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5-3. Insulating the Refrigerant Tubing
Tubing Insulation
•
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.
If the exterior of the outdoor unit valves has been finished with a square
CAUTION
duct covering, make sure you allow sufficient space to access the valves
and to allow the panels to be attached and removed.
Taping the flare nuts
Wind the white insulation 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 an insulation tape.
Finally, fasten the insulator at both ends with the supplied vinyl clamps.
(Fig. 5-8)
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.
After a tube has been insulated, never try to bend it into a narrow curve
CAUTION
because it can cause the tube to break or crack.
Never grasp the drain or refrigerant connecting outlets when moving the unit.
5-4. Taping the Tubes
(1) At this time, the refrigerant tubes (and electrical wiring if local codes permit) should be
taped together with armoring tape in 1 bundle. To prevent condensation from overflowing
the drain pan, keep the drain hose separate from the refrigerant 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.
(3) Clamp the tubing bundle to the wall, using 1 clamp approx. each meter. (Fig. 5-9)
N OT E
Do not wind the armoring tape too tightly since this will decrease the heat insulation effect.
Also ensure that the condensation drain hose splits away from the bundle and drips clear of
the unit and the tubing.
5-5. 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. 5-10)
Unit side
22
Two tubes arranged together
Liquid tubing
Insulation
Flare insulator (supplied)
Insulation tape
Flare union
(not supplied)
Tube insulator (not
Flare nut
supplied)
Heat resistant
120°C or above
Insulated tubes
Apply putty here
Tubing
Gas tubing
Fig. 5-7
Fig. 5-8
Clamp
Drain hose
Fig. 5-9
Fig. 5-10
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