VENT ATTENUATION ASSEMBLY
INSTALLATION INSTRUCTIONS
The Vent Attenuation Assembly (VAA) is designed to provide a reduction in fan noise created in the blower wheel. This installation of this VAA is optional. Review directions thoroughly prior to installing the new VAA. Please contact the manufacturer of the water heater as shown in the instruction manual with any questions or for additional product support.
VENT ATTENUATION ASSEMBLY KIT PARTS LIST
The kit consists of the following items. If a part is missing, use the contact information in the instruction manual to acquire missing component(s).
•vent attenuation assembly
•flexible tubing
•hose barb
•hex plug (installed on VAA)
•instruction sheet
support the VAA and the surrounding vent pipe could create a hazardous situation. DO NOT puncture any surface of the VAA.
5.Confirm that the hex plug is securely installed in the 1/2" fitting found on the center of the VAA pipe. It is imperative that the plug is secure and air tight to prevent any combustion gases escaping into the room. If the plug is not securely tightened, remove and reinstall using Teflon tape on the threads. Once installed along with the rest of the vent configuration, make sure to operate the unit through at least one heat up cycle to ensure there is no leakage around the plug or any joints of the VAA or vent pipe system.
VENT ATTENUATION ASSEMBLY INSTALLATION
The VAA is designed for both vertical and horizontal installations. The vertical installation does not require the additional hose barb and flexible tubing. However, the horizontal installation will require the hose barb and flexible tubing to release condensate buildup from the VAA. See instructions and diagrams that follow for a more detailed description.
Vertical VAA Installations (Recommended)
1.The VAA is designed to accept two inch PVC pipe into the adapters on both ends. The VAA can be installed to the piping from either side (there is no specific inlet or outlet). For optimum performance, install VAA as close as possible to the blower assembly.
2.Use standard PVC cement (not included with kit) and glue the two inch PVC pipe coming from the blower into the VAA.
3.Perform the same sequence on the PVC pipe coming from the exhaust side (vent terminal side) of the VAA.
4.Make sure the VAAand vent pipe is supported securely to a permanent fixture (stud or wall). Use standard support straps (not supplied with kit) that may be found at a local hardware store. Failure to properly
FIGURE 22: Typical Vertical Installation
Horizontal VAA Installations
1.The VAA is designed to accept two inch PVC pipe into the adapters on both ends. The VAA can be installed to the piping from either side (there is no specific inlet or outlet). For optimum performance, install VAA as close as possible to the blower assembly.
2.Use standard PVC cement (not included with kit) and glue the two inch PVC pipe coming from the blower into the VAA. Make sure the 1/2" fitting is on the bottom side of the VAA. This will be used to run the condensate hose to a suitable drain. See typical vent installation in Figure 23.
3.Perform the same sequence on the PVC pipe coming from the exhaust side (vent terminal side) of the VAA.
4.Make sure the VAAand vent pipe is supported securely to a permanent fixture (stud or wall). Use standard support straps (not supplied with kit) that may be found at a local hardware store. Failure to properly support the VAA and the surrounding vent pipe could create a hazardous situation. DO NOT puncture any surface of theVAA.
5.Remove hex plug from the center pipe of the VAA. Locate the hose barb and install into the 1/2" fitting on the center of the VAA. Using Teflon tape on the threads, install hose barb into 1/2" fitting securely. It is imperative that the hose barb is secure and tight to prevent any combustion gases escaping into the room.
6.Locate flexible tubing. Slide one end of tube over the hose barb located on the center pipe of the VAA. The ridges on the hose barb should prevent the tube from sliding off, however, to ensure there are no leaks and possible dislocation from hose barb, use a wire tie or hose clamp (not supplied with kit) and secure.
7.Take the other end of the flexible tubing and form an 8 inch (20 cm) diameter circle approximately 3 feet (91 cm) down from the hose barb located in the VAA. To ensure that the circle (loop) maintains its shape, use two wire ties (not supplied with kit) to secure it.
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