15
Supply Tubing Installation
Kwik-connects and balancing orifices are provided in the
Installation Kits. Plenum take-offs, gaskets and fasten-
ers are supplied in the separate plenum take-off kits.
Avoid sharp bends in the supply tubing (as well as the
sound attenuating tube). The minimum radius bend is 4"
(see Figure 2.16); however, wherever possible, hold to a
larger radius.
At the plenum, all supply tubing connections must be
a minimum of 18" from any plenum tee, plenum elbow
or the fan coil unit.
Individual supply tubing runs
must be a minimum of
6-feet
, even if the distance between the sound attenuat-
ing tubing and plenum is less than 6 feet.
Supply tubing comes in 100-foot sections (R8 tubing
comes in 75-foot sections and R6 tubing comes in 100-
foot sections) and may be cut to length with a knife or fine
tooth hacksaw.
For each supply tubing run, estimate and cut the length
of tubing that will be needed between the plenum and
sound attenuating tube. At the open end of the supply
tubing a kwik-connect will be installed (see Figure 2.17).
First, push back the cover and the insulation exposing
approximately 4" of the inner core. Fold in any tails or
frays that may be present after cutting the supply tubing.
Second, hand compress the corrugations until they are
densely compacted 1-1/2" to 2" from the open end of the
supply tube. Third, thread kwik-connect into the inner
core until snug. Fourth, pull the insulation and cover for-
ward and tuck it into the deep groove on the back side of
the kwik-connect. Fifth, wrap the connection securely
with UL181 approved tape..
When finished, simply twist together (see Figure 2.18)
the kwik-connect on the sound attenuating tube, and
wrap the connection securely with tape.
After attaching the supply tubing to the sound attenuating
tube, bring the open end of the tubing to the plenum.
To cut a hole in the plenum, refer to duct installation
instructions supplied with fan coil unit. Sheet metal duct
requires a 2-1/16" hole.
Remove the hole cut-out from the plenum. Make sure
there is no “flap” left inside plenum that could block hole
during operation.
4" MINIMUM RADIUS
FIGURE 2.16: MINIMUM TUBING BEND
AA
AA
AA
TU
BIN
G
RO
UT
ING
FIGURE 2.15: POSITIONING ROOM TERMINATOR
AAA
AAA
AAA
FIGURE 2.17: KWIK-CONNECT INSTALLATION
FIGURE 2.18: CONNECTING TUBING
Center the two spring clips on a line parallel to the
direction of the tubing routing from the room terminator
(see Figure 2.15). This is important since the weight
of the tubing will have a tendency to cause a part of the
terminator to pull away from the ceiling if the clips and
tubing do not run parallel.
Then tighten the screws (attached to the terminator) until
the terminator is snug against the ceiling or floor.
Do
not overtighten.
For installations with floors or ceilings
which are thicker than normal, longer toggle screws
or special mounting plates may be required.
