RPV-I&S
TABLE - 8
VENT CONNECTOR LENGTHS FOR 3" (7.6 cm) DIAMETER PVC
| Terminating | # of 90° Elbows | Maximum | Minimum | ||
|
| (excluding vent | Length | Length | ||
|
| terminal) |
|
|
|
|
| Through the Wall | 0 | 105 ft (32.0 m) | 10 ft (3.1 m) | ||
| Through the Wall | 1 | 1100 ft (30.5 m) | 10 ft (3.1 m) |
|
|
| Through the Wall | 2 | 95 ft (29.0 m) | 10 ft (3.1 m) | ||
| Through the Wall | 3 | 90 ft (27.5 m) | 10 ft (3.1 m) | ||
| Through the Wall | 4 | 85 ft (26.0 m) | 10 ft (3.1 m) | ||
| Through the Wall | 5 | 80 ft (24.4 m) | 10 ft (3.1 m) |
| |
| Through the Roof | 0 | 55 ft (16.8 m) | 5 ft (1.5 m) |
| |
| Through the Roof | 1 | 50 ft (15.3 m) | 5 ft (1.5 m) |
| |
| Through the Roof | 2 | 45 ft (13.7 m) | 5 ft (1.5 m) |
| |
| Through the Roof | 3 | 40 ft (12.2 m) | 5 ft (1.5 m) | ||
| Through the Roof | 4 | 35 ft (10.7 m) | 5 ft (1.5 m) |
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NOTE: When using 3" (7.6 cm) PVC, use a 3" (7.6 cm) to 2" (5.1 cm) reducer and exit the building wall with 2"(5.1 cm) PVC using the 2" (5.1 cm) 45° vent terminal supplied. Two 45° elbows are equivalent to one 90° elbow. Each 90° elbow is equivalent to 5 feet (1.5 m) of straight vent pipe.
Figure 6
distance between the edge of the 45° vent terminal and the exterior wall (see Figure 8) must be at least 1 inch (2.5 cm). Use the proper cement and assembly procedures to secure the vent connector joints between the terminal and the blower outlet. Provide support brackets for every 3 feet (0.91 m) of horizontal vent.
Figure 8
THROUGH THE ROOF VENTING: (VERTICAL VENTING)
Cut the necessary holes through the roof and ceiling and install the vent connector as shown in (Figure 9). Make sure that the installation meets the local codes and/or The National Fuel Gas Code ANSI Z223.1 (Latest Edition) or CGA/CAN B149 Installation Code.
IMPORTANT
All of the Venting connections must be leak checked with a soap and water solution upon initial start up of the water heater. Any leaks must be repaired before continuing operation of the water heater.
NOTE: ABS or CPVC pipes may be substituted for PVC pipe. Do not mix ABS and PVC pipe in the same installation.
Figure 7
THROUGH THE WALL VENTING:
Cut a 2 ½ inch (6.4 cm) diameter hole in the wall at the point where the vent connector is going to pass through the wall. Use the proper cement to secure the 45° vent terminal provided with the water heater to the vent connector. The
Figure 9
THROUGH THE WALL VENTING WITH LOW GROUND CLEARANCE: When venting cannot exit through the wall at a height greater than or equal to 12" (30.5 cm) from the ground or from the anticipated snow level, then the installation must be modified as shown below see Figure 10. Refer to Table 9 for maximum venting lengths using 2" (5.1 cm) PVC or Table 10 for maximum lengths using 3" (7.6 cm) PVC.
Figure 10
6
