Carrier 48VL Owner's Information Manual

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790STEP 1 STEP 2CLOSESTEP 3OFFONMAINA07797Fig. 7 -- To Shut--off Unit Electric CoolingMaintenance and Care for the Equipment OwnerBefore performing equipment maintenance yourself, pleasecarefully consider the following:FIRE, EXPLOSION, ELECTRICAL SHOCK ANDCUT HAZARDFailure to follow this warning could result in personalinjury, death or property damage.1. Turn off gas supply first, then all electrical power to yourunit and install lock--out tag before servicing or per-forming maintenance.2. When removing access panels or performingmaintenance functions inside your unit, be aware ofsharp sheet metal parts and screws. Although special careis taken to reduce sharp edges to a minimum, beextremely careful when handling parts or reaching intothe unit. Wear safety glasses, gloves, and appropriateprotective clothing.! WARNINGAir FiltersThe air filter(s) should be checked every 3 or 4 weeks andchanged or cleaned whenever it becomes dirty. Dirty filtersproduce excessive stress on the blower motor and can cause themotor to overheat and shut down.This unit must have air filters in place before it can be operated.These filters can be located in one of at least two places. In manyapplications, the installer will provide return air filter grillesmounted on the wall or ceiling of the conditioned structure. In theinstance of filter grilles, the filters can simply be removed from thegrille and replaced.The other typical application is an accessory filter rack installedinside the unit itself. The following information is given to assist inchanging filters used in these internal filter racks.Filter kits are available as a purchased accessory or a factoryinstalled option. The same filter kit is included with the accessoryeconomizers and factory installed economizers.Table 1 – Replacement Filter SizesUnit Size Filter Size24-040/060 2 each 20 x 12 x 1(508 x 305 x 25 mm)30-040/060 2 each 20 x 12 x 1(508 x 305 x 25 mm)36-060/090 2 each 20 x 12 x 1(508 x 305 x 25 mm)42-060/090 1 each 24 x 14 x 1 (610 x 356 x 25 mm),24 x 16 x 1 (610 x 406 x 25 mm)48-090/115/130 1 each 24 x 14 x 1 (610 x 356 x 25 mm),24 x 16 x 1 (610 x 406 x 25 mm)60-090/115/130* 1 each 24 x 16 x 1 (610 x 406 x 25 mm),24 x 18 x 1 (610 x 457 x 25 mm)*Units with bent indoor coil.To replace or inspect filters in accessory filter rack (See Fig. 2):1. Remove the filter access panel using a 5/16--in. nut driver.2. Remove the filter(s) by pulling it out of the unit. If thefilter(s) is dirty, clean or replace with a new one.When installing the new filter(s), note the direction of the airflowarrows on the filter frame which should be pointing at the indoorcoil.3. Reinstall filter access panel ensuring opening is air andwater tight.If you have difficulty locating your air filter(s) or have questionsconcerning proper filter maintenance, contact your dealer forinstructions. When replacing filters, always use the same size andtype of filter that was supplied originally by the installer. See Table1 for filter sizes supplied with accessory filter rack.Replacing or inspecting filters in units with econom-izersSmall Chassis (See Fig. 8)1. Remove return air duct cover at rear of unit using a 5/16--in.nut driver.2. Remove the filter(s) by pulling it out and through the unitduct opening. If filter is dirty, replace both filters with newones.When installing the new filters, note the direction of the airflowarrows on the filter frame, which should be pointing at the indoorcoil.3. Reinstall duct cover ensuring opening is air and watertight.Large Chassis (See Fig. 9)1. Remove filter access door using a 5/16--in. nut driver.2. Remove the filter(s) by pulling it out and through the unitfilter access door. If filter is dirty, replace both filters withnew ones.Units with bent indoor coils, install 24 x 18 x 1 (610 x 457 x 25mm) filter first and then install 24 x 16 x 1 (610 x 406 x 25) filter.When installing the new filters, note the direction of the airflowarrows on the filter frame, which should be pointing at the indoorcoil.3. Reinstall filter access door ensuring opening is air and watertight.UNIT OPERATION HAZARDFailure to follow this caution may result in propertydamage.Never operate your unit without filters in place. Anaccumulation of dust and lint on internal parts of your unitcan cause loss of efficiency and blower motor and/orcompressor damage.! CAUTION

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