Carrier 30HXC Installation, Operation And Maintenance Instructions

Also see for 30HXC Series: Installation, operation and maintenance instructions Installation, operation and maintenance instructions

Contents

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

5When the unit is subjected to fire, safety devices prevent rupturedue to over-pressure by releasing refrigerant. The fluid maythen be decomposed into toxic residues when subjected to theflame:• Stay away from the unit• Set up warnings and recommendations for personnel incharge to stop the fire.• Fire extinguishers appropriate to the system and therefrigerant type must be easily accessible.The external relief valves must in principle be connected todischarge pipes for units installed in a room. Refer to theinstallation regulations, for example those of European standardsEN 378 and EN 13136.They include a sizing method and examples for configurationand calculation. Under certain conditions these standards permitconnection of several valves to the same discharge pipe. Note:Like all other standards these EN standards are available fromnational standards organisations.These pipes must be installed in a way that ensures that peopleand property are not exposed to refrigerant leaks. These fluidsmay be diffused in the air, but far away from any building airintake, or they must be discharged in a quantity that is appropriatefor a suitably absorbing environment.It is recommended to install an indicating device to show if partof the refrigerant has leaked from the valve. The presence of oilat the outlet orifice is a useful indicator that refrigerant hasleaked. Keep this orifice clean to ensure that any leaks are obvious.The calibration of a valve that has leaked is generally lowerthan its original calibration. The new calibration may affect theoperating range. To avoid a nuisance tripping or leaks, replaceor re-calibrate the valve.Periodic check of the relief valves: See paragraph 1.3“Maintenance safety considerations”.Provide a drain in the discharge circuit, close to each reliefvalve, to avoid an accumulation of condensate or rain water.Ensure good ventilation, as accumulation of refrigerant in anenclosed space can displace oxygen and cause asphyxiation orexplosions.Inhalation of high concentrations of vapour is harmful andmay cause heart irregularities, unconsciousness, or death.Vapour is heavier than air and reduces the amount of oxygenavailable for breathing. These products cause eye and skinirritation. Decomposition products are hazardous.1.2 - Equipment and components under pressureThe units are intended to be stored and operate in an environmentwhere the ambient temperature must not be less than the lowestallowable temperature indicated on the nameplate. See section“10.2 - Pressure vessels”.1.3 - Maintenance safety considerationsCarrier recommends the following drafting for a logbook (thetable below should not be considered as reference and does notinvolve Carrier responsibility):Intervention Name of thecommissioningengineerApplicablenationalregulationsVerificationOrganismDate Nature (1)(1) Maintenance, repairs, regular verifications (EN 378), leakage, etc.Engineers working on the electric or refrigeration componentsmust be authorized, trained and fully qualified to do so.All refrigerant circuit repairs must be carried out by a trainedperson, fully qualified to work on these units. He must have beentrained and be familiar with the equipment and the installation.All welding operations must be carried out by qualified specialists.The insulation must be removed and heat generation must belimited by using a wet cloth.Any manipulation (opening or closing) of a shut-off valve mustbe carried out by a qualified and authorised engineer. Theseprocedures must be carried out with the unit shut-down.NOTE: The unit must never be left shut down with the liquidline valve closed, as liquid refrigerant can be trapped betweenthis valve and the expansion device. (This valve is situated onthe liquid line before the filter drier box.)During any handling, maintenance and service operations theengineers working on the unit must be equipped with safetygloves, glasses, shoes and protective clothing.Never work on a unit that is still energized.Never work on any of the electrical components, until the generalpower supply to the unit has been cut using the disconnectswitch(es) in the control box(es).If any maintenance operations are carried out on the unit, lockthe power supply circuit in the open position ahead of themachine.If the work is interrupted, always ensure that all circuits arestill deenergized before resuming the work.ATTENTION: Even if the unit has been switched off, the powercircuit remains energized, unless the unit or circuit disconnectswitch is open. Refer to the wiring diagram for further details.Attach appropriate safety labels.Operating checks:IMPORTANT INFORMATION REGARDING THEREFRIGERANT USED:• This product contains fluorinated greenhouse gas coveredby the Kyoto protocol.Fluid type: R134aGlobal Warming Potential (GWP): 1430