8ENHANCED COPPER TUBINGEnhanced copper tubing is more efficient and durableand can be repaired in the field, if required.Because copper is a very stable metal, it is durable andresists corrosion. Enhanced copper tubing increases:• heat transfer capability• the efficiency of the cooling and heating processes• thermal conductivity (by creating additional tubesurface and turbulent refrigerant gas flow)Every Carrier PTAC coil undergoes thorough leak test-ing and pressure testing up to 350 lbs per square inch.SEAMLESS BASEPANSeamless drawn basepan walls add protection againstwater accumulation resulting from storm-driven rainwith heavy wind.Carrier’s deep basepan holds up to two gallons ofwater without spilling. Closed cell foam insulators arelocated between the basepan and coils, keeping coilsfrom direct contact with the basepan and providingadditional protection against corrosion.CONDENSATE DRAIN VALVEThe temperature-activated drain opens when the out-door temperature drops below 45 F to prevent waterfrom freezing in the basepan.CONDENSATE REMOVALSYSTEMCarrier’s 52S Series units have a slinger ring aroundthe outside of the outdoor fan propeller. Condensate(water) in the unit basepan is picked up by the slingerring and dispersed onto the hot outdoor condensercoil. The heat from the coil evaporates the con-densate and cools the coil at the same time, therebyremoving condensate and increasing the unit’sefficiency.NOTE: If it is necessary to remove 100% of the con-densate, we recommend using the Carrier Drain Kit(Part No.: DRAIN-KIT-4PK).CARRIER WARRANTYCarrier’s full one-year warranty is the most compre-hensive in the industry. In addition, Carrier provides:• Full coverage for parts and labor.• Four additional years of coverage on sealed refrig-eration systems.• Limited second through fifth year coverage on non-refrigeration system parts.PRODUCT FEATURES AND BENEFITS (cont)BASEPANCONDENSATEDRAIN VALVEEnhanced Copper TubingDeep Basepan Protects AgainstWater Accumulation