State SDV 75 70 NE/PE - Manual (Page 20)

20
VENTING THROUGH A ROOF
Two 3” inlet and outlet PVC Schedule 40 - 45° vent caps are supplied.
A 5’ (1.5 m) section of 3” CPVC Schedule 40 outlet vent pipe is
supplied. More may be required and must be purchased locally.
1. The water heater requires its own (separate) venting system.
2. Only 3" CPVC Schedule 40 piping and Schedule 80 fi ttings
are acceptable materials on the fi rst fi ve feet of the outlet vent
system.
3. 3” PVC, ABS, or CPVC Schedule 40 piping and fi ttings are
acceptable materials for the inlet vent system and for the outlet
vent system after the fi rst fi ve feet (1.5 m).
4. The unit cannot be connected to existing vent piping or chimney.
5. Venting must terminate vertically to the outdoors.
6. The total vertical and horizontal vent runs cannot exceed the
maximum length with a maximum number of 90° elbows as
specifi ed in the table below. If more elbows are required, the
venting distance must be reduced 5 feet for every 90° elbow.
TABLE 2: The number of 90° elbows shown in the table is for both
the intake air and vent pipes. IE: The vent pipe can contain three 90°
elbows, the intake air pipe can also contain three 90° elbows.
3" DIA. VENTS MAX.
LENGTH (FT.)
NUMBER OF 90°
ELBOWS*
45 1
40 2
35 3
*NOTE: Two 45° elbows are equivalent to one 90° elbow. One 90°
elbow equals 5 feet (1.5 m) of equivalent vent length.
FIGURE 27.
VENT PIPE PREPARATION
1. INITIAL PREPARATION
A. Make sure the solvent cement you are planning to use is
designed for the specifi c application you are attempting.
B. Know the physical and chemical characteristics and
limitations of the PVC, ABS and CPVC piping materials that
you are about to use.
C. Know the reputation of your manufacturer and their products.
D. Know your own qualifi cations or those of your contractor. The
solvent welding technique of joining PVC, ABS and CPVC pipe
is a specialized skill just as any other pipe fi tting technique.
E. Closely supervise the installation and inspect the fi nished
job before start-up.
F. Contact the manufacturer, supplier, or competent consulting
agency if you have any questions about the application or
installation of PVC, ABS and CPVC pipe.
G. Take the time and effort to do a professional job. Shortcuts
will only cause you problems and delays in start-up. By far,
the majority of failures in PVC, ABS and CPVC systems are
the result of shortcuts and/or improper joining techniques.
2. SELECTION OF MATERIALS
• Cutting Device - Saw or Pipe Cutter
• Deburring Tool, Knife, File, or Beveling Machine (2” [5 cm] and above)
• Brush - Pure Bristle
• Rag - Cotton (Not Synthetic)
• Primer and Cleaner
• Solvent Cement - PVC for PVC Components and CPVC for
CPVC Components and ABS for ABS components.
• Containers - Metal or Glass to hold Primer and Cement. Select
the type of PVC, ABS or CPVC materials to be used on the basis
of their application with respect to chemical resistance, pressure
rating, temperature characteristics, etc.
• Insertion Tool - Helpful for larger diameter pipe and fi ttings 6
inches (15.2 cm) and above.