Daikin RZQ45KCVJK [14/64] 2 installation tools

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Precautions when re-using pre-existing refrigerant piping

• Abide by the following when re-using pre-existing refrigerant piping. Any problems with the piping may lead

to malfunctioning.

• In the following cases, do not re-use piping, but rather lay new piping.

· If indoor or outdoor units have been disconnected from the piping for a long time (as water and foreign

matter might have entered the piping).

· If copper piping is corroded.

• Flares should be redone and not re-used, in order to prevent refrigerant leaks.

any impurities.

6-3 SELECTING PIPING MATERIALS

Use the piping whose inside and outside are clean and with no harmful substances for use such as sulphur,

oxide, dust, dust from cutting, grease, or liquid (contamination) is attached.

For the refrigerant piping, use the following material.

Material: Deoxidised phosphorous seamless copper pipe

Thickness and size: Decide based on section 6-5 REFRIGERANT PIPE SIZE AND ALLOWABLE PIPE

LENGTH.

For the handling of the stop valves, refer to “Precautions when the handling piping stop valves” in section

6-6 REFRIGERANT PIPING WORK.

Protect the piping and prevent liquid, dirt and dust from entering into the piping.

Pay special attention when running the copper pipe through the through-hole or when leading the edge of the

pipe outside the room.

Manifold gauge

Charging hose

Vacuum pump