Panasonic CZ-ESWC2 Instrukcja Instalacji Pobierz pdf (Strona 72)

Caution Before Connecting Tubes Tightly

(1) Apply a sealing cap or water-proof tape to prevent

dust or water from entering the tubes before they are

used.

(2) Be sure to apply refrigerant lubricant to the matching

surfaces of the ﬂ are and union before connecting them

together. This is effective for reducing gas leaks.

(Fig. 5-4)

(3) For proper connection, align the union tube and ﬂ are

tube straight with each other, then screw in the ﬂ are

nut lightly at ﬁ rst to obtain a smooth match. (Fig. 5-5)

Adjust the shape of the liquid tube using a tube bender

●

at the installation site and connect it to the liquid tubing

side valve using a ﬂ are.

Cautions During Brazing

Replace air inside the tube with nitrogen gas to

●

prevent copper oxide ﬁ lm from forming during the

brazing process. (Oxygen, carbon dioxide and

Freon are not acceptable.)

Do not allow the tubing to get too hot during

●

brazing. The nitrogen gas inside the tubing may

overheat, causing refrigerant system valves to

become damaged. Therefore allow the tubing to

cool when brazing.

Use a reducing valve for the nitrogen cylinder.

●

Do not use agents intended to prevent the

●

formation of oxide ﬁ lm. These agents adversely

affect the refrigerant and refrigerant oil, and may

cause damage or malfunctions.

5-2. Connecting Tubing Between Indoor and Outdoor

Units

(1) Tightly connect the indoor-side refrigerant tubing

extended from the wall with the outdoor-side tubing.

(2) To fasten the ﬂ are nuts, apply speciﬁ ed torque as at

right:

When removing the ﬂ are nuts from the tubing

●

connections, or when tightening them after connecting

the tubing, be sure to use 2 adjustable wrenches or

spanners as shown. (Fig. 5-6)

If the ﬂ are nuts are over-tightened, the ﬂ are may be

damaged, which could result refrigerant leakage and

cause in injury or asphyxiation to room occupants.

For the ﬂ are nuts at tubing connections, be sure to use

●

the ﬂ are nuts that were supplied with the unit, or else

ﬂ are nuts for R410A (type 2). The refrigerant tubing

that is used must be of the correct wall thickness as

shown in the table at right.

Because the pressure is approximately 1.6 times

higher than conventional refrigerant pressure, the use

of ordinary ﬂ are nuts (type 1) or thin-walled tubes may

result in tube rupture, injury, or asphyxiation caused by

refrigerant leakage.

In order to prevent damage to the ﬂ are caused by

●

over-tightening of the ﬂ are nuts, use the table above

as a guide when tightening.

When tightening the ﬂ are nut on the liquid tube, use

●

an adjustable wrench with a nominal handle length of

7-7/8 in.

Apply refrigerant

lubricant

Fig. 5-4

Flare nut

Union

Fig. 5-5

Torque wrench

Indoor unit

Outdoor unit

Spanner

Fig. 5-6

Tube diameter

Tightening torque,

approximate

Tube thickness

ø1/4" (ø6.35 mm)

120 – 160 lbs·inch

(140 – 180 kgf·cm)

1/32"

(0.8 mm)

ø3/8" (ø9.52 mm)

300 – 360 lbs·inch

(340 – 420 kgf·cm)

1/32"

(0.8 mm)

ø1/2"(ø12.7 mm)

430 – 480 lbs·inch

(490 – 550 kgf·cm)

1/32"

(0.8 mm)

ø5/8" (ø15.88 mm)

590 – 710 lbs·inch

(680 – 820 kgf·cm)

5/128"

(1.0 mm)

ø3/4" (ø19.05 mm)

870 – 1040 lbs·inch

(1000 – 1200 kgf·cm)

over 5/128"

(1.0 mm)

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