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

Also see for 58UHV Series: Installation, start-up, and operating instructions User's information manual Installation, start-up, and operating instructions Installation, start-up, and operating instructions

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

The operation of exhaust fans, kitchen ventilation fans,clothes dryers, or fireplaces could create a NEGATIVE AIRPRESSURE CONDITION at the furnace. Make-up air MUSTBE PROVIDED for these devices, in addition to that requiredby the furnace.Combustion and ventilation air requirements are determined bywhether the furnace is located in a CONFINED or UNCONFINEDspace.UNCONFINED SPACEAn unconfined space has volume of at least 50 cu ft for each 1000Btuh of total input for all appliances (such as furnaces, clothesdryers, water heaters, etc.) in the space.For Example:58UHV AND 58UXV FURNACESHIGH-STAGE INPUT BTUHMINIMUM SQ FT WITH7-1/2 FT CEILING60,000 40080,000 534100,000 667117,000 780If the unconfined space is of unusually tight construction, air forcombustion and ventilation MUST come from either the outdoorsor spaces freely communicating with the outdoors. Combustionand ventilation openings must be sized the same as for a confinedspace as defined below. Return air must not be taken from theroom unless an equal or greater amount of air is supplied to theroom.CONFINED SPACEA confined space is defined as a space whose volume is less than50 cu ft per 1000 Btuh of total input ratings of all appliancesinstalled in that space. A confined space MUST have provisionsfor supplying air for combustion, ventilation, and dilution of fluegases using 1 of the following methods. (See Fig. 3 or 4, and Table2.)NOTE: In determining free area of an opening, the blockingeffect of louvers, grilles, and screens must be considered. If freearea of louver or grille design is unknown, assume that woodlouvers have a 20 percent free area and metal louvers or grilleshave a 60 percent free area. Screens, when used, must not besmaller than 1/4-in. mesh. Louvers and grilles must be constructedso they cannot be closed.The size of the openings depends upon whether air comes fromoutside of the structure or an unconfined space inside the structure.1. All air from inside the structure requires 2 openings (forstructures not usually tight):a. Each opening MUST have at least 1 sq in. of free area per1000 Btuh of total input for all equipment within theconfined space, but not less than 100 sq in. per opening.(See Fig. 3 and Table 2.) The minimum dimension of airopenings shall not be less than 3 in.b. If building is constructed unusually tight, a permanentopening directly communicating with the outdoors shall beprovided. (See item 2 below.)c. If furnace is installed to obtain a return-air directly fromhallway or space adjacent to furnace, all air for combustionmust come from outdoors.Fig. 3—Confined Space: Air for Combustion andVentilation from an Indoor Unconfined SpaceA89012SUPPLYAIR6″ MIN(FRONT) †RETURN AIRVENT THROUGH ROOF1 SQ IN.PER 1000BTUH* IN DOOROR WALL12″ MAX1 SQ IN.PER 1000BTUH* IN DOOROR WALL12″ MAXINTERIORHEATEDSPACE* Minimum opening size is 100 sq in. withminimum dimensions of 3 in.† Minimum of 3 in. when type-B1 vent is used.UNCONFINEDSPACECONFINEDSPACEFig. 4—Confined Space: Air for Combustion andVentilation from OutdoorsA890131 SQ IN.PER4000BTUH*DUCTSTOOUTDOORS1 SQ IN.PER 4000BTUH*SUPPLYAIRVENTTHROUGHROOFDBACE1 SQ IN.PER 4000BTUH*DUCTTOOUTDOORSRETURN AIR1 SQ IN.PER 2000BTUH*1 SQ IN.PER 2000BTUH*DUCTSTOOUTDOORS12″ MAX12″ MAX12″ MAXUse any of the followingcombinations of openings:A & B C & D D & E F & GNOTE:*Minimum dimensions of 3 in.CONFINEDSPACE12″MAX12″MAXOUTDOORS1 SQ IN.PER4000BTUH*FG5