York TM8V C Series Installation Manual

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York TM8V C Series Installation Manual Manual pdf 20 page image

5402847-UIM-A-091720 Johnson Controls Unitary ProductsFAN-ASSISTED COMBUSTION SYSTEMThis appliance is equipped with an integral mechanical means to eitherdraw products of combustion through the heat exchanger.Ambient Combustion Air SupplyThis type installation will draw the air required for combustion fromwithin the space surrounding the appliance and from areas or roomsadjacent to the space surrounding the appliance. This may be fromwithin the space in a non-confined location or it may be brought into thefurnace area from outdoors through permanent openings or ducts. Asingle, properly sized pipe from the furnace vent connector to the out-doors must be provided. Combustion air is brought into the furnacethrough the unit top panel opening.An unconfined space is not less than 50 cu.ft (1.42 m3 ) per 1,000 Btu/hr (0.2928 kW) input rating for all of the appliances installed in thatarea.Rooms communicating directly with the space containing the appli-ances are considered part of the unconfined space, if doors are fur-nished with openings or louvers.A confined space is an area with less than 50 cu.ft (1.42 m3 ) per 1,000Btu/hr (0.2928 kW) input rating for all of the appliances installed in thatarea. The following must be considered to obtain proper air for combus-tion and ventilation in confined spaces.Combustion Air Source From OutdoorsThe blocking effects of louvers, grilles and screens must be given con-sideration in calculating free area. If the free area of a specific louver orgrille is not known, refer to Table 8, to estimate free area.* Do not use less than 1/4”(0.635 cm) mesh+ Free area of louvers and grille varies widely; the installer should followlouver or grille manufacturer’s instructions.Dampers, Louvers and Grilles (Canada Only)1. The free area of a supply air opening shall be calculated by sub-tracting the blockage area of all fixed louvers grilles or screens fromthe gross area of the opening.2. Apertures in a fixed louver, a grille, or screen shall have no dimen-sion smaller than 0.25” (0.64 cm).3. A manually operated damper or manually adjustable louvers arenot permitted for use.4. A automatically operated damper or automatically adjustable lou-vers shall be interlocked so that the main burner cannot operateunless either the damper or the louver is in the fully open position.FIGURE 26: Combustion Airflow Path Through The Furnace Casing tothe Burner CompartmentWARNINGThis type of installation requires that the supply air to the appliance(s)be of a sufficient amount to support all of the appliance(s) in the area.Operation of a mechanical exhaust, such as an exhaust fan, kitchenventilation system, clothes dryer or fireplace may create conditionsrequiring special attention to avoid unsatisfactory operation of gasappliances. A venting problem or a lack of supply air will result in ahazardous condition, which can cause the appliance to soot and gen-erate dangerous levels of CARBON MONOXIDE, which can lead toserious injury, property damage and / or death.Combustion Air!Table 8: Estimated Free AreaWood or MetalLouvers or GrillesWood 20-25%*Metal 60-70% *Screens+ 1/4” (0.635 cm)mesh or larger 100%WARNINGWhen a Category I furnace is removed or replaced, the original vent-ing system may no longer be correctly sized to properly vent theattached appliances.An improperly sized vent system can cause CARBON MONOXIDE tospill into the living space causing personal injury, and or death.Table 9: Unconfined Space Minimum AreaBTUH Input Rating Minimum Free AreaRequired for Each Opening60,000 60 in2 (387 cm 2 )80,000 80 in2 (516 cm 2 )100,000 100 in 2 (645 cm 2 )120,000 120 in 2 (742 cm 2 )Table 10: Free AreaBTUH InputRatingMinimum Free Area Required for Each OpeningHorizontal Duct(2,000 BTUH)Vertical Duct orOpening to Outside(4,000 BTUH)Round Duct(4,000 BTUH)60,000 30 in2 (193 cm 2 ) 15 in 2 (97 cm 2) 5” (13 cm)80,000 40 in2 (258 cm 2 ) 20 in2 (129 cm 2 ) 5” (13 cm)100,000 50 in2 (322 cm 2 ) 25 in2 (161 cm 2 ) 6” (15 cm)120,000 60 in2 (387 cm 2 ) 30 in2 (193 cm 2 ) 7” (18 cm)EXAMPLE: Determining Free Area.Appliance 1 Appliance 2 Total Input100,000 + 30,000 = (130,000  4,000) = 32.5 Sq. In. VerticalAppliance 1 Appliance 2 Total Input100,000 + 30,000 = (130,000  2,000) = 65 Sq. In. Horizontal!