RBI FUTERA XLF Series Installation And Operation Instructions Manual

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F d b b l & h B l M lFinned copper tube gas boilers & water heaters – Boiler Manual5FFAll air from inside the buildingIf the Futera XLF is to be located in a confi ned space, the minimumclearances listed in Table 1, page 4 must be maintained between itand any combustible construction. When installed in a confinedspace without the intake air option (as in Figure 5, page 10 throughFigure 8, page 13) two permanent openings communicating withan additional room(s) are required. The combined volume ofthese spaces must have sufficient volume to meet the criteria for anunconfined space. The total air requirements of all gas utilizationequipment, fireplaces, wood stoves or any type of exhaust fanmust be considered when making this determination. Eachopening must have a minimum free area of 1 in 2 /1000 Btu/hr,2200 mm2/kW based on the total input rating of ALL gas utilizationequipment in the confi ned area. Each opening must be no less than100 in 2 , 64,516 mm 2 in size. The upper opening must be within12 inches, 305 mm of, but not less than 3 inches, 76 mm from, thetop of the enclosure. The bottom opening must be within 12 inches,305 mm of, but not less than 3 inches, 76 mm from, the bottom ofthe enclosure.All air from outside the buildingWhen installed in a confined space without utilizing the intake airoption two permanent openings communicating directly with, orby ducts to, the outdoors or spaces that freely communicate withthe outdoors must be present. The upper opening must be within12 inches, 305 mm of, but not less than 3 inches, 76 mm from, thetop of the enclosure. The bottom opening must be within 12 inches,305 mm of, but not less than 3 inches, 76 mm from, the bottom ofthe enclosure.Where directly communicating with the outdoors or communicatingwith the outdoors through vertical ducts, each opening shall have aminimum free area of 1 in 2/4000 Btu/hr, 550 mm2 /kW of the totalinput rating of all of the equipment in the enclosure.Where communicating with the outdoors through horizontal ducts,each opening shall have a minimum free area of 1 in2 /2000 Btu/hr,1100 mm 2 /kW of the total input rating of all of the equipment inthe enclosure.When ducts are used, they must have the same cross-sectional areaas the free area of the opening to which they connect.When calculating the free area necessary to meet the make-up airrequirements of the enclosure, consideration must be given to theblockage effects of louvers, grills and screens. Screens must have aminimum mesh size of 1/4 inch, 6.4 mm. If the free area through alouver or grill is not known, ducts should be sized per Table 2.Canadian installations must comply with CSA B149.1 when airsupply is provided by natural air fl ow from the outdoors for naturaldraft, partial fan-assisted, fan-assisted, or power draft-assisted burners,there shall be a permanent air supply opening(s) having a cross-sectional area of not less than 1 in 2 per 7,000 Btuh (310 mm 2 perkW) up to and including 1 million Btuh, plus 1 in2 per 14,000 Btuh(155 mm2 per kW) in excess of 1 million Btuh.Table 2 Make-up Air Louver SizingInputMBHRequired cross-sectional areaWire screen¼ inch (6.4 mm)Metal louvers75% free areaWooden louvers25% free areain 2 cm 2 in2 cm2 in2 cm22500 625 4031 833 5382 2500 161273000 750 4838 1000 6452 3000 193543500 875 5645 1167 7522 3500 225814000 1000 6452 1334 8592 4000 25808Intake air option — General guidelinesThis configuration provides combustion air directly to the boiler/water heater’s air intake adapter using a dedicated pipe when usingthe direct vent option. Combustion air can be drawn in horizontallythrough the same outside wall which terminates the exhaust gasesor vertically through the roof, see Figure 1, page 8 through Figure 4,page 9.Common intake air systems may be used provided thecommon duct is sized properly. An intake combustionair damper should be installed if the common ventoption is used in the intake air pipe of each heater.Improper installation can result in excessive levels ofcarbon monoxide which can cause severe personalinjury or death!Table 3 Intake air pipe sizingInputMBHVertical Horizontalin mm in mm2500/3000 10 254 8 2033500/4000 12 305 10 254All joints in metal intake air systems must be secured usingcorrosion resistant fasteners and sealed using a suitable Siliconecaulk . If PVC or CPVC is used, the joints must becleaned with a suitable solvent and connected using a solvent basedPVC cement.The combustion air system MUST be supported by thebuilding structure not the boiler/water heater.A combustion air damper interlocked with the unitshould be installed in the intake air pipe when theinfiltration of subfreezing air could occur, otherwisethe unit could freeze up voiding the warranty!Intake air option – Vertical guidelinesThe maximum equivalent length for the vertical intake air pipe is100 ft, 30.5 m. Each 90o elbow and the intake air terminal are equalto 10 linear ft, 3.0 m of pipe, see Table 3.An approved, nonrestrictive intake air terminal must be used. Theintake air terminal must terminate as shown in Figure 3, page 9. Thepenetration point in the roof must be properly flashed and sealed.