99
Fig. 9-10
Fig. 9-9
Fig. 9-8
Fig. 9-11
● 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:
9-3. 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 conditions inside the ceiling exceed DB 86°F and
RH 70%, increase the thickness of the gas tubing
insulation material by 1 step.
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. 9-10)
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.
tubes is the same.
and clamp.
clamp.
2 tubes arranged together
If the exterior of the outdoor unit
valves has been finished with a
square duct covering, make sure
you allow sufficient space to
access the valves and to allow
the panels to be attached and
removed.
Charging port 8 – 10 N • m (80 – 100 kgf • cm)
ø3/8" (Liquid side) 19 – 21 N • m (190 – 210 kgf • cm)
ø5/8
" (Gas side) 28 – 32 N • m (280 – 320 kgf • cm)
