES 60
VALVE ACTUATOR

TWO OR THREE-WAY VALVE

2

), FOR EARTH GROUND WIRE.

STEM
DOWN

CLOSED
SIGNAL

2

)

M10525

Fig. 16. W7751H modulating reheat valve wiring diagram.

(For Note 2 instructions, refer to Fig. 15.)

95-7553—04 8

1

EARTH
GROUND

NOTE: LOAD POWER WIRE
IS CONNECTED
TO TERMINAL 1.

LINE POWER

1

EARTH GROUND WIRE LENGTH SHOULD BE HELD TO A MINIMUM. USE
THE HEAVIEST GAUGE WIRE AVAILABLE, UP TO 14 AWG (2.0 MM
WITH A MINIMUM OF 18 AWG (1.0 MM

2

TO ASSURE PROPER ELECTRICAL CONTACT, WIRES MUST BE TWISTED
TOGETHER BEFORE INSERTING INTO THE TERMINAL BLOCK.

STAGE 1

2

), FOR EARTH GROUND WIRE.

STAGE 2

CONTACTORS
24 VAC ONLY

Fig. 17. W7751H 2-stage reheat wiring diagram.

(For Note 2 instructions, refer to Fig. 15.)

2

)

M10526

EXCEL 10 W7751H SMART VAV ACTUATOR

AIR FLOW
DP PICKUP

LOW

HI

T7770D
WALL
MODULE

AIR FLOW
DIRECTION

MICROBRIDGE
DP SENSOR

NOT EARTH GROUND

7 69 8 54321

LED

SET PT

GND

BYPASS

SENSOR

E-BUS

W7751H

2

E-BUS

JACK FOR
E-BUS
NETWORK
ACCESS

TRIAC
EQUIVALENT
CIRCUIT

COMM
OUT

CHECKOUT

W7751H Checkout

Step 1. Wiring Connections

Inspect all wiring connections at the W7751H and the T7770
terminals, and verify compliance with installation diagrams. If
any wiring changes are required, first be sure to remove
power from the controller before starting work. Pay particular
attention to:
— 24 Vac power connections. Verify multiple controllers being

powered by the same transformer are wired with the
transformer secondary connected to the same input
terminal numbers on each W7751. See Fig. 10. (Controller
configurations are not necessarily limited to three devices,
but the total power draw including accessories cannot
exceed 100 VA when powered by the same transformer.
See System Engineering form 74-2949 for power wiring
recommendations.)

— Controller wiring. Be sure that each controller is wired

(terminal 3 on the W7751H, 28 on the W7751B, and 32 on
the W7751D,F) to a verified earth ground using a wire run
as short as possible with the heaviest gauge wire available,
up to 14 AWG (2.0 mm
(1.0 mm

2

) for each controller in the group. See Fig. 10.

— Verify Triac wiring to external devices uses the proper load

power/24 Vac Hot terminal (terminal 1 on the W7751H).

2

) with a minimum of 18 AWG

BYPASS

SENSOR

GND

SET PT

COM

24 VAC

EARTH

12345678 9101112

2

24 VAC

1

EARTH

GROUND

WALL MODULE

2

LED

WIRED FOR MODULATING
OR STAGED REHEAT. SEE
FIG. 17 OR FIG. 18.

OUT 2

OUT 1

C7770A AIR
TEMPERATURE SENSOR

1

EARTH GROUND WIRE LENGTH SHOULD BE HELD TO A MINIMUM. USE
THE HEAVIEST GAUGE WIRE AVAILABLE, UP TO 14 AWG (2.0 MM
WITH A MINIMUM OF 18 AWG (1.0 MM

2

TO ASSURE PROPER ELECTRICAL CONTACT, WIRES MUST BE TWISTED
TOGETHER BEFORE INSERTING INTO THE TERMINAL BLOCK.

3

NOTE: AIR TEMPERATURE SENSOR CANNOT BE USED WITH EITHER THE
T7750B OR C WALL MODULE.

Fig. 18. W7751H discharge air sensing

(For Note 2 instructions, refer to Fig. 15.)

2

), FOR EARTH GROUND WIRE.

E-BUS

COMM
IN

2

)

2

M10527A

NOTE: All wiring must comply with applicable electrical

codes and ordinances. Refer to installation diagrams
for specific wiring.

Verify Termination Module Placement

The installation wiring diagrams should indicate the locations
for placement of Termination Module(s). Refer to the

LONWORKS® Bus Wiring Guidelines, form 74-2865, and the
Excel 10 FTT Termination Module Installation Instructions,
form 95-7554. Correct placement of the termination module(s)

is required for proper L

ONWORKS® Bus communications.

Step 2. Startup

Broadcasting the Service Message

The Service Message allows a device on the LONWORKS®
Bus to be positively identified. The Service Message contains
the controller neuron ID number and, therefore, can be used
to confirm the physical location of a particular Excel 10 in
building.

There are three methods of broadcasting the Service
Message from an Excel 10 W7751H Controller:

1. Physical service pin on controller:
a. Remove the plastic cover and the white button is

located next to the terminal strip.

b. Momentarily pressing this service pin broadcasts

the Service Message on the network.

2. Using the wall module bypass pushbutton:
a. By pressing the wall module bypass/override button

for more than four seconds, the controller sends the
Service Message.

b. This functionality is supported in firmware version

1.2.15 or higher.

9 95-7553—04

EXCEL 10 W7751H SMART VAV ACTUATOR

NOTE: During item 2, the occupancy override state of

the controller changes based on how long the
bypass/override button is depressed. For
example, if the button is pressed for 6 sec., the
node sends the Service Pin Message, AND the
node enters Continuous Unocc mode. To clear
Continuous Unocc mode, the button must be
pressed momentarily.

3. The following method is only supported on E-Vision and
L

ONSPEC™:

a. When an Assign ID command is issued from the

Honeywell Software listed, the node enters the
SERVICE_MESSAGE mode for five minutes.

b. In this mode, pressing the bypass/override button

causes the Service Message to be broadcast on the

network.
c. All other functions are normal in this mode.
d. If the bypass/override button is not available, short-

ing the controller Bypass Input terminals (on

W7751H short terminals 5 and 7) broadcasts the

Service Message.

Alarms

The commissioning tool is used to perform the ID Assignment
task. Once the ID Assignment and commissioning has been
done, check the controller status LED to determine if there are
any alarms.

W7751 Controller Status LED

The LED on the front of a W7751H Controller (located just
under the plastic cover), provides a visual indication of the
status of the device. When the W7751H receives power, the
LED appears in one of the following allowable states:

1. Off—no power to the processor.

2. Continuous on—processor is in initialized state.

3. Slow blink—controlling, normal state.

4. Fast blink—when the Excel 10 VAV Controller has an

alarm condition.
When an Excel 10 has an alarm condition, it reports it to the
central node on the L
Controller variables, AlarmLogX, where X is 1 through 5, that
store the last five alarms to occur in the controller, are
available. These points can be viewed through workstation
software. Refer to the VAV System Engineering Guide form,
74-2949 Table 12 for a description of the Excel 10 Alarms.

NOTE: The node can be reset by switching the node to

MANUAL and then to the normal operating mode.

ONWORKS® Bus. Also, the Excel 10 VAV

1

24 VAC

REHEAT VALVE

ACTUATOR

W7751H

NOT EARTH GROUND

BYPASS

SENSOR

GND

SET PT

COM

24 VAC

EARTH

12345678 9101112

1

MAKE SURE ALL TRANSFORMER/POWER WIRING IS AS SHOWN;
REVERSING TERMINATIONS WILL RESULT IN EQUIPMENT MALFUNCTION.

2

TO ASSURE PROPER ELECTRICAL CONTACT, WIRES MUST
BE TWISTED TOGETHER BEFORE INSERTING INTO THE TERMINAL BLOCK.

WALL MODULE

LED

TRIAC
EQUIVALENT
CIRCUIT

E-BUS

OUT 2

OUT 1

Fig. 19. W7751H to PWM Valve Actuator.

PWM VALVE ACTUATOR

PWM OUTPUT

24 (N)

24 (H)

T6 T5 C B W R

2

FROM CNTRL

PWM (H 24 VAC)

PWM VALVE ACTUATOR

24 (N)

24 (H)

T6 T5 C B W R

2

CONFIGURATION DIP SWITCHES

LOCATED ADJACENT TO THE INPUT

ML7984B

ML7984B

PWM OUTPUT

FROM CNTRL

PWM (H 24 VAC)

PERIPHERAL REHEAT

VALVE ACTUATOR

1234

ON

OFF

TERMINAL BLOCK ON ML7948B

M10528

95-7553—04 10

EXCEL 10 W7751H SMART VAV ACTUATOR

SERIES OR

W7751H

TRIAC

NOT EARTH GROUND

BYPASS

SENSOR

GND

SET PT

COM

24 VAC

EARTH

12345678 9101112

1

24 VAC

MAKE SURE ALL TRANSFORMER/POWER WIRING IS AS SHOWN; REVERSING TERMINATIONS WILL RESULT IN EQUIPMENT MALFUNCTION.

1

2

TO ASSURE PROPER ELECTRICAL CONTACT, WIRES MUST BE TWISTED TOGETHER BEFORE INSERTING INTO THE TERMINAL BLOCK.

WALL MODULE

LED

EQUIVALENT
CIRCUIT

E-BUS

OUT 2

OUT 1

CONTACTOR

(24 VAC)

PARALLEL

FAN

PWM VALVE ACTUATOR

24 (N)

?24 (H)

T6 T5 C B W R

2

Fig. 20. W7751H to PWM Valve Actuator and series or parallel fan.

ML7984B

PWM OUTPUT

FROM CNTRL

PWM (H 24 VAC)

REHEAT

VALV E

ACTUATOR

M10529

W7751H

NOT EARTH GROUND

BYPASS

SENSOR

GND

SET PT

COM

24 VAC

EARTH

12345678 9101112

24 VAC

1

REVERSE WIRES (INCREASE/DECREASE) TO REVERSE ACTION (DIRECT/REVERSE).

2

MAKE SURE ALL TRANSFORMER/POWER WIRING IS AS SHOWN; REVERSING TERMINATIONS WILL RESULT IN EQUIPMENT MALFUNCTION.

3

OPTIONAL 24 VAC WIRING TO NEXT CONTROLLER.

4

USE 1/4 IN. (6 MM) MINIMUM PNEUMATIC TUBING. BRANCH LINE MUST BE 6 FT (1.8M) OR LONGER.

WALL MODULE

LED

TRIAC
EQUIVALENT
CIRCUIT

E-BUS

OUT 2

OUT 1

MMC325 PNEUMATIC
TRANSDUCER

24 (N)

24 (N)

2

?24 (H)

24 (H)

INCREASE

3

Fig. 21. W7751H to pneumatic transducer.

M

B

DECREASE

1

PNEUMATIC
VALV E

M

4

M10530

11 95-7553—04

EXCEL 10 W7751H SMART VAV ACTUATOR

T7770C or D Wall Module Override LED

The remote override LED, located on either the T7770C or
T7770D Wall Module will display the Manual Override mode of
the controller. The modes are:

1. LED = Off. No override active.

2. LED = Continuously On. Bypass mode (timed Occupied

override).

3. LED = One flash per second. Continuous Unoccupied
override.

4. LED = Two flashes per second. Remote only,
continuous Occupied override.

Step 3. I/O Tests

The controller can be configured using the LONSPEC™, or
E-Vision PC configuration tool. Once this is done, the
W7751H can be commanded to MANUAL mode, and each
output and input can be exercised/viewed to verify proper
wiring connections and equipment operation.

W7751H Actuator Checkout

To check out the actuator on the W7751H, determine the
direction the damper shaft moves to open the damper (CW or
CCW). See Fig. 5.

NOTE: Devices for use only if used for Energy Management:

Q7740A,B and Q7751A.

Devices for use on an Energy Management and/or Smoke
Control:
— 14507287 Series Power Supplies,
— W7751B2010, W7751D2016, W7751F2011,

— W7751H2025 Series 9,
— W7761A2010,
— Q7750,
— Q9200,
— XFL521, XFL522, XFL523, XFL524,
— XL500,
—XLINK.

Connect the controller with the laptop PC. To do this, the
controller on the W7751H must be wired, powered, and
connected to the portable PC via the SLTA. The SLTA
connects to the controller on the W7751H via the Jack for
Network Access on T7770 Wall Modules or by the B-Port on
the Q7750A Zone Manager. From L
Software, drive the actuator on the W7751H open and then
closed. Observe the operation of the actuator; if the damper is
closed, it should begin to open. If the damper is open, it
should begin to close.

NOTE: Once finished programming, disconnect the portable

PC.

If no movement is observed, check to see if 24 Vac is present
at the controller on the W7751H. With proper wiring, 24 Vac
present, and proper commands from the software, the
actuator should operate properly. If not, the W7751H Smart
VAV Actuator may need to be replaced.

ONSPEC™, or E-Vision

Step 4. Verify Sequences of Operation

For the detailed descriptions of the sequences of operation,
see the Excel 10 VAV System Engineering form 74-2949.

LONWORKS® and LONTALK® are registered trademarks of Echelon® Corporation.

LONSPEC™ is a trademark of Echelon® Corporation.

Automation and Control Solutions

Honeywell International Inc. Honeywell Limited-Honeywell Limitée

1985 Douglas Drive North 35 Dynamic Drive

Golden Valley, MN 55422 Toronto, Ontario M1V 4Z9

customer.honeywell.com

® U.S. Registered Trademark
© 2008 Honeywell International Inc.
95-7553—04 M.S. Rev. 03-08