(for 90° VAV boxes). For 45° and 60° VAV
boxes, the actuator stroke time must be
adjusted. Refer to the
Controller Tool Help
(LIT-12011147)
for instructions on setting
the actuator stroke time in the application.
7. 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).
8. Loop the pneumatic tubing to include a trap for
condensation. If needed, use the included brass
fittings and attach the included pieces of tubing
to the tubing of the VMA controller. Attach the
tubing from the VMA controller to the dual port
fitting on the VMA controller and the other ends
of the tubing to the pressure transducer in the
VAV box application (Figure 1). The VMA1826
does not come with the tubing pieces.
Note:
The VMA uses a digital non-flow
pressure sensor with bidirectional flow
operation, which allows the high- and
low-pressure DP tube connections to
be made to either barbed fitting on the
VMA 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 VMA.
9. Push the manual release 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.
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
Mise En Garde: 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.
Wiring
WARNING
Risk of Electric Shock
Disconnect the power supply before making electrical
connections to avoid electric shock.
AVERTISSEMENT
Mise En Garde: Risque de décharge électrique:
Débrancher l'alimentation avant de réaliser tout rac-
cordement électrique afin d'éviter tout risque de
décharge
Important:
Do not connect supply power
to the controller before finishing wiring and
checking all wiring connections. Short circuits
or improperly connected wires can result
in damage to the controller and void any
warranty.
Important:
Do not exceed the controller
electrical ratings. Exceeding controller electrical
ratings can result in permanent damage to the
controller and void any warranty.
Important:
Use copper conductors only. Make
all wiring in accordance with local, national, and
regional regulations.
Important:
Electrostatic discharge can
damage controller components. Use proper
electrostatic discharge precautions during
installation, setup, and servicing to avoid
damaging the controller.
VMA1826/1832 VAV Controller Installation Guide
5
