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Fig. 5-10
Fig. 5-11
5-3. Insulating the Refrigerant Tubing
Tubing Insulation
● 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.
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. 5-10)
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.
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.
CAUTION
CAUTION
Never grasp the drain or refrigerant connecting
outlets when moving the unit.
Unit side
insulator
Insulation tape (white)
(supplied)
Sealer (supplied)
Flare insulator (supplied)
Tube insulator
(not supplied)
Heat resistant
120°C or above
Vin
y
l clamps (supplied)
Flare nut
The procedure used for
installing the insulator for
both wide and narrow
tubes is the same.
Seal
Flare
insulator
Vinyl
clamp
Insulation
tape
Refrigerant tubing and insulator
(not supplied)
Drain pipe and insulator
(not supplied)
Drain insulator
and clamp.
Large
(supplied)
Packing
clamp.
Small
hose band
(supplied)
Fig. 5-9
Two tubes arranged together
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.
● Do not use a spanner to tighten the valve stem
caps. Doing so may damage the valves.
● Depending on the installation conditions, applying
excessive torque may cause the nuts to crack.
Precautions for Packed Valve Operation
● If the packed valve is left for a long time with the
valve stem cap removed, refrigerant will leak from
the valve. Therefore, do not leave the valve stem
cap removed.
● Use a torque wrench to securely tighten the valve
stem cap.
● Valve stem cap tightening torque:.
Charging port
8 – 10 Nm (80 - 100 kgfcm)
9,52 mm (Narrow side) 19 – 21 N m (190 - 210 kgf cm)
15,88 mm (Wide side)) 28 – 32 N m (280 - 320 kgf cm)
Charging port
Valve stem cap
Valve stem
Main valve
Packed val ve
Inter-unit
control wiring
Wide tube
Narrow tube
Armoring tape
Insulation
Fig. 5-8