a spacer to offset tipping of the VMA controller
caused by the shaft bushings.
Note:
Use the alignment marks to center the captive
spacer to ensure sufficient VMA movement
in either direction.
3.
Secure the self-drilling No.10 screw through the
captive spacer (
) 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 1: 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
(
) and turn the VMA 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 VMA controller at the full-open
position, the VMA controller provides the open stop
for 45° and 60° boxes. The closed damper seal
provides the full-closed stop.
8.
All models are compact in size and are easily
installed on VAV boxes. The VMA1615/1630 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.
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.
10. Complete the mounting by rotating the damper to
the full-open position.
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.
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 démarrage de l'unité de traitement d'air.
3
VMA1615 and VMA1630 Variable Air Volume Controllers Installation Instructions