-
91
-
'17 • SCM-T-225
9. CONNECTING PIPING WORK
1. Preparation of connecting pipe
1.1. Selecting connecting pipe
Select connecting pipe according to the following table.
Model SRK20/25/35
Model SRK50
Gas pipe
ø9.52
ø12.7
Liquid pipe
ø6.35
ø6.35
•
Pipe wall thickness must be greater than or equal to 0.8 mm.
•
Pipe material must be O-type (Phosphorus deoxidized seamless copper pipe ICS 23.040.15, ICS 77.150.30).
1.2.
Cutting
connecting
pipe
(1)
Cut the connecting pipe to the required length with pipe cutter
.
(2)
Hold the pipe downward and remove the burrs. Make sure that no foreign material enters the pipe.
(3)
Cover the connecting pipe ends with the tape.
2.
Piping
work
2.1.
Flaring
pipe
(1)
Take
out
flare
nuts
from
the
service
valves
of
indoor
unit
and
engage
them
onto
connecting
pipes.
(2)
Flare
the
pipes
according
to
table
and
figure
shown
below
.
Flare dimensions for R410A
are dif
ferent from those for conventional refrigerant.
Alt
hough
it
is
recomm
ended
to
use
the
flaring
tools
designed
specific
ally
for
R410A
, convent
ional
flar-
ing
tools
can
also
be
used
by
adjust
ing
the
measurement
of
prot
rusion
B
wit
h
a
flare
adjust
ment
gauge.
A
Copper
pipe
outer diameter
A
0
–0.4
B
Copper
pipe
outer diameter
Rigid (clutch) type
R410A
Conventional
ø6.35
9.1
ø6.35
0-0.5
1.0-1.5
ø9.52
13.2
ø9.52
ø12.7
16.6
ø12.7
2.2
Connecting
pipes
(1) Connect pipes on both liquid and gas sides.
(2)
T
ighten
nuts
to
specified
torque
shown
in
the
table
below
.
(Do not turn)
Liquid side Gas side
Service valve size (mm)
Tightening torque (N·m)
ø6.35 (1/4")
14-18
ø9.52 (3/8")
34-42
ø12.7 (1/2")
49-61
CAUTION
•
Do
not
apply
refrigerating
machine
oil
to
the
flared
surface.
It
can
cause
refrigerant
leakage.
•
Do
not
apply
excess
torque
to
the
flared
nuts.
The
flared
nuts
may
crack
resulting
in
refrigerant
leakage.
3. Heating and condensation prevention
(1)
Dress the connecting pipes (both liquid and gas pipes) with insulation to prevent it from heating and
dew condensation.
Use
the
heat
insulating
material
which
can
withstand
120°C
or
higher
temperature.
Make
sure
that
insu
-
lation is wrapped tightly around the pipes and no gap is left between them.
(2)
W
rap the refrigerant pipings of indoor unit with indoor unit heat insulation using tape.
(3)
Cover
the
flare-connect
ed
joint
s
(indoor
side)
with
the
indoor
unit
heat
insulation
and
wrap
it
with
an
insulation pad (standard accessory provided with indoor unit).
(4)
W
rap the connecting pipes, connecting cable and drain hose with the tape.
(2)
(3)
(4)
Tape
Insulation pa
d
Position it so that the slit area faces upward.
Connecting cable
Liquid pip
e
Drain hos
e
Gas pipe
Insulation
Tape
NOTE
Locations where relative humidity exceeds 70%, both liquid and gas pipes need to be dressed with 20mm
or
thicker heat insulation materials.
CAUTION
• Improper insulation can cause condensate(water) formation during cooling operation. Condensate can leak or drip causing damage to household property
.
• Poor heat insulating capacity can cause pipe outer surface to reach high temperature during heating operation. It can cause cable deterioration and personal injury
.
4. Finishing work
Pipe assembly
Scre
w
Clam
p
(1
) Make sure that the exterior
portion of connecting
pipes, connecting cable
and drain hose is wrapped properly with tape. Shape the connecting pipes to match with the contours of the pipe assembly route.
(2)
Fix the pipe assembly with the wall using clamps and screws. Pipe assem
-
bly should be anchored every 1.5m or less to isolate the vibration.
(3)
Install the service cover securely
. W
ater may enter the unit if service cover
is not installed properly
, resulting in unit malfunction and failure.
CAUTION
Make sure that the connecting pipes do not touch the components within the unit. If pipes touch the internal components, it may generate abnormal sounds and/or vibrations.
