Carrier 50VT-B Owner's Information Manual

Also see for 50VT-B: Installation instructions

3amount of heat absorbed from the outside air. So, to maintainenergy--efficient operation, your unit has an automatic defrostmode.The defrost mode starts at a preset time interval of 60 minutes,although, it may be reset to 30, 90 or 120 minutes. Defrost willstart at the preset time only if the ice is sufficient to interfere withnormal heating operation.After the ice is melted from the coil, or after a maximum of 10minutes in defrost mode, the unit automatically switches back tonormal heating operation.Do not be alarmed if steam or fog appears at the outdoor unitduring defrost mode. Water vapor from the melting ice maycondense into a mist in the cold outside air.During certain weather conditions such as heavy snow and freezingrain it is not uncommon for ice to build up on the unit grille. Thisis normal for these weather conditions. Do not attempt to removethe ice from the unit grille. This condition will not affect the properfunction of the unit and will clear within a few days.Emergency Heating ModeIn the event of primary unit heat failure, the emergency heat modeallows your supplemental heating source to keep your home oroffice warm until your unit can be serviced. Contact your dealer inthe event of primary unit heat failure.MAINTENANCE AND SERVICEThis section discusses maintenance that should be performed byyour dealer and care you, as the owner, may wish to handle foryour new unit.Routine MaintenanceAll routine maintenance should be handled by skilled, experiencedpersonnel. Your dealer can help you establish a standard procedure.To assure proper functioning of the unit, flow of condenser airmust not be obstructed from reaching the unit. Clearance from thetop of the unit is 48 in. (1219 mm). Clearance of at least 36 in.(914 mm) is required on sides except the power entry side (42 in.[1067 mm] clearance) and the duct side (12 in. [305 mm]minimum clearance).Maintenance and Care for the Equipment OwnerBefore proceeding with those things you might want to maintainyourself, please carefully consider the following:FIRE, EXPLOSION, ELECTRICAL SHOCK, CUTHAZARDFailure to follow this warning could result in personalinjury, death or property damage.1. TURN OFF ELECTRICAL POWER TO YOUR UNITBEFORE SERVICING OR PERFORMINGMAINTENANCE AND INSTALL A LOCK--OUTTAG. THERE MAY BE MORE THAN ONE DISCON-NECT SWITCH.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.! WARNINGAir FiltersThe air filter(s) should be checked every 3 or 4 weeks and changedor cleaned whenever it becomes dirty. Dirty filters produceexcessive stress on the blower motor and can cause the motor tooverheat and shut down.This unit must have an air filter in place before it can be operated.These filters should be located in at least one of two places. Inmany applications, 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 Sizes50EZ Unit Size Filter Size24 2 each 20 x 12 x 1(508 x 305 x 25 mm)30--- 36 2 each 20 x 12 x 1(508 x 305 x 25 mm)42-48 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* 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.50VT Unit Size Filter Size24 2 each 20 x 12 x 1(508 x 305 x 25 mm)30 2 each 20 x 12 x 1(508 x 305 x 25 mm)36-42 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--- 60* 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:1. Remove the filter access panel (See Fig. 3) 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.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.Access PanelsFilter Access PanelFor Accessory Filter RackA09044Fig. 2 -- Accessory Filter Rack Access Panel

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