Carrier AquaSnap 61WG Series Installation, Operation And Maintenance Instructions

Also see for AquaSnap 30WG Series: Operation instructions

Contents

Carrier AquaSnap 61WG Series Installation, Operation And Maintenance Instructions Manual pdf 7 page image

71 - INTRODUCTION9. Contact your local dealer or installer if you have anyquestions.The information on operating inspections given in annex Cof standard EN378 can be used if no similar criteria exist inthe national regulations.Protection device checks:- If no national regulations exist, check the protectiondevices on site in accordance with standard EN378: oncea year for the high-pressure switches, every five yearsfor external relief valves.- The detailed description of the high-pressure switch testmethod is given in the service manual for the unit.The company or organisation that conducts a pressure switch testshall establish and implement a detailed procedure to fix:- Safety measures- Measuring equipment calibration- Validating operation of protective devices- Test protocols- Recommissioning of the equipment.Consult your nearest service office for this type of test. Here ismentions only the principle of a test without removing the pressureswitch:- Verify and and record the set-points of pressure switchesand relief devices (valves and possible rupture discs)- Be ready to switch-off the main disconnect switch of the powersupply if the pressure switch does not trigger (avoid over-pressure or excess gas in case of valves on the high-pressureside with the recovery condensers)- Connect a calibrated pressure gauge (the values displayedon the user interface may be inaccurate in an instant readingbecause of the scanning delay applied in the control)- Complete an HP Test as provided by the software (refer tothe Control IOM for details).- At least once a year thoroughly inspect the protection devices(valves, pressure switches). If the machine operates in acorrosive environment, inspect the protection devices morefrequently.- Regularly carry out leak tests and immediately repair anyleaks.1.4 - Repair safety considerationsAll installation parts must be maintained by the personnel incharge, in order to avoid material deterioration and injuries topeople. Faults and leaks must be repaired immediately. Theauthorized technician must have the responsibility to repair thefault immediately. After each repair of the unit, check the operationof the protection devices and create a report of the parameteroperation at 100%.Comply with the regulations and recommendations in unit andHVAC installation safety standards, such as: EN 378, ISO 5149,etc.If a leak occurs or if the refrigerant becomes polluted (e.g. by ashort circuit in a motor or BPHE frost) remove the complete chargeusing a recovery unit and store the refrigerant in mobile containers.Repair the leak detected and recharge the circuit with the totalR-410A charge, as indicated on the unit name plate. Do not topup the refrigerant charge. Only charge liquid refrigerant R-410Aat the liquid line.Ensure that you are using the correct refrigerant type beforerecharging the unit.Charging any refrigerant other than the original charge type(R-410A) will impair machine operation and can even destroythe compressors. The compressors operating with thisrefrigerant type are lubricated with a synthetic polyolester oil.For 30WGA units with remote condenser the installer mustclearly note the total refrigerant charge used in the system(in kg) on the label attached to the 30WGA.Before any intervention on the refrigerant circuit the completerefrigerant charge needs to be recovered.RISK OF EXPLOSION: Never use air or a gas containingoxygen during leak tests to purge lines or to pressurise amachine. Pressurised air mixtures or gases containingoxygen can be the cause of an explosion. Oxygen reactsviolently with oil and grease.Only use dry nitrogen for leak tests, possibly with anappropriate tracer gas.If the recommendations above are not observed, this canhave serious or even fatal consequences and damage theinstallation.Never exceed the specified maximum operating pressures.Verify the allowable maximum high- and low-side testpressures by checking the instructions in this manual andthe pressures given on the unit name plate.Do not unweld or flamecut the refrigerant lines or anyrefrigerant circuit component until all refrigerant (liquid andvapour) as well as the oil have been removed from unit. Tracesof vapour should be displaced with dry nitrogen. Refrigerantin contact with an open flame produces toxic gases.The necessary protection equipment must be available, andappropriate fire extinguishers for the system and the refrigeranttype used must be within easy reach.Do not siphon refrigerant.The accidental releases of the refrigerant, due to small leaksor significant discharges following the rupture of a pipe oran unexpected release from a relief valve, can cause frostbitesand burns to personnel exposed. Do not ignore such injuries.Installers, owners and especially service engineers for theseunits must:- Seek medical attention before treating such injuries.- Have access to a first-aid kit, especially for treating eyeinjuries.We recommend to apply standard EN 378-3 Annex 3.Avoid spilling liquid refrigerant on skin or splashing it intothe eyes. Use safety goggles and safety gloves. Wash anyspills from the skin with soap and water. If liquid refrigerantenters the eyes, immediately and abundantly flush the eyeswith water and consult a doctor.Never apply an open flame or live steam to a refrigerantcontainer. Dangerous overpressure can result. If it isnecessary to heat refrigerant, use only warm water.During refrigerant removal and storage operations followapplicable regulations. These regulations, permittingconditioning and recovery of halogenated hydrocarbonsunder optimum quality conditions for the products andoptimum safety conditions for people, property and theenvironment are described in standard NF E29-795.