23
ENGLISH
E PORTUGUÊS
O For the fl are nuts at tubing connections, be sure to use the
fl are nuts that were supplied with the unit, or else fl are nuts for
R410A (type 2). The refrigerant tubing that is used must be of
the correct wall thickness as shown in the table below.
Unit side
Flare insulator (supplied)
Flare union
Insulation tape (white)
(supplied)
Flare nut
Tube insulator
(not supplied)
Heat resistant
120°C or above
Tube diameter
Tightening torque
(approximate)
Tube thickness
ø6.35 (1/4")
14 – 18 N · m
(140 – 180 kgf · cm)
0.8 mm
ø9.52 (3/8")
34 – 42 N · m
(340 – 420 kgf · cm)
0.8 mm
ø12.7 (1/2")
49 – 61 N · m
(490 – 610 kgf · cm)
0.8 mm
ø15.88 (5/8")
68 – 82 N · m
(680 – 820 kgf · cm)
1.0 mm
Fig.5-8
Because the pressure is approximately 1.6 times higher than
conventional refrigerant pressure, the use of ordinary fl are nuts
(type 1) or thin-walled tubes may result in tube rupture, injury,
or asphyxiation caused by refrigerant leakage.
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.
O In order to prevent damage to the fl are caused by over-
tightening of the fl are nuts, use the table above as a guide
when tightening.
CAUTION
O When tightening the fl are nut on the liquid tube, use an
adjustable wrench with a nominal handle length of 200 mm.
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.
Never grasp the drain or refrigerant connecting outlets when
moving the unit.
5-3. Insulating the Refrigerant Tubing
Tubing Insulation 5-4. Taping the Tubes
O Thermal insulation must be applied to all units tubing, including
distribution joint (fi eld supply).
(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 condensation from overfl owing the drain
pan, keep the drain hose separate from the refrigerant tubing.
* 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.
(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.
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 mate-
rial by 1 step.
(3) Clamp the tubing bundle to the wall, using 1 clamp approx.
each meter. (Fig. 5-9)
Insulated tubes
Clamp
Drain hose
Two tubes arranged together
Liquid tubing
Gas tubing
Insulation
Fig.5-7
CAUTION
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.
Taping the are nuts
Fig.5-9
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. 5-8)
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.
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