Carrier 58TUA Installation, Start-up, And Operating Instructions Manual

Also see for 58TUA: Service and maintenance instructions User's information manual User's information manual Installation, start-up, and operating instructions Installation, start-up, and operating instructions

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Carrier 58TUA Installation, Start-up, And Operating Instructions Manual Manual pdf 5 page image

The size of the openings depends upon whether the air comes fromoutside of the structure or an unconfined space inside the structure.1. All air from inside the structure:Each opening MUST have at least 1 sq in. of free area per1000 Btuh of the total input for all equipment within theconfined space, but not less than 100 sq in. per opening. (SeeFig. 2.) The minimum dimension of air openings shall be notless than 3 in.For Example:COMBUSTION AIR FROM UNCONFINED SPACE58TUA Furnace High-Fire Input BtuhFree Area per Opening(Sq In.)40,000 10060,000 10080,000 100100,000 100120,000 120133,000 133If the building is constructed unusually tight, a permanent openingdirectly communicating with the outdoors should be provided.This opening shall have a minimum free area of 1 sq in. per 5000Btuh of total input rating for all equipment in the enclosure. (SeeFig. 3.)If the furnace is installed on a raised platform to provide areturn-air plenum, and return air is taken directly from the hallwayor space adjacent to the furnace, all air for combustion must comefrom outdoors.2. All air from outside the structure:a. If combustion air is taken from outdoors through verticalducts, the openings and ducts MUST have at least 1 sq in.of free area per 4000 Btuh of the total input for allequipment within the confined space. (See Fig. 3.)For Example:COMBUSTION AIR FROM OUTDOORS THROUGHVERTICAL DUCTS58TUA FurnaceHigh-FireInput BtuhFree Area per Opening(Sq In.)Round Pipe(In. Dia)40,000 10.0 460,000 15.0 580,000 20.0 6100,000 25.0 6120,000 30.0 7133,000 33.3 7b. If combustion air is taken from the outdoors throughhorizontal ducts, the openings and ducts MUST have atleast 1 sq in. of free area per 2000 Btuh of the total inputfor all equipment within the confined space. (See Fig. 3.)For Example:COMBUSTION AIR FROM OUTDOORS THROUGHHORIZONTAL DUCTS58TUA FurnaceHigh-FireInput BtuhFree Area per Opening(Sq In.)Round Pipe(In. Dia)40,000 20.0 660,000 30.0 780,000 40.0 8100,000 50.0 8120,000 60.0 9133,000 66.5 10When ducts are used, they must be of the same cross-sectional areaas the free area of the openings to which they connect. Theminimum dimension of ducts must not be less than 3 in. (See Fig.3.)Do not install the furnace on its back or sides. Safety controloperation will be adversely affected. Never connect return-airducts to the back of the furnace. A failure to follow thiswarning can cause a fire, personal injury, or death.Step 3—Filter ArrangementThe factory-supplied filter(s) is shipped in the blower compart-ment. Determine location for the filter and move filter retaininghardware, if necessary, before attaching the return-air duct. Afterthe return-air duct has been connected to the furnace, install thefilter(s) inside the furnace blower compartment. See Fig. 4 for sidereturn application and Fig. 5 for bottom return application.A bottom closure panel is factory installed in the bottom of thefurnace. When bottom return inlet is desired, remove and discardthe enclosure panel.Filter retaining brackets, supports, and retainers are factory as-sembled and shipped installed for side return application, with 1set of all required hardware on each furnace. (See Fig. 4.)For bottom return applications, remove the front and back bracketsand supports from each side. The back bracket(s) are installed inthe rear of the furnace casing. Dimples are provided to markmounting screw locations.The front bracket(s) are installed on the bottom front plate, asshown in Fig. 5, once the bottom enclosure has been removed.Rotate filter supports 180° so filter will rest on support andreinstall. Do not reinstall in 17-1/2 in. casing. Install smallU-shaped end of filter retaining rod in the rear bracket and thefront of the filter retainer rod as shown in Fig. 5. Two sets ofhardware are needed for furnaces in 24-1/2 in. casings using 2filters for bottom return. All hardware is provided for filterinstallation.NOTE: Furnaces with a 17-1/2 in. wide casing require anadditional procedure when locating the filter for bottom return-airapplication. Field-fabricate a sheet metal filler strip 1 X 3 X 24-1/2in. and install it along side of the filter as shown in Fig. 5. Drive2 screws through the casing side and into the filler strip to secureit in place. Filter is to rest on top of the filler strip when installed.Fig. 4—Side Filter ArrangementA93045FILTERRETAINERWASHABLEFILTER5