Outdoor Units - Panasonic U-72MF2U9 Installation Instructions Manual

5-3. Insulating the Refrigerant Tubing
Tubing Insulation
● Thermal insulation must be applied to all unit tubing, including
the distribution joint (purchased separately).
How to arrange 2 tubes (between solenoid valve kit and
indoor unit)
Liquid tubing
Insulation
How to arrange 3 tubes (between outdoor unit and
solenoid valve kit)
Cosmetic (finishing) tape
Discharge tubing
Insulation
How to arrange 4 tubes (between outdoor units)
Cosmetic (finishing) tape
Discharge tubing
Balance tubing
Insulation
* For gas tubing and discharge 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 25/64" (10mm) or greater.
If the conditions inside the ceiling exceed DB 86°F (30°C) and
RH 70%, increase the thickness of the gas tubing and suction
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 supplied black insulation tape.
Finally, fasten the insulator at both ends with the supplied vinyl
clamps.
Sealer (supplied) Insulation tape (white)
(supplied)
Unit side
insulator
Flare nut
Vinyl clamps (supplied)
Gas tubing
Suction tubing
Liquid tubing
Suction tubing
Liquid tubing
Flare insulator (supplied)
Tube insulator
(not supplied)
Heat resistant
248°F (120°C)
or above
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 the 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 ft. (m).
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.
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.
Apply putty here
36
Clamp
Insulated tubes Drain hose
Tubing