Daikin RXYSQ4P8V1B Installation Manual

Installation manual14 RXYSQ4~6P8V1B+Y1BVRVIII-S System air conditioner4PW68122-1 – 02.20119.9. Leak test and vacuum dryingThe units were checked for leaks by the manufacturer.See figure 6 or figure 7 and refer to "9.10. Additional refrigerantcharge" on page 14 for nomenclature of the parts in figure 6 orfigure 7.■ Confirm that the gas and liquid line stop valves are firmly closedbefore pressure test or vacuuming.■ Make sure that valve A is completely open.Air tight test and vacuum drying■ Air tight test: Make sure to use nitrogen gas. (For the serviceport position, refer to "9.2. Cautions for handling stop valve" onpage 9.■ Pressurize the liquid and gas pipes to 4.0 MPa (40 bar) (do notpressurize more than 4.0 MPa (40 bar)). If the pressure does notdrop within 24 hours, the system passes the test. If the pressuredrops, check where the nitrogen leaks from.■ Vacuum drying: Use a vacuum pump which can evacuate to–100.7 kPa (5 Torr, –755 mm Hg)1. Evacuate the system from the liquid and gas pipes by using avacuum pump for more than 2 hours and bring the system to–100.7 kPa. After keeping the system under that condition formore than 1 hour, check if the vacuum gauge rises or not. If itrises, the system may either contain moisture inside or haveleaks.2. Following should be executed if there is a possibility of moistureremaining inside the pipe (if piping work is carried out during theraining season or over a long period of time, rainwater may enterthe pipe during work).After evacuating the system for 2 hours, pressurize the systemto 0.05 MPa (vacuum break) with nitrogen gas and evacuate thesystem again using the vacuum pump for 1 hour to –100.7 kPa(vacuum drying). If the system cannot be evacuated to–100.7 kPa within 2 hours, repeat the operation of vacuumbreak and vacuum drying.Then, after leaving the system in vacuum for 1 hour, confirm thatthe vacuum gauge does not rise.9.10. Additional refrigerant chargeSee figure 6 for Sky Air or room air conditioner applications orfigure 7 for VRV applications.To avoid compressor breakdown. Do not charge the refrigerantmore than the specified amount.■ This outdoor unit is factory charged with refrigerant anddepending on pipe sizes and pipe lengths some systems requireadditional charging of refrigerant. See "How to calculate theadditional refrigerant to be charged" on page 12 for Sky Air orroom air conditioner applications or "How to calculate theadditional refrigerant to be charged" on page 13 for VRV indoorunits.■ In case re-charge is required, refer to the nameplate of the unit.The nameplate states the type of refrigerant and necessaryamount.Precautions when adding R410ABe sure to charge the specified amount of refrigerant in liquid state tothe liquid pipe.Since this refrigerant is a mixed refrigerant, adding it in gas form maycause the refrigerant composition to change, preventing normaloperation.■ Before charging, check whether the refrigerant cylinder isequipped with a siphon tube or not.9.11. Important information regarding therefrigerant usedThis product contains fluorinated greenhouse gases covered by theKyoto Protocol. Do not vent gases into the atmosphere.Refrigerant type: R410AGWP (1) value: 1975(1) GWP = global warming potentialPlease fill in with indelible ink,■ ➀ the factory refrigerant charge of the product,■ ➁ the additional refrigerant amount charged in the field and■ ➀+➁ the total refrigerant chargeon the fluorinated greenhouse gases label supplied with the product.■ Refrigerant cannot be charged until field wiring hasbeen completed.■ Refrigerant may only be charged after performing theleak test and the vacuum drying (see above).■ When charging a system, care shall be taken that itsmaximum permissible charge is never exceeded, inview of the danger of liquid hammer.■ Charging with an unsuitable substance may causeexplosions and accidents, so always ensure that theappropriate refrigerant (R410A) is charged.■ Refrigerant containers shall be opened slowly.■ Always use protective gloves and protect your eyeswhen charging refrigerant.■ When performing service on the unit requiring therefrigerant system to be opened, refrigerant must beevacuated according to local regulations.■ Do not use the automatic refrigerant charging functionwhile working on the indoor units.When using the automatic refrigerant chargingfunction, the indoor units operate automatically aswell as the outdoor unit.■ When the power is on, please close the frontpanel when leaving the unit.1 Pressure reducing valve2 Nitrogen3 Tank4 Siphon system5 Measuring instrument6 Vacuum pump7 Valve A8 Gas line stop valve9 Outdoor unit10 Liquid line stop valve11 Indoor unit12 Stop valve service port13 Charge hose14 BP unit (for Sky Air or room air conditioner indoor units only)Charge the liquidrefrigerant with the cylinderin upright position.Charge the liquidrefrigerant with the cylinderin up-side-down position.