Carrier Aquaforce 30XAS Series Installation, Operation And Maintenance Instructions

Also see for Aquaforce 30XAS Series: Operation instructions

Carrier Aquaforce 30XAS Series Installation, Operation And Maintenance Instructions Manual pdf 7 page image

71 - INTRODUCTIONProtection device checks:• If no national regulations exist, check the protectiondevices on site in accordance with standard EN 378:once a year for the high-pressure switches, every fiveyears for external relief valves.The company or organisation that conducts a pressure switch testmust establish and implement detailed procedures for:- Safety measures- Measuring equipment calibration- Validating operation of protective devices- Test protocols- Recommissioning of the equipment.Consult Carrier Service for this type of test. Carrier mentions hereonly the principle of a test without removing the pressure switch:- 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 pressure gauge protected against pulsations (filledwith oil with maximum pointer if mechanical), preferablycalibrated (the values displayed on the user interface maybe inaccurate in an instant reading because of the scanningdelay applied in the control)- Complete an HP Test as provided by the software (refer tothe Control IOM for details).If the machine operates in a corrosive environment, inspectthe protection devices more frequently.Regularly carry out leak tests and immediately repair anyleaks.Ensure regularly that the vibration levels remain acceptableand close to those at the initial unit start-up.Before opening a refrigerant circuit, purge and consult thepressure gauges.Change the refrigerant after an equipment failure, followinga procedure such as the one described in NF E29-795 or carryout a refrigerant analysis in a specialist laboratory.Plug all openings whenever the refrigerant circuit is openedfor up to one day. For longer openings place a nitrogen chargein the circuit.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 contaminated (e.g.by a short circuit in a motor) remove the complete charge usinga recovery unit and store the refrigerant in mobile containers.Repair the leak detected and recharge the circuit with the totalR-134a charge, as indicated on the unit name plate. Certain partsof the circuit can be isolated. Only charge liquid refrigerant R-134aat 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-134a) will impair machine operation and can even lead toa destruction of the compressor. The compressors operatingwith this refrigerant type are lubricated with a syntheticpolyolester oil.RISK OF EXPLOSIONNever use air or a gas containing oxygen during leak tests topurge lines or to pressurise a machine. Pressurised airmixtures or gases containing oxygen can be the cause of anexplosion.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) has been removed from chiller. Traces of vapourshould be displaced with dry air nitrogen. Refrige rant incontact with an open flame produces toxic gases.The necessary protection equipment must be available, andappropriate fire extinguishers for the system and therefrigerant type used must be within easy reach.Do not siphon refrigerant.Avoid spilling liquid refrigerant on skin or splashing it intothe eyes. Use safety goggles. Wash any spills from the skinwith soap and water. If liquid refrigerant enters the eyes,immediately and abundantly flush the eyes with water andconsult a doctor.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.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.