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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 in. 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 pan-
els 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)
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. (Fig. 5-9)
After a tube has been insulated,
never try to bend it into a narrow
CAUTION
curve because it can cause the
tube to break or crack.
Two tubes arranged together
Liquid tubing
Insulation
Three tubes arranged together
Cosmetic
(finishing) tape
Liquid tubing
Insulation
Sealer (supplied)
Unit side
insulator
Flare nut
Drain insulator
and clamp.
Large
(supplied)
Packing
clamp.
Small
hose band
(supplied)
Never grasp the drain or refrigerant connecting outlets
when moving the unit.
30
Gas tubing
Gas tubing
Balance tubing
Fig. 5-7
Insulation tape (white)
(supplied)
Flare insulator (supplied)
Tube insulator
(not supplied)
Heat resistant
248°F or above
Vinyl clamps (supplied)
Fig. 5-8
Refrigerant tubing and insulator
(not supplied)
Drain pipe and insulator
(not supplied)
Insulation
tape
Vinyl
Flare
clamp
insulator
Seal
The procedure used for
installing the insulator for
both gas and liquid
tubes is the same.
Fig. 5-9
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