Carrier AQUAFORCE 30XA080-500 Controls, Start-up, Operation, Service And Troubleshooting Instructions

Also see for AQUAFORCE 30XA080: Installation instructions Controls, start-up, operation, service and troubleshooting instructions Installation instructions Product data

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Carrier AQUAFORCE 30XA080-500 Controls, Start-up, Operation, Service And Troubleshooting Instructions Manual pdf 60 page image

60Operating LimitationsTEMPERATURES — Unit operating temperature limits arelisted in the table below.LEGEND*For sustained operation, EWT should not exceed 70 F (21.1 C).†Unit requires brine modification for operation below thistemperature.Low Ambient Temperature Operation — If unit operatingtemperatures below 32 F (0° C) are expected, refer to separateunit installation instructions for low ambient temperature oper-ation using accessory low ambient temperature head pressurecontrol, if not equipped. Contact your Carrier representative fordetails.NOTE: If wind velocity is expected to be greater than 5 mph(8 km/h) wind baffles and brackets must be field-fabricatedand installed for all units using accessory low ambient headpressure control. See the 30XA Installation Instructions or thelow ambient temperature head pressure control accessoryinstallation instructions for more information.VOLTAGEMain 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 = 243vBC = 236vAC = 238v1. 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:= 1.7%This voltage imbalance is satisfactory as it is below themaximum allowable of 2%.MINIMUM FLUID LOOP VOLUME — To obtain propertemperature control, loop fluid volume must be at least 3 gal-lons per ton (3.25 L per kW) of chiller nominal capacity for airconditioning and at least 6 gallons per ton (6.5 L per kW) forprocess applications or systems that must operate at low ambi-ent temperatures (below 32 F [0° C]). Refer to application in-formation in Product Data literature for details.FLOW RATE REQUIREMENTS — Standard chillers shouldbe applied with nominal flow rates within those listed in theMinimum and Maximum Cooler Flow Rates table. Higher orlower flow rates are permissible to obtain lower or highertemperature rises. Minimum flow rates must be exceeded toassure turbulent flow and proper heat transfer in the cooler. SeeTable 44. See Fig. 38A-38D for cooler pressure drop curves.Consult application data section in the Product Dataliterature and job design requirements to determine flow raterequirements for a particular installation.TEMPERATURE F CMaximum Ambient Temperature 125 52Minimum Ambient Temperature 32 0Maximum Cooler EWT* 95 35Maximum Cooler LWT 60 15Minimum Cooler LWT† 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. Contact aCarrier Representative for details regarding specificapplications. Operation below 40 F (4.4 C) LCWT with-out modification can result in compressor failure.% Voltage Imbalance = 100 xmax voltage deviation fromavg voltageaverage voltageAverage voltage = 243+236+2383= 7173= 239% Voltage Imbalance = 100 x 4239IMPORTANT: If the supply voltage phase imbal-ance is more than 2%, contact the local electricutility company immediately. Do not operate unituntil imbalance condition is corrected.CAUTIONOperation below minimum flow rate could generatealarms, which could result in damage to the cooler.