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EXCEL 10 W7751H SMART VAV ACTUATOR
95-7553—04 4
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 over-
pressurization 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.
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.
SHAFT ADAPTER
M2064
CW
CCW
M10002
CCW
CW
45
45
60
60
RANGE
STOP PIN
ACTUATOR
PLATES