Daikin RMXS48LVJU Installation Manual

Also see for RMXS48LVJU: Service manual Service manual

Contents

Daikin RMXS48LVJU Installation Manual Manual pdf 13 page image

English 128. ADDITIONAL REFRIGERANT CHARGEWARNING• When leaving the unit with the power on, be sure toswitch with another person doing the installation orclose the front panel.8-1 Before adding refrigerant• Make sure the following work and inspection is complete, inaccordance with the installation manual.• Piping• Wiring• Airtightness test, Vacuum drying8-2 Checking the refrigerant tank• Check whether the tank has a siphon pipe before charging andplace the tank so that the refrigerant is charged in liquid form.(See the figure below.)8-3 Adding refrigerant1. Calculate the amount of refrigerant to add as described in “Calcu-lating the amount of refrigerant to add” in “7-7 Example of con-nection (page 10)”.2. After the vacuum drying is finished, open valve A and charge thecalculated amount of refrigerant through the service port for theliquid-side stop valve.3. Close valve A after charging is complete.Note:If all the refrigerant to be added cannot be charged using theabove procedure, right-hand the procedure below and re-charge the refrigerant.If all the refrigerant could not be addedAdd refrigerant using the following procedure. See the “Cautions onService” plate on the back of the front panel for details on the set-tings for adding refrigerant.[Procedure]1. Close the front panel and turn on the power to all outdoor unitsand indoor units in the refrigeration system.2. Open the gas and liquid-side stop valve all the way and add therefrigerant. (Open valve A immediately after starting the compres-sor.)3. Once the appropriate amount of refrigerant is in, press the confir-mation button (BS3) on the outdoor unit PC board (A2P), and stopoperation after adding the refrigerant.4. Close valve A after charging is complete.9. POST-WORK CHECKSPerform the following checks after work is complete.(1) Drain pipe connection, removal of transport clasp →See “5. PRECAUTIONS ON INSTALLATION (page 6)”.(2) Incorrect power supply wiring, loose screws →See “6-3 How to connect the power supply wiring (page 7)”.(3) Incorrect inter-unit wiring, loose screws →See “6-4 Inter-unit wiring connection procedure (page 8)”.(4) Incorrect refrigerant piping connections →See “7. PRECAUTIONS ON REFRIGERANT PIPING (page 8)”.(5) Piping sizes, use of insulation →See : “7-2 Selecting piping material (page 8)”.“7-6 Heat insulation of piping (page 9)”.(6) Stop valve check →Make sure both the liquid-side and gas-side stop valves areopen.(7) Record of Amount of Refrigerant Added →Record it on “Recording the additionally charged refrigerantquantity” on the “Cautions on Service” plate.(8) Measuring the insulation of the main power circuit →• Use a 500V mega-tester.• Do not use the mega-tester for weak currents other than 208/230V. (Inter-unit wiring)CAUTIONTo the pipe-layerAfter completing installation, be sure to open the valve.(Operating the unit with the valve shut will break the compressor.)Filling after calculating the amount of refrigerant to addStatus of the stop valve and other valves when adding refrigerant• See “Stop valve operation procedure” in “7-8 Air tight test andvacuum drying (page 11)” for details on how to use the stop valve.(Refer to figure 28)1. R410A Tank (Siphon system) 5. Stop valve service port2. Measuring instrument 6. Gas line stop valve3. Valve A 7.Outdoor unit4. BP unit 8.Liquid line stop valveState of valve A and the stopvalve Valve A Liquid linestop valveGas linestop valveBefore starting to charge therefrigerant Close Close CloseDuring charging of the refrig-erant Open Close CloseLocation of “Cautions on Service” plate.The back of front panelFront panelTank with siphon pipe Other tanksThere is a siphonpipe inside, so thecylinder need not beupside-down to fillwith liquid.(Stand the cylinderupright when filling.)Stand the tankupside down andcharge.Status of the stop valve and other valves when adding refrigerantoperation• See “Stop valve operation procedure” in “7-8 Air tight test andvacuum drying (page 11)” for details on how to use the stopvalve.• Connect the service port (for charging refrigerant) inside theunit. When the unit is shipped from the factory, refrigerant isalready charged, so be careful when connecting the chargehose.• After adding the refrigerant, do not forget to close the lid of theservice port (for adding refrigerant). The tightening torque of thelid is 8.5-10.3 ft·lbf (11.5-14.0 N·m)(Refer to figure 29)1. Gas line stop valve 2. Liquid line stop valve3. Stop valve service port 4. BP unit5. Measuring instrument 6. R410A Tank (Siphonsystem)7. Valve A 8. Service port9.(For adding refrigerant) 10.Outdoor unitState of valve A and the stopvalve Valve A Liquid linestop valveGas linestop valveBefore starting to charge therefrigerant Close Open OpenDuring charging of the refrig-erant Open Open Open