Instructions / Assembly

INSTALLING THE TUBING
Use the following installation guidelines when installing tubing.
1. Start tubing installation at farthest inlet and work
toward the power unit.
2. Tubing run to the power unit should be as straight as possible.
3. When assembling sections with elbows and tees,
make sure the curve in the fitting is aligned so that the
air flows toward the power unit.
4. Branch lines should always join the trunk line from
above or from the same level. Never join a branch line
from an angle below the trunk line.
5. Refer to Figure 25 on page 9. Run low voltage wiring
(Model 376UL) and secure wiring to tubing as tubing is
installed. Model CF380 Pipe Support can be used to
support long runs of tubing (position near joists) and to
clip wire along tubing. Secure tubing to joists or studs.
Leave approximately 6" of wire for connection to each inlet.
6. Cut a 2 ½" diameter hole in sole plate, header or stud
directly in line with opening of inlet bracket fitting.
NOTE: See Figure 13 for center line dimensions.
7. Refer to Figure 14. Measure length of tubing needed
to connect inlet to trunk line. Allow approximately 3⁄4"
of tubing for inserting into fittings.
8. Refer to Figure 15. Cut tubing, keeping cut square.
9. Refer to Figure 16. Remove burrs from both inside
and outside of tubing.
10. Before cementing, pre-assemble section to inlet
fitting, check for proper length.
11. Refer to Figure 17. Apply PVC cement (Model 379) to
outside of tubing. Coat tubing approximately 1" back.
Take care to keep cement from inside of tube.
12. Refer to Figure 18. Insert tubing into fitting with a
twisting motion to evenly spread cement. Be sure
tubing is firmly seated in fitting.
13. If fittings have been attached to tubing at the end
opposite the inlet bracket, be sure alignment is
proper before cement sets.
14. Refer to Figure 19. Tape wire to tubing to hold in place
and insert through hole in inlet bracket.
15. Connect each inlet line and branch line into main
trunk line. Complete low voltage wiring as main trunk
line is continued back to power unit.
8
FIGURE 13
INCLUDE FITTING
RECESS IN
MEASUREMENT
TUBING MEASUREMENT
PVC TUBING
FITTING
FITTING
3
/4"
3
/4"
FIGURE 14
FIGURE 15 FIGURE 16
FIGURE 17 FIGURE 18
FIGURE 19
CAUTION
When tubing is run through the wall stud, sole plate,
headers or else where building materials will be
attached, place a nail (Model 378) over that area
(on both sides if necessary) to prevent nails from
piercing tubing.