Panasonic U-26PE1U6 Technical Data & Service Manual page 122

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
"
ø3/8 (Liquid side)
"
ø5/8 (Gas side)
3. Insulating the Refrigerant Tubing
Tubing Insulation
1
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.
CAUTION
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. 1-23)
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.
CAUTION
·
in. {80 – 100 kgf
70 – 85 lbf
·
in. {190 – 210 kgf
160 – 180 lbf
·
in. {280 – 320 kgf
240 – 270 lbf
If the exterior of the outdoor unit
valves has been fi nished with a
square duct covering, make sure
you allow suffi cient space to
access the valves and to allow
the panels to be attached and
removed.
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.
Valve stem cap
·
cm}
·
cm}
·
cm}
Inter-unit
control wiring
Unit side
insulator
Flare nut
Never grasp the drain or refrigerant connecting
outlets when moving the unit.
1-114
1. Specifications
Packed valve
Charging port
Valve stem
Main valve
Fig. 1-21
2 tubes arranged together
Gas tube
Armoring tape
Insulation
Fig. 1-22
Insulation tape (white)
(supplied)
Flare insulator (supplied)
Tube insulator
(not supplied)
Heat resistant
248°F or above
Fig. 1-23
Liquid tube