ACV Marquis TWH200LP Installation Manual

ACV Marquis TWH200LP Installation Manual Manual pdf 14 page image

Vent / Combustion Air Installation11Category IV Vent Guidelines1. Vent system installation must be in accordance with Localcodes or, in the absence of local codes, the National FuelGas Code, ANSI Z223.1 / NFPA 54 and/or CSA B149.1,Natural Gas and Propane Installation Code.2. Do not install venting system components on theexterior of building except as specifically required bythese instructions- Vent terminals must be at least 4 feet from anydoor, window, or gravity inlet into the building.- The bottom of the vent terminal must be at least12˝ above the normal snow line. In no caseshould it be less than 12˝ above grade level.- Do not install the vent terminal directly over win-dows or doors.- For sidewall venting, the minimum horizontaldistance between any adjacent water heatervent terminations is twelve (12) inches. It is bet-ter to be far more than 12 inches for avoidingfrost damage to building surfaces where ventterminations are placed.The Category IV vent termination must also maintain thefollowing clearances; as shown below.a. At least 3 feet [0.9 m] from adjacent wallsb. At least 3 feet [0.9 m] below roof over hangsc. At least 7 feet [2.1 m] above any public walkwaysd. At least 3 feet [0.9 m] above any forced air intakewithin 10 feet [3 m].e. No closer than 4 feet [1.2 m] below or horizon-tally from any door or window or gravity air inlet.Maximum Allowable Vent Lengths (PVC, CPVC, PP)Note:Reduce maximum allowable length:• 5 feet (1.5 M) for each additional 3-inch 90degree elbow• 2.5 feet (0.75 M) for each additional 3-inch 45degree elbow• 8 feet (2.4 M) for each additional 2-inch 90degree elbow• 4 feet (1.2 M) for each additional 2-inch 45degree elbow• The thickness of the wall vents installed:Min 4” ~ Max 20”Vent Termination1. Bird Screen Installation• Install Bird Screen at Vent Terminal• After connecting vent/air inlet terminal, it isrequired to install screen for the terminal to pre-vent blockage, which might cause damage tothe unit.Termination Clearancesof Category IV SystemTWH200/TWH200LPMaximumLengthMaximumElbows2” Combustion Air /Vent Pipe 50’ (15 M) 43” Combustion Air /Vent Pipe 100’ (30 M) 6