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FVXS50FV1B
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Daikin FVXS50FV1B [10/18] 2 selection of copper and heat insulation materials

■English 8

Connecting the refrigerant pipe

CAUTION

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

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

3) 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.

6-1. 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.

6-2. 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.

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

Flare nut tightening torque

Gas side Liquid side

25/35 class 50 class 25/35/50 class

3/8 inch 1/2 inch 1/4 inch

32.7-39.9N·m

(333-407kgf·cm)

49.5-60.3N·m

(505-615kgf·cm)

14.2-17.2N·m

(144-175kgf·cm)

Gas side

Liquid side

Gas pipe thermal insulation Liquid pipe

thermal

insulation

25/35 class 50 class 25/35 class 50 class

O.D. 9.5mm O.D. 12.7mm O.D. 6.4mm I.D. 12-15mm I.D. 14-16mm I.D. 8-10mm

Minimum bend radius Thickness 10mm Min.

30mm or more 40mm or more 30mm or more

Thickness 0.8mm (C1220T-O)

Torque wrench

Piping union

Flare nut

Do not apply refrigeration

oil to the outer surface.

Flare nut

Apply refrigeration oil to

the inner surface of the

flare.

Do not apply refrigeration

oil to the flare nut avoid

tightening with over torque.

Spanner

[Apply oil] [Tighten]

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

Liquid pipe

Gas pipe

insulation

Liquid pipe

insulation

Finising tape

Inter-unit

wiring

01_EN_3P191292-1E.fm Page 8 Monday, November 10, 2008 6:44 PM

Daikin FVXS50FV1B [10/18] 2 selection of copper and heat insulation materials

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