York TM8V C Series Installation Manual

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York TM8V C Series Installation Manual Manual pdf 21 page image

5402847-UIM-A-0917Johnson Controls Unitary Products 21Air Supply Openings and Ducts1. An opening may be used in lieu of a duct to provide the outside airsupply to an appliance unless otherwise permitted by the authorityhaving jurisdiction. The opening shall be located within 12” (30.5cm) horizontally from, the burner level of the appliance. Refer to“COMBUSTION AIR SOURCE FROM OUTDOORS and VENTAND SUPPLY AIR SAFETY CHECK” in these instructions for addi-tional information and safety check procedure.2. The duct shall be either metal, or a material meeting the class 1requirements of CAN4-S110 Standard for Air Ducts.3. The duct shall be least the same cross-sectional area as the freearea of the air supply inlet opening to which it connects.4. The duct shall terminate within 12 in (30.5 cm) above, and within 24in (61 cm) horizontally from, the burner level of the appliance hav-ing the largest input.5. A square or rectangular shaped duct shall only be used when therequired free area of the supply opening is 9 in 2 (58.06 cm2 ) orlarger. When a square or rectangular duct is used, its small dimen-sion shall not be less than 3 in (7.6 cm).6. An air inlet supply from outdoors shall be equipped with a means toprevent the direct entry of rain and wind. Such means shall notreduce the required free area of the air supply opening.7. An air supply inlet opening from the outdoors shall be located notless than 12” (30.5 cm) above the outside grade level.Combustion Air Source from Outdoors1. Two permanent openings, one within 12 in (30.5 mm) of the top andone within 12 in (30.5 mm) of bottom of the confined space, Twopermanent openings, shall communicate directly or by means ofducts with the outdoors, crawl spaces or attic spaces.2. One permanent openings, commencing within 12 in (30.5 mm) ofthe top of the enclosure shall be permitted where the equipmenthas clearances of at least 1 in (2.54 cm) from the sides and backand 6 in (15.24 cm) from the front of the appliance. The openingshall communicate directly with the outdoors and shall have a mini-mum free area of:a. 1 square in per 3000 Btu per hour (7.3 cm 2 per kW) of the totalinput rating of all equipment located in the enclosure.b. Not less than the sum of all vent connectors in the confinedspace.3. The duct shall be least the same cross-sectional area as the freearea of the air supply inlet opening to which it connects.4. The blocking effects of louvers, grilles and screens must be givenconsideration in calculating free area. If the free area of a specificlouver or grille is not known. Refer to Table 8 to estimate free area.Ventilated Combustion AirThe ventilated attic space or a crawl space from which the combustionair is taken must comply with the requirements specified in “AIRSOURCE FROM OUTDOORS” in this instruction or in Section 5.3, Airfor Combustion and Ventilation of the National Fuel Gas Code, ANSIZ223.1 (latest edition). This type installation requires two properly sizedpipes. One brings combustion air from a properly ventilated attic spaceor crawl space and a second pipe that extends from the furnace ventconnection (top right of unit) to the exterior of the building.Vent and Supply (Outside) Air Safety Check ProcedureFor Category I furnaces, vent installations shall be in accordance withParts 7 and 11 of the National Fuel Gas Code, ANSI Z223.1/NFPA 54,and or Section 7 and Appendix B of the CSA B149.1, Natural Gas andPropane Installation Codes, the local building codes, furnace and ventmanufacturer's instructions.Multi-story or common venting systems are permitted and must beinstalled in accordance with the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and / or the CSA B149.1, Natural Gas and Propane Installa-tion Codes, local codes, and the manufacturer's instructions.Vent connectors serving Category I furnaces shall not be connectedinto any portion of mechanical draft systems operating under positivepressure.Horizontal portions of the venting system shall be supported to preventsagging using hangers or perforated straps and must slope upwardsnot less than 1/4” per foot (0.635 cm/m) from the furnace to the vent ter-minal.It is recommended that you follow the venting safety procedure below.This procedure is designed to detect an inadequate ventilation systemthat can cause the appliances in the area to operate improperly causingunsafe levels of Carbon Monoxide or an unsafe condition to occur.FIGURE 27: Outside and Ambient Combustion AirGableVentGasVentSoffitVentVentilatedAtticTop AboveInsulationOptionalInlet (a)OutletAir (a)VentilatedCrawl SpaceGasWaterHeaterFurnaceSoffitVentGasWaterHeater InletAir (a)InletAir (b)FurnaceGasVentOutletAir (a)OutletAir (b)InletAir (a)InletAir (b)GasWaterHeaterFurnaceVentilatedAtticTop AboveInsulationGableVentGasVent