Carrier 30RBM 160 Installation, Operation And Maintenance Instructions

Also see for 30RBM 160: Installation, operation and maintenance instructions

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Carrier 30RBM 160 Installation, Operation And Maintenance Instructions Manual pdf 5 page image

5Provide a drain in vent line, close to each relief valve, to avoidan accumulation of condensate or rain water.It is recommended to install an indicating device to checkwhether some of the fluid has leaked from the relief valve.The presence of oil at the outlet orifice is a useful indicatorthat refrigerant has leaked. Keep this orifice clean to ensurethat any leaks are obvious. The calibration of a valve that hasleaked is generally lower than its original calibration. The newcalibration may affect the operating range. To avoid nuisancetripping or leaks, replace or re-calibrate the valve.Protective device checks:If no national regulations exist, check the protective deviceson site in accordance with standardEN 378: once a year for the high pressure switches, every fiveyears for external relief valves.The company or organisation that conducts a pressure switchtest must establish and implement detailed procedures for:• Safety measures,• Measuring equipment,• Values and tolerances for cut-off and discharge devices,• Test stages,• Recommissioning of the equipment.The principle for performing a test without disassembly of thepressure switch is given here, however the manufacturerrecommends contacting the Service for this type of test:• Verify and record the set-points of pressure switches andexternal relief devices (valves and possible rupture discs),• Be ready to switch off the main disconnect switch of thepower supply if the pressure switch does not trigger (avoidoverpressure or excess gas if there are valves on the highpressure side on the recovery air-cooled exchangers, forexample),• Connect a calibrated pressure differential gauge withintegral damping (oil bath with pointer if mechanical);instantaneous reading gauges may give inaccuratereadings because of the control's scanning delay,• Carry out the HP quicktest built into the control (referto the Service Guide).If the test results in the replacement of the pressureswitch, it is necessary to recover the refrigerantcharge; these pressure switches are not installed onSchrader type automatic valves.If the unit operates in a corrosive atmosphere, inspect thedevices more frequently.Do not attempt to repair or recondition a valve if there hasbeen any corrosion or build-up of foreign material (rust, dirt,scale, etc.) on the valve body or mechanism. In this case, itmust be replaced.Do not install relief valves in series or backwards.1.2 - Refrigerant safety considerationsUse safety goggles and safety gloves.All precautions concerning handling of refrigerant must beobserved in accordance with local regulations.If a leak occurs or if the refrigerant becomes contaminated(e.g by a motor short circuit or BPHE freeze-up), and beforeany intervention, remove the complete charge using a recoveryunit and store the refrigerant in mobile containers. Thecompressors cannot transfer the whole refrigerant charge andcan be damaged if used to pump-down. The refrigerant chargeshould not be transferred to the high-pressure side.Repair the leak, detect and check the type of refrigerant inthe unit and then recharge the unit/circuit with the total charge,as indicated on the unit nameplate. Do not top up therefrigerant charge. Only charge the liquid refrigerant given onthe nameplate at the liquid line.Charging any refrigerant other than the original type willimpair unit operation and can even cause irreparable damageto the compressors. The compressors operating with thisrefrigerant type are lubricated with a synthetic polyolester oil.Do not unweld the refrigerant ductwork or any refrigerant circuitcomponent or cut these with a torch until all refrigerant (liquidand vapour) as well as the oil have been removed from the unit.Traces of vapour should be displaced with dry air nitrogen.Refrigerant in contact with an open flame produces toxic gases.Do not siphon refrigerant.Any accidental release of refrigerant, whether this is caused bya small leak or significant discharges following the rupture ofa pipe or an unexpected release from a relief valve, may causeany personnel exposed to experience heart palpitations,faintness, frostbite and burns. Always take any such eventseriously.Installers, owners and especially service engineers for theseunits must:• Create a procedure to ensure medical attention is soughtbefore treating any symptoms;• Provide first aid equipment, flush the eyes and skinimmediately if splashed with refrigerant, and seek medicalattention.We recommend applying standard EN 378-3 Appendix 3.Ensure there is sufficient ventilation if the unit is installed inan enclosed area. In gas form, refrigerant is heavier than airand, if allowed to accumulate in a confined area, it can reducethe quantity of oxygen in the air, causing respiratory issues.The refrigerant used in units in this range is R410A, a high-pressure fluid (the operating pressure of the unit is greaterthan 40 bar).Special equipment must be used when working on therefrigerating circuit (pressure gauge, charge transferequipment, etc.).