Tadiran Telecom MINI-VRF - Page 10

4.7
Oilretumbendsettings
Comectirg
io
the sec@d
stt of
itrdool
uit!
Outdoor
unit
(st)
OutdMuit(rd)
oil
Etm b6d
Com@ting
to
the list
set of
hdoorunits
Fig.
4-7 Position
of Oil
ReturnBad
Jfrc
Eeight
Direction
t
-{
-
t'ig,
4-8
position
of Oil
Return
Bend
at
the Horizontal
Direction
4.8 Remove
foreign
materials
in the
pipeline.
1)
The
foreign
n{aterials,
whicb
enter
the refrigerant
pipe
during
installation,
shall
be
cleaned
with
high
pressure nitrogen'
2)
Don't connect
with
the indoor
unit
upon
cleaning.
3)
Use
the nitogen
irstead
ofrefrigerant
or flammable
toxic
gases
like oxygen'
Air
tightness
test
l) After the
refriserant
pipe
is
installed
and connected
to. the
indoor
unit,
and before
the-co-nne-cting
''
""*-J.ai"
ift" rufi,"'.
of
the
outdoor
units,
refill
the nitrogen
with
the
pressure of
40kgflcttti
simultaneously,
mark
the
pressure
value,
and
then
perform 24-houf
afu tightxess
test.
2)
If
the
pressure
drops,
recheck
the leakage
of
all interfaces
and
then maintain
the
pressure for 24
hours
3)
Don't connect
witb
the outdoor
unit
dudng
maintaining
tbe
presswe'
oioes
between
the
indoor
and outdoor
units
are
?+.oup")
from
the
gas
side and
the
fluid
side
4.9