Navien NPE-180A Installation Manual

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Navien NPE-180A Installation Manual Manual pdf 28 page image

Installing the Water Heater 273.6 Venting the Water HeaterWARNINGImproper venting of the water heater can result in excessivelevels of carbon monoxide, which can lead to severe personalinjury or death. This water heater must be vented inaccordance with the “Venting of Equipment“ section ofthe latest edition of the ANSI Z223.1/NFPA 54 Natural FuelGas Code in the USA and/or the “Venting systems and airsupply for water heaters“ section of the latest version ofthe CAN/CGA B149.1 Natural Gas and Propane InstallationCode in Canada, as well as all applicable local buildingcodes and regulations. Follow all instructions and guidelineswhen venting the water heater. Venting should be performedonly by a licensed professional.The water heater must be properly vented to ensure a constantsupply of clean intake air and to ensure that exhaust air is properlyremoved from living areas. When venting the water heater, followthese guidelines: Do not install the water heater in areas with contaminated air(containing a high level of dust, sawdust, sand, flour, aerosols,or any other such airborne contaminants), as contaminantscan cause operational problems. The warranty does not coverdamage caused by contaminants in the installation area. If youmust install the water heater in an area with contaminated air,use direct venting to supply air from outside the building. Werecommend regular filter cleaning and maintenance in theseareas. For best results, keep the venting system as short and straight aspossible. Locate the water heater as close as possible to the venttermination. Do not connect the water heater vent to a vent for any other gaswater heater or vent stack. For horizontal runs, slope the horizontal section upward towardthe vent termination at a rate of 1/4" per foot (2% slope). Create an airtight seal at each joint in the exhaust and intake airpipes from the water heater collar to the vent termination. To avoid moisture and frost build-up and to maintain clearancesto openings on adjacent homes, 45° elbows, 90° elbows, or teesmay be attached to the end of the termination vent pipe todirect the exhaust plumes away from buildings, as long as thetotal allowable vent lengths, maximum number of elbows, anddistances to air intake restrictions are observed. Do not store hazardous or flammable substances near the venttermination. If this water heater will be installed in areas where snow isknown to accumulate, protect the vent termination fromblockage. Ensure that the vent termination is at least 12" (305mm) aboveground, or as required by local codes. Support the vent pipe with hangers at regular intervals or asrequired by local codes. Exhaust and intake air pipes must be supported at least every 4feet (1.2m). The vent for this appliance shall not terminate over publicwalkways; or near soffit vents or crawl space vents or wherecondensate or vapor could create a nuisance or hazard or causeproperty damage; or where condensate or vapor could causedamage or could be detrimental to the operation of regulators,relief valves, or other equipment.3.6.1 Selecting a Vent TypeAll water heaters are prepared at the factory to be direct vent(sealed combustion) water heaters that draw all of their requiredcombustion air directly from outside the building. Navienrecommends direct air vent installations whenever possible toavoid back drafting cold air through the water heater. If you cannotuse a direct vent, ensure that an ample supply of make-up air isavailable in the installation location.Navien also recommends installing a new vent system with thisappliance. If reusing an existing vent system, thoroughly inspectit for punctures, cracks, or blockages prior to connecting it to thewater heater.Direct VentingThe water heater uses 2" or 3" diameter exhaust and 2" or 3"diameter intake air ducts. To ensure the draw of air directly fromand exhaust of air directly to the outside of the building, create anairtight seal from the water heater collar to the vent termination.Intake materials can be made of ABS, PVC, CPVC, PP, galvanizedsteel, corrugated aluminum or any other such materials. If youuse a corrugated material, ensure that there is not inadvertentcrimping of, or damage to, the intake air pipe.When using direct venting, maintain the following ventingclearances, as required by ANSI Z21.10.3 and the National FuelGas Code, ANSI Z223.1/NFPA 54, and CAN/CGA B149.1 NaturalGas and Propane Installation Code: