Insulating The Refrigerant Tubing; Taping The Tubes - Panasonic S-12MT2U6 Installation Instructions Manual

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 248°F (120°C) or above. For other tubing, it
must be heat resistant to 176°F (80°C) or above.
Insulation material thickness must be 13/32" (10 mm) or
greater.
If the conditions inside the ceiling exceed DB 86°F (30°C)
and RH 70%, increase the thickness of the gas tubing
insulation material with one grade higher.
Insulation of the flare nuts
Attach the flare insulator (supplied) just like wrapping around
the flare nut (supplied). Match the both slits of flare insulators
for gas and liquid tubes facing upward. Tightly attach the end of
the flare insulators to the tube cradle without any space. Then
clamp the flare insulator with the clampers about 25/32" (20 mm)
away from both ends.
If the exterior of the outdoor unit
valves has been finished with a
square duct covering, make sure you
WARNING
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 the supplied
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.
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.
WARNING
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)
Facing upward
Liquid tubing
Gas tubing
Insulator (not supplied)
Clamper
Outdoor unit
side
About
25/32" (20 mm)
NOTE
Tighten the clampers to prevent any condensation that may
occur as the copper tubing is exposed.
Flare insulator (supplied)
Flare union
Unit side
NOTE
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.
18
Flare insulator (for gas tube)
Flare insulator
(for liquid tube)
Tube cradle
Without any space
Flare nut
Clamper
Tube cradle
(supplied)
Indoor unit
side
About
25/32" (20 mm)
Insulation tape (white)
(supplied)
Tube insulator (not supplied)
Flare nut
Heat resistant 248°F (120°C) or
above
Clamp
Drain hose
Insulated tubes
Fig. 5-7
Fig. 5-8
Fig. 5-9