Carrier 50TC*17 Series Service And Maintenance Instructions

108. Clean the outer surfaces with a stiff brush in the nor-mal manner. Use a water hose or other suitable equip-ment to flush down between the 2 coil sections to re-move dirt and debris.9. Secure the inner and outer coil rows together with afield−supplied fastener.10. Reposition the outer coil section and remove the coilcorner post from between the top panel and centerpost. Reinstall the coil corner post and access panel.11. Replace all screws.EVAPORATOR COILSThe evaporator coil uses the traditional round-tube,plate-fin (RTPF) technology. Tube and fin constructionconsists of various optional materials and coatings (seeAPPENDIX I. MODEL NUMBER NOMENCLATURE).Coils are multiple-row. On two-compressor units, theevaporator coil is a face split design, meaning the tworefrigerant circuits are independent in the coil. The bottomportion of the coil will always be circuit A, with the top ofthe coil being circuit B.Coil Maintenance and Cleaning RecommendationRoutine cleaning of coil surfaces is essential to maintainproper operation of the unit. Elimination of contaminationand removal of harmful residues will greatly increase thelife of the coil and extend the life of the unit. Thefollowing maintenance and cleaning procedures arerecommended as part of the routine maintenance activitiesto extend the life of the coil.Removing Surface Loaded FibersSurface loaded fibers or dirt should be removed with avacuum cleaner. If a vacuum cleaner is not available, asoft non- metallic bristle brush can be used. In either case,the tool should be applied in the direction of the fins. Coilsurfaces can be easily damaged. Applying the tool acrossthe fin edges can cause the edges to be easily bent over,damaging the coating of a protected coil.NOTE: Use of a water stream, such as a garden hose,against a surface-loaded coil will drive the fibers and dirtinto the coil. This will make cleaning efforts moredifficult. Surface-loaded fibers must be completelyremoved prior to using a low-velocity clean water rinse. Avacuum cleaner or a soft- bristled brush should be used toremove surface-loaded fibers and dirt.Periodic Clean Water RinseA periodic clean-water rinse is very beneficial for coilsthat are used in coastal or industrial environments.However, it is very important that the water rinse is madewith a very low-velocity water stream to avoid damage tothe fin edges. Monthly cleaning, as described below, isrecommended.Routine Cleaning of Evaporator Coil SurfacesMonthly cleaning with Totaline environmentally soundcoil cleaner is essential to extend the life of the coils. Thiscleaner is available from Carrier Replacement PartsDivision (p/n: P902- 0301 for one-gallon (3.8L) container,and p/n: P902- 0305 for a 5-gallon (18.9L) container). It isrecommended that all round tube coils be cleaned asdescribed below. Coil cleaning should be part of the unit’sregularly scheduled maintenance procedures to ensure along life for the coil. Failure to clean the coils can resultin reduced durability in the environment. When cleaningthe coils, avoid use of the following: coil brighteners acid cleaning prior to painting high pressure washers poor quality water for cleaningTotaline environmentally sound coil cleaner is a non-flammable, hypo allergenic, non bacterial, USDA accept-ed biodegradable agent that will not harm the coil or sur-rounding components such as electrical wiring, paintedmetal surfaces, or insulation. Use of non−recommendedcoil cleaners is strongly discouraged since coil and unitdurability could be affected.Totaline Environmentally Sound Coil CleanerApplication Equipment 2−1/2 gallon garden sprayer Water rinse with low velocity spray nozzlePERSONAL INJURY HAZARDFailure to follow this WARNING can result in severepersonal injury and reduced unit performance.High−velocity water from a pressure washer, gardenhose, or compressed air should never be used to cleana coil. The force of the water or air jet will bend thefin edges and increase airside pressure drop.High−velocity water from a pressure washer cancause severe injury upon contact with exposed bodytissue. Always direct the water stream away from thebody.! WARNINGTotaline Environmentally Sound Coil CleanerApplication Instructions1. Proper protection such as safety glasses, gloves andprotective clothing are recommended during mixingand application.EQUIPMENT HAZARDFailure to follow this CAUTION can result incorrosion and damage to the unit.Harsh chemicals, household bleach or acid or basiccleaners should not be used to clean outdoor or indoorcoils of any kind. These cleaners can be very difficultto rinse out of the coil and can accelerate corrosion atthe fin/tube interface where dissimilar materials are incontact. If there is dirt below the surface of the coil,use the Totaline environmentally sound coil cleaner.CAUTION