Carrier AQUASNAP 30RAP010-150 Start Up & Operation Manual

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Carrier AQUASNAP 30RAP010-150 Start Up & Operation Manual Manual pdf 45 page image

45Table 20 — Minimum Fluid Volume in CirculationLEGENDHigh Cooler Leaving Chilled Water (Fluid) Temperatures(LCWT) — During start-up with cooler LCWT above approx-imately 60 F (16 C), the unit expansion valve will limit suctionpressure to approximately 90 psig (620 kPa) to avoid overload-ing the compressor.Low Cooler LCWT — For standard units, the LCWT must beno lower than 40 F (4.4 C). If the unit is the factory-installedoptional medium temperature brine unit, the cooler LCWT cango down to 15 F (–9.4 C).Table 21 — Temperature Limits forStandard 30RAP UnitsLEGEND*For sustained operation, EWT should not exceed 85 F (29.4 C).†Unit requires modification below this temperature.LOW-AMBIENT OPERATION — If operating temperaturesbelow 45 F (7 C) on size 018-030 units, and 32 F (0° C) on size035-150 units are expected, accessory Motormaster® V controlmust be installed. Operating temperatures can go as low as–20 F (–29 C) on size 010 and 015 units, as standard. Installa-tion of wind baffles is also required. Refer to separate installa-tion instructions for operation using this accessory. Contactyour Carrier representative for details.VOLTAGE — ALL UNITSMain Power Supply — Minimum and maximum acceptablesupply voltages are listed in the Installation Instructions.Unbalanced 3-Phase Supply Voltage — Never operate a motorwhere a phase imbalance between phases is greater than 2%.To determine percent voltage imbalance:The maximum voltage deviation is the largest differencebetween a voltage measurement across 2 legs and the averageacross all 3 legs.Example: Supply voltage is 240-3-60.AB = 243 vBC = 236 vAC = 238 v1. Determine average voltage:2. Determine maximum deviation from average voltage:(AB) 243 – 239 = 4 v(BC) 239 – 236 = 3 v(AC) 239 – 238 = 1 vMaximum deviation is 4 v.3. Determine percent voltage imbalance:This voltage imbalance is satisfactory as it is below themaximum allowable of 2%.Control Circuit Power — Power for the control circuit issupplied from the main incoming power through a factory-installed control power transformer (TRAN1) for all models.Field wiring connections are made to the LVT.OPERATION SEQUENCEDuring unit off cycle, the control monitors the outdoor airtemperature. If the ambient temperature drops below 40 F(4.4 C), cooler and hydronic system heaters (if either are facto-ry installed) are energized. If power is maintained to the chillerand the EMERGENCY ON/OFF switch is left in the OFF po-sition, these heaters are also energized.The unit is started by putting the ENABLE/OFF/REMOTECONTACT switch in the ENABLE or REMOTE CONTACTposition. When the unit receives a call for cooling (either fromthe internal control or CCN network command or remote con-tact closure), the unit stages up in capacity to maintain the leav-ing fluid set point. The first compressor starts 11/2 to 3 minutesafter the call for cooling.The lead circuit can be specifically designated on all modelsor selected based on compressor run hours and starts depend-ing on field configuration. The unit control will override thisselection under certain starting conditions to properly maintainoil return to the compressors. In general, on dual compressorcircuits, the control will most often start the A1 or B1 compres-sor first, especially after long off periods. The MBB controlsfan stages to maintain the head pressure set point and will auto-matically adjust unit capacity as required to keep compressorsfrom operating outside of the specified envelope. There are nopumpout or pumpdown sequences on these chillers.30RAPUNITSIZENORMAL AIRCONDITIONINGAPPLICATIONgal/ton (L per kW)PROCESS COOLING ORLOW AMBIENT OPERATIONAPPLICATIONgal/ton (L per kW)Std Unit HGBP Digital Std Unit HGBP Digital010,015 12 (13) N/A 3 (3.3) 12 (13) N/A 6 (6.5)018-030 6 (6.5) 4 (4.3) 3 (3.3) 10 (10.8) 10 (10.8) 6 (6.5)035-150 3 (3.3) 3 (3.3) 3 (3.3) 6 (6.5) 6 (6.5) 6 (6.5)HGBP — Hot Gas BypassUNIT SIZE 30RAP 010-030 035-150Temperature F C F CMaximum AmbientTemperature 120 49 120 49Minimum AmbientTemperature 45 7 32 0Maximum Cooler EWT* 95 35 95 35Maximum Cooler LWT 70 21 70 21Minimum Cooler LWT† 40 4.4 40 4.4EWT — Entering Fluid (Water) TemperatureLWT — Leaving Fluid (Water) TemperatureCAUTIONBrine duty application (below 40 F [4.4 C] LCWT) forchiller normally requires factory modification. Contactyour Carrier representative for applicable LCWT range forstandard water-cooled chiller in a specific application.% Voltage Imbalance = 100 xmax voltage deviationfrom avg voltageaverage voltageAverage voltage = 243 + 236 + 2383= 7173= 239% Voltage Imbalance = 100 x 4239= 1.7%IMPORTANT: If the supply voltage phase imbalance ismore than 2%, contact your local electric utility companyimmediately. Do not operate unit until imbalance conditionis corrected.