INSTALLATION MANUAL - Daikin AC

■■Do not use flux when brazing copper-to-copper refrigerantpiping. Use phosphor copper brazing filler alloy (BCuP) whichdoes not require flux.Flux has an extremely harmful influence on refrigerant pipingsystems. For instance, if chlorine based flux is used, it will causepipe corrosion or, in particular, if the flux contains fluorine, it willdeteriorate the refrigerant oil.9.3. Guidelines for handling the stop valveCautions for handling the stop valve■■Make sure to keep both stop valves open during operation.The figure below shows the name of each part required inhandling the stop valve.9.2. Guidelines for flare connection■■■■CAUTION■ Do not use mineral oil on flared part.Mineral oil getting into the system would reduce thelifetime of the units.■ Incomplete flaring may cause refrigerant gas leakage.Flares should not be re-used. New ones should be made inorder to prevent leaks.Use a pipe cutter and annealed flare tool suitable for therefrigerant used.Only use the annealed flare nuts included with the unit. Usingdifferent flare nuts may cause the refrigerant to leak.Please refer to the table for flaring dimensions and tighteningtorques (too much tightening will result in splitting the flare).■■1234The stop valve is factory closed.1 Service port and service port cover2 Stop valve3 Field piping connection4 Stop valve coverDo not apply excessive force to the stop valve. Doing so maybreak the valve body.Since the stop valve mounting plate may be deformed if only atorque wrench is used to loosen or tighten the flare nut, alwaysmake sure to secure the stop valve with a spanner, then loosenor tighten the flare nut with a torque wrench.Do not place the spanner on the stop valve cover, as this couldcause a refrigerant leak.Piping sizeTighteningtorqueFlaredimensions AFlare shape(mm)1/4 inch(Ø6.4 mm)5/8 inch(Ø15.9 mm)11.06~12.54 lbs•ft(15~17 N•m)46.47~55.32 lbs•ft(63~75 N•m)0.34~0.36 inch(8.7~9.1 mm)0.76~0.78 inch(19.3~19.7 mm)90 ±2A45 ±2R=0.02~0.04 inch(=0.4~0.8 mm)1 Spanner12■When connecting the flare nut, coat the flare inner surface withether oil or with ester oil and initially tighten 3 or 4 turns by handbefore tightening firmly.■2 Torque wrenchThe operating pressure at the refrigerant side can be low,sufficiently seal the flare nut in the stop valve on the gas line withsilicon sealant to prevent freezing.■■■After all piping has been connected, use nitrogen to perform agas leak check.When loosening a flare nut, always use two wrenches together.When connecting the piping, always use a spanner and torquewrench together to tighten the flare nut to prevent flare nutcracking and leaks.14321 Torque wrench2 Spanner3 Piping union4 Flare nutAfter the work is finished, make sure to check that there is nogas leak.How to use the stop valveSilicon sealant(Make sure there is no gap)■ Opening the stop valve1. Remove the stop valve cover.2. Insert a hexagon wrench (0.15 inch [close to 5/32 inch] (4 mm))into the stop valve and turn the stop valve counter clockwise.3. When the stop valve cannot be turned any further, stop turning.The valve is now open.■ Closing the stop valve1. Remove the stop valve cover.2. Insert a hexagon wrench (0.15 inch [close to 5/32 inch] (4 mm))into the stop valve and turn the stop valve clockwise.3. When the stop valve cannot be turned any further, stop turning.The valve is now closed.Closing directionLiquid sideGas sideERLQ018~030BAVJUOutdoor unit for air to water heat pump4PW62590-1 – 07.2010Installation manual8