5-4. Connecting Tubing between Indoor and Outdoor Units

a)Tightly connect the indoor side refrigerant tubing exten- ded from the wall with the outdoor side tubing. (Fig. 21)

b)To fasten the flare nuts, apply specified torque as:

Table 5

Tube Dia.

Nut

Tightening Torque

 

 

 

1/4" (6.35 mm)

21/32" (17 mm)

Approx. 120 – 160 lbs·in (140 – 180 kgf·cm)

 

 

 

3/8" (9.52 mm)

7/8" (22 mm)

Approx. 300 – 360 lbs·in (340 – 420 kgf·cm)

 

 

 

1/2" (12.70 mm)

1-1/32" (26 mm)

Approx. 430 – 480 lbs·in (490 – 550 kgf·cm)

 

 

 

5/8" (15.88 mm)

1-5/32" (29 mm)

Approx. 590 – 710 lbs·in (680 – 820 kgf·cm)

 

 

 

5-5. Insulation of Refrigerant Tubing

Torque wrench

Indoor unit

Spanner

 

 

Outdoor unit

 

Fig. 21

 

Insulation

 

Thickness:

Min.

min. 5/16"

5/16"

(8 mm)

(8 mm)

 

IMPORTANT

To prevent heat loss and wet floors due to dripping of con-

densation, both tubes must be well insulated with a proper insulation material.

The thickness of the insulation should be a minimum 5/16" (8 mm). (Fig. 22)

Taping the flare nuts

Wind the insulation tape around the flare nuts at the tube connections. Secondly cover up the tubing connec- tions with the flare insulation (1/8" (T3, supplied)). Then

Fig. 22

Insulation tape (supplied)

Flare insulation (3/16"(T5, supplied) )

 

Flare insulation (1/8"(T3, supplied) )

 

Tube insulation

 

(not supplied)

Flare nut

 

Vinyl tie (supplied)

 

Fig. 23

wind the other flare insulation (3/16" (T5, supplied)). Finally, fasten the insulation at both ends with the sup- plied vinyl ties. (Fig. 23)

Insulation material

The material used for insulation must have good insula- tion characteristics, be easy to use, be age resistant, and must not easily absorb moisture.

Drain hose insulation and vinyl tie (supplied)

Drain hose and hose band (supplied)

Drain pipe and insulation

Refrigerant tubing

(not supplied)

and insulation

 

(not supplied)

Insulation tape (supplied)

Vinyl tie (supplied)

Flare

insulation (supplied)

CAUTION

After a tube has been insulat-

ed, never try to bend it into a

 

 

 

narrow curve because it can

 

cause the tube to break or

 

crack.

The procedure used for installing the insulation for both wide and narrow tubes are the same.

Fig. 24

Never grasp the drain or refrigerant connecting out- lets when moving the unit.

17

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Image 107
Panasonic CS-KE18NB4UW Connecting Tubing between Indoor and Outdoor Units, Insulation of Refrigerant Tubing, Crack
Page 106 Page 108

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