Daikin R32 Split Series Посібник з монтажу - Сторінка 14

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Daikin R32 Split Series Посібник з монтажу

Refrigerant Piping Work

Refrigerant piping

CAUTION

• Use the flare nut fixed to the main unit. (To prevent cracking of the flare nut by aged deterioration.)

• To prevent gas leakage, apply refrigeration oil only to the inner surface of the flare. (Use refrigeration oil for R32 or R410A.)

• Use torque wrenches when tightening the flare nuts to prevent damage to the flare nuts and gas leakage.

Align the centres of both flares and tighten the flare nuts 3 or 4 turns by hand. Then tighten them fully with the torque wrenches.

Do not apply refrigeration oil to

the flare nut to avoid tightening

with excessive torque.

2-1. Caution on piping 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.

2-2. 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

dimensions as below.

Gas side

O.D. 9.5mm

Thickness 0.8mm (C1220T-O)

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

[Apply oil]

Do not apply refrigeration

oil to the outer surface.

Flare nut

Gas side

3/8 inch

32.7-39.9N • m

(330-407kgf • cm)

Liquid side

O.D. 6.4mm

Minimum bend radius

30mm or more

Apply refrigeration oil to

the inner surface of the

ﬂare.

Flare nut tightening torque

Liquid side

1/4 inch

14.2-17.2N • m

(144-175kgf • cm)

Gas pipe thermal

insulation

I.D. 12-15mm

Thickness 10mm Min.

[Tighten]

Torque wrench

Spanner

Piping union

Flare nut

Be sure to

place a cap.

Rain

If no flare cap is

available, cover the

flare mouth with

tape to keep dirt

or water out.

Gas pipe

insulation

Finishing tape

Liquid pipe thermal

insulation

I.D. 8-10mm

Wall

Inter-unit wire

Liquid pipe

insulation

Drain hose

English