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

Contents

27SERVICERefrigeration SystemCompressor Oil —Servicing Systems on Roofs With SyntheticMaterials — POE (polyolester) compressor lubricants areknown to cause long term damage to some synthetic roofingmaterials. Exposure, even if immediately cleaned up, maycause embrittlement (leading to cracking) to occur in one yearor more. When performing any service which may risk expo-sure of compressor oil to the roof, take appropriate precautionsto protect roofing. Procedures which risk oil leakage includebut are not limited to compressor replacement, repairing refrig-erants leaks, replacing refrigerant components such as filterdrier, pressure switch, metering device, coil, accumulator, orreversing valve.SYNTHETIC ROOF PRECAUTIONARY PROCEDURE1. Cover extended roof working area with an impermeablepolyethylene (plastic) drop cloth or tarp. Cover an ap-proximate 3.3 x 3.3 m (10 x 10 ft) area.2. Cover area in front of the unit service panel with a terrycloth shop towel to absorb lubricant spills and preventrun-offs, and protect drop cloth from tears caused by toolsor components.3. Place terry cloth shop towel inside unit immediately un-der component(s) to be serviced and prevent lubricantrun-offs through the louvered openings in the base pan.4. Perform required service.5. Remove and dispose of any oil contaminated material perlocal codes.Liquid Line Filter Drier — The factory-provided filterdrier is specifically designed to operate with Puron®. Replacethe filter drier with factory-authorized components only with afilter drier with desiccant made from 100% molecular sievegrade XH-11. Filter drier must be replaced whenever the refrig-erant system is opened.When removing a filter drier, use a tubing cutter to cut the drierfrom the system. Do not unsweat a filter drier from the sys-tem. Heat from unsweating will release moisture and contami-nants from drier into system.Field Refrigerant Access Ports — Field serviceaccess to refrigerant pressures is through the access portslocated at the service valves (see Figs 27 and 29). These portsare ¼-in SAE Flare couplings with Schrader check valves andservice caps. Use these ports to admit nitrogen to the fieldtubing during brazing, to evacuate the tubing and evaporatorcoil, to admit initial refrigerant charge into the low-side of thesystem and when checking and adjusting the system refrigerantcharge. When service activities are completed, ensure theservice caps are in place and secure; check for leaks. If theSchrader check valve must be removed and re-installed, tightento 23-34 N-cm (2-3 in-lbs).Factory High-Flow Access Ports — There are twoadditional access ports in the system - on the suction tubebetween the compressor and the suction service valve and onthe liquid tube near the liquid service valve (see Figs 28 and30). These are brass fittings with black plastic caps. The hoseconnection fittings are standard ¼-in SAE Male Flarecouplings.The brass fittings are two-piece High Flow valves, with a re-ceptacle base brazed to the tubing and an integral spring-closedcheck valve core screwed into the base. (See Fig. 25) Thischeck valve is permanently assembled into this core body andcannot be serviced separately; replace the entire core body ifnecessary. Service tools are available from RCD that allow thereplacement of the check valve core without having to recoverthe entire system refrigerant charge. Apply compressor refrig-erant oil to the check valve core's bottom o-ring. Install the fit-ting body with 1085 ±23 N-cm (96 ±-10 in-lbs) of torque; donot overtighten.Fig. 25 — CoreMax Access Port AssemblyEQUIPMENT DAMAGE HAZARDFailure to follow this caution may result in damage toequipment.This system uses Puron® refrigerant which has higherpressures than R-22 and other refrigerants. No other refrig-erant may be used in this system. Gage set, hoses, and re-covery system must be designed to handle Puron®. If youare unsure consult the equipment manufacturer.EQUIPMENT DAMAGE HAZARDFailure to follow this caution may result in damage toequipment.The compressor in a Puron system uses a polyolester(POE) oil. This oil is extremely hygroscopic, meaning itabsorbs water readily. POE oils can absorb 15 times asmuch water as other oils designed for HCFC and CFC re-frigerants. Take all necessary precautions to avoid exposureof the oil to the atmosphere.1/2-20 UNF RH30°0.596.475/8” HEXSEAT COREWASHER DEPRESSOR PER ARI 720+.01/-.035FROM FACE OF BODY7/16-20 UNF RHO-RING45°1/2" HEXThis surface provides a metal to metal seal whentorqued into the seat. Appropriate handling isrequired to not scratch or dent the surface.(Part No. EC39EZ067)