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●
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
ø9.52 (Liquid side)
ø15.88 (Gas side)
7-3. Insulating the Refrigerant Tubing
Tubing Insulation
●
Thermal insulation must be applied to all units tub-
ing, including distribution joint (purchased sepa-
rately).
* For gas tubing, the insulation material must be
heat resistant to 120°C or above. For other tubing,
it must be heat resistant to 80°C or above.
Insulation material thickness must be 10 mm or
greater.
If the conditions inside the ceiling exceed DB 30°
C and RH 70%, increase the thickness of the gas
tubing insulation material by 1 step.
CAUTION
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 sup-
plied vinyl clamps. (Fig. 7-10)
Insulation material
The material used for insulation must have good insu-
lation characteristics, be easy to use, be age resis-
tant, and must not easily absorb moisture.
CAUTION
DC̲Inverter̲Eng.indd 57
DC̲Inverter̲Eng.indd 57
8 – 10 N • m (80 – 100 kgf • cm)
19 – 21 N • m (190 – 210 kgf • cm)
28 – 32 N • m (280 – 320 kgf • cm)
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.
After a tube has been insu-
lated, never try to bend
it into a narrow curve
because it can cause the
tube to break or crack.
Packed valve
Valve stem
Valve stem cap
Fig. 7-8
Two tubes arranged together
Inter-unit
control wiring
Insulation
Fig. 7-9
Sealer (supplied)
Insulation tape (white)
(supplied)
Unit side
insulator
Flare nut
Vinyl clamps (supplied)
Fig. 7-10
Drain insulator
Drain pipe and insulator
and clamp.
(not supplied)
Large
(supplied)
Packing
clamp.
Small
hose band
(supplied)
Seal
Fig. 7-11
Never grasp the drain or refrigerant connecting
outlets when moving the unit.
57
Charging port
Main valve
Gas tube
Liquid tube
Armoring tape
Flare insulator (supplied)
Tube insulator
(not supplied)
Heat resistant
120°C or above
Refrigerant tubing and insulator
(not supplied)
Insulation
tape
Vinyl
Flare
clamp
insulator
The procedure used for
installing the insulator for
both gas and liquid
tubes is the same.
2007/07/25 13:21:46
2007/07/25 13:21:46
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