Carrier AQUASNAP 30RB060-390 Controls, Start-up, Operation, Service And Troubleshooting Instructions

Also see for AQUASNAP 30RBA315: Installation instructions

56grease. If fan motor must be removed for service or replace-ment, be sure to regrease fan shaft and reinstall fan guard. Thefan motor has a step in the motor shaft. For proper perfor-mance, fan should be positioned such that it is securely seatedon this step. Tighten the bolt to 12 to 15 ft-lb (16 to 20 N-m).Refrigerant CircuitLEAK TESTING — Units are shipped with complete operat-ing charge of refrigerant R-410A (see Physical Data tablessupplied in the 30RB Installation Instructions) and should beunder sufficient pressure to conduct a leak test. If there is nopressure in the system, introduce enough nitrogen to search forthe leak. Repair the leak using good refrigeration practices.After leaks are repaired, system must be evacuated anddehydrated.REFRIGERANT CHARGE — Refer to Physical Data tablessupplied in the 30RB Installation Instructions). Immediatelyahead of filter drier in each circuit is a factory-installed liquidline service valve. Each filter drier has a 1/4-in. Schrader con-nection for charging liquid refrigerant.Charging with Unit Off and Evacuated — Close liquid lineservice valve before charging. Weigh in charge shown on unitnameplate. Open liquid line service valve; start unit and allowit to run several minutes fully loaded. Check for a clear sightglass. Be sure clear condition is liquid and not vapor.Charging with Unit Running — If charge is to be added whileunit is operating, all condenser fans and compressors must beoperating. It may be necessary to block condenser coils at lowambient temperatures to raise condensing pressure to approxi-mately 450 psig (3102 kPa) to turn all condenser fans on. Donot totally block a coil to do this. Partially block all coils inuniform pattern. Charge each circuit until sight glass showsclear liquid, and has a liquid line temperature of 103 F (39 C).Safety Devices — Chillers contain many safety devicesand protection logic built into electronic control. Following is abrief summary of major safeties.COMPRESSOR PROTECTIONCircuit Breaker — Each compressor is equipped with onemolded case circuit breaker to provide short circuit protection.Do not bypass or increase size of a breaker to correct problems.Determine cause for trouble and correct before resetting break-er. Circuit breaker current rating is listed on individual circuitbreakers.A high-pressure switch with a trip pressure of 641 psig(4419 kPa) is mounted on the discharge line of each circuit.Switch is wired in series with the SPM modules of all compres-sors in the circuit. If switch opens, the SPM opens all compres-sor contactors in the circuit and all compressors are locked off.See the table below for high pressure switch protection.CRANKCASE HEATERS — Each compressor has a 56-wcrankcase heater to prevent absorption of liquid refrigerant byoil in crankcase when compressor is not running. Heater powersource is control power transformer.Relief Devices — Fusible plugs are located in eachcircuit to protect against damage from excessive pressures.HIGH-SIDE PROTECTION — One device is located be-tween condenser and filter drier; a second is on filter drier.These are both designed to relieve pressure on a tempera-ture rise to approximately 210 F (99 C).LOW-SIDE PROTECTION — A device is located onsuction line and is designed to relieve pressure on a tempera-ture rise to approximately 170 F (77 C).Some local building codes require that relieved gases beremoved. This connection will allow conformance to thisrequirement.CompressorsCOMPRESSOR REPLACEMENT — To change out afaulty compressor, refer to the compressor replacement proce-dure included with the new compressor.OIL CHARGE — All units are factory charged with polyolester (POE) oil to 7/8 sight glass. Acceptable oil level for eachcompressor is 3/4 to 7/8 full in the sight glass.When additional oil or a complete charge is required it mustmeet the following specifications:• Manufacturer . . . . . . . . . . . . . . . . .ICI Emkarate RL 32H• Oil Type. . . . . . . . . . . . . . . . Inhibited polyol ester-basedsynthetic compressor lubricant.• ISO Viscosity Grade . . . . . . . . . . . . . . . . . . . . . . . . . . 32Do not reuse drained oil or any oil that has been exposed tothe atmosphere.IMPORTANT: Check for proper fan rotation (coun-terclockwise viewed from above). If necessary, switchany 2 power leads to reverse fan rotation.IMPORTANT: When adjusting refrigerant charge,circulate fluid through cooler continuously to preventfreezing and possible damage to the cooler. Do not over-charge, and never charge liquid into the low-pressureside of system.DEVICE CUT-OUT CUT-INHigh PressureSwitch641 ± 10 psi(4420 ± 70 kPa)493 ± 29 psi(3400 ± 200 kPa)IMPORTANT: Never open any switch or disconnectthat deenergizes crankcase heaters unless unit is beingserviced or is to be shut down for a prolonged period.After a prolonged shutdown or service, energizecrankcase heaters for 24 hours before starting unit.WARNINGDo not supply power to unit with compressor coverremoved. Failure to follow this warning can cause a fireresulting in personal injury or death.WARNINGExercise extreme caution when reading compressor cur-rents when high-voltage power is on. Correct any of theproblems described below before installing and running areplacement compressor. Wear safety glasses and gloveswhen handling refrigerants. Failure to follow this warningcan cause a fire, resulting personal injury or death.CAUTIONDo not manually operate contactors. Serious damage to themachine may result.CAUTIONThe compressor in a Puron® system uses a polyol ester(POE) oil. This oil is extremely hygroscopic, meaning itabsorbs water readily. POE oils can absorb 15 times asmuch water as other oils designed for HCFC and CFCrefrigerants. Take all necessary precautions to avoid expo-sure of the oil to the atmosphere.