Carrier AquaSnap 30MPA Series Controls, Start-up, Operation, Service, And Troubleshooting

Also see for AQUASNAP 30MPA: User manual Operation and service manual Installation instructions

Carrier AquaSnap 30MPA Series Controls, Start-up, Operation, Service, And Troubleshooting Manual pdf 40 page image

40Operating LimitationsTEMPERATURES — See Table 39 for 30MP standardtemperature limits. The 30MPW050-071 and 30MPA050-071 units use different compressors that require differentoperating envelopes. The 30MPW050-071 units (standardcondensing) use water-cooled optimized compressors,which operate at lower condensing temperatures. The30MPA050-071 units and 30MPW050-071 heat reclaimunits use air-cooled optimized compressors, which allowfor higher condensing temperatures.High Cooler Leaving Chilled Water (Fluid) Temperatures(LCWT) — During start-up with cooler the LCWT should notbe above approximately 60 F (16 C).Low Cooler LCWT — For standard units with fresh water,the LCWT must be no lower than 40 F (4.4 C). For standardunits with a proper brine solution, the LCWT must be no lowerthan 32 F (0° C). If the unit is the factory-installed optionalmedium temperature brine unit, the cooler LCWT can godown to 15 F (–9.4 C).Table 39 — Temperature Limits forStandard 30MP UnitsLEGEND*For sustained operation, EWT should not exceed 85 F (29.4 C).†Unit requires modification below this temperature.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 SEQUENCEThe unit is started by putting the ENABLE/OFF/REMOTECONTROL switch in the ENABLE or REMOTE CONTROLposition. When the unit receives a call for cooling (either fromthe internal control or CCN network command or remote con-trol 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.For all units, if temperature reset is being used, the unit con-trols to a higher leaving-fluid temperature as the building loadreduces. If demand limit is used, the unit may temporarily beunable to maintain the desired leaving-fluid temperature be-cause of imposed power limitations.SERVICEService Test — Both main power and control circuitpower must be on.The Service Test function should be used to verify properoperation of condenser output, compressors, minimum loadCAUTIONDo not operate with cooler leaving chiller water (fluid)temperature (LCWT) below 32 F (0° C) for standard unitswith proper brine solution, 40 F (4.4 C) for the standardunits with fresh water, or below 15 F (–9.4 C) for units fac-tory built for medium temperature brine, or unit damagemay occur.TEMPERATURE LIMIT30MPA,30MPW015-045,30MPW050-071HIGHCONDENSINGSTANDARD30MPW050-071F C F CMaximum Condenser LWT 140 60 120 49Minimum Condenser EWT 65 18 65 18Maximum Cooler EWT* 75 23 75 23Maximum Cooler LWT 60 15 60 15Minimum Cooler LWT† 40 4 40 4EWT — Entering Fluid (Water) TemperatureLWT — Leaving Fluid (Water) TemperatureIMPORTANT: Medium temperature brine duty application(below 32 F [0° C] LCWT) for chiller normally requiresfactory modification. Contact your Carrier representativefor applicable LCWT range for standard water-cooledchiller 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.WARNINGElectrical shock can cause personal injury and death. Shutoff all power to this equipment during service. There maybe more than one disconnect switch. Tag all disconnectlocations to alert others not to restore power until work iscompleted.