RT-SVX34F-EN
21
Installation General Requirements
Condensate Drain Connection
Each commercial rooftop unit is equipped with one (1) 1-
1/4 inch Female PVC condensate drain connection.
Refer to
Figure 11, p. 18
for the location of the connector.
A condensate trap must be installed due to the drain
connection being on the “negative pressure” side of the
fan. Install a P-Trap at the unit using the guidelines in
Figure 14, p. 21
.
Pitch the drain line at least 1/2 inch for every 10 feet of
horizontal run to assure proper condensate flow.
Ensure that all condensate drain line installations comply
with applicable building and waste disposal codes.
O/A Sensor & Tubing Installation
An Outside Air Pressure Sensor is shipped with all units
designed to operate on traditional variable air volume
applications (non-SZ VAV) and units with Statitrac™.
A duct pressure transducer and the outside air sensor is
used to control the discharge duct static pressure to within
a customer-specified controlband. Refer to the illustration
in
Figure 15, p. 21
and the following steps to install the
sensor and the pneumatic tubing.
1.
Remove the O/A pressure sensor kit located inside the
fan section. The kit contains the following items;
•
an O/A static pressure sensor
•
a sensor mounting bracket
•
50’ 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 provided
bracket (near the fan section).
3. Using the #10-32 x 1/2” screws provided, install the O/
A static pressure sensor vertically to the sensor
bracket.
4. Remove the dust cap from the tubing connector
located below the sensor in the vertical support.
5. Attach one end of the 50' 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™
1.
Open the filter access door, and locate the Statitrac
Transducer Assembly illustrated in
Figure 16, p. 22
.
There are two tube connectors mounted on the left of
the solenoid and transducers. 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 indicated in
the illustration.
2. 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 14.
Condensate trap installation
Figure 15.
Pressure tubing
