AAON CF Series Installation Operation & Maintenance

Also see for CF Series: Installation operation & maintenance

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AAON CF Series Installation Operation & Maintenance Manual pdf 41 page image

41interior of open motors with cleancompressed air at low pressure.Labeled Motors - It is imperative for repairof a motor with Underwriters’ Laboratorieslabel that original clearances be held; that allplugs, screws, other hardware be fastenedsecurely, and that parts replacements beexact duplicates or approved equals.Violation of any of the above invalidatesUnderwriters’ Label.Access DoorsIf scale deposits or water is found around theaccess doors, adjust door for tightness.Adjust as necessary until leaking stops whendoor is closed.Propeller Fans and MotorsThe fans are directly mounted on the motorshafts and the assemblies require minimalmaintenance except to assure they are clearof dirt or debris that would impede theairflow.Recommended Annual InspectionIn addition to the above maintenanceactivities, a general inspection of the unitsurface should be completed at least once ayear.Air-Cooled CondenserThe air-cooled condenser section rejectsheat by passing outdoor air over the fin tubecoils for cooling of the hot refrigerant gasfrom the compressors.The condenser coils should be inspectedannually to ensure unrestricted airflow. Ifthe installation has a large amount ofairborne dust or other material, thecondenser coils should be cleaned with awater spray in a direction opposite toairflow. Care must be taken to preventbending of the aluminum fins on the coppertubes.E-Coated Coil CleaningDocumented routine cleaning of e-coatedcoils is required to maintain coatingwarranty coverage.Surface loaded fibers or dirt should beremoved prior to water rinse to preventrestriction of airflow. If unable to back washthe side of the coil opposite of the coilsentering air side, then surface loaded fibersor dirt should be removed with a vacuumcleaner. If a vacuum cleaner is not available,a soft non-metallic bristle brush may beused. In either case, the tool should beapplied in the direction of the fins. Coilsurfaces can be easily damaged (fin edgesbent over) if the tool is applied across thefins.ELECTRIC SHOCKElectric shock hazard. Shut off allelectrical power to the unit to avoidshock hazard or injury from rotatingparts.WARNINGPRESSURE CLEANINGHigh velocity water from a pressurewasher or compressed air shouldonly be used at a very low pressureto prevent fin and/or coil damages.The force of the water or air jet maybend the fin edges and increaseairside pressure drop. Reduced unitperformance or nuisance unitshutdowns may occur.CAUTION