Daikin R410A Split Series Installation Manual download pdf (Page 11)

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Refrigerant Piping Work

Refrigerant piping work

Cautions on pipe handling

1) Protect the open end of the pipe against dust and moisture.

2) All pipe bends should be as gentle as possible. Use a pipe bender for

bending. (Bending radius should be 30 to 40mm or larger.)

Selection of copper and heat insulation materials

When using commercial copper pipes and fittings, observe the following:

1) Insulation material: Polyethylene foam

Heat transfer rate: 0.041 to 0.052W/mK (0.035 to 0.045kcal/mh°C)

Refrigerant gas pipe’s surface temperature reaches 110°C max.

Choose heat insulation materials that will withstand this temperature.

2) Be sure to insulate both the gas and liquid piping and to provide insulation dimen-

sions as below.

3) Use separate thermal insulation pipes for gas and liquid refrigerant pipes.

Flaring the pipe end

1) Cut the pipe end with a pipe cutter.

2) Remove burrs with the cut surface facing down-

ward so that the chips do not enter the pipe.

3) Put the flare nut on the pipe.

4) Flare the pipe.

5) Check that the flaring is properly made.

WARNING

1) Do not use mineral oil on flared part.

2) Prevent mineral oil from getting into the system as this would reduce the lifetime of the units.

3) Never use piping which has been used for previous installations. Only use parts which are delivered with the unit.

4) Do never install a drier to this R410A unit in order to guarantee its lifetime.

5) The drying material may dissolve and damage the system.

6) Incomplete flaring may cause refrigerant gas leakage.

Pipe size Pipe insulation

O.D.: 6.4mm / Thickness: 0.8mm

O.D.: 9.5mm, 12.7mm / Thickness: 0.8mm

O.D.: 15.9mm / Thickness: 1.0mm

I.D.: 8–10mm / Thickness: 10mm min.

I.D.: 12–15mm / Thickness: 13mm min.

I.D.: 16–20mm / Thickness: 13mm min.

Wall

If no flare cap is

available, cover

the flare mouth

with tape to keep

dirt or water out.

Be sure to

place a cap.

Rain

Gas pipe

Liquid pipe

Gas pipe

insulation

Liquid pipe

insulation

Finishing tape

Drain hose

Inter-unit wiring

(Cut exactly at

right angles.) Remove burrs

Set exactly at the position shown below.

Flaring

Die

Check

Flare’s inner

surface must

be flaw-free.

The pipe end must

be evenly flared in

a perfect circle.

Make sure that the

flare nut is fitted.

A 0-0.5mm

Clutch-type

Flare tool for R410A

1.0-1.5mm

Clutch-type (Rigid-type)

1.5-2.0mm

Wing-nut type (Imperial-type)

Conventional flare tool

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Daikin R410A Split Series Installation Manual Page 11

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