Daikin RZAG71L7V1B Reference Manual

Also see for RZAG100L7V1B: Service manual

Daikin RZAG71L7V1B Reference Manual Manual pdf 14 page image

6 InstallationInstaller reference guide14RZAG71~140L7V1BSplit system air conditioners4P418663-1 – 2016.02▪ Set the nitrogen pressure to 20 kPa (just enough so it can be felton the skin) with a pressure-reducing valve.a b c d effa Refrigerant pipingb Part to be brazedc Tapingd Manual valvee Pressure-reducing valvef Nitrogen▪ Do NOT use anti-oxidants when brazing 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.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 11.5~13.9To handle the service capTake the following guidelines into account:▪ Always use a charge hose equipped with a valve depressor pin,since the service port is a Schrader type valve.▪ After handling the service port, tighten the service port capsecurely. For the tightening torque, refer to the table in chapter"To handle the stem cap" on page 14.▪ Check for refrigerant leaks after tightening the service port cap.6.4.8 To connect the refrigerant piping to theoutdoor unit▪ Piping length. Keep field piping as short as possible.▪ Piping protection. Protect the field piping against physicaldamage.1 Do the following:▪ Remove the service cover (a) with screw (b).▪ Remove the piping intake plate (c) with screw (d).cabd2 Choose a piping route (a, b, c or d).