Daikin RXYSQ4M7V3B Installation Manual

Also see for RXYSQ4M7V3B: Operation manual

Contents

Installation manual10 RXYSQ4~6M7V3BVRVII-S system air conditioner4PW17806-1C9.7. Leak test and vacuum dryingThe units were checked for leaks by the manufacturer.See figure 6 and refer to "Additional refrigerant charge" on page 10for nomenclature of the parts in figure 6.• 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 7.■ Pressurize the liquid and gas pipes to 3.8 MPa (38 bar) (do notpressurize more than 3.8 MPa (38 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 system to0.05 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 kPawithin 2 hours, repeat the operation of vacuum break and vacuumdrying.Then, after leaving the system in vacuum for 1 hour, confirm thatthe vacuum gauge does not rise.9.8. Additional refrigerant chargeSee figure 6.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 9.■ Make sure to use installation tools you exclusively use onR-410A installations to withstand the pressure and to preventforeign materials from mixing into the system.■ Charge the refrigerant to the liquid pipe in its liquid state. SinceR-410A is a mixed refrigerant, its composition changes ifcharged in a state of gas and normal system operation would nolonger be assured.■ Before filling, check whether the tank has a siphon attached ornot.■ Determine the weight of refrigerant to be charged additionallyreferring to the item "Additional refrigerant charge" in "How tocalculate the additional refrigerant to be charged" on page 9.and fill in the amount in the "Additional refrigerant charge label"attached to the unit.Charging while the outdoor unit is at standstill■ After the vacuum drying is finished, charge the additionalrefrigerant in its liquid state through the liquid stop valve serviceport taking into account following instructions:- Check that gas and liquid stop valves are closed.- Stop the compressor and charge the specified weight ofrefrigerant.Charging while the outdoor unit is operating1 Completely open the gas line stop valve.Valve A must be left fully closed. Make sure the liquid stop valveis totally shut. If it is open, the refrigerant cannot be charged.Charge the additional refrigerant in its liquid state through theservice port of the liquid line stop valve.2 While the unit is at standstill and under setting mode 2 (refer toChecks before initial start-up, "Setting the mode" on page 15),set the required function A (additional refrigerant chargingoperation) to (ON). Then operation starts. The blinking H2Pled indicates test operation and the remote controller indicates(test operation) and (external control).3 When the specified amount of refrigerant is charged, push thebutton. Then operation stops.■ The operation automatically stops within 30 minutes.■ If the refrigerant charge cannot be finished within 30 minutes,repeat step 2.■ If the operation stops immediately after restart, there is apossibility that the system is overcharged.The refrigerant cannot be charged more than this amount.4 After the refrigerant charge hose is removed, make sure to fullyopen the liquid stop valve. Otherwise the piping may burst due toblocked liquid.5 After the refrigerant is charged, turn on the power for the indoorunits and for the outdoor unit.Refrigerant cannot be charged until field wiring has beencompleted.Refrigerant may only be charged after performing the leaktest and the vacuum drying (see above).When charging a system, care shall be taken that itsmaximum permissible charge is never exceeded, in view ofthe danger of liquid hammer.Charging with an unsuitable substance may causeexplosions and accidents, so always ensure that theappropriate refrigerant (R-410A) is charged.Refrigerant containers shall be opened slowly.Always use protective gloves and protect your eyes whencharging refrigerant.1 Presssure reducing valve2 Nitrogen3 Tank4 Siphon system5 Measuring instrument6 Vacuum pomp7 Valve A8 Gas line stop valve9 Outdoor unit10 Liquid line stop valve11 Indoor unit12 Stop valve service port13 Charge hoseHow to fill a tank with a siphon attachedFill with the tank upright.There is a siphon tube inside, so there is noneed to turn the tank upside-down.Other ways of filling the tankFill with the tank upside-down.If the total refrigerant cannot be charged while the outdoorunit is at standstill, it is possible to charge the refrigerant byoperating the outdoor unit using the refrigerant chargefunction (refer to "Setting mode 2" on page 15).ONBS3 RETURN