Two wrenches required to prevent
damaging the copper piping.
Apply Refrigerant Oil.
● Cautions
for
Piping
Connection
Work
(a) Connect
the
indoor/outdoor
connecting
pipes.
Secure
the
pipes
and
do
not
touch
other
objects,
such
as
ceilings
for
example.
(Otherwise,
abnormal
sound
may
be
heard
due
to
the
vibration
of
the
piping.)
(b) Apply
refrigerant
oil
slightly
on
the
sheet
surface
of
the
pipe
and
flar
e
nut
before
the
flarin
g
work.
Then
tighten
the
flar
e
nut
with
the
specifie
d
tightening
torque
using
two
wrenches.
Always
use
a
back-up
wrench
to
prevent
twisting
of
the
copper
piping
within
the
unit
assembly.
Perform
the
flarin
g
work
on
the
liquid
piping
side
before
the
gas
piping
side.
Check
the
gas
leakage
after
the
flarin
g
work.
NOTE:
Refrigerant
oil
is
field-supplied
[Ethereal
Oil
FVC50K,
FVC68D
(Idemitsu
Kousan
Co.
Ltd.)]
(c) When
temperature
and
humidity
inside
the
ceiling
exceed
27
o
C(80
o
F)
/RH,
relative
humidity,
80%,
apply
additional
insulation
approximately
20mm
(13/16
inch)
thickness
to
the
accessory
insulation.
It
prevents
condensation
on
the
surface
of
the
insulation
(refrigerant
pipe
only)
and
possible
damage
to
electronic
components.
(d) Perform
the
air-tight
leakage
test
4.15MPa
(601
psi)
for
the
test
pressure.
Refer
to
the
Technical
Manual
for
the
Outdoor
Unit
for
more
details.
(e) Perform
cold
insulation
work
by
insulating
and
taping
the
fla
re
connection
and
reducer
connection.
Also
insulate
all
the
refrigerant
pipes.
●
Do not apply excessive force to the flare
nut when tightening. Excessive force can
result in the flare nut cracking and refrigerant
leakage may occur. Use the specified
tightening torque.
●
For more details of the refrigerant piping
work, vacuum pumping and refrigerant
charge, refer to the Technical Manual for the
Outdoor Unit.
Required
Tightening
Torque
Pipe
Size
Tightening
Torque
6.35mm (ɸ1/4
inch)
14
to
18 N
●
m (10.3
to
13.3 ft.lbs)
9.52mm (ɸ3/8
inch)
34
to
42 N
●
m (25.1
to
31.0 ft.lbs)
12.7mm (ɸ1/2
inch)
49
to
61 N
●
m (36.1
to
45.0 ft.lbs)
15.88mm (ɸ5/8
inch)
68
to
82 N
●
m (50.2
to
60.5 ft.lbs)
19.05mm (ɸ3/4
inch) 100
to
120 N
●
m (73.8
to
88.5 ft.lbs)
12
Summary of Contents for HCHM-N04X
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