Carrier 59CU5A Installation, Start-up, Operating And Service And Maintenance Instructions

59CU5A: Installation, Start-up, Operating and Service and Maintenance InstructionsManufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.9The requirements for combustion and ventilation air depend uponwhether or not the furnace is located in a space having a volume of atleast 50 cubic feet per 1,000 Btuh input rating for all gas appliancesinstalled in the space.• Spaces having less than 50 cubic feet per 1,000 Btuh (4.8 cubic metersper kW) require the Outdoor Combustion Air Method.• Spaces having at least 50 cubic feet per 1,000 Btuh (4.8 cubic metersper kW) may use the Indoor Combustion Air, Standard or Known AirInfiltration Method.Outdoor Combustion Air Method1. Provide the space with sufficient air for proper combustion,ventilation, and dilution of flue gases using permanent horizontal orvertical duct(s) or opening(s) directly communicating with theoutdoors or spaces that freely communicate with the outdoors.2. Provide TWO OUTDOOR OPENINGS, one inlet and one outletcombustion and ventilation air opening, to the outdoors, see Fig. 8.a. One opening MUST commence within 12 in. (300 mm) of theceiling and the second opening MUST commence within 12 in.(300 mm) of the floor.b. Size openings and ducts, see Fig. 8 and Table 3.c. TWO HORIZONTAL DUCTS require 1 sq. in. (645 sq. mm) offree area per 2,000 Btuh (1,100 mm2/kW) of combined input forall gas appliances in the space, see Fig. 8 and Table 3.d. TWO OPENINGS OR VERTICAL DUCTS require 1 sq. in.(645 sq. mm) of free area per 4,000 Btuh (550 mm2/kW) forcombined input of all gas appliances in the space, see Fig. 8 andTable 3.3. ONE OUTDOOR OPENING requires:a. 1 sq. in. (645 sq. mm) of free area per 3,000 Btuh (734 mm2/kW)for combined input of all gas appliances in the space, see Fig. 8and Table 3.b. Not less than the sum of the areas of all vent connectors in thespace.The opening shall commence within 12 in. (300 mm) of the ceiling.Appliances in the space shall have clearances of at least 1 in. (25 mm)from the sides and back and 6 in. (150 mm) from the front. The openingshall directly communicate with the outdoors or shall communicatethrough a vertical or horizontal duct to the outdoors or spaces (crawl orattic) that freely communicate with the outdoors.Indoor Combustion AirE NFPA & AGAStandard and Known-Air-Infiltration Rate MethodsIndoor air is permitted for combustion, ventilation, and dilution, if theStandard or Known-Air-Infiltration Method is used.Standard Method1. The space has no less volume than 50 cubic feet per 1,000 Btuh ofthe maximum input ratings for all gas appliances installed in thespace and2. The air infiltration rate is not known to be less than 0.40 air changesper hour (ACH).The Known Air Infiltration Rate Method shall be used, if the infiltrationrate is known to be:3. Less than 0.40 ACH and4. Equal to or greater than 0.10 ACHInfiltration rates greater than 0.60 ACH shall not be used. The minimumrequired volume of the space varies with the number of ACH and shallbe determined, see Table 4, or Equations 1 and 2. Determine theminimum required volume for each appliance in the space and add thevolumes together to get the total minimum required volume for thespace.Table 4 - Minimum Space Volumes were determined by using thefollowing equations from the current edition of the National Fuel GasCode ANSI Z223.1/NFPA 54, 9.3.2.2:1. For other than fan-assisted appliances, such as a drafthood-equipped water heater:A040022. For fan-assisted appliances such as this furnace:A04003If: Iother = combined input of all other than fan-assisted appliances inBtuh/hrIfan = combined input of all fan-assisted appliances in Btuh/hrACH = air changes per hour (ACH shall not exceed 0.60.)The following requirements apply to the Standard Method and to theKnown Air Infiltration Rate Method.1. Adjoining rooms can be considered part of a space if:a. There are no closeable doors between rooms.b. Combining spaces on same floor level. Each opening shall havefree area of at least 1 in.2/1,000 Btuh (2,000 mm2/kW) of thetotal input rating of all gas appliances in the space, but not lessthan 100 in.2 (0.06 m2). One opening shall commence within 12in. (300 mm) of the ceiling and the second opening shallcommence within 12 in. (300 mm) of the floor. The minimumdimension of air openings shall be at least 3 in. (80 mm), seeFig. 9.c. Combining space on different floor levels. The volumes ofspaces on different floor levels shall be considered ascommunicating spaces if connected by one or more permanentopenings in doors or floors having free area of at least 2in.2/1,000 Btuh (4,400 mm2/kW) of total input rating of all gasappliances.WARNING!CARBON MONOXIDE POISONING HAZARDFailure to follow this warning could result in personal injury or death.The operation of exhaust fans, kitchen ventilation fans, clothes dryers,attic exhaust fans or fireplaces could create a NEGATIVE PRESSURECONDITION at the furnace. Make-up air MUST be provided for theventilation devices, in addition to that required by the furnace. Refer tothe Carbon Monoxide Poisoning Hazard warning in the venting sectionof these instructions to determine if an adequate amount of make-up airis available.WARNING!CARBON MONOXIDE POISONING HAZARDFailure to follow this warning could result in personal injury or death.Many homes require air to be supplied from outdoors for furnacecombustion, ventilation, and dilution of flue gases.The furnace combustion air supply must be provided in accordancewith this instruction manual.Volume Other = 21ft 3ACHI other1000 Btu/hrVolume Fan = 15ft 3ACHI fan1000 Btu/hr