Carrier 58CTA Installation And Service Instructions Manual

Also see for 58CTA: Product data Installation, start-up, operating and service and maintenance instructions

Carrier 58CTA Installation And Service Instructions Manual Manual pdf 12 page image

If:Iother = combined input of all other than fan-assisted appli-ances in Btu/hrIfan = combined input of all fan-assisted appliances in Btu/hrACH = air changes per hour (ACH shall not exceed 0.60.)The following requirements apply to the Standard Method and tothe Known Air Infiltration Rate Method.1. Adjoining rooms can be considered part of a space if:a. There are no closable doors between rooms.b. Combining spaces on same floor level. Each opening shallhave free area of at least 1 in. 2/1,000 Btuh (2,000 mm 2/kW)of the total input rating of all gas appliances in the space,but not less than 100 in.2 (0.06 m2). One opening shallcommence within 12″ (300 mm) of the ceiling and thesecond opening shall commence within 12″ (300 mm) ofthe floor. The minimum dimension of air openings shall beat least 3 in. (80 mm). (See Fig. 8.)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 perma-nent openings in doors or floors having free area of at least2 in. 2/1,000 Btuh (4,400 mm2/kW) of total input rating ofall gas appliances.2. An attic or crawlspace may be considered a space that freelycommunicates with the outdoors provided there are adequatepermanent ventilation openings directly to outdoors havingfree area of at least 1-in.2/4,000 Btuh of total input rating forall gas appliances in the space.3. In spaces that use the Indoor Combustion Air Method,infiltration should be adequate to provide air for combustion,permanent ventilation and dilution of flue gases. However, inbuildings with unusually tight construction, additional airMUST be provided using the methods described in theOutdoor Combustion Air Method section.Unusually tight construction is defined asConstruction with:a. Walls and ceilings exposed to the outdoors have a continu-ous, sealed vapor barrier. Openings are gasketed or sealedandb. Doors and openable windows are weatherstripped andc. Other openings are caulked or sealed. These include jointsaround window and door frames, between sole plates andfloors, between wall-ceiling joints, between wall panels, atpenetrations for plumbing, electrical and gas lines, etc.Combination of Indoor and Outdoor Air1. Indoor openings shall compy with the Indoor CombustionAir Method below and,2. Outdoor openings shall be located as required in the OutdoorCombustion Air Method mentioned previously and,3. Outdoor openings shall be sized as follows:a. Calculate the Ratio of all Indoor Space volume divided byrequired volume for Indoor Combustion Air Methodbelow.b. Outdoor opening size reduction Factor is 1 minus theRatio in a. above.c. Minimum size of Outdoor openings shall be the sizerequired in Outdoor Combustion Air Method abovemultiplied by reduction Factor in b. above. The minimumdimension of air openings shall be not less than 3 in. (80mm).INSTALLATIONUPFLOW INSTALLATIONBottom Return Air InletThese furnaces are shipped with bottom closure panel installed inbottom return-air opening. Remove and discard this panel whenbottom return air is used. To remove bottom closure panel,perform the following:1. Tilt or raise furnace and remove 2 screws holding bottom fillerpanel. (See Fig. 9.)2. Rotate bottom filler panel downward to release holding tabs.3. Remove bottom closure panel.4. Reinstall bottom filler panel and screws.Side Return Air InletThese furnaces are shipped with bottom closure panel installed inbottom return-air opening. This panel MUST be in place whenonly side return air is used.NOTE: Side return-air openings can be used in UPFLOW andmost HORIZONTAL configurations. Do not use side return-airopenings in DOWNFLOW configuration.Leveling Legs (If Desired)In upflow position with side return inlet(s), leveling legs may beused. (See Fig. 10.) Install field-supplied, 5/16 X 1-1/2 in. (max)corrosion-resistant machine bolts, washers and nuts.NOTE: Bottom closure must be used when leveling legs are used.It may be necessary to remove and reinstall bottom closure panelto install leveling legs. To remove bottom closure panel, see item1 in Bottom Return Air Inlet section in Step 1 above.To install leveling legs:1. Position furnace on its back. Locate and drill a hole in eachbottom corner of furnace. (See Fig. 10.)2. For each leg, install nut on bolt and then install bolt and nut inhole. (Install flat washer if desired.)3. Install another nut on other side of furnace base. (Install flatwasher if desired.)4. Adjust outside nut to provide desired height, and tighten insidenut to secure arrangement.5. Reinstall bottom closure panel if removed.Fig. 9—Removing Bottom Closure PanelA0209810→→