19
NO
TE
A good flare should have the following characteristics:
●
inside surface is glossy and smooth
●
edge is smooth
●
tapered sides are of uniform length
Flare size: A (mm)
A
Copper tubing
(Outer dia.)
A
0
–
0.4
ø6.35
9.1
ø9.52
13.2
ø12.7
16.6
ø15.88
19.7
Caution Bef
ore Connecting
T
ubes
Tightl
y
(1)
Apply a sealing cap or water-proof tape to prevent dust or
water from entering the tubes before they are used.
"ESURETOAPPLYREFRIGERANTLUBRICANTTOTHEMATCHING
surfaces of the flare and union before connecting them
together. This is effective for reducing gas leaks.
(3)
For proper connection, align the union tube and flare tube
straight with each other, then screw on the flare nut lightly
at first to obtain a smooth match.
Flare nut
Union
●
Adjust the shape of the liquid tube using a tube bender at the
installation site and connect it to the liquid tubing side valve
using a flare.
Cautions During Brazing
●
Replace air inside the tube with nitrogen gas to prevent
copper oxide film from forming during the brazing
process. (Oxygen, carbon dioxide and Freon are not
acceptable.)
●
Do not allow the tubing to get too hot during brazing.
The nitrogen gas inside the tubing may overheat,
causing refrigerant system valves to become damaged.
Therefore allow the tubing to cool when brazing.
●
Use a reducing valve for the nitrogen cylinder.
●
Do not use agents intended to prevent the formation
of oxide film. These agents adversely affect the
refrigerant and refrigerant oil, and may cause damage or
malfunctions.
6-2.
Connecting Tubing Between Indoor and
Outdoor Units
(1)
Tightly connect the indoor-side refrigerant tubing extended
from the wall with the outdoor-side tubing.
(2)
To fasten the flare nuts, apply specified torque.
●
When removing the flare nuts from the tubing connections,
or when tightening them after connecting the tubing, be sure
to use a torque wrench and a spanner.
Outdoor unit
Torque wrench
Spanner
Indoor unit
If the flare nuts are over-tightened, the flare may be damaged,
which could result in refrigerant leakage and cause injury or
asphyxiation to room occupants.
●
When removing or tightening the gas tube flare nut, use 2
adjustable wrenches together: one at the gas tube flare nut,
and the other at part A.
A
A
●
For the flare nuts at tubing connections, be sure to use the
flare nuts that were supplied with the unit, or else flare nuts
for R410A (type 2). The refrigerant tubing that is used must
be of the correct wall thickness as shown in the table below.
T
ube diameter
Tightening tor
que
(appr
o
x.)
T
ube thic
kness
ø6.35 (1/4")
14 – 18 N · m
{140 – 180 k
g
f · cm}
0.8 mm
ø9.52 (3/8")
34 – 42 N · m
{340 – 420 k
g
f · cm}
0.8 mm
ø12.7 (1/2")
49 – 55 N · m
{490 – 550 k
g
f · cm}
0.8 mm
ø15.88 (5/8")
68 – 82 N · m
{680 – 820 k
g
f · cm}
1.0 mm
"ECAUSETHEPRESSUREISAPPROXIMATELYTIMESHIGHERTHAN
conventional refrigerant pressure, the use of ordinary flare
nuts (type 1) or thin-walled tubes may result in tube rupture,
injury, or asphyxiation caused by refrigerant leakage.
●
In order to prevent damage to the flare caused by over-
tightening of the flare nuts, use the table above as a guide
when tightening.
●
When tightening the flare nut on the liquid tube, use a
adjustable wrench with a nominal handle length of 200 mm.
●
When tightening the flare nut with the adjustable wrench, do
not apply to the valve stem cap with the other one.
If doing so, the valve will be damaged.
Flare nut
Valve stem cap
Charging port
●
$EPENDINGONTHEINSTALLATIONCONDITIONSAPPLYINGEXCESSIVE
torque may cause the nuts to crack.
Apply refrigerant lubricant.
20
Precautions f
or P
a
c
ked
V
alve Operation
●
If the packed valve is left for a long time with the valve stem
cap removed, refrigerant will leak from the valve. Therefore,
do not leave the valve stem cap removed.
●
Use a torque wrench to securely tighten the valve stem cap.
●
Tightening
torque:
Tig
ht
ening
t
o
rque
(
a
p
p
ro
x.
)
C
h
a
rging
po
rt
n
.sM[
n
K
g
FsC
M
]
,
IQUID
SID
E
n
.sM[
n
K
g
FsC
M
]
,
IQUID
S
IDE
n
.sM[
n
K
g
FsC
M
]
ø1
2.
7,
ø1
5.
88
(
G
as
s
id
e)
n
.sM[
n
K
g
FsC
M
]
6-3. Insulating the Refrigerant Tubing
T
ubing Insulation
●
Thermal insulation must be applied to all units tubing,
including distribution joint (purchased separately).
Two tubes arranged together
Inter-unit control
wiring
Gas tube
,IQUIDTUBE
Armoring tape
Insulation
* For gas tubing, the insulation material must be heat
resistant to 120°C or above. For other tubing, it must be
heat resistant to 80°C or above.
Insulation material thickness must be 10 mm or greater.
)FTHECONDITIONSINSIDETHECEILINGEXCEED$"#AND2(
70%, increase the thickness of the gas tubing insulation
material by 1 step.
CA
UTION
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.
T
aping the flare n
uts
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.
Insulation tape (white) (supplied)
Sealer (supplied)
Flare insulator (supplied)
Tube insulator
(not supplied)
(EATRESISTANT
120°C or above
Unit side
insulator
Flare nut
Vinyl clamps (supplied)
Valv
e st
em c
ap
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.
CA
UTION
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.
6-4. Taping the Tubes
(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
overflowing the drain pan, keep the drain hose separate
from the refrigerant tubing.
(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.
(3)
Clamp the tubing bundle to the wall, using 1 clamp approx.
each meter.
Inter-unit
control wiring
Insulation
Gas tube
,IQUIDTUBE
Armoring tape
NO
TE
$ONOTWINDTHEARMORINGTAPETOOTIGHTLYSINCETHISWILL
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.
Packed valve
Charging port
Valve stem
Main valve
Valve stem cap
Refrigerant tubing
and insulator
$RAINPIPEANDINSULATOR
$RAININSULATOR
and clamp
Insulation tape
Packing clamp
Vinyl clamp
Flare insulator
Seal
The procedure used for
installing the insulator for
both gas and liquid
tubes is the same.
Small hose
band
12
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2016/12/1 9:55:15
