Connecting Tubing Between Indoor And; Outdoor Units - Panasonic CS-KE12NB41 Technical & Service Manual

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
1/4" (6.35 mm) 21/32" (17 mm)
3/8" (9.52 mm) 7/8" (22 mm)
1/2" (12.70 mm) 1-1/32" (26 mm)
5/8" (15.88 mm) 1-5/32" (29 mm)
5-5. Insulation of Refrigerant Tubing
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
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.
After a tube has been insulat-
CAUTION
ed, never try to bend it into a
narrow curve because it can
cause the tube to break or
crack.
Tightening Torque
Approx. 120 – 160 lbs·in (140 – 180 kgf·cm)
Approx. 300 – 360 lbs·in (340 – 420 kgf·cm)
Approx. 430 – 480 lbs·in (490 – 550 kgf·cm)
Approx. 590 – 710 lbs·in (680 – 820 kgf·cm)
17
Torque wrench
Indoor unit
Min.
5/16"
(8 mm)
Insulation tape (supplied)
Flare nut
Vinyl tie (supplied)
Drain hose insulation Drain pipe and insulation
and vinyl tie (not supplied)
(supplied)
Drain hose
and hose band
(supplied)
Never grasp the drain or refrigerant connecting out-
lets when moving the unit.
Spanner
Outdoor unit
Fig. 21
Insulation
Thickness:
min. 5/16"
(8 mm)
Fig. 22
Flare insulation (3/16"(T5, supplied) )
Flare insulation (1/8"(T3, supplied) )
Tube insulation
(not supplied)
Fig. 23
Refrigerant tubing
and insulation
(not supplied)
Insulation tape (supplied)
Vinyl tie (supplied)
Flare
insulation (supplied)
The procedure used for installing
the insulation for both wide and
narrow tubes are the same.
Fig. 24