Laars NEOTHERM NTH Installation And Operation Instructions Manual

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Page 10LAARS Heating SystemsOther methods of introducing combustion and ventilation airare acceptable, providing they conform to the requirements inthe applicable codes listed above.In Canada, consult local building and safety codes or, inabsence of such requirements, follow CAN/CSA B149.Ducted Combustion AirThe combustion air can be taken through the wall, or throughthe roof. When taken from the wall, it must be taken fromout-of-doors by means of the LAARS horizontal wallterminal, shown in Table 3a and 3b. See Table 2 to select theappropriate diameter air pipe. When taken from the roof, afield-supplied rain cap or an elbow arrangement must be usedto prevent entry of rain water. (See Figure10.)Use ABS, PVC, CPVC or galvanized pipe for the combustionair intake. (See Table 4.) The pipe should be sized per Table2. Route the intake to the boiler as directly as possible. Sealall joints. Provide adequate hangers. The unit must not supportthe weight of the combustion air intake pipe. Maximum linearpipe length allowed is shown in Table 2. Subtract 5 allowablelinear ft. (1.5m) for every elbow used.The connection for the intake air pipe is at the top of the unit.(See Figure 9.)In addition to air needed for combustion, air shall also besupplied for ventilation, including air required for comfortand proper working conditions for personnel. Refer to theapplicable codes.3.2 VentingWARNINGFailure to use polypropylene CPVC or stainless steelventing for the first 20” (285-600) / 30” (80-210) of ventmaterial or for any part of the venting that is installedinside a closet may lead to property damage, personalinjury or death. The proper length of this material issupplied with boiler. Boilers in the U.S. may use pipeincluded with the boiler.Failure to use the appropriate vent material, installationtechniques, glues/sealants could lead to vent failurecausing property damage, personal injury or death.All 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 this manualand applicable codes may lead to property damage,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 in anapplication where the ambient temperature is elevated,and/or installed in a closet/alcove, polypropylene, CPVCor stainless steel material is required. If the systemtemperatures are unknown at the time of installation,Class IIB or higher venting material is recommended.The NeoTherm is a Category IV appliance and may beinstalled with PVC and CPVC that complies with ANSI/ASTM D1785 F441, polypropylene that complies withULC-S636 Class IIb, or a stainless steel venting system thatcomplies with UL 1738 Standard. (See Table 5.)The unit’s vent can terminate through the roof, or through anoutside wall.When using PVC/CPVC for vent material, venting must beconnected to the CPVC section included with NeoTherm sizes80-850. The CPVC vent section included with the NeoThermmay be broken by CPVC fittings if necessary, but neverreduced in total length. See Table 2 to select the appropriatevent pipe diameter. When using polypropylene, all ventmaterial must be produced by the same manufacturer, andhave a ULC-S636 rating.Figure 10 - Combustion Air and Vent Through RoofINSTALLATION STANDARDSMATERIAL UNITED STATES CANADAStainless Steel UL 1738 Venting must be ULC-S636 certified for use asPVC, sch 40 ANSI/ASTM D1785 venting material. The venting material class must beCPVC, sch 40 ANSI/ASTM F441 chosen based upon the maximum flue gas temperaturePolypropylene ULC-S636 and the intended application of the boiler.Table 5 - Required Exhaust Vent Material**** *** In Canada, refer to CAN/CSA B199.1