Raypak 503A Installation & Operating Instructions Manual

Raypak 503A Installation & Operating Instructions Manual Manual pdf 28 page image

281. Vent must terminate at least 4 ft below, 4 ft hori-zontally from or 1 ft above any door, window orgravity air inlet to the building.2. The vent must not be less than 7 ft above gradewhen located adjacent to public walkways.3. Terminate vent at least 3 ft above any forced airinlet located within 10 ft.4. Vent must terminate at least 4 ft horizontally, andin no case above or below unless 4 ft horizontaldistance is maintained, from electric meters, gasmeters, regulators, and relief equipment.5. Terminate vent at least 6 ft away from adjacentwalls.6. DO NOT terminate vent closer than 5 ft below roofoverhang.7. The vent terminal requires a 12 in. vent terminalclearance from the wall.8. Terminate vent at least 1 ft above grade, includingnormal snow line.9. Multiple direct vent installations require a 4 ftclearance between the ends of vent caps locatedon the same horizontal plane.Canadian InstallationsRefer to latest edition of the B149 Installation Code.A vent shall not terminate:1. Directly above a paved sidewalk or drivewaywhich is located between two single-family dwell-ings and serves both dwellings.2. Less than 7 ft (2.13 m) above a paved sidewalk orpaved driveway located on public property.3. Within 6 ft (1.8 m) of a mechanical air supply inletto any building.4. Above a meter/regulator assembly within 3 ft (915mm) horizontally of the vertical centre-line of theregulator.5. Within 6 ft (1.8 m) of any gas service regulatorvent outlet.6. Less than 1 ft (305 mm) above grade level.7. Within 3 ft (915 mm) of a window or door whichcan be opened in any building, any non-mechani-cal air supply inlet to any building or thecombustion air inlet of any other appliance.8. Underneath a verandah, porch or deck, unless theverandah, porch or deck is fully open on a mini-mum of two sides beneath the floor, and thedistance between the top of the vent terminationand the underside of the verandah, porch or deckis greater than 1 ft (305 mm).Venting Installation TipsSupport piping:• horizontal runs—at least every 5 ft (1.5m)• vertical runs—use braces• under or near elbowsVenting ConfigurationsFor heaters connected to gas vents or chimneys, ventinstallations shall be in accordance with the NFGC(U.S.), or B149 (Canada), or applicable provisions oflocal building codes.Vertical Venting (Category IV)InstallationThe maximum and minimum venting length for thisCategory IV appliance shall be determined per theNFGC (U.S.) or B149 (Canada).The diameter of vent flue pipe should be sized accord-ing to the NFGC (U.S.) and Appendix B of B149(Canada). The minimum flue pipe diameter for con-ventional venting using Category IV, stainless steel ULWARNING: Examine the venting system at leastonce a year. Check all joints and vent pipeconnections for tightness, corrosion or deterioration.CAUTION: This venting system requires theinstallation of a condensate drain in the vent pipingper the vent manufacturer’s instructions. Failure toinstall a condensate drain in the venting system willvoid all warranties on this heater.WARNING: The Commonwealth of Massachusettsrequires that sidewall vented heaters, installed inevery dwelling, building or structure used in whole orin part for residential purposes, be installed usingspecial provisions as outlined on page 56 of thismanual.