Installation
RT-SVX35H-EN 33
Note: Fan assemblies not equipped with rubber or spring isolators have mounting bolts at the same locations and must not be removed.
O/A Sensor & 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 100% modulating exhaust w/
Statitrac.
On VAV systems, a duct pressure transducer (3U60) and
the outside air sensor is used to control the discharge duct
static pressure to within a customer-specified param
eter.
O
n CV & VAV units equipped with 100% modulating
exhaust w/Statitrac, a space pressure transducer (3U62)
and the outside air sensor is used to control the exhaust
fan and dampers to relieve static pressure, to within a
customer-specified parameter, within the controlled
space. Refer to Figure 15 and the following steps to install
the sensor and the pneumatic tubing.
1. Remove the O/A pressure se
nsor kit located inside the
fi
lter section. The kit contains the following items:
– an O/A static pressure sensor
– a sensor mounting bracket
– 2' of 3/16" O.D. pneumatic tubing
– mounting hardware
2. Using two #10-32 x 1-3/4" screws provided, install the
sensor's mounting bracket to the factory installed
bracket (near the filter section).
3. Using the #10-32 x 1/2" screws provided, install the O/
A static pressure sensor vertically to the sensor
b
racket.
4. Remove the dust cap from the tubing connector
located below the sensor in the vertical support.
5. Attach one end of the 2' x 3/16" O.D. factory provided
pneumatic tubing to the sensor's top port, and the
other end of the tubing to the connector in the vertical
support. Discard any excess tubing.
Units with Statitrac™
6. Open the filter access door, and locate the DSP control
devices (Refer to Figure 15). There are three tube
connectors mounted on the left of the solenoid and
transducers. Connect one end of the field provided 3/
16" O.D. pneumatic tubing for the space pressurization
control to the bottom fitting. 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 a
ffected by sudden static pressure changes.
Impor
tant: If the building has two or more large areas,
the static pressures can be averaged by
routing equal length tubes to each location.
Figure 14. Removing fan assembly shipping hardware — W_HE casing 9
To Next Page
Loading...
