The unit may be vented horizontally through a wall or vertically through the roof. Pipe runs must be adequately supported along both vertical and horizontal runs as follows:
•For Schedule 40, 2" PVC, ABS, Coex Cellular Core vent pipe: Every 3 feet (0.9 m).
•For Schedule 40, 3" PVC, ABS, Coex Cellular Core vent pipe: Every 3.5 feet (1.1 m).
•For Schedule 40, 4" PVC, ABS, Coex Cellular Core vent pipe: Every 4 feet (1.2 m).
•For Schedule 40, 2" CPVC vent pipe: Every 5 feet (1.5 m).
•For Schedule 40, 3" CPVC vent pipe: Every 6 feet (1.8 m).
•For Schedule 40, 4" CPVC vent pipe: Every 6.5 feet (2.0 m).
It is imperative that the first hanger (or support) be located on the horizontal run immediately adjacent to the first
If the water heater is being installed as a replacement for an existing power vented heater in
Except where instructed in this manual, the mixing of 2", 3" and 4" vent pipe is NOT ALLOWED. If 2" pipe is to be used, then a 2" to 3" bell reducer is recommended. Figure 21 shows the recommended location for the bell reducer. If the bell reducer is located at the rubber boot on the blower assembly, then a short section of 3" vent pipe needs to be installed in the rubber boot for proper connection of the 2" to 3" bell reducer. That length can be the minimum length required for the connection.
If 4" pipe is to be used, then a 3" to 4" bell reducer is recommended. Figure 21 shows the recommended location for the bell reducer. If the bell reducer is located at the rubber boot on the blower assembly, then a short section of 3" vent pipe needs to be installed in the rubber boot for proper connection of the 3" to 4" bell reducer. That length can be the minimum length required for the connection.
The water heaters covered by this manual are supplied with a 2" Schedule 40 PVC 22.5° Vent Terminal. If you decide to vent with 3" or 4" pipe, a Schedule 40 DWV 45° VentTerminal must be used. For your convenience, we have included a screen for both 3" and 4" Vent Terminals.
The vent piping should be connected to the blower with a rubber adapter and secured with hose clamps. The adapter and clamps are provided with the heater.
Even though the flue gas temperature leaving the blower is between 140°F (69°C) and 175°F (79°C), some installations will have water vapor condense intheventpiping.Ifthisoccurs,thenadequatemeansofdraininganddisposing of the condensate needs to be made by the installer.
CONDENSATION
Condensate formation does not occur in all installations of power vented water heaters, but should be protected against on installations where it can form in the venting system. Condensation in the venting system of power vented water heaters is dependent upon installation conditions including, but not limited to ambient temperature and humidity of installation location, ambient temperature and humidity of venting space, vent discharge and slope, and product usage. In certain conditions, installations in unconditioned space or having long horizontal or vertical vent runs may accumulate condensate. In these conditions, the vent pipe should be sloped downward away from the blower assembly 1/4" (6.4 mm) per five feet (1.5 m) of pipe but not more than 1 1/2" (3.8 cm) in the total vent length. If the vent piping is vented level or sloped upwards away from the blower assembly, then adequate means for draining and disposing of the condensate needs to be made by the installer (if condensate is detected). If you have condensate, then a 3/8" drain hose can be connected to the
MAXIMUM VENT LENGTHS
40,000 BTU Units:
For 2" Venting, the maximum equivalent feet of pipe allowed is 40 feet (12.2 m). This does not include the supplied vent termination for the water heater. For the 2" venting, one 90° elbow is approximately equal to 5 feet (1.5 m). One 45° elbow is approximately equal to 2.5 feet (0.8 m). It is recommended that at least 2 feet (0.6 m) of spacing be used in between all 45° elbows and all 90°elbows.
For 3" Venting, the maximum equivalent feet of pipe allowed is 120 feet (36.6 m). This does not include the Vent Termination (supplied locally) for the water heater. For the 3" venting, one 90° elbow is approximately equal to 5 feet (1.5 m). One 45° elbow is approximately equal to 2.5 feet (0.8 m). It is recommended that at least 2 feet (0.6 m) of spacing be used in between all 45° elbows and all 90°elbows.
For 4" Venting, the maximum equivalent feet of pipe allowed is 160 feet (48.8 m). This does not include the Vent Termination (supplied locally) for the water heater. For the 4" venting, one 90° elbow is approximately equal to 8 feet (2.4 m). One 45° elbow is approximately equal to 4 feet (1.2 m). It is recommended that at least 2 feet (0.6 m) of spacing be used in between all 45° elbows and all 90°elbows.
50,000 BTU Units:
For 2" Venting, the maximum equivalent feet of pipe allowed is 40 feet (12.2 m). This does not include the supplied Vent Termination for the water heater. For the 2" venting, one 90° elbow is approximately equal to 5 feet (1.5 m). One 45° elbow is approximately equal to 2.5 feet (0.8 m). It is recommended that at least 2 feet (0.6 m) of spacing be used in between all 45° elbows and all 90°elbows.
For 3" Venting, the maximum equivalent feet of pipe allowed is 120 feet (36.6 m). This does not include the Vent Termination (supplied locally) for the water heater. For the 3" venting, one 90° elbow is approximately equal to 5 feet (1.5 m). One 45° elbow is approximately equal to 2.5 feet (0.8 m). It is recommended that at least 2 feet (0.6 m) of spacing be used in between all 45° elbows and all 90°elbows.
For 4" Venting, the maximum equivalent feet of pipe allowed is 160 feet (48.8 m). This does not include the Vent Termination (supplied locally) for the water heater. For the 4" venting, one 90° elbow is approximately equal to 8 feet (2.4 m). One 45° elbow is approximately equal to 4 feet (1.2 m). It is recommended that at least 2 feet (0.6 m) of spacing be used in between all 45° elbows and all 90°elbows.
18