Daikin RMXS48LVJU Installation Manual

Also see for RMXS48LVJU: Service manual Service manual

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Daikin RMXS48LVJU Installation Manual Manual pdf 12 page image

11 English7-8 Air tight test and vacuum dryingAfter doing the piping, perform the following inspections.Be sure to use nitrogen gas. (See the figure (“Stop valve operationprocedure”) for the location of the service port.)[Procedure]Pressurize from the liquid pipes and gas pipes to 478 PSI (3.3 MPa)(and not above 478 PSI (3.3 MPa)). If there is not pressure drop overthe next 24 hours, the equipment has passed the test.If the pressure drops, check for leakage positions. (Confirm that thereis no leakage, then release nitrogen.)Use a vacuum pump that can create a vacuum down to at least–14.6 PSI (–100.7 kPa).[Procedure]Operate the vacuum pump for at least 2 hours from both the liquidand gas pipes and decrease the pressure to at least –14.6 PSI(–100.7 kPa).Leave at below –14.6 PSI (–100.7 kPa) for at least 1 hour and makesure that the vacuum gauge does not rise. (If it does rise, there iseither still moisture in the system or a leak.)Cases where moisture might enter the piping (i.e., if doing workduring the rainy season, if the actual work takes long enough thatcondensation may form on the inside of the pipes, if rain might enterthe pipes during work, etc.)After performing the vacuum drying for 2 hours, pressurize to7.2 PSI (0.05 MPa) (i.e., vacuum breakdown) with nitrogen gas, thendepressurize down to at least –14.6 PSI (–100.7 kPa) for an hourusing the vacuum pump (vacuum drying). (If the pressure does notreach at least –14.6 PSI (–100.7 kPa) even after depressurizing for atleast 2 hours, repeat the vacuum breakdown - vacuum drying pro-cess.) Leave as a vacuum for 1 hour after that, and make sure thevacuum gauge does not rise.(Refer to figure 27)1. Nitrogen2. Decompression valve3. Vacuum pump4. Valve (open)5. Charge hose6. Stop valve service port7. Indoor unit8. Gas line stop valve (close)9. Liquid line stop valve (close)10. Indicates local procurement11. Outdoor unit12. BP unitNoteThe stop valve must always be turned to “closed”.Otherwise the refrigerant in the outdoor unit will pour out.• The names of parts needed to operate the stop valve are shownin the figure below. The unit is shipped from the factory with thestop valve turned to the “closed” position.• Since the side boards may be deformed if only a torque wrench isused when loosening or tightening flare nuts, always lock the stopvalve with a wrench and then use a torque wrench.• In cases where the unit is run in heating mode when the outsidetemperature is low or in other situations where the operating pres-sure might drop, seal the gas-side flare nut on the stop valve withsilicon sealant or the like to prevent it from freezing.Stop valve operation procedureHave a hexagonal wrench ready (size: 0.2 inch and 0.3 inch / 4 mmand 6 mm).Opening the valve1. Place the hexagonal wrench on the valve bar and turn counter-clockwise.2. Stop when the valve bar no longer turns. It is now open.Close the valve1. Place the hexagonal wrench on the valve bar and turn clockwise.2. Stop when the valve bar no longer turns. It is now closed.• A seal is attached to the point indicated by the arrow.Take care not to damage it.• Be sure to tighten the valve lid securely after operating the valves.• Use a push-rod-provided charging hose for operation.• Be sure to tighten the valve lid securely after operation.Tightening torque .......... 8.5-10.3 ft·lbf (11.5-14.0 N·m)Air tight testVacuum dryingStop valve operation procedurePrecautions when handling the stop valveServicing portValve barValve lidInter-unit piping connectionPrecautions for handling valve lidLiquid-side tightening torque Gas-side tightening torque10.0-12.2 ft·lbf(13.5-16.5 N·m)16.6-20.3 ft·lbf(22.5-27.5 N·m)Precautions for handling servicing portSilicon sealing pad(Make sure that there is no gap)Direction to open Direction to openValve lidStop valve(lid attachment)