Note:
Use the alignment marks to center
the captive spacer to ensure sufficient CVM
movement in either direction.
3. Secure the self-drilling No.10 screw through
the captive spacer (see Figure 1) with a power
screwdriver and 100mm (4in.) extension socket.
Otherwise, use a punch to mark the position of
the shoulder washer, and then drill a hole into
the VAV box using a 3.5mm (9/64in.) drill bit.
Insert the mounting screw and tighten against
the spacer.
Important:
Do not overtighten the screw,
or the threads may strip. If mounting to
the VAV box, make sure the screws do not
interfere with damper blade movement.
4. Locate the damper position using the typical
marking on the end of the damper shaft as
shown in the figure below.
Figure 3: Typical damper end shaft icons
5. Note the direction, clockwise (CW) or
counterclockwise (CCW), required to close the
damper. Grasp the damper shaft firmly with
pliers, and either manually close the damper for
90° boxes or manually open the damper for 45°
or 60° boxes.
6. Push down and hold the
Manual Override
button (see Figure 1) and turn the CVM
controller 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.
For 45° and 60° boxes, you must provide hard
stops at both full-closed and full-open damper
positions. If you install the CVM controller at
the full-open position, the controller provides
the open stop for 45° and 60° boxes. The closed
damper seal provides the full-closed stop.
Note:
The integrated actuator has a
stroke time of 60 seconds for 90° of travel.
The stroke time is the amount of time
(in seconds) that it takes the actuator
to move from the fully closed to fully
opened position or from fully open to fully
closed position. For proper operation, the
actuator stroke time must be configured
in the CCT application based on the actual
time it takes the actuator to drive the
damper. The default setting is 60 seconds
(for 90° VAV boxes). For 45° and 60° VAV
boxes, the actuator stroke time must be
adjusted. Refer to
Controller Tool Help
(LIT-12011147)
for instructions on setting
the actuator stroke time in the application.
8. All models are compact in size and are easily
installed on VAV boxes. The models have either
a round shaft up to 13 mm in diameter or
a 10 mm square shaft. Tighten the square
coupler bolt to the shaft using an 8 mm (5/16
in.) wrench or 10 mm (3/8 in.) 12-point socket.
Tighten to 10.5 to 11.5 N·m (95 to 105 lb·in).
9. Loop the pneumatic tubing (supplied by field
personnel) to include a trap for condensation.
Attach the needed length of tubing (supplied
and installed by field personnel) to the dual
port fitting on the CVM controller and the other
ends of the tubing to the pressure transducer in
the VAV box application (see Figure 1).
Note:
The CVM uses a digital pressure
sensor with bidirectional flow operation,
which allows you to connect the high- and
low-pressure DP tubes to either barbed
fitting on the CVM controller. You do not
need to make a specific high- or low-side
connection when you attach the tubing to
the barbed fittings on the CVM.
M4-CVM03050 VAV Controllers Installation Guide
4