-
267
-
'12 • PAC-T-173
2. REFRIGERANT PIPING WORK
1)
Restrictions on unit installation and use
●
Check the following points in light of the indoor unit specifications and the installation site.
●
Observe the following restrictions on unit installation and use.
Improper installation can result in a compressor failure or per
formance degradation
.
2)
Determination of pipe size
●
Determine refrigerant pipe size pursuant to the following guidelines based on the
indoor unit specifications.
30m or less
20m or less
20m or less
L
H
H
Gas pipe
Liquid pipe
Ǿ
12.7
Ǿ
6.35
Flare
Flare
Ǿ
12.7
Ǿ
6.35
Ǿ
12.7
Ǿ
6.35
L
H
Outdoor unit
Indoor unit
CAUTION
●
The use restrictions appearing in the table above are applicable to the standard pipe size combinations shown in the table belo
w.
Where
an
exi
sti
ng pi
pe
sy
stem
is
util
iz
ed
, differ
ent
on
e-w
aypi
pe
le
ng
th
re
st
ri
cti
ons
sh
ou
ld
ap
pl
y
depending
on
its
pi
pe
si
ze
.
Fo
r
more
in
formati
on
,
pl
eas
e
se
e “5.
UTILI
ZAT
ION OF
EXISTI
NG PI
PIN
G.”
Restrictions
Dimensional restrictions
Marks appearing in the drawing on the right
Main pipe length
When the outdoor unit is positioned higher,
When the outdoor unit is positioned lower,
Elevation difference between
indoor and outdoor units
Outdoor unit connected
Refrigerant piping (branch pipeL)
Indoor unit connected
Plug the end of the pipe with tape, or other
material, and fill the pipe with nitrogen gas.
Only use nitrogen gas (N
2
)
Taping
＜
N
2
＞
Nitrogen
Brazing
Station valve
Primary side
Secondary side
0.5MPa
Hand
Relief valve
Nitrogen
gas
Brazing
must
be
performed
under
a
nitrogen
gas
flo
w
.
Without nitrogen gas, a large quantity of foreign matters (oxidizedfilm) are created,
causing a critical failure from capillary tube or expansion valve clogging.
About brazing
When pipe is brazing.
Model 40, 50, 60
Take
care
so
that
installed
pipes
may
not
touch
components
within
a
unit.
If
touching
with
an
internal
component
,
it
will
generate
abnormal
sounds
and/or
vibrations.
4) On-site piping work
IMPOR
TANT
How to remove the side cover
●
Carr
y
out
the
on
site
piping
work
with
the
operation
valve
fully
closed.
●
Give sufficient protection to a pipe end (compressed and blazed, or with an adhesive tape) so
that
water
or
foreign
matters
may
not
enter
the
piping.
●
Bend a pipe to a radius as large as practical.(R100~R150) Do not bend a pipe repeatedly to correct
its
form.
●
●
Flare
connection
is
used
between
the
unit
and
refrigerant
pipe.
Flare
a
pipe
after
engaging
a
The pipe should be anchored every 1.5m or less to isolate the vibration.
flare nut onto it. Flare dimensions for R410A are different from those for conventional R407C.
Although we recommend the use of flaring tools designed specifically for R410A, conventional
flaring tools can also be used by adjusting the measurement of protrusion B with a protrusion
control
gauge.
●
Tighten a flare joint securely with a double spanner
.
Please
remove
the
screw
of
a
side
cover
and
remove
to
the
front.
A
B
Flared
pipe
end
:
A
(mm)
Ǿ
6.35
Ǿ
12.7
Copper
pipe
outer
diameter
0
ー
0
．
4
Ａ
9
．
1
16.6
Copper
pipe
protrusion
for
flaring
:
B
(mm)
Ǿ
6.35
Ǿ
12.7
Copper
pipe
outer
diameter
In
the
case
of
a
rigid
(clutch)
type
With
an
R410A
tool
With
a
conventional
tool
0
〜
0.5
1.0
〜
1.5
CAUTION
Do
not
apply
force
beyond
proper
fastening
torque
in
tightening
the
flare
nut.
Fix both liquid and gas operation valves at the valve main bodies as illustrated on the right, and then fasten them,
applying appropriate fastening torque.
Tightening angle (
°
)
Tightening torque (N
㨯
m)
Ǿ
6.35 (1/4")
Ǿ
12.7 (1/2")
14
〜
18
49
〜
61
45
〜
60
30
〜
45
150
250
Recommended length of a tool handle (mm)
Operation valve size (mm)
Use a torque wrench. If a torque wrench is
not available, fasten the flare nut manually
first and then tighten it further, using the
left table as a guide.
Do
not hold the valve
cap area
with
a spanner
.
3)
Refrigerant
pipe
wall
thickness
and
material
●
Select
refrigerant
pipes
of
the
table
shown
on
the
right
wall
thickness
and
material
as
specified
for
each
pipe
size.
Pipe diameter [mm]
Minimum pipe wall thickness [mm]
Pipe material*
6.35
0.8
O-type pipe
12.7
0.8
O-type pipe
*Phosphorus deoxidized seamless copper pipe ICS 23.040.15, ICS 77.150.30
NOTE
●
Select
pipes
having
a
wall
thickness
larger
than
the
specified
minimum
pipe
thickness.
Side cover
The screw of the side cover
is tightened securely.
Summary of Contents for FDC Series
Page 95: ... 94 12 PAC T 173 Models FDT100VF 125VF 140VF H H H H H C B A F G D G PJF000Z285 ...
Page 98: ... 97 12 PAC T 173 Models FDEN60VF 71VF C 2 C 1 A B A B D C 1 C 2 C 1 C 2 E G F B PFA003Z817 ...
Page 113: ... 112 12 PAC T 173 b Wireless remote controller RCN E1R 60 17 150 Unit mm ...
Page 278: ... 277 12 PAC T 173 ー K ...
Page 346: ... 345 12 PAC T 173 Power PCB 1BSU OVNCFS 4GRNCEG VJG 2 ...
Page 518: ... 517 12 PAC T 173 3 5 SUPER LINK E BOARD SC ADNA E F SL2NA E and SL3N AE BE to control ...
Page 519: ... 518 12 PAC T 173 ...
