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Figure 19. Supply fan cone overlap
O/A Sensor and Tubing Installation
An Outside Air Pressure Sensor is shipped with all units
designed to operate on variable air volume applications or
units with modulating relief with Statitrac.
On VAV systems, a duct pressure transducer and the
outside air sensor is used to control the discharge duct
static pressure to within a customer-specified range. On
CV and VAV units equipped with modulating relief with
Statitrac, a space pressure transducer and the outside air
sensor is used to control the relief fan and dampers to
relieve static pressure to within a customer-specified range,
within the controlled space.
Use the following steps and image to install the sensor and
the pneumatic tubing.
1. Remove the O/A pressure sensor kit located inside the
main control box. The kit contains the following items:
a. O/A static pressure sensor with slotted mounting
bracket
b. 50 ft. tubing
c. Mounting hardware
2. Install the O/A static pressure sensor horizontally to the
roof rail at the return end of the unit.
3. Remove the dust cap from the tubing connector located
below the sensor in the vertical support.
4. Attach one end of the 3/16" O.D. factory-provided
pneumatic tubing to the sensor's top port. Attach the
other end of the tubing to the connector in the side of
the O/A intake hood (for units without O/A intake, attach
to panel at the return end of the unit).
RT-SVX063G-EN
Note: Use only what is required and discard excess
tubing.
Units with Statitrac
1. Open the control panel, and locate the Space Pressure
tubing connector.
2. Connect one end of the field provided 1/4" (length 50-
100 ft.) or 3/8" (length greater than 100 ft.) O.D.
pneumatic tubing for the space pressurization control to
the fitting.
3. Route the opposite end of the tubing to a suitable
location inside the building. This location should be the
largest open area that will not be affected by sudden
static pressure changes.
Figure 20. Pressure sensing tube location
Space Pressure
Tube Fitting
Installation
39
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