Laars NeoTherm NTH Installation And Operation Instructions Manual

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NeoTherm Boilers and Water Heaters Page 151. Figure 12 shows the requirements for mechanicalvent terminal clearances for the U.S. and Canada.2. Vent terminals for condensing appliances orappliances with condensing vents are notpermitted to terminate above a public walkway, orover an area where condensate or vapor couldcreate a nuisance or hazard.3. Locate the vent terminal so that vent gases cannotbe drawn into air conditioning system inlets.4. Locate the vent terminal so that vent gases cannotenter the building through doors, windows, gravityinlets or other openings. Whenever possible, avoidlocations under windows or near doors.5. Locate the vent terminal so that it cannot beblocked by snow. The installer may determinethat a vent terminal must be higher than theminimum shown in codes, depending upon localconditions.6. Locate the terminal so the vent exhaust does notsettle on building surfaces or other nearby objects.Vent products may damage surfaces or objects.7. If the boiler or water heater uses ductedcombustion air from an intake terminal located onthe same wall, see Figures 12-14 for properspacing and orientation.If the vent termination is located in an areaexposed to high winds, an optional PVC tee (the samediameter as the vent pipe) may be used. The tee'd venttermination offers greater protection from wind relatedoperating issues.3.3.2 Side Wall Combustion Air TerminalThe LAARS side wall combustion air terminal, orconcentric terminal (see Table 3), must be used whenthe heater takes air from a side wall. Contact Laars forAL29-4C termination fittings. Consider the followingwhen installing the terminal (see Figures 12-14):1. Do not locate the air inlet terminal near a source ofcorrosive chemical fumes (e.g., cleaning fluid,chlorine compounds, etc.)2. Locate the terminal so that it will not be subject todamage by accident or vandalism. It must be atleast 7 feet (2.1m) above a public walkway.3. Locate the combustion air terminal so that itcannot be blocked by snow. The National Fuel GasCode requires that it be at least 12 inches (30cm)above grade, but the installer may determine itshould be higher, depending upon local conditions.4. If the NeoTherm is side-wall vented to the samewall, locate the vent terminal at least 1 foot (0.3m)above the combustion air terminal.5. For concentric vent, follow instructionsincluded with vent kit.6. Multiple vent kits should be installed such that thehorizontal distance between outlet group and inletgroup is 36" (90cm) (see Figure 13).7. Vent outlet for models 80-285 must be no lowerthan the center of the air inlet, and must be at least12" (30cm) away from the air inlet. Vent outletsfor models 399-850 must be at least 12" above thetop of the air inlet, and must be at least 36" (90cm)horizontally from the air inlet (see Figure 14).3.3.3 Vertical Vent TerminalWhen the unit is vented through the roof, the ventmust extend at least 3 feet (0.9m) above the point atwhich it penetrates the roof. It must extend at least 2feet (0.6m) higher than any portion of a building withina horizontal distance of 10 feet (3.0m), and high enoughabove the roof line to prevent blockage from snow. Thevent terminal included with the NeoTherm can be usedin both vertical and horizontal applications. When thecombustion air is taken from the roof, the combustionair must terminate at least 12" (30cm) below the ventterminal (see Figure 11).3.3.4 Vertical Combustion Air TerminalWhen combustion air is taken from the roof, afield-supplied rain cap or an elbow arrangement must beused to prevent entry of rain water (see Figure 11). Theopening on the end of the terminal must be at least 12"(30cm) above the point at which it penetrates the roof,and high enough above the roof line to prevent blockagefrom snow. When the vent terminates on the roof, thecombustion air must terminate at least 12" (30cm)below the vent terminal.3.3.5 Installations in the Commonwealth ofMassachusettsIn Massachusetts the following items are required ifthe side-wall exhaust vent termination is less than seven (7)feet above finished grade in the area of the venting,including but not limited to decks and porches. FromMassachusetts Rules and regulations 248 CMR 5.081. Installation of Carbon Monoxide DetectorsAt the time of installation of the side wall ventedgas fueled appliance, the installing plumber or gas-fitter shall observe that a hard-wired carbon monox-ide detector with an alarm battery back-up is instal-led on the floor level where the gas appliance is tobe installed. In addition, the installing plumber orgasfitter shall observe that a battery operated orhard-wired carbon monoxide detector with an alarmis installed on each additional level of the dwelling,building or structure served by the side-wall hori-zontally vented gas fueled equipment. It shall be theresponsibility of the property owner to secure theservices of qualified licensed professionals for in-stallation of hard-wired carbon monoxide detectors.a. In the event that the side-wall horizontally ventedgas fueled equipment is installed in a crawl space oran attic, the hard-wired carbon monoxide with alarmand battery back-up may be installed on the nextadjacent floor level.b. In the event that the requirements of the subdivi-sion cannot be met at the time of completion ofinstallation, the owner shall have a period of thirty