Daikin VRV IV Series Manual de instalación - Página 9

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Daikin VRV IV Series Manual de instalación

• For information regarding the piping allowable maximum length, allowable height difference, and allow-

able length after a branch, refer to the installation manual that came with the outdoor unit or Engineering

Data Book.

• The refrigerant branch kit (sold separately) is required for piping branches. For information on how to

select a refrigerant branch kit, refer to the installation manual that came with the outdoor unit or Engi-

neering Data Book.

5-2 Protection against contamination when installing pipes

Protect the piping to prevent moisture, dirt, dust, etc. from entering the piping.

Place

Installation period

More than a month

Outdoor

Less than a month

Indoor

Regardless of the period

NOTE

Exercise special caution to prevent dirt or dust when passing piping through holes in walls and when pass-

ing pipe edges to the exterior.

5-3 Pipe connection work precautions

• When brazing refrigerant piping, begin working after replacing the nitrogen (*1) or perform brazing while

nitrogen is flowing in the refrigerant piping (*2) (refer to Fig. 5).

(*1) For details on nitrogen replacement, see the "VRV Installation Manual" (available at any Daikin

dealer).

(*2) The pressure regulator for the nitrogen released when doing the brazing should be set to about

2.9 psi (0.02 MPa) (enough to feel a slight breeze on your cheek).

NOTE

• Do not use an anti-oxidizing agent when brazing the piping. Residual debris could clog the piping or

cause parts to malfunction.

• Do not use a flux when brazing the refrigerant pipe joints.

Using a chlorine flux may cause the pipes to corrode, and if it contains fluoride it may cause the refriger-

ant lubricant to deteriorate, adversely affecting the refrigerant piping system.

Use phosphor copper brazing (B-Cu93P-710/795: ISO 3677) which does not require flux.

5-4 Pipe size selection

From Example of connection 1 and 2 below and Table 3, 4 and 5 select the piping size between the out-

door unit (refrigerant branch kit) and Branch Selector unit, and between the Branch Selector unit and the

indoor unit (refrigerant branch kit).

3P405106-10 English

Pressure-reducing valve

Part to be brazed

Taping

Nitrogen

Refrigerant piping

Fig. 5

Protection method

Pinch the pipe

Pinch or tape the pipe

Nitrogen

Valve