Honeywell W7751H3007 INSTALLATION INSTRUCTIONS
Excel 10
W7751H3007 VAV ACTUATORS
HONEYWELL EXCEL 5000 OPEN SYSTEM
BEFORE INSTALLATION
The W7751H Smart VAV Actuator consists of a factorycombined variable air volume (VAV) box controller and a
direct-coupled damper 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 accessible inside the detachable wiring box. See
Fig. 2.
The W7751H's built-in actuator with de-clutch mechanism
allows the installer to manually open or close its built-in VAV
box damper without power or software tool.
The W7751H contains a Free Topology Transceiver (FTT)
LonMark® compliant controller containing a Microbridge flowthrough pressure sensor and communicates via the 78 kbaud
L
ONWORKS
The W7751H actuator mounts directly onto the VAV box
damper shaft and has up to 6 Nm torque, 95 degree stroke,
and 110 sec. timing at 50 Hz and 90 sec at 60 Hz.
If desired, the SSW2 Auxiliary Switch Kit (see "SSW2
Auxiliary Switch Kit for N05xx, N10xx Non-Spring Return
Direct-Coupled Damper Actuators – Installation Instructions",
Product Literature No.: MU1B-0284GE51) can be attached to
the W7751H. See also section "Optional Accessories" on
page 9.
NOTE: Any hardware driven by the triac outputs must have
® Network.
a min. current draw, when energized, of 25 mA at
24 Vac and a max. current draw of 770 mA.
INSTALLATION INSTRUCTIONS
Fig. 1. Excel 10 Smart VAV Actuator
1
2
MAIN FEATURES
Legend for Fig. 2:
1) Universal shaft adapter
2) Mechanical end limits (manually adjustable in increments
of 5.5°)
3) Air flow pick-up connector (-LO)
4) Air flow pick-up connector (-HI)
5) L
ONWORKS
6) Declutch button
7) L
ONWORKS
8) Detachable wiring box
9) Anti-rotation bracket
® U.S. Registered Trademark EN1B-0279GE51 R0707B
Copyright © 2007 Honeywell Inc. • All rights reserved
service LED
service pin
3
4
6
5
7
9
Fig. 2. W7751H main features
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EXCEL 10 W7751H SMART VAV ACTUATOR
INSTALLATION
The W7751H provides IP40 in all mounting orientations.
IP40 IP40
360° 360°
2
1
1
1
0
1
9
8
7
6
5
4
3
2
1
Fig. 4. Opening wiring box (1)
Fig. 3. Permissible orientations providing IP40
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 corrosive vapors
can attack the actuator's metal parts, or in areas where
escaping gas or other explosive vapors are present. See Fig.
23 for mounting dimensions.
The W7751H is field-mounted to the VAV box damper shaft.
The W7751H actuator opens or closes a damper by driving
the damper shaft in either the counterclockwise (CCW) or
clockwise (CW) direction. If the W7751H is to be mounted
directly onto a damper shaft, use the mounting bracket and
screw included in the delivery.
The wiring of the W7751H controller is terminated to a screw
terminal block accessible inside the detachable wiring box.
See section "Wiring".
The W7751H actuator is shipped in the fully counterclockwise
(CCW) position (95 degrees). Mount the W7751H so that the
actuator is parallel with the VAV box damper housing.
CAUTION
Equipment damage hazard.
Mounting actuator unevenly with damper housing
can damage actuator.
Mount the actuator flush with the damper housing or
add a spacer between the anti-rotation bracket and
the VAV damper box housing (see Fig. 6).
4
3
2
1
2
1
1
1
0
1
9
8
7
6
5
Fig. 5. Opening wiring box (2)
VAV b ox
damper shaft
VAV b ox
damper housing
spacer or washer
Fig. 6. Mounting W7751H with washer/spacer
Before mounting the W7751H onto the VAV box damper
shaft, do the following:
1. Ensure that the diameter of the damper shaft is within the
allowed limits (round: 8…16 mm, square: 6…13 mm).
EN1B-0279GE51 R0707B
2
2. Ensure that the damper shaft has a length of at least
40 mm.
3. Determine the direction (CW or CCW) in which the
damper shaft rotates to open the damper (see Fig. 7).
4. Determine the angle of the damper opening (can be
adjusted in increments of 5.5°).
TYPE A DAMPER
COOLING
AIR FLOW
CW TO OPEN, CCW TO CLOSE
TYPE B DAMPER
COOLING
AIR FLOW
CCW TO OPEN, CW TO CLOSE
Fig. 7. Determining direction of rotation
The W7751H actuator is shipped in the fully counterclockwise
(CCW) position (95 degrees). The installation procedure
varies depending on the damper direction.
NOTE: Be aware that, 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
over-pressurization and damage.
If Damper Rotates CW to Open
If the damper rotates clockwise (CW) to open, mount the
W7751H as follows:
1. Manually open the damper.
2. Push down the declutch button of the W7751H, and while
holding it down, manually rotate its shaft adapter fully to
the clockwise position.
3. Mount the W7751H to the VAV damper box and shaft.
4. Set the mechanical end limits of the W7751H (see Fig. 8).
When the W7751H closes, the damper will thus rotate
CCW until the mechanical end limits are reached.
If Damper Rotates CCW to Open
If the damper rotates counterclockwise (CCW) to open, mount
the W7751H as follows:
1. Manually open the damper.
2. Push the declutch button of the W7751H, and while
holding it down, manually rotate its shaft adapter fully to
the counterclockwise position.
3. Mount the W7751H to the VAV damper box and shaft.
4. Set the mechanical end limits of the W7751H (see Fig. 8).
When the W7751H closes, the damper will thus rotate CW
until the mechanical end limits are reached.
EXCEL 10 W7751H SMART VAV ACTUATOR
Fig. 8. Setting the mechanical end limits
Reconfiguring to Match Rotation Direction
Using the LNS plug-in, the W7751H can be reconfigured to
match the direction the damper shaft rotates to open the
damper. Reconfigure the damper's direction of rotation to
"open" or "closed," according to your needs.
To change the damper direction from CW to CCW using the
LNS plug-in, proceed as follows.
1. Open the configuration part of the plug-in and select the
"Wiring" tab (see Fig. 9).
Fig. 9. Wiring tab (default configuration)
2. Then deselect the output configuration (see Fig. 10).
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EN1B-0279GE51 R0707B
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