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5-3. Insulating the Refrigerant Tubing
Tubing Insulation
Must ensure that pipe-work shall be protected from physical damage.
● Thermal insulation must be applied to all units tubing,
including distribution joint (field supply).
* 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
If the exterior of the outdoor unit valves has been finished with a square duct covering,
make sure you allow sufficient space to access the valves and to allow the panels to be
attached and removed.
Additional Precautions For R32 Models
Ensure to do the re-flaring of pipes before connecting to units to avoid leaking.
To prevent the ingress of moisture into the joint which could have the potential to freeze and
then cause leakage, the joint must be sealed with suitable silicone and insulation material.
The joint should be sealed on both liquid and gas side.
Insulation material and silicone sealant.
Please ensure there are no gaps where moisture can enter the joint.
Silicone Sealant must be neutral cure and ammonia free. Use of silicone containing
ammonia can lead to stress corrosion on the joint and cause leakage.
Taping the flare nuts
Wind the insulating tape around the flare
nuts at the gas / liquid tube connections.
Then cover up the tubing connections with
the flare insulator.
Insulation material
The material used for insulation must have
good insulation characteristics, be easy to
use, be age resistant, and must not easily
absorb moisture.
NOTE
If noise bothers you from the area between indoor and outdoor units’ connection pipes, it is
effective to wind the soundproofing materials (field supply) to reduce noise.
CAUTION
After a tube has been insulated, never try to bend it into a narrow curve because it can
cause the tube to break or crack.
Never grasp the drain or refrigerant connecting outlets when moving the unit.
Two tubes arranged together
Liquid tube
Insulation
Gas tube
Insulating tape
(supplied)
Different-diameter-tube joint
Insulating tape
(supplied)
Tube insulator
(not supplied)
Heat resistant
120°C or above
Flare union
Flare nut
Unit side
* Illustration shows when using by
S-60PY3E. (Only PZ3 series)
01_330918_EU_Eng.indb 37 2021/9/9 11:26:49
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