Installation - Trane IntelliPak RA 20 Installation, Operation And Maintenance Manual

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 constant volume 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
RT-SVX063E-EN
side of the O/A intake hood (for units without O/A
intake, attach to panel at the return end of the unit).
N N o o t t e e : : 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
I I n n s s t t a a l l l l a a t t i i o o n n
39