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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. 52)
b) To fasten the flare nuts, apply specified torque as:
Table 6
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. (Fig. 53)
The thickness of the insulation should be a minimum 5/16"
(8 mm). (Fig. 54)
5-6. Taping the Tubes
After a tube has been insulat-
CAUTION
ed, never try to bend it into a
narrow curve, as this may
cause the tube to break or
crack.
(1) At this time, the 2 refrigerant tubes (and electrical wire
if local codes permit) should be taped together with
armoring tape. The drain hose may also be included
and taped together as 1 bundle with the tubing.
(2) Wrap the armoring tape from the bottom of the outdoor
unit to the top of the tubing where it enters the wall. As
you wrap the tubing, overlap half of each previous tape
turn. (Fig. 55)
(3) Clamp the tubing bundle to wall, using 1 clamp approx.
every 47" (120 cm).
NOTE
Do not wind the armoring tape too tightly, since this will
decrease the heat insulation effect. Also, be sure the con-
densation drain hose splits away from the bundle and drips
clear of the unit and the tubing.
5-7. Finishing the Installation
After finishing insulating and taping over the tubing, use
sealing putty to seal off the hole in the wall to prevent rain
and draft from entering. (Fig. 56)
Tightening Torque
Approx. 120 – 160 lbs·in (140 – 180 kgf·cm)
Approx. 300 – 360 lbs·in (340 – 420 kgf·cm)
Approx. 430 – 540 lbs·in (490 – 610 kgf·cm)
Approx. 590 – 710 lbs·in (680 – 820 kgf·cm)
24
Torque wrench
Indoor unit
Fig. 52
Fig. 53
Insulation
Min.
5/16"
(8 mm)
Fig. 54
Fig. 55
Apply putty here
Tubing
Fig. 56
Spanner
Outdoor unit
Flare
insulation
Thickness:
min. 5/16"
(8 mm)
Clamp
Insulated tubes
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