Honeywell EXCEL 10 W7751H User Manual

Page 4

EXCEL 10 W7751H SMART VAV ACTUATOR

95-7553—04

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

CCW

M10002

CCW

RANGE

STOP PIN

ACTUATOR

PLATES