Rheem Power Direct Vent Series Use and Care Manual - Page 19

Additional Considerations Caulk Rising moisture will collect under eves Inside corner If soffit vent is too close, block off and install new vent at another location 6 ft. (1.8 m) Caulk 6 ft. (1.8 m) Caulk zone 6 ft. (1.8 m) Caulk zone or to edge of window etc., starting within 6 ft. (1.8 m) Caulk 4 ft.' (1.22 m) Combustion Vent Air-Inlet WARNING: Moisture in the flue gas will condense as it leaves the vent terminal. In cold weather this condensate can freeze on the exterior wall, under the eaves and on surrounding objects. Some discoloration to the exterior of the building is to be expected. However, improper location or installation can result in severe damage to the structure or exterior finish of the building D o Not install the vent terminal under any patio or deck. To help prevent moisture from freezing on walls and under eaves, do not locate the vent terminal on the side of a build­ ing with prevailing winter winds. W hen terminating the vent and combustion air-inlet pipes through brick or masonry surfaces, the installation of a rustresistant sheet metal backing plates behind the vent and combustion air-inlet terminals are recommended. DO Not locate the vent terminal too close to shrubbery, as flue gasses may damage them. Caulk all cracks, seams and joints within six feet (1.83 meters) of the vent and combustion air-inlet terminals. Insulate vent pipe exposed to cold conditions (attics, crawl spaces, etc.) with inflammable material to help prevent moisture from accumulating in the vent pipe. Support horizontal sections of the vent and combustion air-inlet pipe every 4 feet (1.22 meters). DO NOT rigidly secure the vent system. Provisions must be made to allow for expansion and contraction of the vent system. Horizontal Vent and Combustion Air-Inlet Terminal Installation Determine the locations for the vent and combustion air-inlet terminals then make two (2) holes through the exterior wall to accommodate the vent and combustion air-inlet pipes. Maintain a minimum distance of 12 in. (30.5 cm) between the vent and combustion air-inlet terminal centerlines. Insert lengths of vent and combustion air-inlet pipes through the wall as shown. Allow sufficient length of pipe to extend beyond the exterior wall of the building for attachment of the vent and combustion air-inlet terminals. Place the supplied ½ in. (1.3 cm) mesh metal screens inside each terminal fitting and connect the terminals to the vent and combustion airinlet pipes which are extending out of the building. Ensure that the back of the supplied terminals are flush with the outside wall surface. Complete the installation of the remainder of the vent system and attach it to the vent connector fitting on the water heater's blower assembly. Horizontal lengths of the vent system must slope downward away from the water heater a minimum of 1/8 in. per foot (10 mm per meter). Complete the installation of the remainder of the combustion air-inlet system and attach it to the combustion air-inlet connector fitting on the water heater's combustion air-inlet tube assembly. Horizontal lengths of the combustion air-inlet system must slope downward away from the water heater a minimum of 1/8 in. per foot (10 mm per meter). Support vertical and horizontal lengths of the vent and combustion air-inlet systems as previously mentioned. For 75 Gallon Power Direct Vent Models ONLY: These water heater models are supplied with two (2) vent and combustion air-inlet termination restrictors. These restrictors help the water heater achieve peak efficiency when the water heater is installed using 3 in. (7.6 cm) diameter pipe at the minimum equivalent vent and combustion air-inlet lengths specified in Table 2. The termination restrictors must be installed in the same location as the supplied vent and combustion air-intake terminal screens. IMPORTANT: Do not install the termination restrictors in equivalent vent and/or combustion air-inlet lengths longer than 8 feet (2.44 meters) or on any other Power Direct Vent model. Vent and/or combustion air inlet Pipe From Water Heater Inside of Building Outside of Building 2' x 2' (60 m x 60 m) Sheet Metal Shield on Brick or Masonry Walls Terminals with ½" Mesh Protective Screen and Termination Restrictor Inside. Note: Termination Restrictors used on 75 Gallon models ONLY. 12 in. (30.5 cm) Min. Exhaust Vent Terminal Combustion AirInlet Terminal 19