Insulating The Refrigerant Tubing - Panasonic R410A Installation Instructions Manual

Do not use a spanner to tighten the valve stem caps.
Doing so may damage the valves.
Depending on the installation conditions, applying
excessive torque may cause the nuts to crack.
Precautions for Packed Valve Operation
If the packed valve is left for a long time with the valve
stem cap removed, refrigerant will leak from the valve.
Therefore, do not leave the valve stem cap removed.
Use a torque wrench to securely tighten the valve stem
cap.
Valve stem cap tightening torque:
Charging port 70 – 85 in.lbs (80 – 100 kgf • cm)
"
ø3/8 (Liquid side) 160 – 180 in.lbs (190 – 210 kgf • cm)
"
ø5/8 (Gas side) 240 – 270 in.lbs (280 – 320 kgf • cm)

6-3. Insulating the Refrigerant Tubing

Tubing Insulation
Thermal insulation must be applied to all unit tubing,
including the distribution joint (purchased separately).
* 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 13/32 in. or greater.
If the exterior of the outdoor unit
valves has been fi nished with a
CAUTION
square duct covering, make sure
you allow suffi cient space to
access the valves and to allow
the panels to be attached and
removed.
Taping the fl are nuts
Wind the white insulation tape around the fl are nuts at the
gas tube connections. Then cover up the tubing
connections with the fl are insulator, and fi ll the gap at the
union with the supplied black insulation tape. Finally, fasten
the insulator at both ends with the supplied vinyl clamps.
(Fig. 6-10)
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
CAUTION
curve because it can cause
the tube to break or crack.
Packed valve
Valve stem
Valve stem cap
Fig. 6-8
2 tubes arranged together
Inter-unit
control wiring
Insulation
Fig. 6-9
Sealer (supplied)
Insulation tape (white)
(supplied)
Unit side
insulator
Flare nut
Vinyl clamps (supplied)
Fig. 6-10
Never grasp the drain or refrigerant connecting
outlets when moving the unit.
26
Charging port
Main valve
Gas tube
Liquid tube
Armoring tape
Flare insulator (supplied)
Tube insulator
(not supplied)
Heat resistant
248°F or above