Carrier 38AUZ*07 Series Installation, Start-up And Service Instructions Manual

Contents

2SAFETY CONSIDERATIONSImproper installation, adjustment, alteration, service,maintenance, or use can cause explosion, fire, electricalshock or other conditions which may cause personalinjury or property damage. Consult a qualified installer,service agency, or your distributor or branch forinformation or assistance. The qualified installer oragency must use factory-authorized kits or accessorieswhen modifying this product. Refer to the individualinstructions packageFollow all safety codes. Wear safety glasses and workgloves. Use quenching cloths for brazing operations andhave a fire extinguisher available. Read these instructionsthoroughly and follow all warnings or cautions attached tothe unit. Consult local building codes for specialrequirements. In absence of local codes, it isrecommended that the USA standard ANSI/NFPA 70,National Electrical Code (NEC), be followed.It is important to recognize safety information. This is thesafety-alert symbol . When you see this symbol on theunit and in instructions or manuals, be alert to thepotential for personal injury.Understand the signal words DANGER, WARNING,CAUTION, and NOTE. These words are used with thesafety-alert symbol. DANGER identifies the most serioushazards which will result in severe personal injury ordeath. WARNING signifies hazards which could result inpersonal injury or death. CAUTION is used to identifyunsafe practices, which may result in minor personalinjury or product and property damage. NOTE is used tohighlight suggestions which will result in enhancedinstallation, reliability, or operation.ELECTRICAL SHOCK HAZARDFailure to follow this warning could cause in personalinjury or death.Before performing service or maintenance operationson unit, always turn off main power switch to unit andinstall lockout tag. Unit may have more than onepower switch.! WARNINGUNIT OPERATION AND SAFETY HAZARDFailure to follow this warning could cause in personalinjury,death and/or equipment damage.PuronR (R--410A) refrigerant systems operate athigher pressures than standard R--22 systems. Do notuse R--22 service equipment or components on Puronrefrigerant equipment.! WARNINGPERSONAL INJURY AND ENVIRONMENTALHAZARDFailure to follow this warning could cause in personalinjury or death.Relieve pressure and recover all refrigerant beforesystem repair or final unit disposal.Wear safety glasses and gloves when handlingrefrigerants. Keep torches and other ignition sourcesaway from refrigerants and oils.! WARNINGCUT HAZARDFailure to follow this caution may result in personalinjury.Sheet metal parts may have sharp edges or burrs. Usecare and wear appropriate protective clothing, safetyglasses and gloves when handling parts and servicing38AUD units.CAUTION!INSTALLATION GUIDELINEReplacement /Retrofit – R22 to PuronRReplacement/retrofit installations require change-out ofoutdoor unit, metering device, and filter driers.Change-out of indoor coil (evaporator) andinterconnecting tubing is recommended.Existing evaporator coil – If the existing evaporator coilmay be re-used, check with the coil manufacturer to verifythe coil construction is suitable for operation with thehigher pressures of PuronR (R-410A). Also determine ifthe existing TXV valve is compatible with R-410A,replace if necessary. The minimum factory test pressurerating must be 1725 kPa (250 psig). Existing coil willneed to be purged with Nitrogen to remove as muchmineral oil as possible to eliminate cross contamination ofoils.Acid test – If the existing system is being replacedbecause of a compressor electrical failure, assume acid isin system. If system is being replaced for any otherreason, use an approved acid test kit to determine acidlevel. If even low levels of acid are detected, install a 100percent activated alumina suction-line filter drier inaddition to the replacement liquid-line filter drier.Remove the suction line filter drier as soon as possible,with a maximum of 72 hr of operation. Recommendation:Install a ball valve in the liquid line at the filter drierlocation when installing a suction filter in the suction line.38AUD