RBI Futera XLF Series Manual

RBI Futera XLF Series Manual Manual pdf 7 page image

7Finned copper tube gas boilers & water heaters – Boiler manualFTXLF-IOM-HN-1-110308 Copyright 2008 Mestek, Inc.option 3 — side Wall Vent, positive pressure3.category iV (individual venting only) (page 11)Combustion air is obtained from the space in which the unit isinstalled. Vent system is certified to UL 1738 for installationsin the United States, ULC S636 for installations in Canada.Maximum equivalent length of vent and air piping must notexceed 100 feet each.To ensure proper boiler operation, boilers that useroom air must not be fired at less than 33 % input. Thisapplies to OPTION 3 and OPTION 4 venting.option 4 — Vertical Vent, negative pressure4.category ii (common venting) (page 12)Requires negative pressure in vent (natural draft). Requires ametal chimney system approved for Category II venting. Thismethod is required if common venting multiple XLF boilers.All venting and combustion air material supplied byinstaller. All venting materials must be approved for theapplication. Consult the vent manufacturer’s productliterature.Category IV venting — vent pipe sizetable 4(Vent options 1, 2 or 3)InputMBHPipe diameterin mm3000 8 2034000 10 254option 1: Direct VentpositiVe pressUre — cAteGory iVHorizontAL or VerticALIn this configuration the boiler/water heater blower is usedto push the flue products to the outdoors while draw-ing combustion air from the outdoors. The Intake AirOption instructions under the “Combustion air & ventilation” sec-tion must be followed! The vent system must be sized per Table 4.Horizontal direct vent systemsFigures 1 & 2The vent materials used in horizontal vent systems mustbe certified to UL 1738 for installations in the United States, ULCS636 for installations in Canada. The certified vent terminal fromRBI must also be used.The maximum equivalent length for the horizontal vent pipe is 100 ft,30.5 m. Each 90o elbow and the vent terminal are equal to 10 linearft, 3.0 m of pipe. If any part of a single wall metal vent system passesthrough an unheated space, it must be insulated with insulation ratedfor 400 o F, 204 o C. Structural penetrations must be made using ap-proved fire-stops. For best results, horizontal vent systems should beas short and straight as possible.The vent system must be both gas tight and water-tight. All seams andjoints in metal pipes must be joined and sealed in accordance withthe vent system manufacturer’s instructions.When horizontal vent runs exceed 5 ft, 1.5 m they must be supportedat 3 ft, 0.9 m intervals with overhead hangers. The vent system mustbe pitched down, toward the vent terminal, 1/4 in/ft, 20 mm/m. Ifany part of a single wall metal vent system passes through an unheatedspace it must be insulated with insulation rated for 400 oF, 204o C.Horizontal vent systems shall terminate at least 4 ft, 1.2 m below, 4 ft,1.2 m horizontally from or 1 ft, 0.30 m above any door, window orgravity air inlet into any building.It must not terminate less than 4 ft, 1.2 m horizontally from, and in nocase above or below, unless a 4 ft, 1.2 m horizontal distance is main-tained, from electric meters, gas meters, regulators and relief equip-ment; and not less than 7 ft, 2.1 m above adjacent public walkway.Canadian installations require a minimum of 6 ft,18.3 m clearance from electric meters, gas meters,regulators and relief equipment for compliance withCAN B149.1.The bottom of the vent terminal(s) shall be located at least 5 ft, 1.5 mabove the air intake terminal(s) unless there is a minimum 5 ft, 1.5 mhorizontal separation between them.Avoid terminal locations likely to be affected by winds, snowdrifts,people and pets. Protect building materials and vegetation from deg-radation caused by the flue gases.Vertical direct vent systemsFigure 3 (vent/air pipe equivalent lengths up to100 feet maximum)If any part of a single wall metal vent system passes through an unheat-ed space, it must be insulated with insulation rated for 400oF, 204o C.Structural penetrations must be made using approved fire-stops.An approved, nonrestrictive vent terminal must be used. The top of avertical vent system must extend at least 51/2 ft, 1.7 m above the roofsurface and maximum snow line that it passes through, 4 ft, 1.2 mabove the intake air terminal, see Figure 3.In addition the vent system must conform to the dimensions shownin Figure 3, page 9. The penetration point in the roof must be properlyflashed and sealed.The vent system must be gas tight. All seams and joints in metal pipesmust be joined and sealed in accordance with the vent system manu-facturer’s instructions.combination direct vent systemsFigure 4 (vent/air pipe equivalent lengths up to100 feet maximum)The boiler/water heater can be vented vertically with the in-take air piped horizontally through an outside wall. Followthe instructions in the Intake Air Option — HorizontalGuidelines on page 6. Also follow the general instructionsin the “Combustion Air & Ventilation” and “General Venting Guide-lines” sections.