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
the 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, hard stops must
be provided at both full-closed and full-open
damper positions. By installing the 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 can be
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. (
Skip this step if you are installing the
VMA1626 model
) 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
controller and the other ends of the tubing
to the pressure transducer in the VAV box
application.
Note:
The controller uses a digital non-
flow pressure sensor (all models except
the VMA1626) with bidirectional flow
operation. You can connect the high-
and low-pressure DP tubes to either
barbed fitting on the 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 controller.
10. Push the Manual Override button, and turn the
actuator coupling manually to ensure that the
actuator can rotate from full-closed to full-open
positions without binding.
11. Complete the mounting by rotating the damper
to the full-open position.
CAUTION
Risk of Property Damage
Rotate the damper to the full-open position before
starting the air handler. Failure to rotate the damper to
the full-open position may result in damage to the VAV
box or ductwork when the air handler is started.
ATTENTION
Risque de dégâts matériels
Faire pivoter le registre pour le placer en position
d'ouverture complète avant de démarrer l'unité de
traitement d'air. Le non-respect de cette directive
risque d'endommager le caisson de l'unité à volume
d'air variable (VAV) ou le réseau de conduites au dé-
marrage de l'unité de traitement d'air.
VMA1615/1626/1628/1630 VAV Controllers Installation Guide
5
