Daikin AZQS100B8V1B Installer's Reference Manual

Also see for AZQS100B7Y1B: Installer's reference guide Installation manual Installation manual Installer's reference guide

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6 InstallationInstaller reference guide12AZQS100~140B8V1B + AZQS100~140B7Y1BSplit system air conditioners4P3855291 – 2014.08Conventional flare toolFlare tool forR410A (clutchtype)Clutch type(Ridgidtype)Wing nut type(Imperialtype)A 0~0.5 mm 1.0~1.5 mm 1.5~2.0 mm5 Check that the flaring is properly made.a bca Flare’s inner surface must be flawless.b The pipe end must be evenly flared in a perfect circle.c Make sure the flare nut is lifted.6.4.6 To braze the pipe endThe indoor unit and outdoor unit have flare connections. Connectboth ends without brazing. If brazing should be needed, take thefollowing into account:▪ When brazing, blow through with nitrogen to prevent creation oflarge quantities of oxidised film on the inside of the piping. Thisfilm adversely affects valves and compressors in the refrigeratingsystem and prevents proper operation.▪ Set the nitrogen pressure to 20 kPa (just enough so it can be felton the skin) with a pressurereducing valve.a b c d effa Refrigerant pipingb Part to be brazedc Tapingd Manual valvee Pressurereducing valvef Nitrogen▪ Do NOT use antioxidants when brazing pipe joints.Residue can clog pipes and break equipment.▪ Do NOT use flux when brazing coppertocopper 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.6.4.7 Using the stop valve and service portTo handle the stop valveTake the following guidelines into account:▪ The stop valves are factory closed.▪ The following illustration shows each part required in handling thevalve.cdaba Service port and service port capb Valve stemc Field piping connectiond Stem cap▪ Keep both stop valves open during operation.▪ Do NOT apply excessive force to the valve stem. Doing so maybreak the valve body.▪ Always make sure to secure the stop valve with a spanner, thenloosen or tighten the flare nut with a torque wrench. Do NOT placethe spanner on the stem cap, as this could cause a refrigerantleak.aba Spannerb Torque wrench▪ When it is expected that the operating pressure will be low (e.g.when cooling will be performed while the outside air temperatureis low), sufficiently seal the flare nut in the stop valve on the gasline with silicon sealant to prevent freezing.Silicon sealant, make sure there is no gap.To open/close the stop valve1 Remove the valve cover.2 Insert a hexagon wrench (liquid side: 4 mm, gas side: 6 mm)into the valve stem and turn the valve stem:Counterclockwise to open.Clockwise to close.3 When the valve stem cannot be turned any further, stop turning.The valve is now opened/closed.To handle the stem capTake the following guidelines into account:▪ The stem cap is sealed where indicated with the arrow. Do NOTdamage it.▪ After handling the stop valve, make sure to tighten the stem capsecurely.▪ For the tightening torque, refer to the following table.▪ Check for refrigerant leaks after tightening the stem cap.Item Tightening torque (N∙m)Stem cap, liquid side 13.5~16.5Stem cap, gas side 22.5~27.5Service port cap 11.5~13.9