Carrier AquaForce PUREtec 30XAV-ZE 401 Installation, Operation And Maintenance Instructions

Contents

5The calibration of a valve that has leaked is generallylower than its original calibration. The new calibration mayaffect the operating range. To avoid a nuisance tripping orleaks, replace or re-calibrate the valve.Periodic check of the relief valves: See paragraph“Maintenance safety considerations”. Provide a drain inthe discharge circuit, close to each relief valve, to avoid anaccumulation of condensate or rain water.Ensure good ventilation, as accumulation of refrigerant inan enclosed space can displace oxygen and causeasphyxiation or explosions.Inhalation of high concentrations of vapour is harmful andmay cause heart irregularities, unconsciousness, or death.Vapour is heavier than air and reduces the amount ofoxygen available for breathing. These products cause eyeand skin irritation. Decomposition products are hazardous.1.2 - Equipment and components under pressureThe units are intended to be stored and operate in anenvironment where the ambient temperature must not beless than the lowest allowable temperature indicated onthe nameplate. See section “Pressure vessels”.1.3 - Maintenance safety considerationsThe owner / operator shall keep an updated logbook of therefrigerating system.In the logbook the following information shall berecorded:• details of all maintenance and repair work;• quantities and kind of (new, reused or recycled)refrigerant which have been charged on eachoccasion, and the quantities of refrigerant which havebeen transferred from the system on each occasion;• analysis of a reused refrigerant, if available, the resultsof which shall also be kept in the log-book;• source of the reused refrigerant;• changes and replacements of components of thesystem;• results of all periodic routine tests;• record of significant periods of non-use.The log-book shall either be kept by the owner / operator,or the data shall be stored in a computer, in which case theinformation shall be accessible to the competent personwhen servicing or testing.Engineers working on the electric or refrigeration compo-nents must be authorized, trained and fully qualified to do so.All refrigerant circuit work must be carried out by atrained person, fully qualified to work on these units. He/she must have been trained and be familiar with theequipment and the installation. All welding operationsmust be carried out by qualified specialists.Before opening a refrigerant circuit, purge and consult thepressure gauges. Reclaim the refrigerant using a properrefrigerant reclaim device and reclaim cylinders.The units can also be lifted with slings, using only thedesignated lifting points marked on the unit.Use slings with the correct capacity, and always followthe lifting instructions on the certified drawings suppliedwith the unit.Safety is only guaranteed, if these instructions are carefullyfollowed. If this is not the case, there is a risk of failureand injuries to personnel.DO NOT COVER ANY PROTECTION DEVICES. Thisapplies to the relief valves (if used) in the refrigerant orheat transfer medium circuits, the fuse plugs and thepressure switches.The external relief valves are designed and installed toensure damage limitation in case of a fire. In accordancewith the regulations applied for the design, the Europeandirective on equipment under pressure and in accordancewith the national usage regulations:• These relief valves (and rupture disk if used) are notsafety accessories but damage limitation accessories incase of a fire,• The high pressure switches are the safety accessories.The relief valve must only be removed if the fire risk isfully controlled and after checking that this is allowed bylocal regulations and authorities. This is the responsibilityof the operator.When the unit is subjected to fire, safety devices preventrupture due to over-pressure by releasing refrigerant. Thefluid may then be decomposed into toxic residues whensubjected to the flame:• Stay away from the unit• Set up warnings and recommendations for personnelin charge to stop the fire.• Fire extinguishers appropriate to the system and therefrigerant type must be easily accessible.The external relief valves must be connected to dischargepipes for units installed in a room. Refer to the installationregulations, for example those of European standards EN-378.These standards include a sizing method and examples forconfiguration and calculation. Under certain conditionsthey permit connection of several valves to the samedischarge pipe.These pipes must be installed in a way that ensures thatpeople and property are not exposed to refrigerant leaks.These fluids may be diffused in the air, but far away fromany building air intake, or they must be discharged in aquantity that is appropriate for a suitably absorbingenvironment (Note that the R1234ze(E) refrigerant isheavier than air).It is recommended to install an indicating device to show ifpart of the refrigerant has leaked from the valve. Thepresence of oil at the outlet orifice is a useful indicator thatrefrigerant has leaked. Keep this orifice clean to ensurethat any leaks are obvious.