Carrier Ecologic Series 3 Controls, Start-up, Operation, Service, And Troubleshooting

Also see for Ecologic 30GX080 Series: User manual Controls, start-up, operation, service, and troubleshooting

10For water [brine] circuits, if the Saturated Suction tempera-ture falls below 34 F (1.1 C) [the Brine Freeze Point], the unitcapacity will not increase. If the Saturated Suction temperaturefalls below 28 F (–2.2 C), [the Brine Freeze Point minus 6° F(3.3° C)], for 90 seconds, all loaders in the circuit are turnedoff. If this condition continues for a total of 3 minutes, the cir-cuit will alarm and shut down.High Condensing Temperature Unloading — Every 10 sec-onds the control checks for the conditions below. Loaders willbe cycled as needed to control the saturated condensing tem-perature below the configured maximum condensing tempera-ture. Configured maximums are 154 F (67.8 C) for 30GX,152 F (66.7 C) for 30HXA, and 122 F (50 C) for 30HXC units.If a circuit’s saturated condensing temperature is more than12° F (6.7° C) below the maximum condensing temperature,the circuit capacity is not allowed to increase. If the saturatedcondensing temperature is more than 2° F (1.1° C) above themaximum condensing temperature for 60 seconds, a loader isturned off. If the saturated condensing temperature rises tomore than 5° F (2.8° C) above the maximum condensing tem-perature during the 60 seconds, a loader is turned off immedi-ately. If all the loaders were already off, the compressor is shutdown and an alarm is generated.MOP (Maximum Operating Pressure) Override — The con-trol monitors saturated condensing and suction temperature foreach circuit as well as differential oil pressure. Based on a con-figurable maximum operating set point (saturated suction tem-perature), set maximum condensing temperature, and mini-mum differential oil pressure, the control may reduce the num-ber of capacity stages being used and/or may lower the EXDposition when system pressures approach the set parameters.Head Pressure ControlGENERAL — The microprocessor controls the condenserfans (30GX) or water valve (30HXC) to maintain the saturatedcondensing temperature to a configurable set point. The30HXA condenserless units with a 09DK condenser use acombination of factory-supplied fan cycling pressure switches(shipped in the 30HXA control box), temperature switches,and an accessory Motormaster® (part no. 50DJ902801 or50DJ902811) or Motormaster III (part no. 30GT910-079) con-trol to control head pressure independent of 30HXA unit con-trol. The fans are staged or speed varied (30GX) or water valvecontrolled (30HXC) based on each circuit’s saturated condens-ing temperature and compressor status. Water cooled units(30HXC) operating at less than 70 F (21.1 C) for entering con-denser water require the use of head pressure control.The chiller must be field configured for the options shownin Table 6. Fan stage settings are shown in Table 7.AIR-COOLED UNITS (30GX) — See Fig. 5 for condenserfan locations.Without Motormaster® Control — The first stage of fans areturned on based on compressor status or a Head Pressure SetPoint based on Saturated Condensing Temperature (SCT).Additional fan stages are added when the SCT exceeds theHead Pressure Set Point. The Head Pressure Set Point is con-figurable in the Set Point subfunction. The default is 113 F(45 C). Once a fan stage has been added, the software tempo-rarily modifies the head pressure set point by adding 15° F(8.3° C) for 35 seconds. A fan stage will be removed when theSaturated Condensing Temperature has been less than theHead Pressure Set Point minus 35 F (19.4 C) for 2 minutes.The control uses the higher of the 2 Saturated CondensingTemperature values for 30GX080-150 and 160 units. For the30GX151 and 161-350 units, each circuit’s fan stages are inde-pendently controlled based on the circuit Saturated Condens-ing Temperature. Refer to Table 7 for condenser fan controlinformation. See Fig. 6A.With Motormaster Control — For low-ambient operation, thelead fan in each circuit can be equipped with the optional oraccessory Motormaster III head pressure controller. If factoryinstalled, the controller will be configured for 4 to 20 mA con-trol. With the Motormaster III option enabled, the PSIO-1module calculates the required output based on Saturated Con-densing temperature, Head Pressure set point, and a PID (pro-portional integral derivative) loop calculation. This 4 to 20 mAoutput is driven through the PSIO-2 module. Proportional,Integral, and Derivative gain parameters for air cooled controlsare adjustable and can be found in the Service subfunction.Checkout and adjustment of the PID loop should only beperformed by certified Carrier Comfort Network technicians.To obtain this accessory for field installation, order by partnumber 30GX-900---012 for a single controller package(30GX080-150 and 160). Order part number 30GX-900---014for a dual controller package (30GX151 and 161-350). Thesepackages contain all the hardware required to install the acces-sory. See Fig. 6B.The control will use the higher of the 2 Saturated Condens-ing Temperature values for 30GX080-150 and 160 units. Forthe 30GX151 and 161-350 units, each circuit’s fan stages areindependently controlled based on the circuit Saturated Con-densing Temperature. Refer to Table 8 for condenser fan stag-ing information.474645444342410 200 400 600 800 1000TIME (SECONDS)2 STARTS3 STARTSDEADBAND EXAMPLELWT (F)MODIFIEDDEADBANDSTANDARDDEADBAND8765LWT (C)LEGENDLWT — Leaving WaterTemperatureFig. 4 — Deadband Multiplier