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4-3. Insulating the Refrigerant Tubing
Tubing Insulation
G
Thermal insulation must be applied to all unit tub-
ing, including distribution joint (purchased sepa-
rately).
* For gas tubing, the insulation material must be
heat resistant to 120°C or above. For other tubing,
it must be heat resistant to 80°C or above.
Insulation material thickness must be 10 mm or
greater.
If the conditions inside the ceiling exceed DB 30°C
and RH 70%, increase the thickness of the gas
tubing insulation material by 1 step.
CAUTION
Taping the flare nuts
Wind the white insulation tape around the flare nuts at
the wide tube connections. Then cover up the tubing
connections with the flare insulator, and fill the gap at
the union with the supplied black insulation tape.
Finally, fasten the insulator at both ends with the sup-
plied vinyl clamps. (Fig. 4-8)
Insulation material
The material used for insulation must have good insu-
lation characteristics, be easy to use, be age resis-
tant, and must not easily absorb moisture.
CAUTION
If the exterior of the outdoor
unit valves has been finished
with a square duct covering,
make sure you allow suffi-
cient space to use the valves
and to allow the panels to be
attached and removed.
After a tube has been insu-
lated, never try to bend it
into a narrow curve
because it can cause the
tube to break or crack.
Two tubes arranged together
Narrow tubing
Insulation
Three tubes arranged together
Narrow tubing
Insulation
Sealer (supplied)
Unit side
insulator
Flare nut
Drain insulator
and clamp.
Large
(supplied)
Packing
clamp.
Small
hose band
(supplied)
Never grasp the drain or refrigerant connecting
outlets when moving the unit.
19
Wide tubing
Cosmetic
(finishing) tape
Wide tubing
Balance tubing
Fig. 4-7
Insulation tape (white)
(supplied)
Flare insulator (supplied)
Tube insulator
(not supplied)
Heat resistant
120°C or above
Vinyl clamps (supplied)
Fig. 4-8
Refrigerant tubing and insulator
(not supplied)
Drain pipe and insulator
(not supplied)
Insulation
tape
Vinyl
Flare
clamp
insulator
Seal
The procedure used for
installing the insulator for
both wide and narrow
tubes is the same.
Fig. 4-9
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