Sanyo SPW-XR254EH56 User Manual download pdf (Page 18)

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 match-

ing surfaces of the flare and union before connect-

ing them together. This is effective for reducing

gas leaks. (Fig. 4-4)

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

flare tube straight with each other, then screw in

the flare nut lightly at first to obtain a smooth

match. (Fig. 4-5)

● Adjust the shape of the narrow tube (liquid tube)

using a tube bender at the installation site and

connect it to the narrow tubing side (liquid tubing

side) valve using a flare.

Cautions During Brazing

● Replace air inside the tube with nitrogen gas to

prevent copper oxide film 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 for-

mation of oxide film. These agents adversely

affect the refrigerant and refrigerant oil, and

may cause damage or malfunctions.

4-2. Connecting Tubing Between Indoor and Out-

door Units

(1) Tightly connect the indoor-side refrigerant tubing

extended from the wall with the outdoor-side tub-

ing.

(2) To fasten the flare nuts, apply specified torque as

at right:

● When removing the flare nuts from the tubing con-

nections, or when tightening them after connecting

the tubing, be sure to use 2 monkey wrenches or

spanners as shown. (Fig. 4-6)

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

damaged, which could result refrigerant leakage

and cause in injury or asphyxiation to room occu-

pants.

● When removing or tightening the wide tube flare

nut, use 2 monkey wrenches together: one at the

wide tube flare nut and one at part A.(Fig. 4-7)

● For the flare nuts at tubing connections, be sure to

use the flare nuts that were supplied with the unit,

or else flare nuts for R410A (type 2). The refriger-

ant tubing that is used must be of the correct wall

thickness as shown in the table at right.

Apply refrigerant

lubricant here and here

Fig. 4-4

Flare nut

Union

Fig. 4-5

Fig. 4-6

Indoor unit

Outdoor unit

Spanner

Torque wrench

Tube diameter

6.35 (1/4")

9.52 (3/8")

12.7 (1/2")

15.88 (5/8")

Tightening torque,

approximate

14 – 18 N

(140 – 180 kgf

cm)

34 – 42 N

(340 – 420 kgf

cm)

49 – 61 N

(490 – 610 kgf

cm)

68 – 82 N

(680 – 820 kgf

cm)

0.8 mm

1.0 mm

Tube thickness

Because the pressure is approximately 1.6 times

higher than conventional refrigerant pressure, the

use of ordinary flare nuts (type 1) or thin-walled

tubes may result in tube rupture, injury, or asphyxi-

ation caused by refrigerant leakage.

● In order to prevent damage to the flare caused by

over-tightening of the flare nuts, use the table

above as a guide when tightening.

● When tightening the flare nut on the narrow tube,

use a monkey wrench with a nominal handle length

of 200 mm.

Fig. 4-7

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 39 40

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Sanyo SPW-XR254EH56 User Manual Page 18

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