Carrier AQUASNAP 30RAP010-150 Start Up & Operation Manual

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Carrier AQUASNAP 30RAP010-150 Start Up & Operation Manual Manual pdf 44 page image

44CSP.1) or (Set PointsCOOLCSP.2), or if reset isused, with the control point (Run StatusVIEWCTPT).6. Check the cooler leaving chilled water temperature to seethat it remains well above 32 F (0° C), or the brine freez-ing point if the unit is a medium temperature brine unit.7. Recheck compressor oil level (see Oil Charge section).Check Refrigerant Charge — All 30RAP units areshipped with a complete operating charge of R-410A andshould be under sufficient pressure to conduct a leak test afterinstallation. If there is no system pressure, admit nitrogen untila pressure is observed and then proceed to test for leaks. Afterleaks are repaired, the system must be dehydrated.All refrigerant charging should be done through the 1/4-in.Schrader connection on the liquid line. Do NOT add refrigerantcharge through the low-pressure side of the system. If completecharging is required, weigh in the appropriate charge for thecircuit as shown on the unit nameplate. If partial charging is re-quired, operate circuit at full load and use an accurate tempera-ture sensor on the liquid line as it enters the EXV. Use the Tem-peratures mode on the scrolling marquee display to show thecircuit saturated condensing temperature (Tempera-turesCIR.ASCT.A) or (TemperaturesCIR.BSCT.B). Charging is most accurate at saturated discharge tem-peratures of 120 to 125 F (49 to 52 C). Block condenser airflowas required to reach this temperature range. Add refrigerant un-til the system subcooling (SCT.A or SCT.B minus liquid linetemperature entering EXV) is approximately 15 to 17 F (–9.4to –8.3 C). Refrigerant VAPOR only may be added to a circuitthrough the 1/4-in. suction Schrader connection on the suctionline.Charge Adjustment for Brine Operation —For 30RAP010-060 units, the 30RAP chiller does not require amedium temperature brine modification at any temperaturewithin the chiller application range which is as low as 14 F(–10 C) leaving fluid temperature.For 30RAP070-150 units, see Table 18 for proper changeadjustment.Operating LimitationsCOOLER FLOW RATES AND LOOP VOLUMES —Refer to Table 19 for minimum and maximum cooler flowrates. Refer to Table 20 for minimum fluid volume require-ments.TEMPERATURES (See Table 21 for 30RAP standard tem-perature limits).Table 18 — Charge Adjustment for Brine OperationTable 19 — Minimum Cooler Flow RatesCAUTIONNever charge liquid into low-pressure side of system. Donot overcharge. Overcharging results in higher dischargepressure, possible compressor damage, and higher powerconsumption. During charging or removal of refrigerant, besure water is continuously circulating through the cooler toprevent freezing.CAUTIONDo not operate with cooler leaving chiller water (fluid)temperature (LCWT) below 40 F (4.4 C) for the standardunits, or below 15 F (–9.4 C) for units factory built formedium temperature brine.Charge to be Removed from Brine Operation (lb)070 080 090 100 115 130 150Leaving BrineTemperature Ckt A Ckt B CktA Ckt B Ckt A Ckt B Ckt A Ckt B Ckt A Ckt B Ckt A Ckt B Ckt A Ckt B44F-35F No Change is Needed34F-15F 0.8 1.1 1.1 1.1 1.1 1.1 1.1 2.0 2.0 2.0 2.0 3.0 3.0 3.030RAPSIZEMINIMUM COOLER FLOWRATE (gpm)MAXIMUM COOLER FLOWRATE (gpm)MINIMUM COOLER FLOWRATE (l/s)MAXIMUM COOLER FLOWRATE (l/s)010 13 50 0.8 3.2015 17 66 1.1 4.2018 20 78 1.3 4.9020 23 91 1.5 5.7025 28 112 1.8 7.1030 33 133 2.1 8.4035 41 164 2.6 10.3040 47 186 3.0 11.7045 53 209 3.3 13.2050 57 228 3.6 14.4055 63 251 4.0 15.8060 68 270 4.3 17.0070 86 310 5.4 19.6080 98 355 6.2 22.4090 107 387 6.8 24.4100 123 444 7.8 28.0115 140 503 8.8 31.7130 158 569 10.0 35.8150 175 629 11.0 39.6