D.Inspection, cleaning, priming
Visually inspect the inside of the pipe and fitting sockets and remove all dirt, grease or moisture with a clean dry rag. If wiping fails to clean the surfaces, a chemical cleaner must be used. Check for possible damage such as splits or cracks and replace if necessary.
Marking the depth of entry is a way to check if the pipe has reached the bottom of the fitting socket in Step F. Measure the fitting depth and mark this distance on the pipe O.D. You may want to add several inches to the distance and make a second mark as the primer and cement will most likely destroy your first one.
Apply primer to the surface of the pipe and fitting socket with a natural bristle brush. This process softens and prepares the PVC or CPVC for the solvent cementing step. Move quickly and without hesitation to the cementing procedure while the surfaces are still wet with primer.
E.Application of solvent cement
•Apply the solvent cement evenly and quickly around the outside of the pipe at a width a little greater than the depth of the fitting socket.
•Apply a light coat of cement evenly around the inside of the fitting socket. Avoid puddling.
•Apply a second coat of cement to the pipe end.
STEP E
F.Joint assembly
Working quickly, insert the pipe into the fitting socket bottom and give the pipe or fitting a 1/4 turn to evenly distribute the cement. Do not continue to rotate the pipe after it has hit the bottom of the fitting socket. A good joint will have sufficient cement to make a bead all the way around the outside of the fitting hub. The fitting will have a tendency to slide back while the cement is still wet so hold the joint together for about 15 seconds.
STEP F
G. Cleanup and joint movement
Remove all excess cement from around the pipe and fitting with a dry cotton rag. This must be done while the cement is still soft.
The joint should not be disturbed immediately after the cementing procedure, and sufficient time should be allowed for proper curing of the joint. Exact drying time is difficult to predict because it depends on variables such as temperature, humidity and cement integrity. For more specific information, you should contact your solvent cement manufacturer.
STEP G
CONNECTION TO VENT PIPE
The vent system connects to the vent pipe with and elbow or rubber coupling. This coupling includes gear clamps. These connections must be properly seated and tightened to prevent the leakage of flue gases into the installation area.
With 2 in. venting the straight rubber adapter is used for the connection to the vent pipe. With 3 in. venting a transition adapter is required to change from the 2 in. vent pipe to the 3 in. vent size.
Clean and lightly sand the end of the vent piping that will connect to the rubber coupling.
Loosen the upper clamp on the rubber adapter and insert the sanded end of the vent pipe and tighten the gear clamp.
NOTE: Do not glue or seal in the rubber coupling. Check the venting system to ensure that there is no stress on the connection or the vent pipe which will create a twisting or bending.
| UPPER GEAR |
| CLAMP |
| LOWER |
| GEAR CLAMP |
RUBBER COUPLING/ | RUBBER ADAPTER (2 in.to |
ADAPTER (2”) | 3”) |
FIGURE 30
30 | www.americanwaterheater.com |