Panasonic WH-ADF0309J3E5CM Service Manual page 117

12.1.5.3 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 120ºC or above. For other
tubing, it must be heat resistant to 80ºC or above.
Insulation material thickness must be 10 mm or greater.
If the conditions inside the ceiling exceed DB 30ºC 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.
Taping the flare nuts
Wind the white insulating tape around the flare nuts at
the gas tube connections.
Then cover up the tubing connections with the flare
insulator, and fill the gap at the union with the supplied
black insulating tape.
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.
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
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 silicon containing ammonia can lead to
stress corrosion on the joint and cause leakage.
Insulating tape
(supplied)
Unit side
Flare union
117
Gas tube
Flare nut
Tube insulator
(not supplied)
Heat resistant
120ºC or above