Carrier 50ZHK Owner's Information Manual

Also see for 024-036: Service manual

50ZHK: Owner’s Information ManualManufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.3Demand Defrost ModeThe defrost mode is factory set to an initial 60-minute time interval. Itmay also be adjusted to an initial interval of 30, 90, or 120 minutes.During operation, the control optimizes current defrost time based on theprevious defrost interval and previous defrost period. If the previousdefrost period is less than 2 minutes for two consecutive defrost cyclesthe control will lengthen the defrost interval by 15 minutes, up to amaximum of 120 minutes or 30 minutes greater than the originalsetpoint, whichever comes first. If the previous defrost period is morethan 5 minutes for two consecutive defrost cycles the control willshorten the defrost interval by 15 minutes, down to a minimum of 30minutes or 30 minutes from the original setpoint, whichever is first.After the defrost condition is satisfied, or after a maximum of 10 minutesin defrost mode, the unit will resume normal heating operation.Emergency Heating ModeIn the event of primary unit heat failure, the emergency heat modeallows your supplemental heating source to keep your home or officewarm until your unit can be serviced. Contact your dealer in the event ofprimary unit heat failure.During Emergency Heat, your thermostat will lockout the heat pump andturn on the supplemental heat, if equipped. You may notice the indoorfan increase its speed.Maintenance and ServiceThis section discusses maintenance that should be performed by yourdealer and care you, as the owner, may wish to handle for your 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 air must notbe obstructed from reaching the unit. Clearance from the top of the unitis 48 in. (1219 mm). Clearance of at least 36 in. (914 mm) is required onsides except the power entry side (42 in. [1067 mm] clearance).Maintenance and Care for the Equipment OwnerBefore proceeding with those things you might want to maintainyourself, please carefully consider the following:Air FiltersThe air filter(s) should be checked every 3 or 4 weeks and changed orcleaned whenever it becomes dirty. Dirty filters produce excessive stresson the blower motor and can cause the motor to overheat and shut down.This unit must have an air filter in place before it can be operated. Thesefilters should be located in at least one of two places. In manyapplications, the installer will provide return air filter grilles mounted onthe wall or ceiling of the conditioned structure. In the instance of filtergrilles, the filters can simply be removed from the grille and replaced.Table 1 indicates the correct indoor filter size for your unit.When installing the new filter(s), note the direction of the airflow arrowson 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 and type offilter that was supplied originally by the installer.Fans and Fan MotorPeriodically check the condition of fan wheels and housings andfan-motor shaft bearings. Contact your dealer for the required annualmaintenance.Indoor and Outdoor CoilsCleaning of the coils should only be done by qualified service personnel.Contact your dealer for the required annual maintenance.Condensate DrainThe drain pan and condensate drain line should be checked and cleanedat the same time the cooling coils are checked by your dealer.CompressorAll compressors are hermetically sealed and do not require periodicmaintenance.Condenser FanThe fan must be kept free of all obstructions to ensure proper cooling.Contact your dealer for any required service.Electrical Controls and WiringElectrical controls are difficult to check without proper instrumentation.If there are any discrepancies in the operating cycle, contact your localdealer and request service.Refrigerant CircuitThe refrigerant circuit is difficult to check for leaks without the properequipment. If inadequate cooling is suspected, contact your local dealerfor service.WARNING!FIRE, EXPLOSION, ELECTRICAL SHOCK, CUTHAZARDFailure to follow this warning could result in personal injury, death orproperty damage.1. TURN OFF ELECTRICAL POWER TO YOUR UNITBEFORE SERVICING OR PERFORMING MAINTENANCEAND INSTALL A LOCK-OUT TAG.2. When removing access panels or performing maintenancefunctions inside your unit, be aware of sharp sheet metal partsand screws. Although special care is taken to reduce sharpedges to a minimum, be extremely careful when handling partsor reaching into the unit.Table 1 – Indoor Air Filter DataUnit Size Filter Size024 20x20x1 (508x508x25 mm)030-036 24x30x1 (610x762x25 mm)042-060 24x36x1 (610x914x25 mm)WARNING!FIRE AND UNIT OPERATION HAZARDFailure to follow this warning could result in personal injury, death orproperty damage.Never operate your unit without filters in place. An accumulation ofdust and lint on internal parts of your unit can cause loss of efficiency.WARNING!PERSONAL INJURY AND UNIT DAMAGE HAZARDFailure to follow this warning could result in personal injury, death orproperty damage.Do not poke sticks, screwdrivers, or any other object into revolving fanblades.

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