Daikin RXQ18P7W1BA Installation Manual download pdf (Page 11)

RX(Y)Q5-10-12P7W1B + RXQ8P7W1B + RXYQ8P8W1B +

RXYHQ12P8W1B + RX(Y)Q14~18P7W1BA

VRVIII System air conditioner

4PW48461-1

Installation manual

■ The pipe thickness of the refrigerant piping should comply

with relevant local and national regulations. The minimal pipe

thickness for R410A piping must be in accordance with the

table below.

3. Make sure to use the particular branches of piping that have

been selected referring to chapter "6.6. Example of connection"

on page 9.

4. In case the required pipe sizes (inch sizes) are not available, it is

also allowed to use other diameters (mm sizes), taken the

following into account:

■ select the pipe size nearest to the required size.

■ use the suitable adapters for the change-over from inch to

mm pipes (ﬁeld supply).

5. Precautions when selecting branch piping

When the equivalent pipe length between outdoor and indoor

units is 90 m or more, the size of the main pipes (both gas side

and liquid side) must be increased.

Depending on the length of the piping, the capacity may drop,

but even in such a case it is possible to increase the size of the

main pipes. Refer to page 10. If the recommended pipe size is

not available, stick to the original pipe diameter (which may

result in a small capacity decrease).

6.3. Pipe connection

Be sure to perform a nitrogen blow when brazing and to read the

paragraph "Caution to be taken when brazing refrigerant piping" on

page 5 ﬁrst.

6.4. Connecting the refrigerant piping

1Front connection or side connection

Installation of refrigerant piping is possible as front connection or

side connection (when taken out from the bottom) as shown in

the ﬁgure.

2 Removing the pinched piping

When connecting refrigerant piping to the outdoor unit, ﬁrst

remove the pinched piping. Do not vent gases into the

atmosphere.

Removing of the pinched piping must be carried out according to

the following procedure:

1. Make sure the stop valves are closed.

2. Connect a charge hose to the service ports of all stop

valves.

3. Recover the gas from the pinched piping.

4. When all the gas is recovered from the pinched piping,

dissolve the brazing using a burner and remove the

pinched piping.

See ﬁgure 6.

Pipe Ø

Minimal thickness

t (mm)

Pipe Ø

Minimal thickness

t (mm)

6.4 0.80 22.2 0.80

9.5 0.80 28.6 0.99

12.7 0.80 34.9 1.21

15.9 0.99 41.3 1.43

19.1 0.80

NOTE

The pressure regulator for the nitrogen released when

doing the brazing should be set to 0.02 MPa or less.

(See ﬁgure 10)

Do not use anti-oxidants when brazing the pipe joints.

Residue can clog pipes and break equipment.

1 Refrigerant piping

2 Location to be brazed

3 Nitrogen

4 Taping

5 Manual valve

6 Regulator

7 Nitrogen

1 Left-side connection

2 Front connection

3 Right-side connection

NOTE

Precautions when knocking out knock holes

■ Be sure to avoid damaging the casing

■ After knocking out the holes, we recommend you

remove the burrs and paint the edges and areas

around the edges using the repair paint to prevent

rusting.

■ When passing electrical wiring through the knock

holes, wrap the wiring with protective tape to

prevent damage.

Any gas remaining inside the stop valve may blow off

the pinched piping, causing damage or injury.

1 Pinched piping

2 Stop valve

3 Service port

4 Point of melting the brazing metal

Precautions when connecting ﬁeld piping.

■ Perform brazing at the gas stop valve before

brazing at the liquid stop valve.

■ Add brazing material as shown in the ﬁgure.

12 3

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 37 38

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Daikin RXQ18P7W1BA Installation Manual Page 11

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