En-5
4-1. PURGING PROCEDURES AND LEAK TEST
Fig.
Fig.
2
Fig.
3
Fig.
4
Fig.
5
Fig.
6
3. FLARING WORK AND PIPE CONNECTION
3-1. FLARING WORK
Pipe
diameter
(mm)
Nut
(mm)
A
(mm)
Tightening
torque
Clutch
type
tool
for
R4
0A
Clutch
type
tool
for
R22
Wing
nut
type
tool
for
R22
N•m
kgf•cm
ø6.35
(
/4”)
7
0
to
0.5
.0
to
.5
.5
to
2.0
3.7
to
7.7
40
to
80
ø9.52
(3/8”)
22
34.3
to
4
.2 350
to
420
ø
2.7
(
/2”)
26
2.0
to
2.5
49.0
to
56.4 500
to
575
ø
5.88
(5/8”)
29
73.5
to
78.4 750
to
800
Tilted
Uneven
Burred
Good
No
good
Burr Copper
pipe
Spare
reamer
Pipe
cutter
Smooth
all
around
Even
length
all
around
Inside
is
shin-
ing
without
any
scratches.
Flare
nut
Die
Copper
pipe
Clutch
type
Flaring
tool
Wing
nut
type
3-2. PIPE CONNECTION
1) Apply a thin coat of refrigeration oil (G) to the flared ends of the pipes
and
the
pipe
connections
of
the
outdoor
unit.
Do
not
apply
refrigeration
oil
on
screw
threads.
Excessive
tightening
torque
will
result
in
damage
on
the
screw.
2)
Align
the
center
of
the
pipe
with
that
of
the
pipe
connections
of
the
out-
door unit, then hand tighten the flare nut 3 to 4 turns
3) Tighten the flare nut with a torque wrench as specified in the tabl
• Over-tightening may cause damage to the flare nut, resulting in refrig-
erant
leakage.
•
Be
sure
to
wrap
insulation
around
the
piping.
Direct
contact
with
the
bare
piping
may
result
in
burns
or
frostbite.
3-3. INSULATION AND TAPING
)
Cover
piping
joints
with
pipe
cover.
2)
For
outdoor
unit
side,
surely
insulate
every
piping
including
valves.
3)
Using
piping
tape
(E),
apply
taping
starting
from
the
entry
of
outdoor
unit.
•
Stop
the
end
of
piping
tape
(E)
with
tape
(with
adhesive
agent
at-
tached).
•
When
piping
have
to
be
arranged
through
above
ceiling,
closet
or
where
the
temperature
and
humidity
are
high,
wind
additional
commer-
cially
sold
insulation
to
prevent
condensation.
4. PURGING PROCEDURES, LEAK TEST, AND TEST RUN
Copper
pipe
)
Cut
the
copper
pipe
correctly
with
pipe
cutter.
(Fig.
,
2)
2)
Completely
remove
all
burrs
from
the
cut
cross
section
of
pipe.
(Fig.
3)
•
Aim
the
copper
pipe
downward
while
removing
burrs
to
prevent
burrs
from
dropping
in
the
pipe.
3) Remove flare nuts attached to indoor and outdoor units, then put them
on
pipe
having
completed
burr
removal.
(Not
possible
to
put
them
on
after flaring work.)
4)
Flaring
work
(Fig.
4,
5).
Firmly
hold
copper
pipe
in
the
dimension
shown
in
the
table.
Select
A
mm
from
the
table
according
to
the
tool
selected.
5)
Check
• Compare the flared work with Fig. 6
• If flare is noted to be defective, cut off the flared section and do fla -
ing
work
again.
)
Remove
service
port
cap
of
stop
valve
on
the
side
of
the
outdoor
unit
gas
pipe.
(The
stop
valves
are
fully
closed
and
covered
in
caps
in
their
initial
state.)
2)
Connect
gauge
manifold
valve
and
vacuum
pump
to
service
port
of
stop
valve
on
the
gas
pipe
side
of
the
outdoor
unit.
3)
Run
the
vacuum
pump.
(Vacuumize
for
more
than
5
minutes.)
4)
Check
the
vacuum
with
gauge
manifold
valve,
then
close
gauge
mani-
fold
valve,
and
stop
the
vacuum
pump.
5)
Leave
as
it
is
for
one
or
two
minutes.
Make
sure
the
pointer
of
gauge
manifold valve remains in the same position. Con
fi
rm that pressure
gauge
shows
-0.
0
MPa
[Gauge]
(-760
mmHg).
6)
Remove
gauge
manifold
valve
quickly
from
service
port
of
stop
valve.
7)
Fully
open
all
stop
valves
on
the
gas
pipe
and
the
liquid
pipe.
Operat-
ing
without
fully
opening
lowers
the
performance
and
this
causes
trou-
ble.
8)
Refer
to
-2.,
and
charge
the
prescribed
amount
of
refrigerant
if
needed.
Be
sure
to
charge
slowly
with
liquid
refrigerant.
Otherwise,
composition
of
the
refrigerant
in
the
system
may
be
changed
and
af-
fect
performance
of
the
air
conditioner.
9)
Tighten
cap
of
service
port
to
obtain
the
initial
status.
0
)
Leak
test
WARNING
When installing the unit, securely
connect the refrigerant pipes before
starting the compressor.
CAUTION
When there are the ports which are
not used, make sure their nuts are
tightened securely.
Service
port
cap
(Torque
3.7
to
7.7
N•m,
40
to
80
kgf•cm)
Stop
valve
for
GAS
Stop
valve
cap
(Torque
9.6
to
29.4
N•m,
200
to
300
kgf•cm)
Gauge
manifold
valve
(for
R4
0A)
Compound
pressure
gauge
(for
R4
0A)
–0.
0
MPa
(–760
mmHg)
Handle
Low
Handle
High
Vacuum
pump
(for
R4
0A)
Charge
hose
(for
R4
0A)
*Close
*Open
Hexagonal
wrench
*4
to
5
turns
Stop
valve
for
LIQUID
Pressure
gauge
(for
R4
0A)
Precautions
when
using
the
control
valve
When
attaching
the
control
valve
to
the
service
port,
valve
core
may
de-
form
or
loosen
if
excess
pressure
is
applied.
This
may
cause
gas
leak.
Service
port
Charge
hose
(for
R4
0A)
Body
Close
Open
Control
valve
A
When
attaching
the
control
valve
to
the
service
port,
make
sure
that
the
valve
core
is
in
closed
position,
and
then
tighten
part
A.
Do
not
tighten
part
A
or
turn
the
body
when
valve
core
is
in
open
position.
JG79A662H01_en.indd 5
2012/09/24 (月) 午後 7:00:11
