Daikin RZQG71L8V1B Installation Manual

Daikin RZQG71L8V1B Installation Manual Manual pdf 13 page image

RZQG71~140L + RZQSG100~140LSplit system air conditioners4P339538-1A – 2014.03Installation manual10 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.1 Torque wrench2 Spanner3 Piping union4 Flare nutNot recommended, but in case of emergencyShould you be forced to connect the piping without a torquewrench, follow the following installation method: Tighten the flare nut using a spanner until the tighteningtorque suddenly increases. From that position further tighten the flare nut to the anglelisted below:9.2. Brazing guidelines Make sure to blow through with nitrogen when brazing.Blowing through with nitrogen prevents the creation of largequantities of oxidized film on the inside of the piping. An oxidizedfilm adversely affects valves and compressors in therefrigerating system and prevents proper operation. The nitrogen pressure should be set to 0.02 MPa (i.e., justenough so it can be felt on the skin) with a pressure-reducingvalve.1 Refrigerant piping2 Part to be brazed3 Taping4 Manual valve5 Pressure-reducing valve6 Nitrogen Do not use anti-oxidants when brazing the pipe joints.Residue can clog pipes and break equipment. 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. Stop valve operationCautions on 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. The stop valve is factory closed. Do not apply excessive force to the valve stem. Doing so maybreak the valve body. Since the stop valve attachment 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 stem cap, as this could cause arefrigerant leak. When it is expected that the operating pressure will be low (forexample, when cooling will be performed while the outside airtemperature is low), sufficiently seal the flare nut in the stopvalve on the gas line with silicon sealant to prevent freezing.Opening/closing the stop valveOpening the stop valve1. Remove the valve cover.2. Insert a hexagon wrench (liquid side: 4 mm/gas side: 6 mm) intothe valve stem and turn the valve stem counterclockwise.3. When the valve stem cannot be turned any further, stop turning.The valve is now open.Closing the stop valve1. Remove the valve cover.2. Insert a hexagon wrench (liquid side: 4 mm/gas side: 6 mm) intothe valve stem and turn the valve stem clockwise.3. When the valve stem cannot be turned any further, stop turning.The valve is now closed.Piping size(mm)Further tightening angle(degrees)Recommended arm lengthof spanner (mm)Ø6.4 60~90 150Ø9.5 200Ø12.7 30~60 250Ø15.9 300Ø19.1 20~35 450124 31 543266Silicon sealant(Make sure there is no gap)Closing directionLiquid side Gas side12341 Service port and service port cap2 Valve stem3 Field piping connection4 Stem cap121 Spanner2 Torque wrench