Callout
Description and references
13
TSTAT modular port: RJ-45 8-pin modular jack, see
14
Captive spacer and screw
15
Alignment marks
16
SA bus modular port: RJ-12 6-pin modular jack, see
17
LED status indicators, see
Mounting the controller
About this task:
Observe the following guidelines when you mount the
VAV controller:
Note:
When the air supply to the VAV box is below
10°C (50°F), ensure that condensation on the VAV
box, particularly on the damper shaft, does not enter
the VAV controller.
• Ensure that the mounting surface can support the
controller and any user-supplied enclosure and
electronics.
• Mount the controller on a hard, even surface whenever
possible.
• Use shims or washers to mount the controller securely
and evenly on the mounting surface.
• Mount the controller in an area that is free of corrosive
vapors and where the ambient conditions match the
conditions specified in the
section.
• Provide at least 50 mm (2 in.) on the top, bottom,
sides, and front of the controller for cable and wire
connections and adequate ventilation through the
controller.
• Mount the controller vertically above the damper shaft
to allow any shaft condensation to fall away from the
controller.
• Do not mount the controller in areas where
electromagnetic emissions from other devices or wiring
can interfere with controller communication.
• Avoid mounting the controller on surfaces with
excessive vibration.
• When this installation replaces another controller,
plug the unused open hole in the duct work from the
original controller mounting. To plug the hole, use the
sheet metal screw from the original installation.
For panel mounting or enclosure mounting, observe these
additional guidelines:
• Do not install the controller in an airtight enclosure.
• Mount the controller so that the enclosure walls do
not obstruct cover removal or ventilation through the
controller.
• Mount the controller so that the power transformer
and other devices do not radiate excessive heat to the
controller.
To mount the controller, complete the following steps:
1. Set all the switches on the controller to their correct
values.
2. Place the controller in the correct mounting
position on the damper shaft so that the wiring
connections are easily accessible. Ensure that
the controller base is parallel to the VAV box and
perpendicular to the damper shaft. If needed, use a
spacer to offset tipping of the controller caused by
the shaft bushings.
Note:
Use the alignment marks to center the
captive spacer to ensure sufficient movement
in either direction.
3. Secure the self-drilling No. 10 screw through the
captive spacer with a power screwdriver and 100
mm (4 in.) extension socket. Alternatively, you can
use a punch to mark the position of the shoulder
washer, and then drill a hole into the VAV box with
a 3.5 mm (9/64 in.) drill bit. Insert the mounting
screw and tighten it against the spacer.
Important:
Do not overtighten the screw,
or the threads may strip. If you mount the
controller to the VAV box, ensure that the
screws do not interfere with damper blade
movement.
4. Locate the damper position. Use the typical
marking on the end of the damper shaft as shown
in the following figure.
Figure 3: Typical damper end shaft markings
5. Note the direction, clockwise (CW) or
counterclockwise (CCW), required to close the
damper. Grasp the damper shaft firmly with pliers,
and choose one of the following options:
- For 90° boxes, manually close the damper.
- For 45° or 60° boxes, manually open the
damper.
6. Push down and hold the
Manual Override
button
(see
coupler until it contacts the mechanical end-stop at
either the full-closed (90° boxes) or full-open (45°
and 60° boxes) position.
7. If the damper for a 90° box closes CCW, rotate
the coupler to the CCW mechanical limit. If the
damper for a 90° box closes CW, rotate the coupler
to the CW mechanical limit. The open end-stop is
automatically set for 90° boxes.
VAV1717 and VAV1732 VAV Controllers Installation Guide
5