Carrier 30HXA Installation Instructions Manual

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installation instructions

Table 3 — Liquid Line 2 F (1.1 C) Drop inSaturated Temperature ExampleSATURATEDLIQUIDTEMPPRESSURER-134a R-22F C Psig kPa Psig kPa100 37.7 124.3 857 195.9 135198 36.7 120.1 828 190.2 1311D PRESSURE 4.2 29 5.7 40Discharge lines should be looped above the compressorsto avoid having charge flowing back to the oil separator andcompressor during unit shutdown. Wrap back-pressure valvewhen brazing discharge line to avoid damaging the valve.It is recommended that field-supplied pressure relief valvesbe installed in each discharge line. Most local codes requirethat the relief valves be vented directly to the outdoors. Thevent must not be smaller than the relief valve outlet, and thepressure setting should be 320 psig (2205 kPa).Run a field-supplied 1⁄ 4-in. (6.4 mm) copper line betweenthe back-pressure valve on the oil separator (bottom pres-sure vessel) to the fitting on the refrigerant line entering theeconomizer port of the compressor to measure oil pressuredifferential. See Fig. 11. The back-pressure valve and the fit-ting on the refrigerant line have a 1⁄ 4-in. flare fitting for mak-ing this connection. The flare nut is field supplied.IMPORTANT: There is a Schrader-type fitting in eachof the two 1 ⁄4-in. fittings. These Schrader-type fittingsMUST BE REMOVED before running the line.The 30HXA units are shipped from the factory with a hold-ing charge of R-134a. Before opening the refrigerant sys-tem, relieve system pressure and recover system refrigerantthrough the charging valve on the cooler.30HXC CONDENSER CONNECTIONS — The inlet fluidconnection is always the lower of the 2 condenser con-nections. It is recommended that a screen strainer with aminimum of 20 mesh be installed ahead of the condenserinlet to prevent debris from damaging the internal condensertubes.The outlet water connection is the upper connection ofthe 2 connections. The condenser has weld couplings toconnect field-supplied piping. Plan the piping arrangementin accordance with good piping practices and so that the pip-ing does not cross in front of the condenser head. Use flex-ible connections on the condenser piping to reduce vibrationtransmission. Offset the piping to permit condenser head re-moval for maintenance purposes. Install pipe hangers whereneeded. Make sure no weight or stress is placed on the waternozzle.NOTES:1. Values are for a 2° F pressure drop at 125 F (51.7 C) saturated discharge tem-perature, 120 F (48.9 C) saturated condensing temperature, and 105 F (40.6 C)liquid refrigerant temperature.2. Size each circuit separately.Fig. 9 — R-134a Liquid Line Sizing, 30HXA Units12