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

58Oil Filter Maintenance — Each compressor has itsown internal oil filter and each circuit also has an in-line exter-nal filter. The internal oil filter pressure drop should bechecked and filter changed (if necessary) after the initial 200-300 hours of compressor operation. It is recommended that oilline pressure loss checks be made on an annual basis thereafterto determine the need for filter changes. The need for filtermaintenance can be monitored through system pressure drop.Discharge pressure is read at the oil separator and oil pressureis read at the compressor. This pressure differential is typically15 to 20 psi (103 to 138 kPa) for a system with clean internaland external filters. See Pressure Transducers section, page 61for information on removing discharge pressure transducers tomeasure discharge pressure. Figure 18 shows the location ofthe oil pressure bleed port on the compressor. A gage can beattached to this point so that two pressure drops can be mea-sured. The difference between discharge pressure and the gagepressure will be the pressure loss due mainly to the external oilfilter. If this value exceeds 10 psi (69 kPa), replace the externalfilter. The difference between the gage pressure and compres-sor oil pressure is the pressure drop through the internal oil fil-ter. Replace the internal oil filter if the pressure drop is greaterthan 25 psi (173 kPa) for 30HXC and 30 psi (207 kPa) for30GX and 30HXA chillers.REPLACING THE EXTERNAL OIL FILTERFully front seat (close) the angle valves on the filter and atthe compressor. Connect a charging hose to the oil pressurebleed port and drain the oil trapped between service valves. Aquart (liter) of oil is typically what is removed during this pro-cess. Remove the charging hose.Unscrew the nut from the other side of the filter and removethe old filter. Remove protective plastic caps from new filterand install. Draw a vacuum at the bleed port. Remove charginghose. Open angle valve enough to let oil flow. Check both fit-tings for leaks and repair if necessary. Backseat angle valve.REPLACING THE INTERNAL OIL FILTER — Close theservice valves at the compressor and drain the oil using thebleed port. If the oil pressure does not bleed off using thismethod it will be necessary to remove the entire circuit charge.Using a 3/4-in. allen wrench, remove the internal filter accesscover (see Fig. 18 and 19). Remove the old filter. Replacementfilters (one for each compressor) are factory supplied to coverthe first changeout. After that, filters are field supplied. Lightlyoil O-ring in the filter and install with filter open end first intothe housing. Replace access cover and retorque to 150 ft-lb(203 N-m). Follow procedure in previous section for openingangle valve and purging lines. Check for leaks and repair ifnecessary.Compressor Changeout Sequence — Compres-sor service requires metric tools and hardware. Change com-pressors according to the following procedure:1. Turn off all main and control circuit power supplying themachine.2. Close the discharge and liquid valve(s), suction valve, andcooler inlet line service valve (if equipped), oil line shutoffvalve, economizer bubble tube valve (30HXA,C161-271only) and minimum load shutoff valve (if equipped) forcircuit to be changed. Disconnect the oil inlet line from thecompressor. Disconnect oil filter with fitting at shutoffvalve side and set filter and compressor inlet line assemblyaside.3. Remove any remaining refrigerant in the compressor andrefrigerant lines using proper reclaiming techniques. All ofthe refrigerant that is in the cooler must be removed ifthere is no suction service valve installed on the cooler.4. Remove junction box cover of compressor to be changed.Check main power leads for marked numbers. If no num-bers are visible on leads, mark leads with appropriatenumbers to match those printed on the ends of the terminallugs. This is extremely important as power leadsMUST be installed on the exact terminals from whichthey were removed.5. Disconnect main power leads from compressor terminallugs. Mark remaining control circuit wires (connectedtogether with wire nuts) for ease of reconnecting later. Thefollowing color scheme applies (verify with label diagramon panel):Loader 1 2 Violet wiresLoader 2 2 Pink wiresMotor Cooling Solenoid 1 Blue wire, 1 Brown wire *Oil Solenoid 1 Orange wire, 1 Brown wire*High-Pressure Switch 2 Red wires*One lead from the motor cooling and oil solenoids are connectedtogether with a single brown wire.6. Remove loader (mark solenoids no. 1 and 2 for replace-ment) and oil solenoids and high-pressure switch fromcompressor. Using 2 wrenches, carefully remove the oilpressure transducer from the compressor. These will all bereconnected to the replacement compressor.NOTE: Some oil will leak out of the transducer fittingwhen the transducer is removed. See Fig. 18.7. Mark motor temperature leads (2 blue wires) and removefrom quick connect terminals in the junction box.8. Remove the 2 bolts securing the motor cooling/economizerline flange to the compressor.Compressor oil is pressurized. Use proper safety precau-tions when relieving pressure.IMPORTANT: Cooler and condenser pumps must beenergized. Fluid must be flowing through heat exchang-ers whenever adding or removing charge.The next steps involve compressor unbolting and removal.Compressor seals are made using O-rings. Use care whenremoving bolts and disconnecting flanges. The O-ringsmust NOT be re-used. New O-rings are provided with thereplacement compressor. The 06N screw compressorsweigh approximately 920 lb (417 kg). Be sure that anappropriate lifting cart or hoist is used to avoid injury. SeeFig. 20 for lifting locations and center of gravity dimen-sions. Make sure compressor is properly rigged beforeunbolting.JUNCTION BOXOIL BLEED PORTHIGHPRESSURESWITCHLOADERSOLENOIDNO. 1INTERNAL OILFILTER ACCESS(3/4 in.)OIL PRESSURETRANSDUCEROILSOLENOIDLOADERSOLENOIDNO. 2LOADERCOVERPLATEFig. 18 — Transducer Removal