Laars NEOTHERM NTH Installation And Operation Instructions Manual

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Laars NEOTHERM NTH Installation And Operation Instructions Manual Manual pdf 10 page image

LAARS Heating SystemsPage 10Method 1: Two permanent openings, onecommencing within 12" (300mm) of the top and onecommencing within 12" (300mm) of the bottom, of theenclosure shall be provided. The openings shallcommunicate directly, or by ducts, with the outdoors orspaces that freely communicate with the outdoors.When directly communicating with the outdoors, orwhen communicating to the outdoors through verticalducts, each opening shall have a minimum free area of 1square inch per 4000 Btu/hr (550 square mm/kW) oftotal input rating of all equipment in the enclosure.When communicating to the outdoors throughhorizontal ducts, each opening shall have a minimumfree area of not less than 1 square inch per 2000 Btu/hr(1100 square mm/kW) of total input rating of allequipment in the enclosure.Method 2: One permanent opening, commencingwithin 12" (300mm) of the top of the enclosure, shall bepermitted. The opening shall directly communicate withthe outdoors or shall communicate through a vertical orhorizontal duct to the outdoors or spaces that directlycommunicate with the outdoors and shall have aminimum free area of 1 square inch per 3000 Btu/hr(734 square mm/kW) of the total input rating of allequipment located in the enclosure. This opening mustnot be less than the sum of the areas of all ventconnectors in the confined space.Other methods of introducing combustion andventilation air are acceptable, providing they conform tothe requirements in the applicable codes listed above.In Canada, consult local building and safety codes or,in absence of such requirements, follow CAN/CGA B149.2.1.2 Intake Combustion AirThe combustion air can be taken through the wall, orthrough the roof. When taken from the wall, it must betaken from out-of-doors by means of the LAARShorizontal wall terminal, shown in Table 3. See Table 2 toselect the appropriate diameter air pipe. When taken fromthe roof, a field-supplied rain cap or an elbow arrangementmust be used to prevent entry of rain water (see Figure10).Use ABS, PVC, CPVC or galvanized pipe for thecombustion air intake (see Table 4), sized per Section 1.8.Route the intake to the boiler as directly as possible. Sealall joints. Provide adequate hangers. The unit must notsupport the weight of the combustion air intake pipe.Maximum linear pipe length allowed is shown in Table 2.Subtract 5 allowable linear ft. (1.5m) for every elbow used.The connection for the intake air pipe is at the top ofthe unit.In addition to air needed for combustion, air shallalso be supplied for ventilation, including air required forcomfort and proper working conditions for personnel.2.2 VentingWARNINGFailure to use CPVC or stainless steel venting for thefirst 20" (285-500) / 30" (80-210) of vent material orfor any part of the venting that is installed inside acloset may lead to property damage, personal injuryor death. The proper length of this material issupplied with boiler.WARNINGFailure to use the appropriate vent material,installation techniques, glues/sealants could lead tovent failure causing property damage, personal injuryor death.WARNINGAll venting must be installed according to this manualand any other applicable local codes, including butnot limited to, ANSI Z223.1/NFPA 54, CSA B149.1,CSAB149.2 and ULC-S636. Failure to follow thismanual and applicable codes may lead to propertydamage, severe injury, or death.The flue temperature of the NeoTherm changesdramatically with changes in operating watertemperature. Therefore, it is necessary to assess theapplication of the boiler to determine the requiredcertified vent class. If the NeoTherm is installed inan application where the ambient temperature iselevated, and/or installed in a closet/alcove, CPVC orstainless steel material is required. If the systemtemperatures are unknown at the time ofinstallation, class IIB or higher venting material isrecommended.Figure 10. Combustion Air and Vent Through Roof.