NuTone Central Vacuum Installation Guide (p.3)

**IMPORTANT**
Vacuum tubing is a special pipe for vacuum systems only. It is not plumbing pipe. DO NOT use PVC thick wall plumbing pipe, the fittings will not match.

Cutting the tubing

Frequently, chimneys are framed or "boxed." Before you cut a length of tube, accurately measure the length you need. allow 5/8" of tubing for inserting into fittings and 1 1/2" for placing into flexible tubing. Cut the plastic tubing with a hacksaw, making sure that the cut is exactly square. You can use a tube cutter if one is available. Use wire cutters or tin snips to cut flexible tubing. The 8" lengths of flexible tubing supplied with each inlet should not be cut.

Use a small knife to remove any burrs from the inside of the tube. You can also use steel wool to remove burrs. The burrs must be removed or air flow may be impeded by clogs caused by snagging hair and carpet thread.

Next, use a file to slightly bevel the outside of the tube so that it will easily slide into the fitting. Use steel wool or a light-grained sand paper to buff the surface of the tube which will be glued - this will clean the tube and assure a good seal.

Insert the tube into the fitting, aligning the two parts as they will be installed. Mark the tube and the fitting so that you can quickly realign the joint. The power unit is also equipped with an inlet so that you can directly connect the hose. When you plan, remember the power unit has an inlet in one of your cleaning zones.

Applying Cement

Apply cement only to the outside of the tube. Dab the cement generously in an inch-wide band.

Connecting the fitting and tube

Insert the tube into the fitting with the alignment marks a quarter turn apart and then quickly push and turn the fitting to align the marks and spread the cement. Allow one minute for the joint to dry. You may also use electrical tape or duct tape to further seal the joint.

Cementing flexible tubing

Make sure that the ends of the flexible tubing are even - trim if necessary. When you join flexible tubing to plastic tubing or to an inlet mounting plate, apply cement to both the inside of the flexible tubing and the outside of the plastic tubing or mounting plate tubing ring. Twist the two pieces as you join them to evenly spread the glue. Allow five minutes for the cement to set in flexible tubing. You may also use electrical tape or duct tape to further seal the joint.

Secure wire to tubing

The low voltage power wiring is run along with the tubing. To make sure that the wire is secure and will not hang up in a wall, use electrical tape to attach the wire to the tubing. Tape the wire approximately every 12-18 inches.