Carrier 58PHA/PHX Installation, start-up, operating and Installation And Operating Instructions Manual

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Carrier 58PHA/PHX Installation, start-up, operating and Installation And Operating Instructions Manual Manual pdf 10 page image

10of at least 2 in.2 /1,000 Btuh (4,400 mm 2 /kW) of totalinput rating of all gas appliances.2. An attic or crawlspace may be considered a space thatfreely communicates with the outdoors provided there areadequate permanent ventilation openings directly tooutdoors having free area of at least 1--in.2/4,000 Btuh oftotal 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 forcombustion, permanent ventilation and dilution of fluegases. However, in buildings with unusually tightconstruction, additional air MUST be provided using themethods described in the Outdoor Combustion AirMethod section.Unusually tight construction is defined as construction with:a. Walls and ceilings exposed to the outdoors have acontinuous, sealed vapor barrier. Openings are gasketedor sealed andCIRCULATING AIRDUCTS6" MIN(FRONT)ÜCIRCULATING AIR DUCTSVENT THROUGH ROOF1 SQ IN.PER 1000BTUH* IN DOOROR WALL12" MAX1 SQ IN.PER 1000BTUH* IN DOOROR WALL12" MAXUNCONFINEDSPACEINTERIORHEATEDSPACECLEARANCE IN FRONT OF COMBUSTION AIROPENINGS SHALL BE AT LEAST 3 IN.(305mm)(152mm)(305mm)*Minimum opening size is 100 in. 2 with minimum dimensions of 3 in. (76mm).*Minimum of 3 in. (76 mm), when type ---B1 vent is used.A03175Fig. 8 -- Air for Combustion, Ventilation, and Dilution fromIndoorsb. Doors and openable windows are weatherstripped andc. Other openings are caulked or sealed. These includejoints around window and door frames, between soleplates and floors, between wall--ceiling joints, betweenwall panels, at penetrations for plumbing, electrical andgas lines, etc.Combination of Indoor and Outdoor Air1. Indoor openings shall comply with the IndoorCombustion Air Method below and,2. Outdoor openings shall be located as required in theOutdoor Combustion Air Method menioned previouslyand,3. Outdoor openings shall be sized as follows:a. Calculate the Ratio of all Indoor Space volume dividedby required volume for Indoor Combustion AirMethod below.A02098Fig. 9 -- Removing Bottom Closure Panelb. 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 two screws holdingbottom filler panel. (See Fig. 9.)2. Rotate bottom filler panel downward to release holdingtabs.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. (8 x38 mm) (max) corrosion--resistant machine bolts, washers andnuts.NOTE: Bottom closure must be used when leveling legs areused. It may be necessary to remove and reinstall bottom closurepanel to install leveling legs. To remove bottom closure panel, seeItem 1. in Bottom Return Air Inlet section.To install leveling legs:1. Position furnace on its back. Locate and drill a hole ineach bottom corner of furnace. (See Fig. 10.)2. For each leg, install nut on bolt and then install bolt andnut in hole. (Install flat washer if desired.)3. Install another nut on other side of furnace base. (Installflat washer if desired.)58PHA