Carrier GT-PX Split Series Installation, Operation & Maintenance Instructions Manual

43R e s i d e n t i a l S p l i t - 6 0 H z R 2 2 & R 4 1 0 AR e v. : 5 J u n e , 2 0 0 8C a r r i e r : Tu r n t o t h e E x p e r t sPreventive MaintenanceWater Coil Maintenance(Direct ground water applications only)If the system is installed in an area with a known high mineralcontent (125 P.P.M. or greater) in the water, it is best toestablish a periodic maintenance schedule with the ownerso the coil can be checked regularly. Consult the well waterapplications section of this manual for a more detailed watercoil material selection. Should periodic coil cleaning benecessary, use standard coil cleaning procedures, which arecompatible with the heat exchanger material and copperwater lines. Generally, the more water flowing through theunit, the less chance for scaling. Therefore, 1.5 gpm perton [2.0 l/m per kW] is recommended as a minimum flow.Minimum fl ow rate for entering water temperatures below50°F [10°C] is 2.0 gpm per ton [2.6 l/m per kW].Water Coil Maintenance(All other water loop applications)Generally water coil maintenance is not needed for closedloop systems. However, if the piping is known to havehigh dirt or debris content, it is best to establish a periodicmaintenance schedule with the owner so the water coilcan be checked regularly. Dirty installations are typicallythe result of deterioration of iron or galvanized piping orcomponents in the system. Open cooling towers requiringheavy chemical treatment and mineral buildup through wateruse can also contribute to higher maintenance. Shouldperiodic coil cleaning be necessary, use standard coilcleaning procedures, which are compatible with both theheat exchanger material and copper water lines. Generally,the more water flowing through the unit, the less chance forscaling. However, flow rates over 3 gpm per ton (3.9 l/m perkW) can produce water (or debris) velocities that can erodethe heat exchanger wall and ultimately produce leaks.Hot Water Generator CoilsSee water coil maintenance for ground water units. If thepotable water is hard or not chemically softened, the hightemperatures of the desuperheater will tend to scale evenquicker than the water coil and may need more frequentinspections. In areas with extremely hard water, a HWG isnot recommended.FiltersFilters must be clean to obtain maximum performance.Filters should be inspected every month under normaloperating conditions and be replaced when necessary. Unitsshould never be operated without a filter.Washable, high efficiency, electrostatic filters, when dirty,can exhibit a very high pressure drop for the fan motor andreduce air fl ow, resulting in poor performance. It is especiallyimportant to provide consistent washing of these filters (inthe opposite direction of the normal air fl ow) once per monthusing a high pressure wash similar to those found at self-serve car washes.Condensate DrainIn areas where airborne bacteria may produce a “slimy”substance in the drain pan, it may be necessary to treat thedrain pan chemically with an algaecide approximately everythree months to minimize the problem. The condensate panmay also need to be cleaned periodically to insure indoorair quality. The condensate drain can pick up lint and dirt,especially with dirty filters. Inspect the drain twice a year toavoid the possibility of plugging and eventual overfl ow.CompressorConduct annual amperage checks to insure that amp draw isno more than 10% greater than indicated on the serial platedata.Fan MotorsConsult air handler I.O.M. for maintenance requirements.Air CoilThe air coil must be cleaned to obtain maximumperformance. Check once a year under normal operatingconditions and, if dirty, brush or vacuum clean. Care mustbe taken not to damage the aluminum fins while cleaning.CAUTION: Fin edges are sharp.Cabinet - “Indoor” Compressor SectionDo not allow water to stay in contact with the cabinet forlong periods of time to prevent corrosion of the cabinet sheetmetal. Generally, cabinets are set up from the floor a fewinches [7 - 8 cm] to prevent water from entering the cabinet.The cabinet can be cleaned using a mild detergent.Refrigerant SystemTo maintain sealed circuit integrity, do not install servicegauges unless unit operation appears abnormal. Referencethe operating charts for pressures and temperatures. Verifythat air and water flow rates are at proper levels beforeservicing the refrigerant circuit.