Daikin ERX125A7W1B Installation Manual

Contents

Daikin ERX125A7W1B Installation Manual Manual pdf 10 page image

Installation manual6 ERX125~250A7W1BInverter condensing unit4PW30064-1D4.2 How to calculate the additional refrigerant to be chargedAdditional refrigerant to be charged R (kg)R should be rounded off in units of 0.1 kgDetermine the weight of refrigerant to be charged additionallyreferring to the item "Additional refrigerant charge" on page 12and fill in the amount on the wiring diagram attached to the unit.4.3 Diameters6.5. Protection against contamination wheninstalling pipes- Take measures to prevent foreign materials like moisture andcontamination from mixing into the system.- Great caution is needed when passing copper tubes throughwalls.- Block all gaps in the holes for passing out piping and wiringusing sealing material (field supply). (The capacity of the unitwill drop and small animals may enter the machine.)Example: passing piping out through the front7. LEAK TEST AND VACUUM DRYINGThe units were checked for leaks by the manufacturer.After connecting the field piping, perform the following inspections.1 PreparationsReferring to figure 11, connect a nitrogen tank, a cooling tank,and a vacuum pump to the outdoor unit and perform theairtightness test and the vacuum drying. The stop valve andvalves A and B in figure 11 should be open and closed as shownin the table below when performing the airtightness test andvacuum drying.2 Airtightness test and vacuum drying■ Airtightness test: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.R= (Total length (m) of liquid piping size at Ø9.5) x0.059Outdoor unit typePiping size (mm)Gas Liquid125 Ø15.9 Ø9.5200 Ø19.1 Ø9.5250 Ø22.2 Ø9.5Installation period Protection methodMore than a month Pinch the pipeLess than a month Pinch or tape the pipeRegardless of the periodAfter all the piping has been connected, make sure there isno gas leak. Use nitrogen to perform a gas leak check.1 2 31 Plug the areas marked with " ".(When the piping is routed from thefront panel.)2 Gas side piping3 Liquid side piping1 Pressure reducing valve2 Nitrogen3 Measuring instrument4 Tank (siphon system)5 Vacuum pump6 Charge hose7 Service port for adding refrigerant8 Gas line stop valve9 Liquid line stop valve10 Outdoor unit11 To air handling unit evaporator12 Stop valve service port13 Dotted lines represent on site piping14 Valve B15 Valve C16 Valve AStateof the valves A and Band the stop valveValveAValveBValveCLiquidsidestopvalveGassidestopvalvePerforming theairtightness test andvacuum drying(Valve A must always beshut. Otherwise therefrigerant in the unit willpour out.)Close Open Open Close CloseNOTE Make sure to perform airtightnesstest and vacuum drying using theservice ports of the stop valves of theliquid side and of the gas side.(For the service port location, refer tothe "Caution" label attached on thefront panel of the outdoor unit.)■ See "11.3. Stop valve operation procedure" onpage 11 for details on handling the stop valve.■ To prevent entry of any contamination and toprevent insufficient pressure resistance, alwaysuse the special tools dedicated for working withR410A refrigerant.NOTE Make sure to use nitrogen gas.