Desa SDVBNC Owner's Operation And Installation Manual

Also see for PSCIVFC Series: OWNER'S OPERATION AND INSTALLATION MANUAL

107304-01DFor more information, visit www.desatech.comFor more information, visit www.desatech.com1717Vertical Termination ConfigurationsFigure 36 through 39 show four different configurations for verticaltermination. All connections must be sealed with high temperaturesilicone sealant as specified in the second warning statement onpage 12.Venting with One 90° ElbowVertical (V) Horizontal (H)5' min. 2' max.6' min. 4' max.7' min. 6' max.8' min. 8' max.20' max. 8' max.Figure 36 - Vertical Venting Configuration Using One 90° ElbowNote: Install restrictorinto 4" collar of burnersystem as shown.VENTING INSTALLATIONContinuedFigure 34 - Cathedral Ceiling Support Box InstallationNonhardening mastic underall edges of support boxbefore nailingFigure 35 - Installed Cathedral Ceiling Support BoxCut hole 1/8" larger than supportbox when projected onto roofline2" minimumbelow finishedceilingCathedral CeilingSupport BoxLevel6. Continue to add pipe sections until the height of the vent capmeets the minimum building code requirements described inFigure 21 on page 11.Note: You must increase vent height forsteep roof pitches. Nearby trees, adjoining rooflines, steeppitched roofs, and other similar factors may cause poor draftor down-drafting in high winds. Increasing the vent height maysolve this problem.7. Twist-lock the vent cap onto the last section of vent pipe andseal outer pipe connection with high temperature silicone seal-ant as specified in the second warning statement on page 12.Note: If the vent pipe passes through any occupied areas above the firstfloor, including storage spaces and closets, you must enclose pipe. Youmay frame and sheetrock the enclosure with standard constructionmaterial. Make sure and meet the minimum allowable clearances tocombustibles. Do not fill any of the required air spaces with insulation.Cathedral Ceiling Installation1. Remove shingles or other roof covering as necessary to cut therectangular hole for the support box. Mark the outline of thecathedral ceiling support box on the roof sheathing using thelocating hole as a center point.2. Cut the hole 1/8" larger than the support box outline (seeFigure 34).3. Lower the support box through the hole in the roof until thebottom of the box extends at least 2" below the ceiling (seeFigure 34). Align the support box vertically and horizontallyusing a level. Temporarily tack the support box in place throughthe inside walls and into the roof sheathing.4. Using tin snips, cut the support box from the top corners downto the roofline and fold the resulting flaps over the roof sheath-ing (see Figure 35). Apply a bead of nonhardening mastic aroundthe top edges of the support box to make a seal between the boxand the roof. Nail in place with roofing nails. Remove any com-bustible material that might be inside of the support box.5. Complete the cathedral ceiling installation by following the sameprocedures outlined in steps 2 through 7 for Flat Ceiling Instal-lation, starting page 16.VENTING INSTALLATIONInstallation for Vertical Termination (Cont.)