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5-3. Insulating the Refrigerant Tubing
Tubing Insulation
● Thermal insulation must be applied to all unit tubing,
including the distribution joint (purchased separately).
(Fig. 5-7)
* For gas tubing, the insulation material must be heat
resistant to 248°F or above. For other tubing, it must be
heat resistant to 176°F or above.
Insulation material thickness must be 25/64" or greater.
If the conditions inside the ceiling exceed DB 86°F 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
CAUTION
square duct covering, make sure
you allow sufficient space to use
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 the sup-
plied black insulation tape. Finally, fasten the insulator at both
ends with the supplied vinyl clamps. (Fig. 5-8)
Two tubes arranged together
Liquid tubing
Insulation
Three tubes arranged together
Cosmetic
(finishing) tape
Liquid tubing
Insulation
Sealer (supplied)
Insulation tape (white)
Unit side
insulator
Flare nut
Vinyl clamps (supplied)
30
Gas tubing
Gas tubing
Balance tubing
Fig. 5-7
(supplied)
Flare insulator (supplied)
Tube insulator
(not supplied)
Heat resistant
248°F or above
Fig. 5-8
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