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EXCEL 10 W7751H SMART VAV ACTUATOR
95-7553—04 2
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.
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.)
M10523
CCW
CCW
CW
CW
60
45
45
60
5-7/8
(149)
1-13/16
(46)
1
(25)
3-5/8 (92)
4-1/16 (103)
1-13/16 (46)
1-5/16 (33)
MAINTAIN A
MINIMUM DISTANCE
OF 3 IN. (76 MM)
FROM OTHER
DEVICES OR PANELS
FOR REMOVING
CONTROLLER COVER
3-3/4 (95)
MAINTAIN A MINIMUM DISTANCE
OF 4 IN (100 MM) FROM OTHER
DEVICES OR PANELS FOR
ATTACHING PNEUMATIC AIR
FLOW TUBING
2-1/8
(54)
DE-CLUTCH
LEVER
DE-CLUTCH
LEVER
3-3/4
(95)
1-15/16 (49)
3/4
(19)
3/4
(19)