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31-XXXX-XX
Prelim Draft - Brand Neutral
BACNET IP/MSTP VAV - INSTALLATION INSTRUCTION
NOTE:
NOTE:
IMPORTANT:
The pressure sensor is polarity insensitive. Pickup tubes
can be connected to either restrictor port irrespective of
marking on the sensor.
4.
If the damper rotates counterclockwise (CCW) to open, and
the angle of the damper open-to-closed is 45 or 60 degrees:
a.
Manually open the damper fully (rotate counter-
clockwise).
b.
The actuator is shipped with the mechanical end lim- its set at
95 degrees. Adjust the two mechanical end- limit set screws
to provide the desired amount of rotation. Adjust the two
set screws closer together to reduce the rotation travel.
c.
Tighten the two mechanical end-limit screws (Phil- lips #2
screwdriver; (26.5-31 lb.-in. [3.0-3.5 Nm] torque).
d.
Using the Declutch button, rotate the universal shaft adapter
fully counter-clockwise.
e.
Mount the actuator to the VAV damper box and shaft.
f.
Tighten the two bolts on the centering clamp (8 mm
wrench; 70 lb.-in. [8Nm] torque).
g.
When the actuator closes, the damper rotates CW either
45 or 60 degrees to fully close.
Differential Pressure Sensor
Connect the air flow pickup to the two restrictor ports on the
controller.
When twin tubing is used from the pickup, split the pickup
tubing a short length to accommodate the connections.
Figure 6. Airflow pickup connections
Best Practice for Zero Calibration of Air Flow Sensor
Connect the high pressure or upstream tube and the low
pressure or downstream tube to the restrictor port on the
controller.
NOTICE
Dust particle contamination may be present in some applications.
Ensure appropriate measures are taken to minimize the effect of
particulate contamination.
The sense element is in parallel to the airstream and tends to
direct the dust particles in the airflow stream past the sense
element away from the sense bridge. The sense element is a
microstructure-based device and the bridge portion of the sense
element structure is made up of two platinum sense elements
and a heater. The heater tends to repel dust particles via a
thermophoretic
NOTE:
Use 1/4 in. (6 mm) outside diameter, with a 3/64 in. (1
mm) wall thickness, plenum-rated 1219 FR (94V-2)
tubing.
Always use a fresh cut on the end of the tubing that
connects to the air flow pickups and the restrictor ports
on the controller.
NOTE:
The controller must be powered up for a minimum of 1
hour before performing the zero calibration for the air
flow sensor.
If controllers are mounted in unusually dusty or dirty
environments, an inline, 5-micron dispos- able air filter
(use 5-micron filters compatible with pneumatic controls)
is recommended for the high-pressure line connected to
the air flow pickup.
The tubing from the air flow pickup to the control- ler
should not exceed three feet (1 m). Any length greater
than this will degrade the flow sensing accuracy.
Use caution when removing tubing from a con- nector.
Always pull straight away from the connec- tor or use
diagonal cutters to cut the edge of the tubing attached to
the connector. Never remove by pulling at an angle.
Air, N2, O2
non-condensing
±500 Pa
(± 2” H2O)
0°C
50°C
(32°F)
(122°F)
ø5.2mm
ø3.5mm
8mm
