Daikin RZQ24MVJU Installation Manual

Contents

Daikin RZQ24MVJU Installation Manual Manual pdf 10 page image

10[Measures to prevent invasion of small creatures and litter]• Block all gaps in the piping penetration areas with putty or heat insu-lating material (arranged in the local field) as shown in the figurebelow.(If small creatures, such as insects, or litter, enters the outdoor unit,a short-circuit may be caused inside the electric parts box.)6-5 Heat insulation of piping• Make sure to insulate the field pipings (on both the liquid line and gasline) and refrigerant branching kit.(If they are not insulated, water leakage may be caused.)(The maximum temperature of the piping on the gas line is about248 °F during heating operation. Use an insulation sufficiently resis-tant to this temperature.)• Reinforce the refrigerant piping according to the installation environ-ment. If it is not reinforced, condensate may form on the surface ofthe insulation.WARNING• Make sure to insulate the field piping up to the piping connectionarea inside the unit. If the piping is exposed, dew condensation andburn by contact may be caused.6-6 Airtight test and vacuum dryingThe unit has been checked for leaks by the manufacturer.Confirm that the valves are firmly closed before airtight test or vacuum-drying.To prevent entry of any impurities and insure sufficient pressure resis-tance, always use the special tools dedicated for R410A.Perform the following inspections securely after the piping work.• Airtight test - Make sure to use nitrogen gas. (For the service portposition, refer to the figure in “Stop valve operation method”.)[Procedure] Pressurize the air conditioner from the liquid pipe andgas pipe up to 450 psi (Make sure not to exceed 450 psi). When thepressure does not drop for 24 hours, the piping work shall beaccepted.If the pressure drops, check for leakage positions. (Confirm thatthere is no leakage, then release nitrogen.)• Vacuum drying - Use a vacuum pump which can evacuate up to–14.6 psi or less.[Procedure] Operate the vacuum pump for evacuation for 2 hours ormore using both liquid pipe and gas pipe until the vacuum pressurereaches –14.6 psi or less. Leave the air conditioner at –14.6 psi orless for 1 hour or more, and confirm that the vacuum pressure indi-cated by the vacuum gage does not increase.(If the vacuum pressure increases, the system may contain moistureor have leakage.)If there is a possibility of moisture remaining in the piping (forexample, when there is a possibility of dew condensation inside the pip-ing because the piping work was performed in the rainy season or overa long period of time, or when rainwater may have entered the pipingduring the work)Perform evacuation described above for 2 hours (vacuum drying), pres-surize the air conditioner up to 7 psi (vacuum break) with nitrogen gas,then evacuate the air conditioner using the vacuum pump for 1 hour toachieve –14.6 psi or less (vacuum drying).(If the vacuum pressure does not reach –14.6 psi or less even afterevacuation for 2 hours or more, repeat vacuum break and vacuum dry-ing.) Leave the air conditioner in the vacuum status for 1 hour or more,and confirm that the vacuum pressuree indicated by the vacuum gaugedoes not increase.6-7 Additional refrigerant chargeWARNING• To avoid injury always use protective gloves and eye protectionwhen charging refrigerant.• To avoid injury do not charge with unsuitable substances. Use onlythe appropriate refrigerant.NOTE• Refrigerant cannot be charged until field wiring has been completed.Refrigerant may only be charged after performing the airtight testand the vacuum drying (see above).When charging refrigerant into the system, take care that its maxi-mum allowable charge is never exceeded, in view of the danger ofliquid hammer.Refrigerant containers shall be opened slowly.To avoid compressor breakdown, do not charge the refrigerant morethan the specifed amount to raise the condensing pressure.• This outdoor unit is factory charged with refrigerant.• Charge the additional refrigerant calculated by the formula below.Record the additional amount to the label sticked on the back of frontpanel.• Charge the refrigerant to the liquid pipe in its liquid state. Since R410Ais a mixed refrigerant, its composition changes if charged in a state ofgas and normal system operation would no longer be assured.• Before filling, check whether the tank has a siphon attached or not.How to fill a tank with a siphon attached.Other ways of filling the tank• Determine the amount of refrigerant to be added by referring to thetable in “6-6 Example of connection”, write it down on the labelsticked on the back side of the front cover.• After the vacuum drying is finished, charge the additional refrigerantin its liquid state through the liquid stop valve service port.Taking into account following instructions:1. Check that gas and liquid stop valves are closed.2. Charge the specified amount of refrigerant.• If the outdoor unit is not in operation and the total amount cannot becharged, follow the procedures for additional refrigerant chargeshown below.• Make sure to use installation tools you exclusively use on R410Ainstallations to withstand the pressure and to prevent foreign mate-rials from mixing into the system.• Procedures for charging additional refrigerant.Putty or heatinsulating material(arranged in local field)Additional charging amount = Liquid piping length × 0.036(lb.) (ft.)×0.036There is a siphon tubeinside, so there is no needto turn the tank upside-down.Fill with the tank upright.Fill with the tank upside-down.NitrogenDotted linesrepresentfield pipingCylinderStop valve service portVacuum pumpWeighing scale Charge hoseR410APressurereducingvalve Outdoor unitIndoor unitsLiquid line Gas line(Siphon system) Valve A